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Moriya H, Yokobori Y, Furukawa T, Kato T, Sato R, Takenaka A. Ovariectomy Increases Circulating Retinol-Binding Protein Concentrations Independently of Sex-Dependent Differences in Retinol Concentrations in Rats. J Nutr 2023:S0022-3166(23)25724-7. [PMID: 36870537 DOI: 10.1016/j.tjnut.2023.02.033] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2022] [Revised: 02/21/2023] [Accepted: 02/24/2023] [Indexed: 03/06/2023] Open
Abstract
BACKGROUND There is a sex-dependent difference in blood retinol and RBP concentrations, and plasma RBP is associated with insulin resistance. OBJECTIVES We aimed to clarify sex-dependent variations in body concentrations of retinol and RBPs and their association with sex hormones in rats. METHODS Plasma and liver retinol concentrations and hepatic mRNA and plasma concentrations of RBP4 were analyzed in 3- and 8-wk-old male and female Wistar rats before and after sexual maturity (experiment 1) and in orchiectomized male Wistar rats (experiment 2) and ovariectomized female Wistar rats (experiment 3). Furthermore, the mRNA and protein concentrations of RBP4 in adipose tissue were measured in ovariectomized female rats (experiment 3). RESULTS There were no sex-dependent differences in liver retinyl palmitate and retinol concentrations; however, the plasma retinol concentration was significantly higher in male rats than that in female rats after sexual maturity. Furthermore, the plasma retinol concentrations did not differ between the ovariectomized or orchiectomized rats and the control rats. Plasma Rbp4 mRNA concentrations were higher in male rats than those in female rats but not in castrated and control rats, a change consistent with plasma retinol concentration. Plasma RBP4 concentrations were also higher in male rats than those in female rats; however, unlike liver Rbp4 gene expression, plasma RBP4 concentrations were 7-fold higher in the ovariectomized rats than those in the control rats. Moreover, the Rbp4 mRNA concentrations in inguinal white adipose tissue was significantly higher in the ovariectomized rats than those in the control rats and correlated with plasma RBP4 concentrations. CONCLUSIONS Hepatic Rbp4 mRNA is higher in male rats through a sex hormone-independent mechanism, which may contribute to sex differences in blood retinol concentrations. Furthermore, ovariectomy leads to an increase in adipose tissue Rbp4 mRNA and blood RBP4 concentrations, which may contribute to insulin resistance in ovariectomized rats and postmenopausal women.
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Song S, Qiu P, Wang H, Zhang D, Qi Q, Feng L. Low preoperative serum prealbumin levels and risk of postoperative complications after transsphenoidal surgery in nonfunctioning pituitary adenoma. Neurosurg Focus 2022; 53:E6. [PMID: 36455266 DOI: 10.3171/2022.9.focus22211] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2022] [Accepted: 09/20/2022] [Indexed: 12/03/2022]
Abstract
OBJECTIVE In other specialties, malnutrition has been shown to be closely linked to postoperative complications. However, there is no research on the relationship between nutritional parameters and the complications of transsphenoidal pituitary surgery. This study was designed to identify the relationship between preoperative nutritional markers and postoperative complications in nonfunctioning pituitary adenomas. METHODS This observational study included 429 patients whose first transsphenoidal surgery was performed in Shandong Provincial Hospital between January 2015 and July 2020. Preoperative prealbumin, retinol-binding protein (RBP), the prognostic nutritional index, clinicopathological data, and postoperative complication data were collected to investigate outcomes. RESULTS After multivariable adjustment, preoperative prealbumin and RBP were inversely associated with risk of complication (p value for trend = 0.006, 0.021). The increase of preoperative serum prealbumin and RBP concentration may decrease the risk of postoperative intracranial infection and hyponatremia (both OR per SD increment, < 1; p < 0.05). The increase of preoperative prealbumin may also decrease the risk of diabetes insipidus (OR per SD increment, 0.591; p = 0.001), but similar results were not obtained for the RBP (p > 0.05). Prealbumin and RBP are both useful in predicting overall complications (area under the receiver operating characteristic curve [AUC] 0.749, 0.678), especially in intracranial infection (AUC 0.794, 0.738). However, the predictive value of prealbumin was better than that of RBP. CONCLUSIONS Low preoperative prealbumin or RBP concentrations may be associated with higher surgical risk, especially for intracranial infection. This study emphasizes the suggestion that preoperative prealbumin and RBP concentrations may be vital factors in predicting operative complications of nonfunctioning pituitary adenomas.
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Affiliation(s)
- Shuaihua Song
- 1Shandong Provincial Hospital Affiliated to Shandong First Medical University, Jinan, Shandong
| | - Peng Qiu
- 2Department of Neurosurgery, Shandong Provincial Hospital Affiliated to Shandong First Medical University, Jinan, Shandong
| | - Haoran Wang
- 3Shandong Provincial Hospital, Cheeloo College of Medicine, Shandong University, Jinan, Shandong; and
| | - Di Zhang
- 1Shandong Provincial Hospital Affiliated to Shandong First Medical University, Jinan, Shandong
| | - Qianjin Qi
- 1Shandong Provincial Hospital Affiliated to Shandong First Medical University, Jinan, Shandong
| | - Li Feng
- 4Department of Clinical Nutrition, Shandong Provincial Hospital Affiliated to Shandong First Medical University, Jinan, Shandong, China
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Lee KH, Kuczera K. Free energy simulations to study mutational effect of a conserved residue, Trp24, on stability of human serum retinol-binding protein. J Biomol Struct Dyn 2022:1-11. [PMID: 35899456 DOI: 10.1080/07391102.2022.2100829] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/16/2022]
Abstract
Human serum retinol-binding protein (RBP) is a plasma transport protein for vitamin A. RBP is a prime subclass of lipocalins, which bind nonpolar ligands within a β-barrel. To understand the role of Trp 24, one of the highly conserved residues in RBP, free energy simulations have been carried out to understand the effects of the mutations from Trp at position 24 to Leu, Phe, and Tyr in the apo-RBP on its thermal stability. We examine various unfolded systems to study the dependence of the free energy differences on the denatured structure. Our calculated free energy difference values for the three mutations are in excellent agreement with the experimental values when the initial coordinates of the seven-residue peptide segments truncated from the crystal structure are used for the denatured systems. Our free energy change differences for the Trp→Leu, Trp→Phe, and Trp→Tyr mutations are 2.50 ± 0.69, 2.58 ± 0.50, and 2.49 ± 0.48 kcal/mol, respectively, when the native-like seven-residue peptides are used as models for the denatured systems. The main contributions to the free energy change differences for the Trp24→Leu and Trp24→Phe mutations are mainly from van der Waals and covalent interactions, respectively. Electrostatic, van der Waals and covalent terms equally contribute to the free energy change difference for the Trp24→Tyr mutation. The free energy simulation helps understand the detailed microscopic mechanism of the stability of the RBP mutants relative to the wild type and the role of the highly conserved residue, Trp24, of the human RBP.Communicated by Ramaswamy H. Sarma.
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Affiliation(s)
- Kyung-Hoon Lee
- Department of Biology, Chowan University, Murfreesboro, NC, USA
| | - Krzysztof Kuczera
- Department of Chemistry and Department of Molecular Biosciences, University of Kansas, Lawrence, KS, USA
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Smirnov VM, Wilmet B, Nassisi M, Condroyer C, Antonio A, Andrieu C, Devisme C, Sancho S, Sahel JA, Zeitz C, Audo I. Large Benefit from Simple Things: High-Dose Vitamin A Improves RBP4-Related Retinal Dystrophy. Int J Mol Sci 2022; 23. [PMID: 35743034 DOI: 10.3390/ijms23126590] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2022] [Revised: 06/01/2022] [Accepted: 06/07/2022] [Indexed: 02/04/2023] Open
Abstract
Inherited retinal diseases (IRD) are a group of heterogeneous disorders, most of which lead to blindness with limited therapeutic options. Pathogenic variants in RBP4, coding for a major blood carrier of retinol, retinol-binding protein 4, are responsible for a peculiar form of IRD. The aim of this study was to investigate if retinal function of an RBP4-related IRD patient can be improved by retinol administration. Our patient presented a peculiar white-dot retinopathy, reminiscent of vitamin A deficient retinopathy. Using a customized next generation sequencing (NGS) IRD panel we discovered a novel loss-of-function homozygous pathogenic variant in RBP4: c.255G >A, p.(Trp85*). Western blotting revealed the absence of RBP4 protein in the patient’s serum. Blood retinol levels were undetectable. The patient was put on a high-dose oral retinol regimen (50,000 UI twice a week). Subjective symptoms and retinal function markedly and sustainably improved at 5-months and 1-year follow-up. Here we show that this novel IRD case can be treated by oral retinol administration.
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Fruscalzo A, Viola L, Orsaria M, Marzinotto S, Bulfoni M, Driul L, Londero AP, Mariuzzi L. STRA6 and Placental Retinoid Metabolism in Gestational Diabetes Mellitus. J Pers Med 2021; 11:1301. [PMID: 34945773 PMCID: PMC8708334 DOI: 10.3390/jpm11121301] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2021] [Revised: 11/01/2021] [Accepted: 11/25/2021] [Indexed: 11/29/2022] Open
Abstract
BACKGROUND Recent reports indicate the potential role of the stimulated by retinoic acid 6 (STRA6) protein in developing insulin resistance. The study's objective was to assess placental STRA6 expression and staining pattern in human pregnancy complicated by gestational diabetes mellitus (GDM). The expression pattern of further relevant genes involved in retinoid metabolism was also evaluated. METHODS A retrospective case-control study on paraffin-embedded placental tissue. Twenty-two human pregnancies affected by GDM, namely, 11 insulin-treated (iGDM) and 11 diet-controlled (dGDM), were compared with 22 normal-developed pregnancies (controls). An RT-PCR was performed in a random sample of 18 patients (six iGDM, six dGDM, and six controls) to assess RNA expression of STRA6 and further markers of retinoid metabolism. A semi-quantitative intensity evaluation at immunohistochemistry was performed for STRA6 in all 44 recruited patients. RESULTS STRA6 showed a decreased placental staining (9.09% vs. 68.18% positively stained samples, p < 0.05) and augmented RNA expression in dGDM patients than controls (ΔCT expression 0.473, IQR 0.403-0.566 vs. 0.149, IQR 0.092-0.276, p < 0.05). The protein staining pattern in patients affected by iGDM was comparable to controls. A reduced RNA expression of LPL, LRP1, VLDLR, and MTTP besides an augmented expression of LDLR was found in dGDM, while overexpression of LRP1 and LPL was found in iGDM patients. Unlike in the control group, significant positive correlations were found between RXRα and the proteins involved in the intracellular uptake of ROH, such as STRA6, LRP1, LRP2, and VLDLR. CONCLUSIONS An altered placental expression and staining pattern of STRA6 were found in pregnancies complicated by GDM compared to the controls. These changes were coupled to an altered expression pattern of several other genes involved in the retinoid metabolism.
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Affiliation(s)
- Arrigo Fruscalzo
- Clinic of Obstetrics and Gynecology, University Hospital of Fribourg, 1708 Fribourg, Switzerland
| | - Luigi Viola
- Clinic of Radiology, University Federico II, 80138 Naples, Italy;
| | - Maria Orsaria
- Institute of Clinical Pathology, University of Udine, 33100 Udine, Italy; (M.O.); (S.M.); (M.B.); (L.M.)
| | - Stefania Marzinotto
- Institute of Clinical Pathology, University of Udine, 33100 Udine, Italy; (M.O.); (S.M.); (M.B.); (L.M.)
| | - Michela Bulfoni
- Institute of Clinical Pathology, University of Udine, 33100 Udine, Italy; (M.O.); (S.M.); (M.B.); (L.M.)
| | - Lorenza Driul
- Clinic of Obstetrics and Gynecology, University of Udine, 33100 Udine, Italy; (L.D.); (A.P.L.)
| | - Ambrogio P. Londero
- Clinic of Obstetrics and Gynecology, University of Udine, 33100 Udine, Italy; (L.D.); (A.P.L.)
- Ennergi Research (Non-Profit Organisation), 33050 Lestizza, Italy
| | - Laura Mariuzzi
- Institute of Clinical Pathology, University of Udine, 33100 Udine, Italy; (M.O.); (S.M.); (M.B.); (L.M.)
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Young BD, Varney KM, Wilder PT, Costabile BK, Pozharski E, Cook ME, Godoy-Ruiz R, Clarke OB, Mancia F, Weber DJ. Physiologically Relevant Free Ca 2+ Ion Concentrations Regulate STRA6-Calmodulin Complex Formation via the BP2 Region of STRA6. J Mol Biol 2021; 433:167272. [PMID: 34592217 PMCID: PMC8568335 DOI: 10.1016/j.jmb.2021.167272] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2021] [Revised: 09/13/2021] [Accepted: 09/21/2021] [Indexed: 11/28/2022]
Abstract
The interaction of calmodulin (CaM) with the receptor for retinol uptake, STRA6, involves an α-helix termed BP2 that is located on the intracellular side of this homodimeric transporter (Chen et al., 2016 [1]). In the absence of Ca2+, NMR data showed that a peptide derived from BP2 bound to the C-terminal lobe (C-lobe) of Mg2+-bound CaM (MgCaM). Upon titration of Ca2+ into MgCaM-BP2, NMR chemical shift perturbations (CSPs) were observed for residues in the C-lobe, including those in the EF-hand Ca2+-binding domains, EF3 and EF4 (CaKD = 60 ± 7 nM). As higher concentrations of free Ca2+ were achieved, CSPs occurred for residues in the N-terminal lobe (N-lobe) including those in EF1 and EF2 (CaKD = 1000 ± 160 nM). Thermodynamic and kinetic Ca2+ binding studies showed that BP2 addition increased the Ca2+-binding affinity of CaM and slowed its Ca2+ dissociation rates (koff) in both the C- and N-lobe EF-hand domains, respectively. These data are consistent with BP2 binding to the C-lobe of CaM at low free Ca2+ concentrations (<100 nM) like those found at resting intracellular levels. As free Ca2+ levels approach 1000 nM, which is typical inside a cell upon an intracellular Ca2+-signaling event, BP2 is shown here to interact with both the N- and C-lobes of Ca2+-loaded CaM (CaCaM-BP2). Because this structural rearrangement observed for the CaCaM-BP2 complex occurs as intracellular free Ca2+ concentrations approach those typical of a Ca2+-signaling event (CaKD = 1000 ± 160 nM), this conformational change could be relevant to vitamin A transport by full-length CaCaM-STRA6.
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Affiliation(s)
- Brianna D Young
- The Center for Biomolecular Therapeutics (CBT), Department of Biochemistry and Molecular Biology University of Maryland School of Medicine, 108 N. Greene St, Baltimore, MD 21201, USA
| | - Kristen M Varney
- The Center for Biomolecular Therapeutics (CBT), Department of Biochemistry and Molecular Biology University of Maryland School of Medicine, 108 N. Greene St, Baltimore, MD 21201, USA; The Institute of Bioscience and Biotechnology Research (IBBR), 9600 Gudelsky Dr., Rockville, MD 20850, USA
| | - Paul T Wilder
- The Center for Biomolecular Therapeutics (CBT), Department of Biochemistry and Molecular Biology University of Maryland School of Medicine, 108 N. Greene St, Baltimore, MD 21201, USA; The Institute of Bioscience and Biotechnology Research (IBBR), 9600 Gudelsky Dr., Rockville, MD 20850, USA
| | - Brianna K Costabile
- Department of Physiology and Cellular Biophysics, Columbia University, New York, NY 10032, USA
| | - Edwin Pozharski
- The Center for Biomolecular Therapeutics (CBT), Department of Biochemistry and Molecular Biology University of Maryland School of Medicine, 108 N. Greene St, Baltimore, MD 21201, USA; The Institute of Bioscience and Biotechnology Research (IBBR), 9600 Gudelsky Dr., Rockville, MD 20850, USA
| | - Mary E Cook
- The Center for Biomolecular Therapeutics (CBT), Department of Biochemistry and Molecular Biology University of Maryland School of Medicine, 108 N. Greene St, Baltimore, MD 21201, USA
| | - Raquel Godoy-Ruiz
- The Center for Biomolecular Therapeutics (CBT), Department of Biochemistry and Molecular Biology University of Maryland School of Medicine, 108 N. Greene St, Baltimore, MD 21201, USA; The Institute of Bioscience and Biotechnology Research (IBBR), 9600 Gudelsky Dr., Rockville, MD 20850, USA
| | - Oliver B Clarke
- Department of Physiology and Cellular Biophysics, Columbia University, New York, NY 10032, USA
| | - Filippo Mancia
- Department of Physiology and Cellular Biophysics, Columbia University, New York, NY 10032, USA
| | - David J Weber
- The Center for Biomolecular Therapeutics (CBT), Department of Biochemistry and Molecular Biology University of Maryland School of Medicine, 108 N. Greene St, Baltimore, MD 21201, USA; The Institute of Bioscience and Biotechnology Research (IBBR), 9600 Gudelsky Dr., Rockville, MD 20850, USA.
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Stopková R, Otčenášková T, Matějková T, Kuntová B, Stopka P. Biological Roles of Lipocalins in Chemical Communication, Reproduction, and Regulation of Microbiota. Front Physiol 2021; 12:740006. [PMID: 34594242 PMCID: PMC8476925 DOI: 10.3389/fphys.2021.740006] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2021] [Accepted: 08/18/2021] [Indexed: 01/13/2023] Open
Abstract
Major evolutionary transitions were always accompanied by genetic remodelling of phenotypic traits. For example, the vertebrate transition from water to land was accompanied by rapid evolution of olfactory receptors and by the expansion of genes encoding lipocalins, which - due to their transporting functions - represent an important interface between the external and internal organic world of an individual and also within an individual. Similarly, some lipocalin genes were lost along other genes when this transition went in the opposite direction leading, for example, to cetaceans. In terrestrial vertebrates, lipocalins are involved in the transport of lipophilic substances, chemical signalling, odour reception, antimicrobial defence and background odour clearance during ventilation. Many ancestral lipocalins have clear physiological functions across the vertebrate taxa while many other have - due to pleiotropic effects of their genes - multiple or complementary functions within the body homeostasis and development. The aim of this review is to deconstruct the physiological functions of lipocalins in light of current OMICs techniques. We concentrated on major findings in the house mouse in comparison to other model taxa (e.g., voles, humans, and birds) in which all or most coding genes within their genomes were repeatedly sequenced and their annotations are sufficiently informative.
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Affiliation(s)
- Romana Stopková
- Department of Zoology, Faculty of Science, Charles University, BIOCEV, Prague, Czechia
| | - Tereza Otčenášková
- Department of Zoology, Faculty of Science, Charles University, BIOCEV, Prague, Czechia
| | - Tereza Matějková
- Department of Zoology, Faculty of Science, Charles University, BIOCEV, Prague, Czechia
| | - Barbora Kuntová
- Department of Zoology, Faculty of Science, Charles University, BIOCEV, Prague, Czechia
| | - Pavel Stopka
- Department of Zoology, Faculty of Science, Charles University, BIOCEV, Prague, Czechia
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Laarman AH, Watts JS, Foroudi F, Rezamand P. Low dietary protein increases vitamin A absorption and deposition into milk in periparturient rats. INT J VITAM NUTR RES 2021:1-7. [PMID: 34013777 DOI: 10.1024/0300-9831/a000712] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
Our objective was to study the effect of differing dietary crude protein and vitamin A on retinoid metabolism in a periparturient rat model. Sixty female rats, approximately 21 d before parturition, were fed rations containing either low protein (13%; LP) or high protein (22%; HP) crude protein and either low vitamin A (3 IU/g; LA) or high vitamin A (5 IU/g; HA), yielding treatments HPHA, HPLA, LPHA, and LPLA. Samples were collected at d -14, d +3, and +10 relative to parturition and analyzed for all-trans retinoid acid (RA), 13-Cis RA, and retinol. At d -14, serum all-trans RA concentrations decreased compared to baseline. At both d +3 and d +10, serum retinol increased and liver 13-Cis RA decreased. In the small intestine, 13-cis RA was higher in HPHA than HPLA pre-partum (0.93±0.12 vs. 0.40±0.12 ng/ml, P=0.04). Post-partum, 13-cis RA was lower in high vitamin HPHA and LPHA groups (0.35±0.06 and 0.38±0.06 ng/ml) than in low vitamin A HPLA and LPLA treatments (0.50±0.06 and 1.32±0.06 ng/ml, P<0.01). In rats fed LA diets, TNF-alpha expression tended to be lower in HPLA than LPLA groups on day +3 (0.69±0.34 vs 1.00±0.52, P=0.08), but not day +10 (0.56±0.25 vs. 1.00±0.49 Fold Change, P>0.10). Retinoids accumulated during pregnancy and were mobilized during lactation. The sequestration of retinoids was increased when dietary protein content was low. Further studies are needed to investigate how retinoid metabolism could be manipulated to improve vitamin A delivery to milk.
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Affiliation(s)
- Anne H Laarman
- Department of Animal and Veterinary Science, University of Idaho, Moscow, Idaho, USA.,Department of Agricultural, Food and Nutritional Science, University of Alberta, Edmonton, Alberta, Canada
| | - Jason S Watts
- Department of Animal and Veterinary Science, University of Idaho, Moscow, Idaho, USA
| | - Farhad Foroudi
- Department of Animal Sciences, Islamic Azad University, Varamin Pishva Branch, Varamin, Iran
| | - Pedram Rezamand
- Department of Animal and Veterinary Science, University of Idaho, Moscow, Idaho, USA
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Honarbakhsh M, Ericsson A, Zhong G, Isoherranen N, Zhu C, Bromberg Y, Van Buiten C, Malta K, Joseph L, Sampath H, Lackey AI, Storch J, Vetriani C, Chikindas ML, Breslin P, Quadro L. Impact of vitamin A transport and storage on intestinal retinoid homeostasis and functions. J Lipid Res 2021; 62:100046. [PMID: 33587919 PMCID: PMC8020483 DOI: 10.1016/j.jlr.2021.100046] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/23/2020] [Revised: 01/15/2021] [Accepted: 01/29/2021] [Indexed: 12/15/2022] Open
Abstract
Lecithin:retinol acyltransferase and retinol-binding protein enable vitamin A (VA) storage and transport, respectively, maintaining tissue homeostasis of retinoids (VA derivatives). The precarious VA status of the lecithin:retinol acyltransferase-deficient (Lrat-/-) retinol-binding protein-deficient (Rbp-/-) mice rapidly deteriorates upon dietary VA restriction, leading to signs of severe vitamin A deficiency (VAD). As retinoids impact gut morphology and functions, VAD is often linked to intestinal pathological conditions and microbial dysbiosis. Thus, we investigated the contribution of VA storage and transport to intestinal retinoid homeostasis and functionalities. We showed the occurrence of intestinal VAD in Lrat-/-Rbp-/- mice, demonstrating the critical role of both pathways in preserving gut retinoid homeostasis. Moreover, in the mutant colon, VAD resulted in a compromised intestinal barrier as manifested by reduced mucins and antimicrobial defense, leaky gut, increased inflammation and oxidative stress, and altered mucosal immunocytokine profiles. These perturbations were accompanied by fecal dysbiosis, revealing that the VA status (sufficient vs. deficient), rather than the amount of dietary VA per se, is likely a major initial discriminant of the intestinal microbiome. Our data also pointed to a specific fecal taxonomic profile and distinct microbial functionalities associated with VAD. Overall, our findings revealed the suitability of the Lrat-/-Rbp-/- mice as a model to study intestinal dysfunctions and dysbiosis promoted by changes in tissue retinoid homeostasis induced by the host VA status and/or intake.
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Affiliation(s)
| | - Aaron Ericsson
- Department of Veterinary Pathobiology, University of Missouri Metagenomics Center, University of Missouri, Columbia, MO, USA
| | - Guo Zhong
- Department of Pharmaceutics Health Sciences, University of Washington, Seattle, WA, USA
| | - Nina Isoherranen
- Department of Pharmaceutics Health Sciences, University of Washington, Seattle, WA, USA
| | - Chengsheng Zhu
- Department of Biochemistry and Microbiology, Rutgers University, New Brunswick, NJ, USA
| | - Yana Bromberg
- Department of Biochemistry and Microbiology, Rutgers University, New Brunswick, NJ, USA
| | - Charlene Van Buiten
- Department of Food Science and Human Nutrition, Colorado State University, Fort Collins, CO, USA
| | - Kiana Malta
- Department of Food Science, Rutgers University, New Brunswick, NJ, USA
| | - Laurie Joseph
- Department of Pharmacology and Toxicology, Rutgers University, Piscataway, NJ, USA
| | - Harini Sampath
- Department of Nutritional Sciences, Rutgers University, New Brunswick, NJ, USA; Rutgers Center for Lipid Research and Institute of Food Nutrition and Health, Rutgers University, New Brunswick, NJ, USA
| | - Atreju I Lackey
- Department of Nutritional Sciences, Rutgers University, New Brunswick, NJ, USA
| | - Judith Storch
- Department of Nutritional Sciences, Rutgers University, New Brunswick, NJ, USA; Rutgers Center for Lipid Research and Institute of Food Nutrition and Health, Rutgers University, New Brunswick, NJ, USA
| | - Costantino Vetriani
- Department of Biochemistry and Microbiology, Rutgers University, New Brunswick, NJ, USA
| | | | - Paul Breslin
- Department of Nutritional Sciences, Rutgers University, New Brunswick, NJ, USA
| | - Loredana Quadro
- Department of Food Science, Rutgers University, New Brunswick, NJ, USA; Rutgers Center for Lipid Research and Institute of Food Nutrition and Health, Rutgers University, New Brunswick, NJ, USA.
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Welles JE, Toro AL, Sunilkumar S, Stevens SA, Purnell CJ, Kimball SR, Dennis MD. Retinol-binding protein 4 mRNA translation in hepatocytes is enhanced by activation of mTORC1. Am J Physiol Endocrinol Metab 2021; 320:E306-E315. [PMID: 33284085 PMCID: PMC8260359 DOI: 10.1152/ajpendo.00494.2020] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
Increased expression of the peptide hormone retinol-binding protein 4 (RBP4) has been implicated in the development of insulin resistance, type 2 diabetes, and visual dysfunction. Prior investigations of the mechanisms that influence RBP4 synthesis have focused solely on changes in mRNA abundance. Yet, the production of many secreted proteins is controlled at the level of mRNA translation, as it allows for a rapid and reversible change in expression. Herein, we evaluated Rbp4 mRNA translation using sucrose density gradient centrifugation. In the liver of fasted rodents, Rbp4 mRNA translation was low. In response to refeeding, Rbp4 mRNA translation was enhanced and RBP4 levels in serum were increased. In H4IIE cells, refreshing culture medium promoted Rbp4 mRNA translation and expression of the protein. Rbp4 mRNA abundance was not increased by either experimental manipulation. Enhanced Rbp4 mRNA translation was associated with activation of the kinase mechanistic target of rapamycin in complex 1 (mTORC1) and enhanced phosphorylation of the translational repressor eukaryotic initiation factor 4E-binding protein 1 (4E-BP1). In H4IIE cells, expression of a 4E-BP1 variant that is unable to be phosphorylated by mTORC1 or suppression of mTORC1 with rapamycin attenuated activity of a luciferase reporter encoding the Rbp4 mRNA 5'-untranslated region (UTR). Purine substitutions to disrupt a terminal oligopyrimidine (TOP)-like sequence in the Rbp4 5'-UTR prevented the suppressive effect of rapamycin on reporter activity. Rapamycin also prevented upregulation of Rbp4 mRNA translation in the liver and reduced serum levels of RBP4 in response to feeding. Overall, the findings support a model in which nutrient-induced activation of mTORC1 upregulates Rbp4 mRNA translation to promote RBP4 synthesis.NEW & NOTEWORTHY RBP4 plays a critical role in metabolic disease, yet relatively little is known about the mechanisms that regulate its production. Herein, we provide evidence for translational control of RBP4 synthesis. We demonstrate that activation of the nutrient-sensitive kinase mTORC1 promotes hepatic Rbp4 mRNA translation. The findings support the possibility that targeting Rbp4 mRNA translation represents an alternative to current therapeutic interventions that lower serum RBP4 concentration by promoting urinary excretion of the protein.
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Affiliation(s)
- Jaclyn E Welles
- Department of Cellular and Molecular Physiology, Penn State College of Medicine, Hershey, Pennsylvania
| | - Allyson L Toro
- Department of Cellular and Molecular Physiology, Penn State College of Medicine, Hershey, Pennsylvania
| | - Siddharth Sunilkumar
- Department of Cellular and Molecular Physiology, Penn State College of Medicine, Hershey, Pennsylvania
| | - Shaunaci A Stevens
- Department of Cellular and Molecular Physiology, Penn State College of Medicine, Hershey, Pennsylvania
| | - Carson J Purnell
- Department of Cellular and Molecular Physiology, Penn State College of Medicine, Hershey, Pennsylvania
| | - Scot R Kimball
- Department of Cellular and Molecular Physiology, Penn State College of Medicine, Hershey, Pennsylvania
| | - Michael D Dennis
- Department of Cellular and Molecular Physiology, Penn State College of Medicine, Hershey, Pennsylvania
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11
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Whitehead RD, Ford ND, Mapango C, Ruth LJ, Zhang M, Schleicher RL, Ngalombi S, Halati S, Ahimbisibwe M, Lubowa A, Sheftel J, Tanumihardjo SA, Jefferds MED. Retinol-binding protein, retinol, and modified-relative-dose response in Ugandan children aged 12-23 months and their non-pregnant caregivers. Exp Biol Med (Maywood) 2021; 246:906-915. [PMID: 33467913 DOI: 10.1177/1535370220985473] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022] Open
Abstract
Retinol-binding protein (RBP), retinol, and modified-relative-dose response (MRDR) are used to assess vitamin A status. We describe vitamin A status in Ugandan children and women using dried blood spot (DBS) RBP, serum RBP, plasma retinol, and MRDR and compare DBS-RBP, serum RBP, and plasma retinol. Blood was collected from 39 children aged 12-23 months and 28 non-pregnant mothers aged 15-49 years as a subsample from a survey in Amuria district, Uganda, in 2016. DBS RBP was assessed using a commercial enzyme immunoassay kit, serum RBP using an in-house sandwich enzyme-linked immunosorbent assay, and plasma retinol/MRDR test using high-performance liquid chromatography. We examined (a) median concentration or value (Q1, Q3); (b) R2 between DBS-RBP, serum RBP, and plasma retinol; and (c) Bland-Altman plots. Median (Q1, Q3) for children and mothers, respectively, were as follows: DBS-RBP 1.15 µmol/L (0.97, 1.42) and 1.73 (1.52, 1.96), serum RBP 0.95 µmol/L (0.78, 1.18) and 1.47 µmol/L (1.30, 1.79), plasma retinol 0.82 µmol/L (0.67, 0.99) and 1.33 µmol/L (1.22, 1.58), and MRDR 0.025 (0.014, 0.042) and 0.014 (0.009, 0.019). DBS RBP-serum RBP R2 was 0.09 for both children and mothers. The mean biases were -0.19 µmol/L (95% limits of agreement [LOA] 0.62, -0.99) for children and -0.01 µmol/L (95% LOA -1.11, -1.31) for mothers. DBS RBP-plasma retinol R2 was 0.11 for children and 0.13 for mothers. Mean biases were 0.33 µmol/L (95% LOA -0.37, 1.03) for children, and 0.29 µmol/L (95% LOA -0.69, 1.27) for mothers. Serum RBP-plasma retinol R2 was 0.75 for children and 0.55 for mothers, with mean biases of 0.13 µmol/L (95% LOA -0.23, 0.49) for children and 0.18 µmol/L (95% LOA -0.61, 0.96) for mothers. Results varied by indicator and matrix. The serum RBP-retinol R2 for children was moderate (0.75), but poor for other comparisons. Understanding the relationships among vitamin A indicators across contexts and population groups is needed.
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Affiliation(s)
- Ralph D Whitehead
- Division of Nutrition, Physical Activity, and Obesity, National Center for Chronic Disease Prevention and Health Promotion, 1242Centers for Disease Control and Prevention, Atlanta, GA 30341, USA
| | - Nicole D Ford
- McKing Consulting Corporation, Atlanta, GA 30341, USA
| | - Carine Mapango
- Division of Laboratory Sciences, National Center for Environmental Health, Centers for Disease Control and Prevention, Atlanta, GA 30341, USA
| | - Laird J Ruth
- McKing Consulting Corporation, Atlanta, GA 30341, USA
| | - Ming Zhang
- Division of Laboratory Sciences, National Center for Environmental Health, Centers for Disease Control and Prevention, Atlanta, GA 30341, USA
| | - Rosemary L Schleicher
- Division of Laboratory Sciences, National Center for Environmental Health, Centers for Disease Control and Prevention, Atlanta, GA 30341, USA
| | | | - Siti Halati
- World Food Programme, Kampala, 10101, Uganda
| | | | - Abdelrahman Lubowa
- School of Food Technology, Nutrition and Bioengineering, Makerere University, Kampala, 10101, Uganda
| | - Jesse Sheftel
- Department of Nutritional Sciences, University of Wisconsin-Madison, Madison, WI 53706, USA
| | - Sherry A Tanumihardjo
- Department of Nutritional Sciences, University of Wisconsin-Madison, Madison, WI 53706, USA
| | - Maria Elena D Jefferds
- Division of Nutrition, Physical Activity, and Obesity, National Center for Chronic Disease Prevention and Health Promotion, 1242Centers for Disease Control and Prevention, Atlanta, GA 30341, USA
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12
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Green MH, Ford JL, Green JB. Development of a Compartmental Model to Investigate the Influence of Inflammation on Predictions of Vitamin A Total Body Stores by Retinol Isotope Dilution in Theoretical Humans. J Nutr 2021; 151:731-741. [PMID: 33484140 PMCID: PMC7948205 DOI: 10.1093/jn/nxaa407] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2020] [Revised: 10/13/2020] [Accepted: 11/23/2020] [Indexed: 12/30/2022] Open
Abstract
BACKGROUND Inflammation, both acute and chronic, is associated with reductions in the synthesis of retinol-binding protein (RBP) and the concentration of retinol in plasma. Consequently, it is currently recommended that the retinol isotope dilution (RID) method not be used to estimate vitamin A total body stores (TBS) in subjects with inflammation. OBJECTIVES To apply compartmental analysis to study the effects of inflammation on hepatic apo-RBP input, plasma retinol pool size, and RID-predicted TBS in theoretical subjects with known steady state values for these parameters. METHODS We selected 6 previously generated hypothetical subjects who ingested a dose of stable isotope-labeled vitamin A (day 0). Starting with each subject's published steady state model for retinol tracer kinetics, we developed a parallel model for unlabeled retinol and RBP that incorporated links between these entities and tied liver retinol secretion to RBP availability. Then we perturbed the steady state model by initiating chronic or acute inflammation on day 0 or acute inflammation on day 3 or 9 and simulating results for RBP, plasma retinol, and TBS. RESULTS Chronic inflammation led to substantial reductions in RID-predicted TBS for at least 2 weeks after tracer administration. In contrast, acute inflammation induced on day 0 or 3 resulted in less dramatic impacts on TBS (37% or 20% reduction, respectively, from steady state levels, with levels rebounding by 14 days). When inflammation was induced 9 days after administration of the tracer, the effects on predicted TBS were minimal. Overall, for acute inflammation initiated at 0, 3, or 9 days, accurate predictions of TBS were obtained by 2 weeks. CONCLUSIONS Compartmental analysis can be applied in the novel way described here to study the influence of perturbations such as inflammation on predictions of vitamin A status using RID. Such an approach has potential value for studying other perturbations and different nutrients.
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Affiliation(s)
| | - Jennifer Lynn Ford
- Department of Nutritional Sciences, College of Health and Human Development, The Pennsylvania State University, University Park, PA, USA
| | - Joanne Balmer Green
- Department of Nutritional Sciences, College of Health and Human Development, The Pennsylvania State University, University Park, PA, USA
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13
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Li C, Kong W, Kang L, Zhang T, Zhang W, Wang W. Study on the correlation between urinary retinol-binding protein and nonalcoholic fatty liver disease. J Med Biochem 2021; 40:86-91. [PMID: 33584144 PMCID: PMC7857848 DOI: 10.5937/jomb0-24666] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2019] [Accepted: 02/22/2020] [Indexed: 11/23/2022] Open
Abstract
Background Nonalcoholic fatty liver disease (NAFLD) affects human health worldwide. Our objective was to explore the correlation between urinary retinol-binding protein (URBP) and NAFLD. Methods This cross-sectional study included 445 NAFLD patients and 911 healthy controls. The URBP level and other parameters were measured. Results The URBP level (expressed by the RBP/creatinine ratio) was higher in the NAFLD patients compared with the non-NAFLD patients. The urinary RBP/creatinine ratio was an independent risk factor for NAFLD after univariate and multivariate regression analysis, with the or values of 2.271 (1.795-2.872, P < 0.001) and 2.338 (1.775-3.080, P < 0.001), respectively. The prevalence of the urinary RBP/creatinine ratio (groups 1, 2, 3, 4) was 20.0%, 17.3%, 27.3%, and 35.4%, respectively (P < 0.001), and the prevalence of NAFLD in the high urinary RBP/creatinine ratio group was significantly higher than that in the low urinary RBP/creatinine ratio group. Conclusions Our results revealed that the urinary RBP/creatinine ratio was an independent risk factor for NAFLD.
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Affiliation(s)
- Chuang Li
- Xinxiang Medical University, The Third Affiliated Hospital, Department of Laboratory Medicine, Xinxiang, Henan, China
| | - Weiwei Kong
- Xinxiang Medical University, The Third Affiliated Hospital, Department of Laboratory Medicine, Xinxiang, Henan, China
| | - Lixia Kang
- Xinxiang Medical University, The Third Affiliated Hospital, Department of Laboratory Medicine, Xinxiang, Henan, China
| | - Tiehan Zhang
- Xinxiang Medical University, The Third Affiliated Hospital, Department of Laboratory Medicine, Xinxiang, Henan, China
| | - Weiqun Zhang
- Xinxiang Medical University, The Third Affiliated Hospital, Department of Laboratory Medicine, Xinxiang, Henan, China
| | - Weidong Wang
- Xinxiang Medical University, The Third Affiliated Hospital, Department of Laboratory Medicine, Xinxiang, Henan, China
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14
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Blakeley M, Sobczyńska-Malefora A, Carpenter G. The Origins of Salivary Vitamin A, Vitamin B 12 and Vitamin D-Binding Proteins. Nutrients 2020; 12:E3838. [PMID: 33339130 DOI: 10.3390/nu12123838] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2020] [Revised: 12/09/2020] [Accepted: 12/11/2020] [Indexed: 11/16/2022] Open
Abstract
Vitamin A- (retinol), vitamin B12- (haptocorrin) and vitamin D-binding proteins are the major circulatory transporters of their respective ligands; they are also constituents of the salivary proteome, the origins of which, remain unclear. The aim of this study was to explore how these proteins enter saliva and their relationship (if any) with vitamin status. Firstly, the three vitamin-binding proteins were quantified in resting whole mouth saliva and chewing-stimulated saliva from healthy donors (n = 10) to determine if they enter the mouth by salivary secretion or from the circulation. Secondly paired whole mouth saliva and serum samples were analysed from healthy donors (n = 14) to determine the relationships between the vitamin-binding proteins and vitamin status. Salivary output of all three vitamin-binding proteins studied increased when secretion was stimulated, suggesting they are secreted by the salivary glands. Whilst retinol-binding protein and haptocorrin were secreted by all major salivary glands, vitamin D-binding protein was restricted to the mucus glands. Salivary vitamin-binding protein concentrations were not found to be indicative of systemic vitamin status.
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15
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Kuvibidila SR, Gardner R, Velez MC, Yu L, Warrier RP. In Vitro Lymphocyte Functions in Undernourished Children With Sickle Cell Anemia. Ochsner J 2020; 20:151-60. [PMID: 32612469 DOI: 10.31486/toj.19.0024] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022] Open
Abstract
Background: Children with sickle cell disease (SCD) often suffer from growth deficits and impaired immunity. However, the association between mild to moderate malnutrition and in vitro lymphocyte function has not been well studied. The goal of this study was to investigate the effects of undernutrition on lymphocyte functions in children with SCD. Methods: Weight; height; plasma concentrations of albumin (Alb), prealbumin (PA), transferrin (Tf), retinol-binding protein (RBP), α1-acid glycoprotein (AGP), C-reactive protein (CRP), and ceruloplasmin (Cp); and lymphocyte proliferation and interleukin (IL)-2 in phytohemagglutinin-treated blood lymphocytes were measured in 90 children with SCD (59 SS, 4 Sβ°, 27 SC hemoglobin genotypes). Results: The mean age of the children included in the analysis was 7.65 years. Four of the 90 children had weight and height below the fifth percentile. A higher percentage of children with HbSS/HbSβ° (61.4%) than of those with HbSC (44%) had ≥2 plasma protein concentrations below normal (Alb <35 g/L, PA <160 mg/L, Tf <2.0 g/L, and RBP ≤20 mg/L). Mean anthropometric measurements, hemoglobin, and hematocrit were lower in children with HbSS/HbSβ° than in those with HbSC (P<0.05). Lymphocyte proliferation was reduced by 20% to 27% in children with HbSS/HbSβ° with undernutrition plus inflammation (AGP >1 g/L, CRP >5 mg/L, Cp >600 mg/L) compared to children with neither. Regardless of inflammatory status, lymphocyte proliferation was reduced by 29% to 49% in children with HbSS/HbSβ° and undernutrition defined by PA or Alb plus RBP (P<0.05) compared to those with RBP within normal range. Neither undernutrition nor inflammation reduced lymphocyte proliferation in children with HbSC. Mean IL-2 activity was reduced by undernutrition, defined as PA <160 mg/L, in both groups. PA, RBP, and hemoglobin concentrations positively correlated with in vitro lymphocyte functions (P<0.05). Conclusion: Undernutrition altered in vitro lymphocyte function in children with the HbSS/HbSβ° genotypes. Dietary supplements may improve the altered functions in these children.
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16
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Siddiqui K, Joy SS, George TP, Mujammami M, Alfadda AA. Potential Role and Excretion Level of Urinary Transferrin, KIM-1, RBP, MCP-1 and NGAL Markers in Diabetic Nephropathy. Diabetes Metab Syndr Obes 2020; 13:5103-5111. [PMID: 33408494 PMCID: PMC7780984 DOI: 10.2147/dmso.s282166] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/15/2020] [Accepted: 11/13/2020] [Indexed: 01/10/2023] Open
Abstract
BACKGROUND Analyzing urinary biomarkers may provide better insight into pathophysiological mechanisms of diabetic kidney diseases. The study aimed to analyze the pattern of selected excreted urinary biomarkers and its correlation with albuminuria and estimated glomerular filtration rate (eGFR) in patients with type 2 diabetes. METHODS A total of 185 patients with type 2 diabetes were categorized according to KDIGO guideline based on albuminuria and eGFR. The urinary markers (transferrin, KIM-1, RBP, MCP-1 and NGAL) were measured by ELISA. RESULTS The urinary markers were associated with eGFR (total protein/Cr, p=0.001; RBP/Cr, p=0.007; MCP-1/Cr, p=0.023; NGAL/Cr, p=0.011) and albuminuria (total protein/Cr, p<0.001; transferrin, p<0.001; RBP/Cr, p<0.001; MCP-1/Cr, p<0.001; NGAL/Cr, p=0.002). CONCLUSION The urinary marker levels (total protein, RBP, MCP-1, and NGAL) are elevated with severity of kidney damage and expressed more in progressive renal impairment.
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Affiliation(s)
- Khalid Siddiqui
- Strategic Center for Diabetes Research, College of Medicine, King Saud University, Riyadh, Saudi Arabia
- Correspondence: Khalid Siddiqui Strategic Center for Diabetes Research, College of Medicine, King Saud University, P.O. Box 245, Riyadh11411, Kingdom of Saudi ArabiaTel +966 114724179 ext.1340 Email
| | - Salini Scaria Joy
- Strategic Center for Diabetes Research, College of Medicine, King Saud University, Riyadh, Saudi Arabia
| | | | - Muhammad Mujammami
- Strategic Center for Diabetes Research, College of Medicine, King Saud University, Riyadh, Saudi Arabia
- University Diabetes Center, King Saud University Medical City, King Saud University, Riyadh, Saudi Arabia
- Department of Medicine, College of Medicine, and King Saud University Medical City, King Saud University, Riyadh, Saudi Arabia
| | - Assim A Alfadda
- Strategic Center for Diabetes Research, College of Medicine, King Saud University, Riyadh, Saudi Arabia
- Department of Medicine, College of Medicine, and King Saud University Medical City, King Saud University, Riyadh, Saudi Arabia
- Obesity Research Center, College of Medicine, King Saud University, Riyadh, Saudi Arabia
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17
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Borodkina DA, Gruzdeva OV, Belik EV, Palicheva EI, Kuzmina AA. [The perspectives of application of retinol-binding protein as a biomarker of risk of cardiovascular pathology.]. Klin Lab Diagn 2019; 63:79-84. [PMID: 30672670 DOI: 10.18821/0869-2084-2018-63-2-79-84] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2017] [Accepted: 11/01/2017] [Indexed: 11/17/2022]
Abstract
The fatty tissue is an endocrine organ secreting biologically active factors called adipokines that have systemic and local features. The adipokines play an important role in development of complications caused by obesity. nowadays, retinol-binding protein 4 (RBP4), one of adipokines identified recently, is considered as a connecting link between obesity and its complications. Adipokine participates in development of resistance to insulin and correlated with cardio-metabolic markers at chronic inflammatory diseases, including diabetes mellitus type II, metabolic syndrome and cardio-vascular diseases. It is considered that inflammation, produced by RBP4, induces resistance to insulin and cardio-vascular diseases. It seems that RBP4 is an adipokine that both induces resistance to insulin and participates in pathogenesis of other metabolic complications of obesity. This is confirmed by a tight relationship between RBP4 and atherogenic lipoproteins, atherosclerotic affection of vessels and cardio-vascular diseases. However, an important restriction in certain studies related to RBP4 is that they included patients who received medicinal therapy (sugar lowering and hypo-lipidemic pharmaceuticals) or had renal and hepatic insufficiency. The mentioned factors impact concentration of RBP4 in blood and hence can distort the results. In spite of that, the established potential metabolic role of RBP4 requires a further investigation. Besides further carefully planned studies are required focusing on establishing is RBP4 a molecular participator of molecular alterations or it is only a dynamically volatile "witness". The present review summarizes actual knowledge concerning the role of RBP4 under obesity, in development of dyslipidemia, insulin resistance and cardio-vascular diseases. The purpose of the study is to summarize data of studying of inflammatory and immune effects of RBP4 especially in case of cardio-vascular diseases and also establishment of perspective of applying retinol-binding protein as a potential biomarker of cardiovascular risk.
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Affiliation(s)
- D A Borodkina
- The Federal State Budget Scientific Institution "The research institute of complex problems of cardio-vascular diseases", 650002, Kemerovo, Russia.,The State Autonomous Health Care Institution of Kemerovo Oblast "The S.V. beliaev Kemerovo oblast clinical hospital", "The Oblast Diabetology Center", 650066, Kemerovo, Russia
| | - O V Gruzdeva
- The Federal State Budget Scientific Institution "The research institute of complex problems of cardio-vascular diseases", 650002, Kemerovo, Russia.,The Federal State Budget Educational Institution of Higher Education "The Kemerovo State Medical University" of Minzdrav of Russia, 650029, Kemerovo, Russia
| | - E V Belik
- The Federal State Budget Scientific Institution "The research institute of complex problems of cardio-vascular diseases", 650002, Kemerovo, Russia
| | - E I Palicheva
- The Federal State Budget Scientific Institution "The research institute of complex problems of cardio-vascular diseases", 650002, Kemerovo, Russia.,The Federal State Budget Educational Institution of Higher Education "The Kemerovo State Medical University" of Minzdrav of Russia, 650029, Kemerovo, Russia
| | - A A Kuzmina
- The Federal State Budget Scientific Institution "The research institute of complex problems of cardio-vascular diseases", 650002, Kemerovo, Russia
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18
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Huda MN, Ahmad SM, Kalanetra KM, Taft DH, Alam MJ, Khanam A, Raqib R, Underwood MA, Mills DA, Stephensen CB. Neonatal Vitamin A Supplementation and Vitamin A Status Are Associated with Gut Microbiome Composition in Bangladeshi Infants in Early Infancy and at 2 Years of Age. J Nutr 2019; 149:1075-1088. [PMID: 31006815 PMCID: PMC6543205 DOI: 10.1093/jn/nxz034] [Citation(s) in RCA: 34] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2018] [Revised: 11/14/2018] [Accepted: 02/14/2019] [Indexed: 01/23/2023] Open
Abstract
BACKGROUND Infancy is a crucial period for establishing the intestinal microbiome. This process may be influenced by vitamin A (VA) status because VA affects intestinal immunity and epithelial integrity, factors that can, in turn, modulate microbiome development. OBJECTIVES The aim of this study was to determine if neonatal VA supplementation (VAS) affected the abundance of Bifidobacterium, a beneficial commensal, or of Proteobacteria, a phylum containing enteric pathogens, in early (6-15 wk) or late (2 y) infancy. Secondary objectives were to determine if VAS affected the abundance of other bacterial taxa, and to determine if VA status assessed by measuring plasma retinol was associated with bacterial abundance. METHODS Three hundred and six Bangladeshi infants were randomized by sex and birthweight status (above/below median) to receive 1 VA dose (50,000 IU) or placebo within 48 h of birth. Relative abundance at the genus level and above was assessed by 16S rRNA gene sequencing. A terminal restriction fragment-length polymorphism assay was used to identify Bifidobacterium species and subspecies at 6 wk. RESULTS Linear regression showed that Bifidobacterium abundance in early infancy was lower in boys (median, 1st/3rd quartiles; 0.67, 0.52/0.78) than girls (0.73, 0.60/0.80; P = 0.003) but that boys receiving VAS (0.69, 0.55/0.78) had higher abundance than boys receiving placebo (0.65, 0.44/0.77; P = 0.039). However this difference was not seen in girls (VAS 0.71, 0.54/0.80; placebo 0.75, 0.63/0.81; P = 0.25). VAS did not affect Proteobacteria abundance. Sex-specific associations were also seen for VA status, including positive associations of plasma retinol with Actinobacteria (the phylum containing Bifidobacterium) and Akkermansia, another commensal with possible health benefits, for girls in late infancy. CONCLUSIONS Better VA status in infancy may influence health both in infancy and later in life by promoting the establishment of a healthy microbiota. This postulated effect of VA may differ between boys and girls. This trial was registered at clinicaltrials.gov as NCT02027610.
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Affiliation(s)
- M Nazmul Huda
- Nutrition Department
- Immunobiology, Nutrition and Toxicology Laboratory, Infectious Diseases Division, icddr,b, Dhaka, Bangladesh
- US Department of Agriculture, Western Human Nutrition Research Center, Davis, CA
| | - Shaikh M Ahmad
- Immunobiology, Nutrition and Toxicology Laboratory, Infectious Diseases Division, icddr,b, Dhaka, Bangladesh
| | | | | | - Md J Alam
- Immunobiology, Nutrition and Toxicology Laboratory, Infectious Diseases Division, icddr,b, Dhaka, Bangladesh
| | - Afsana Khanam
- Immunobiology, Nutrition and Toxicology Laboratory, Infectious Diseases Division, icddr,b, Dhaka, Bangladesh
| | - Rubhana Raqib
- Immunobiology, Nutrition and Toxicology Laboratory, Infectious Diseases Division, icddr,b, Dhaka, Bangladesh
| | - Mark A Underwood
- Department of Pediatrics, University of California, Davis, Sacramento, CA
| | - David A Mills
- Department of Food Science and Technology
- Department of Viticulture and Enology, University of California, Davis, Davis, CA
| | - Charles B Stephensen
- Nutrition Department
- US Department of Agriculture, Western Human Nutrition Research Center, Davis, CA
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19
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Diana A, Purnamasari DM, Rahmannia S, Luftimas DE, Haszard JJ, Gibson RS, Houghton LA. Multimicronutrient Biomarkers Are Related to Anemia during Infancy in Indonesia: A Repeated Cross-Sectional Study. Curr Dev Nutr 2019; 3:nzz022. [PMID: 31037278 PMCID: PMC6483051 DOI: 10.1093/cdn/nzz022] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/31/2018] [Revised: 03/20/2019] [Accepted: 03/28/2019] [Indexed: 01/08/2023] Open
Abstract
BACKGROUND Anemia during infancy in Indonesia is common, with iron deficiency (ID) assumed to be the major cause. Other micronutrients besides iron may have a role in determining hemoglobin (Hb) but have not yet been explored in Indonesia. OBJECTIVE We investigated 7 micronutrient biomarkers and selected nonnutritional factors as potential predictors of Hb and anemia at ages 6, 9, and 12 mo in a cohort of Indonesian infants at risk of coexisting micronutrient deficiencies. METHODS Apparently healthy breastfed infants were randomly selected from birth registries at 6 mo (n = 230) and followed-up at 9 mo (n = 202) and 12 mo (n = 190). Hb, serum micronutrient biomarkers-iron [as ferritin and serum soluble transferrin receptor (sTfR)], zinc, selenium, folate, vitamin A [as retinol-binding protein (RBP)], vitamin B-12, and vitamin D (as 25-hydroxyvitamin D) (adjusted for inflammation, where appropriate)-and maternal sociodemographic status, health, BMI, heminthiasis, and selected Hb genetic disorders were measured. Multivariate analysis examined relations between micronutrient biomarkers and nonnutritional factors (except helminthiasis and genetic Hb disorders) with Hb and anemia at 6 and 12 mo. RESULTS ID (based on ferritin) was a predictor of lower Hb and anemia at both 6 and 12 mo of age (P < 0.02). Additional predictors at 6 mo were tertiary education and higher maternal Hb for higher Hb, sex (being male) and inflammation (P < 0.05) for both lower Hb and anemia, and greater maternal height (P = 0.036) for anemia only. At 12 mo, a significant biomarker predictor besides ID was RBP (P = 0.035) for Hb. CONCLUSION ID was a major contributor to lower Hb and anemia, although RBP was also associated.
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Affiliation(s)
- Aly Diana
- Faculty of Medicine, Universitas Padjadjaran, Bandung, Indonesia
- Department of Human Nutrition, University of Otago, Dunedin, New Zealand
| | | | - Sofa Rahmannia
- Faculty of Medicine, Universitas Padjadjaran, Bandung, Indonesia
| | - Dimas E Luftimas
- Faculty of Medicine, Universitas Padjadjaran, Bandung, Indonesia
| | - Jillian J Haszard
- Department of Human Nutrition, University of Otago, Dunedin, New Zealand
| | - Rosalind S Gibson
- Department of Human Nutrition, University of Otago, Dunedin, New Zealand
| | - Lisa A Houghton
- Department of Human Nutrition, University of Otago, Dunedin, New Zealand
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Sheftel J, Sowa M, Mourao L, Zoué LT, Davis CR, Simon PW, Tanumihardjo SA. Total Adipose Retinol Concentrations Are Correlated with Total Liver Retinol Concentrations in Male Mongolian Gerbils, but Only Partially Explained by Chylomicron Deposition Assessed with Total α-Retinol. Curr Dev Nutr 2019; 3:nzy096. [PMID: 30793096 PMCID: PMC6377429 DOI: 10.1093/cdn/nzy096] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2018] [Revised: 11/12/2018] [Accepted: 11/26/2018] [Indexed: 02/06/2023] Open
Abstract
BACKGROUND Liver vitamin A (VA) concentration is the gold standard for VA status, but is not routinely accessible. Adipose tissue VA concentrations, as retinol and retinyl esters, may be correlated to liver VA. α-VA (as α-retinol) is a cleavage product of α-carotene that traces postprandial VA distribution to tissues but cannot recirculate from hepatic stores, providing insight into tissue VA sources. OBJECTIVE We performed a secondary analysis of VA and α-VA in Mongolian gerbil liver and adipose to determine the suitability of adipose tissue VA as a biomarker of VA status. METHODS Gerbils (n = 186) consumed feeds containing 0-15.9 μg (0-55.6 nmol) retinol activity equivalents/g as preformed VA and/or provitamin A carotenoids for 36-62 d in 3 studies. Body fat percentage was determined in the final study by MRI. Serum and liver retinol, α-retinol, and retinyl esters were extracted and analyzed by HPLC or ultra-performance LC (UPLC). Epididymal and retroperitoneal adipose tissue retinol and α-retinol were determined by UPLC after homogenization, saponification, and extraction. Linear regression models with appropriate data transformations identified determinants of adipose VA concentrations. RESULTS Liver VA did not predict serum retinol concentrations. After logarithmic transformation of adipose and liver values, liver VA positively predicted both adipose depots' VA concentrations (P < 0.001, R 2 > 0.7). Adding serum retinol or body fat percentage did not significantly increase the adjusted R 2. In liver, α-VA concentration explained much of the variation of VA (P < 0.001, R 2 > 0.7), but far less in epididymal and retroperitoneal adipose (P = 0.004 and 0.012, respectively, R 2 < 0.4). CONCLUSIONS Adipose VA is correlated with liver VA and is a potential biomarker of VA status. It is not fully explained by chylomicron deposition and is negatively affected by serum retinol. Adipose biopsy validation is needed for human applications.
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Affiliation(s)
- Jesse Sheftel
- Interdepartmental Graduate Program in Nutritional Sciences, University of Wisconsin-Madison, Madison, WI
| | - Margaret Sowa
- Interdepartmental Graduate Program in Nutritional Sciences, University of Wisconsin-Madison, Madison, WI
| | - Luciana Mourao
- Interdepartmental Graduate Program in Nutritional Sciences, University of Wisconsin-Madison, Madison, WI
| | - Lessoy T Zoué
- Interdepartmental Graduate Program in Nutritional Sciences, University of Wisconsin-Madison, Madison, WI
| | - Christopher R Davis
- Interdepartmental Graduate Program in Nutritional Sciences, University of Wisconsin-Madison, Madison, WI
| | - Philipp W Simon
- Interdepartmental Graduate Program in Nutritional Sciences, University of Wisconsin-Madison, Madison, WI
| | - Sherry A Tanumihardjo
- Interdepartmental Graduate Program in Nutritional Sciences, University of Wisconsin-Madison, Madison, WI
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Pisprasert V, Shantavasinkul PC, Rattanachaiwong S, Lepananon T, Komindr S. Moderately high-protein enteral formula improved retinol-binding protein in tube-fed patients: A multicentre open study. Nutr Health 2019; 23:203-209. [PMID: 28929948 PMCID: PMC5761720 DOI: 10.1177/0260106017729959] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Background: Long-term inadequate dietary consumption may increase the possibility of malnutrition, morbidity and mortality. Enteral nutrition (EN) is a beneficial support that could help to maintain nutritional status and gut function. Aim: Our aim was to evaluate the effect of moderately high-protein enteral formula containing fibre on nutritional status, and its safety. Method: A total of 23 tube-feeding-dependent adult patients were included in this multicentre, open-label study. The patients were fed with the study formula for 7–12 days or equal to the required nutritional support period, during which we performed physical examinations and assessed nutritional status. The primary endpoint was the statistical difference in nutritional status after the treatment, and the secondary outcome was the desirable safety profile. Results: A significant improvement in cumulative energy balance after intervention was observed (p = 0.008). However, the differences in nutritional status, weight and BMI before and after the intervention do not reach statistical significance. Retinol-binding protein (RBP), a marker for nutritional status, increased from baseline levels. Few cases of diarrhoea and constipation had been reported during the study as a safety concern. Conclusions: This study investigated the efficacy and safety of an enteral feed formulation containing fibre. The patients were nourished with the studied formulation via tube feeding for a short period without serious adverse events. After the intervention, the significant increase in cumulative energy balance was observed. However, an extended period of the intervention may be required to attain the significance in other indicators for nutritional status.
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Affiliation(s)
- Veeradej Pisprasert
- 1 Division of Clinical Nutrition, Department of Medicine, Faculty of Medicine, Khon Kaen University, Thailand
| | | | - Sornwichate Rattanachaiwong
- 1 Division of Clinical Nutrition, Department of Medicine, Faculty of Medicine, Khon Kaen University, Thailand
| | - Tanarat Lepananon
- 2 Division of Nutrition and Biochemical Medicine, Department of Medicine, Faculty of Medicine, Ramathibodi Hospital, Mahidol University, Bangkok, Thailand
| | - Surat Komindr
- 2 Division of Nutrition and Biochemical Medicine, Department of Medicine, Faculty of Medicine, Ramathibodi Hospital, Mahidol University, Bangkok, Thailand
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Karakochuk CD, Henderson AM, Samson KLI, Aljaadi AM, Devlin AM, Becquey E, Wirth JP, Rohner F. Comparison of a New Multiplex Immunoassay for Measurement of Ferritin, Soluble Transferrin Receptor, Retinol-Binding Protein, C-Reactive Protein and α¹-Acid-glycoprotein Concentrations against a Widely-Used s-ELISA Method. Diagnostics (Basel) 2018; 8:E13. [PMID: 29393894 PMCID: PMC5871996 DOI: 10.3390/diagnostics8010013] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2018] [Revised: 01/26/2018] [Accepted: 01/31/2018] [Indexed: 01/30/2023] Open
Abstract
Recently, a multiplex ELISA (Quansys Biosciences) was developed that measures ferritin, soluble transferrin receptor (sTfR), retinol-binding protein (RBP), C-reactive protein (CRP), α¹-acid glycoprotein (AGP), thyroglobulin, and histidine-rich protein 2. Our primary aim was to conduct a method-comparison study to compare five biomarkers (ferritin, sTfR, RBP, CRP, and AGP) measured with the Quansys assay and a widely-used s-ELISA (VitMin Lab, Willstaett, Germany) with use of serum samples from 180 women and children from Burkina Faso, Cambodia, and Malaysia. Bias and concordance were used to describe the agreement in values measured by the two methods. We observed poor overall agreement between the methods, both with regard to biomarker concentrations and deficiency prevalence estimates. Several measurements were outside of the limit of detection with use of the Quansys ELISA (total n = 42 for ferritin, n = 2 for sTfR, n = 0 for AGP, n = 5 for CRP, n = 22 for RBP), limiting our ability to interpret assay findings. Although the Quansys ELISA has great potential to simplify laboratory analysis of key nutritional and inflammation biomarkers, there are some weaknesses in the procedures. Overall, we found poor comparability of results between methods. Besides addressing procedural issues, additional validation of the Quansys against a gold standard method is warranted for future research.
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Affiliation(s)
- Crystal D Karakochuk
- Food, Nutrition, and Health, University of British Columbia, Vancouver, BC V6T 1Z4, Canada.
- BC Children's Hospital Research Institute, Vancouver, BC V5Z 4H4, Canada.
| | - Amanda M Henderson
- BC Children's Hospital Research Institute, Vancouver, BC V5Z 4H4, Canada.
- Department of Paediatrics, University of British Columbia, Vancouver, BC V6H 3V4, Canada.
| | - Kaitlyn L I Samson
- Food, Nutrition, and Health, University of British Columbia, Vancouver, BC V6T 1Z4, Canada.
- BC Children's Hospital Research Institute, Vancouver, BC V5Z 4H4, Canada.
| | - Abeer M Aljaadi
- Food, Nutrition, and Health, University of British Columbia, Vancouver, BC V6T 1Z4, Canada.
- BC Children's Hospital Research Institute, Vancouver, BC V5Z 4H4, Canada.
| | - Angela M Devlin
- BC Children's Hospital Research Institute, Vancouver, BC V5Z 4H4, Canada.
- Department of Paediatrics, University of British Columbia, Vancouver, BC V6H 3V4, Canada.
| | - Elodie Becquey
- International Food Policy Research Institute, Washington, DC 20005, USA.
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Abstract
Intensive care workers actively participate in very hot debates aiming at defining the true metabolic, hormonal and nutritional requirements of critically ill patients, the contributory roles played by thyroid and retinoid ligands being largely underestimated. The present article makes up for redressing the balance on behalf of these last hormonal compounds. The retinol circulating complex is transported in the bloodstream in the form of a trimolecular edifice made up of transthyretin (TTR), retinol-binding protein (RBP) and its retinol ligand. TTR reflects the size of the lean body mass (LBM) and is one of the 3 carrier-proteins of thyroid hormones whereas RBP is the sole conveyor of retinol in human plasma. In acute inflammatory disorders, both TTR and RBP analytes experience abrupt cytokine-induced suppressed hepatic synthesis whose amplitude is dependent on the duration and severity of the inflammatory burden. The steep drop in TTR and RBP plasma values releases thyroxine and retinol ligands in their physiologically active forms, creating free pools estimated to be 10-20 times larger than those described in healthy subjects. The peak endocrine influence is reached on day 4 and the freed ligands undergo instant cellular overconsumption and urinary leakage of unmetabolized fractions. As a result of these transient hyperthyroid and hyperretinoid states, helpful stimulatory and/or inhibitory processes are set in motion, operating as second frontlines fine-tuning the impulses primarily initiated by cytokines. The data explain why preexisting protein malnutrition, as assessed by subnormal LBM and TTR values, impairs the development of appropriate recovery processes in critically ill patients. These findings have survival implications, emphasizing the need for more adapted therapeutic strategies in intensive care units.
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Zhang J, Liu Z, Zhang X, Zhang L, Jin X. Association between urine retinol-binding protein levels and nonalcoholic fatty liver disease: A cross-sectional study in Chinese population. J Clin Lab Anal 2017; 32:e22359. [PMID: 29194759 DOI: 10.1002/jcla.22359] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2017] [Accepted: 10/23/2017] [Indexed: 01/12/2023] Open
Abstract
OBJECTIVE The prevalence of nonalcoholic fatty liver disease (NAFLD) has been rapidly increased, becoming a public health problem worldwide. Our objective was to investigate the association between urine retinol-binding protein (RBP) and NAFLD in a Chinese population and develop a multivariate logistic regression model for NAFLD prediction. METHODS A total of 317 NAFLD patients and 391 healthy controls were enrolled in this cross-sectional study based on inclusion and exclusion criteria, from whom fasting urine and blood were collected for further study. Urine RBP level and other parameters were measured and compared between NAFLD subjects and controls. RESULTS Urine RBP levels (expressed by RBP/creatinine ratio) in NAFLD patients were significantly higher than controls (median 133.1 mg/g vs 110.7 mg/g; P < .001). Urine RBP/creatinine ratio was verified as an independent factor for NAFLD prediction after adjustment in multivariate logistic regression. The area under curve (AUC) of receiver operating characteristic (ROC) was 0.889 with the 95% confidence interval from 0.867 to 0.912.With a cutoff point of 0.215, the sensitivity and specificity of urine RBP/creatinine ratio in NAFLD prediction were 81.1% and 84.5%, respectively. CONCLUSION Our results demonstrated that urine RBP/creatinine ratio was an independent risk factor for NAFLD while the predictive model for NAFLD diagnosis is noninvasive with high sensitivity and specificity.
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Affiliation(s)
- Juanwen Zhang
- Department of Laboratory Medicine, The First Affiliated Hospital, School of Medicine, Zhejiang University, Hangzhou, China
| | - Zeyu Liu
- Department of Endocrinology, Sir Run Run Shaw Hospital Affiliated to School of Medicine, Zhejiang University, Hangzhou, China
| | - Xuyao Zhang
- Clinical Medicine, Hangzhou Normal University Qianjiang College, Hangzhou, China
| | - Li Zhang
- Kidney Disease Center, The First Affiliated Hospital, School of Medicine, Zhejiang University, Hangzhou, China
| | - Xi Jin
- Department of Gastroenterology, The First Affiliated Hospital, School of Medicine, Zhejiang University, Hangzhou, China
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Sobotka R, Čapoun O, Kalousová M, Hanuš T, Zima T, Koštířová M, Soukup V. Prognostic Importance of Vitamins A, E and Retinol-binding Protein 4 in Renal Cell Carcinoma Patients. Anticancer Res 2017; 37:3801-3806. [PMID: 28668878 DOI: 10.21873/anticanres.11757] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2017] [Revised: 06/10/2017] [Accepted: 06/12/2017] [Indexed: 11/10/2022]
Abstract
AIM To assess the prognostic importance of serum levels of retinol, retinol-binding protein 4 (RBP4) and vitamin E at the time of diagnosis in patients with renal cell carcinoma (RCC). PATIENTS AND METHODS In this prospective study, in a cohort of 102 renal cell carcinoma patients, relationships between serum levels of the aforementioned markers and recurrence-free survival (RFS), overall survival (OS), as well as cancer-specific survival (CSS), were evaluated. The vitamin A and vitamin E levels were determined by high-performance liquid chromatography (HPLC), while the RBP4 level by enzyme-linked immunosorbent assay (ELISA). RESULTS The median follow-up period was 39 months. Renal cell carcinoma recurred in 9 patients; 23 patients died with 12 of them from RCC. The preoperative vitamin E level was associated to RFS (p=0.02). We found a significant relationship between OS and the level of RBP4 (p=0.002), retinol (p=0.037) and vitamin E (p=0.007). The CSS period was significantly associated with the level of RBP4 (p=0.0001) and retinol (p=0.0003). Patients with an RBP4 level less than 21.0 mg/l at the time of diagnosis had a 13.5-times higher risk of death due to RCC progression; this risk was up to 7.7-times higher with vitamin A levels under 0.52 mg/l. CONCLUSION Low levels of vitamin A, E and RBP4 at the time of RCC diagnosis are associated with a poorer prognosis after surgery.
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Affiliation(s)
- Roman Sobotka
- Department of Urology, General University Hospital and 1st Faculty of Medicine, Charles University, Prague, Czech Republic
| | - Otakar Čapoun
- Department of Urology, General University Hospital and 1st Faculty of Medicine, Charles University, Prague, Czech Republic
| | - Marta Kalousová
- Institute of Medical Biochemistry and Laboratory Diagnostics, General University Hospital and 1st Faculty of Medicine, Charles University, Prague, Czech Republic
| | - Tomáš Hanuš
- Department of Urology, General University Hospital and 1st Faculty of Medicine, Charles University, Prague, Czech Republic
| | - Tomáš Zima
- Institute of Medical Biochemistry and Laboratory Diagnostics, General University Hospital and 1st Faculty of Medicine, Charles University, Prague, Czech Republic
| | - Milada Koštířová
- Institute of Medical Biochemistry and Laboratory Diagnostics, General University Hospital and 1st Faculty of Medicine, Charles University, Prague, Czech Republic
| | - Viktor Soukup
- Department of Urology, General University Hospital and 1st Faculty of Medicine, Charles University, Prague, Czech Republic
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Larson LM, Namaste SML, Williams AM, Engle-Stone R, Addo OY, Suchdev PS, Wirth JP, Temple V, Serdula M, Northrop-Clewes CA. Adjusting retinol-binding protein concentrations for inflammation: Biomarkers Reflecting Inflammation and Nutritional Determinants of Anemia (BRINDA) project. Am J Clin Nutr 2017; 106:390S-401S. [PMID: 28615251 PMCID: PMC5490644 DOI: 10.3945/ajcn.116.142166] [Citation(s) in RCA: 44] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Background: The accurate estimation of the prevalence of vitamin A deficiency (VAD) is important in planning and implementing interventions. Retinol-binding protein (RBP) is often used in population surveys to measure vitamin A status, but its interpretation is challenging in settings where inflammation is common because RBP concentrations decrease during the acute-phase response.Objectives: We aimed to assess the relation between RBP concentrations and inflammation and malaria in preschool children (PSC) (age range: 6-59 mo) and women of reproductive age (WRA) (age range: 15-49 y) and to investigate adjustment algorithms to account for these effects.Design: Cross-sectional data from 8 surveys for PSC (n = 8803) and 4 surveys for WRA (n = 4191) from the Biomarkers Reflecting Inflammation and Nutritional Determinants of Anemia (BRINDA) project were analyzed individually and combined with the use of a meta-analysis. Several approaches were explored to adjust RBP concentrations in PSC in inflammation and malaria settings as follows: 1) the exclusion of subjects with C-reactive protein (CRP) concentrations >5 mg/L or α-1-acid glycoprotein (AGP) concentrations >1 g/L, 2) the application of arithmetic correction factors, and 3) the use of a regression correction approach. The impact of adjustment on the estimated prevalence of VAD (defined as <0.7 μmol/L) was examined in PSC.Results: The relation between estimated VAD and CRP and AGP deciles followed a linear pattern in PSC. In women, the correlations between RBP and CRP and AGP were too weak to justify adjustments for inflammation. Depending on the approach used to adjust for inflammation (CRP+AGP), the estimated prevalence of VAD decreased by a median of 11-18 percentage points in PSC compared with unadjusted values. There was no added effect of adjusting for malaria on the estimated VAD after adjusting for CRP and AGP.Conclusions: The use of regression correction (derived from internal data), which accounts for the severity of inflammation, to estimate the prevalence of VAD in PSC in regions with inflammation and malaria is supported by the analysis of the BRINDA data. These findings contribute to the evidence on adjusting for inflammation when estimating VAD with the use of RBP.
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Affiliation(s)
- Leila M Larson
- Nutrition and Health Sciences Program, Laney Graduate School, and
| | - Sorrel ML Namaste
- Strengthening Partnerships, Results, and Innovations in Nutrition Globally, Arlington, VA;,Helen Keller International, Washington DC
| | - Anne M Williams
- Rollins School of Public Health, Emory University, Atlanta, GA
| | | | - O Yaw Addo
- Rollins School of Public Health, Emory University, Atlanta, GA
| | - Parminder S Suchdev
- Nutrition and Health Sciences Program, Laney Graduate School, and,Rollins School of Public Health, Emory University, Atlanta, GA;,Nutrition Branch, CDC, Atlanta, GA
| | | | - Victor Temple
- School of Medicine and Health Sciences, University of Papua New Guinea, Port Moresby, Papua New Guinea; and
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Engle-Stone R, Nankap M, Ndjebayi A, Gimou MM, Friedman A, Haskell MJ, Tarini A, Brown KH. Vitamin A Status of Women and Children in Yaoundé and Douala, Cameroon, is Unchanged One Year after Initiation of a National Vitamin A Oil Fortification Program. Nutrients 2017; 9:E522. [PMID: 28531099 DOI: 10.3390/nu9050522] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2017] [Revised: 05/06/2017] [Accepted: 05/16/2017] [Indexed: 11/17/2022] Open
Abstract
Vitamin A (VA) fortification of cooking oil is considered a cost-effective strategy for increasing VA status, but few large-scale programs have been evaluated. We conducted representative surveys in Yaoundé and Douala, Cameroon, 2 years before and 1 year after the introduction of a mandatory national program to fortify cooking oil with VA. In each survey, 10 different households were selected within each of the same 30 clusters (n = ~300). Malaria infection and plasma indicators of inflammation and VA (retinol-binding protein, pRBP) status were assessed among women aged 15-49 years and children aged 12-59 months, and casual breast milk samples were collected for VA and fat measurements. Refined oil intake was measured by a food frequency questionnaire, and VA was measured in household oil samples post-fortification. Pre-fortification, low inflammation-adjusted pRBP was common among children (33% <0.83 µmol/L), but not women (2% <0.78 µmol/L). Refined cooking oil was consumed by >80% of participants in the past week. Post-fortification, only 44% of oil samples were fortified, but fortified samples contained VA concentrations close to the target values. Controlling for age, inflammation, and other covariates, there was no difference in the mean pRBP, mean breast milk VA, prevalence of low pRBP, or prevalence of low milk VA between the pre- and post-fortification surveys. The frequency of refined oil intake was not associated with VA status indicators post-fortification. In sum, after a year of cooking oil fortification with VA, we did not detect evidence of increased plasma RBP or milk VA among urban women and preschool children, possibly because less than half of the refined oil was fortified. The enforcement of norms should be strengthened, and the program should be evaluated in other regions where the prevalence of VA deficiency was greater pre-fortification.
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28
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Abstract
The association between inflammation and vitamin A (VA) metabolism and status assessment has been documented in multiple studies with animals and humans. The relation between inflammation and carotenoid status is less clear. Nonetheless, it is well known that carotenoids are associated with certain health benefits. Understanding these relations is key to improving health outcomes and mortality risk in infants and young children. Hyporetinolemia, i.e., low serum retinol concentrations, occurs during inflammation, and this can lead to the misdiagnosis of VA deficiency. On the other hand, inflammation causes impaired VA absorption and urinary losses that can precipitate VA deficiency in at-risk groups of children. Many epidemiologic studies have suggested that high dietary carotenoid intake and elevated plasma concentrations are correlated with a decreased risk of several chronic diseases; however, large-scale carotenoid supplementation trials have been unable to confirm the health benefits and in some cases resulted in controversial results. However, it has been documented that dietary carotenoids and retinoids play important roles in innate and acquired immunity and in the body's response to inflammation. Although animal models have been useful in investigating retinoid effects on developmental immunity, it is more challenging to tease out the effects of carotenoids because of differences in the absorption, kinetics, and metabolism between humans and animal models. The current understanding of the relations between inflammation and retinoid and carotenoid metabolism and status are the topics of this review.
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Affiliation(s)
- Lewis P Rubin
- Texas Tech Health Sciences Center El Paso, El Paso, TX
| | | | | | - Torsten Bohn
- Luxembourg Institute of Health, Population Health Department, Strassen, Luxembourg; and
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29
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Zou YS, Guo Y, Cheng R, Zhou XG, Cao ZL. [Diagnostic values of prealbumin and retinol-binding protein for liver damage caused by different degrees of neonatal asphyxia]. Zhongguo Dang Dai Er Ke Za Zhi 2017; 19:337-341. [PMID: 28302208 PMCID: PMC7390137 DOI: 10.7499/j.issn.1008-8830.2017.03.017] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Subscribe] [Scholar Register] [Received: 09/27/2016] [Accepted: 12/27/2016] [Indexed: 06/06/2023]
Abstract
OBJECTIVE To investigate the diagnostic values of prealbumin (PAB) and retinol-binding protein (RBP) for liver damage caused by mild or severe asphyxia. METHODS A retrospective analysis was performed on 185 neonates (including 84 premature infants and 101 full-term infants) with asphyxia. Based on the Apgar score, they were divided into two groups: mild asphyxia group (n=150) and severe asphyxia group (n=35). The levels of PAB, RBP, alanine aminotransferase (ALT), and aspartate aminotransferase (AST) were measured and compared. Their diagnostic values for liver damage were evaluated by ROC curve analysis. RESULTS The premature infants in the severe asphyxia group had significantly higher AST level and significantly lower levels of PAB and RBP than those in the mild asphyxia group (P<0.05). The full-term infants in the severe asphyxia group had a significantly lower PAB level than those in the mild asphyxia group (P<0.05). After treatment, the PAB level was significantly improved in the premature infants in the severe asphyxia group and in the full-term infants in both mild and severe asphyxia group (P<0.05). The full-term infants in the mild asphyxia groups also showed a significant improvement in AST level (P<0.05). The ROC curve analysis showed that PAB had a good sensitivity and specificity for identifying liver damage caused by mild or severe asphyxia in full-term and preterm infants. CONCLUSIONS PAB can be used as an indicator of liver damage caused by asphyxia in neonates, and can be used to assess the degree of asphyxia.
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Affiliation(s)
- Yun-Su Zou
- Neonatal Intensive Care Unit, Children's Hospital of Nanjing Medical University, Nanjing 210008, China.
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30
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Tanumihardjo SA, Russell RM, Stephensen CB, Gannon BM, Craft NE, Haskell MJ, Lietz G, Schulze K, Raiten DJ. Biomarkers of Nutrition for Development (BOND)-Vitamin A Review. J Nutr 2016; 146:1816S-48S. [PMID: 27511929 PMCID: PMC4997277 DOI: 10.3945/jn.115.229708] [Citation(s) in RCA: 268] [Impact Index Per Article: 33.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2016] [Revised: 04/01/2016] [Accepted: 06/29/2016] [Indexed: 12/15/2022] Open
Abstract
The Biomarkers of Nutrition for Development (BOND) project is designed to provide evidence-informed advice to anyone with an interest in the role of nutrition in health. The BOND program provides information with regard to selection, use, and interpretation of biomarkers of nutrient exposure, status, function, and effect, which will be especially useful for readers who want to assess nutrient status. To accomplish this objective, expert panels are recruited to evaluate the literature and to draft comprehensive reports on the current state of the art with regard to specific nutrient biology and available biomarkers for assessing nutritional status at the individual and population levels. Phase I of the BOND project includes the evaluation of biomarkers for 6 nutrients: iodine, folate, zinc, iron, vitamin A, and vitamin B-12. This review of vitamin A is the current article in this series. Although the vitamin was discovered >100 y ago, vitamin A status assessment is not trivial. Serum retinol concentrations are under homeostatic control due in part to vitamin A's use in the body for growth and cellular differentiation and because of its toxic properties at high concentrations. Furthermore, serum retinol concentrations are depressed during infection and inflammation because retinol-binding protein (RBP) is a negative acute-phase reactant, which makes status assessment challenging. Thus, this review describes the clinical and functional indicators related to eye health and biochemical biomarkers of vitamin A status (i.e., serum retinol, RBP, breast-milk retinol, dose-response tests, isotope dilution methodology, and serum retinyl esters). These biomarkers are then related to liver vitamin A concentrations, which are usually considered the gold standard for vitamin A status. With regard to biomarkers, future research questions and gaps in our current understanding as well as limitations of the methods are described.
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Affiliation(s)
- Sherry A Tanumihardjo
- Interdepartmental Graduate Program in Nutritional Sciences, Department of Nutritional Sciences, University of Wisconsin-Madison, Madison, WI
| | | | | | - Bryan M Gannon
- Interdepartmental Graduate Program in Nutritional Sciences, Department of Nutritional Sciences, University of Wisconsin-Madison, Madison, WI
| | | | | | - Georg Lietz
- Newcastle University, Newcastle, United Kingdom
| | - Kerry Schulze
- Bloomberg School of Public Health, Johns Hopkins University, Baltimore, MD; and
| | - Daniel J Raiten
- Eunice Kennedy Shriver National Institute of Child Health and Human Development, NIH, Bethesda, MD
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Chen S, Hong K, Zou F, Peng Q, Hu W, Li J, Lai X, Cheng X, Su H. Impact of glucose load in an oral glucose tolerance test on urinary albumin excretion varies with 2-h glucose levels. J Diabetes 2016; 8:206-13. [PMID: 25676539 DOI: 10.1111/1753-0407.12277] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/06/2014] [Revised: 01/29/2015] [Accepted: 01/30/2015] [Indexed: 11/26/2022] Open
Abstract
BACKGROUND The aim of the present study was to investigate whether an oral glucose load can induce an increase in urinary albumin excretion (UAE). METHODS One hundred and thirty subjects without macroalbuminuria or increased fasting serum glucose (≥7.0 mmol/L) were included in the study. At 0600 hours, subjects were asked to empty their bladder and drink 300 mL water. At 0800 hours, venous blood and 2-h urine were collected for fasting examination. Subjects were then asked to drink 300 mL solution containing 75 g glucose and, at 1000 hours, samples were collected again for post-challenge examination. Concentrations of serum glucose, urinary glucose, albumin, N-acetyl-β-D-glucosaminidase and retinol-binding protein were measured. RESULTS Based on the results of the oral glucose tolerance test, subjects were divided into three groups: (i) normal glucose tolerance (NGT; n = 55); (ii) impaired glucose tolerance (IGT; n = 39); and (iii) newly diagnosed diabetes mellitus (NDM; n = 36). In the NDM group, post-challenge urinary excretion of glucose and albumin was 14- and 1.6-fold greater than fasting values, respectively. In the IGT and NGT groups, although post-challenge urinary glucose excretion was 2.6- and 1.6-fold greater than fasting values, UAE did not increase. There was a positive correlation between post-challenge serum glucose and the UAE rate (UAER; r = 0.24, P < 0.01) and the UAER increment (ΔUAER; r = 0.19, P < 0.05), as well as between the serum glucose increment and post-challenge UAER (r = 0.23, P < 0.01) and ΔUAER (r = 0.18, P < 0.05). Post-challenge serum glucose levels were independently correlated with logarithmically converted post-challenge UAER (β = 0.322, P = 0.008). CONCLUSIONS Oral glucose load can induce a significant increase in UAE in NDM subjects. The main mechanism may be glomerular hyperfiltration.
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Affiliation(s)
- Sisi Chen
- Department of Cardiology, Second Affiliated Hospital of Nanchang University, Nanchang, China
| | - Kui Hong
- Department of Cardiology, Second Affiliated Hospital of Nanchang University, Nanchang, China
| | - Fang Zou
- Department of Endocrinology and Metabolism, Second Affiliated Hospital of Nanchang University, Nanchang, China
| | - Qiang Peng
- Department of Cardiology, Second Affiliated Hospital of Nanchang University, Nanchang, China
| | - Weitong Hu
- Department of Cardiology, Second Affiliated Hospital of Nanchang University, Nanchang, China
| | - Juxiang Li
- Department of Cardiology, Second Affiliated Hospital of Nanchang University, Nanchang, China
| | - Xiaoyang Lai
- Department of Endocrinology and Metabolism, Second Affiliated Hospital of Nanchang University, Nanchang, China
| | - Xiaoshu Cheng
- Department of Cardiology, Second Affiliated Hospital of Nanchang University, Nanchang, China
| | - Hai Su
- Department of Cardiology, Second Affiliated Hospital of Nanchang University, Nanchang, China
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Doppler K, Schütt M, Sommer C. Decreased levels of aquaporin-4 in the cerebrospinal fluid of patients with idiopathic intracranial hypertension. Cephalalgia 2016; 36:1379-1384. [PMID: 26853804 DOI: 10.1177/0333102416630592] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2015] [Revised: 12/28/2015] [Accepted: 01/01/2016] [Indexed: 11/16/2022]
Abstract
BACKGROUND Idiopathic intracranial hypertension is characterized by increased intracranial pressure. Its pathogenesis is largely unknown. Aquaporins may play a role in the homeostasis of cerebrospinal fluid. METHODS We aimed to elucidate the role of aquaporins in idiopathic intracranial hypertension by measuring the level of aquaporin-1 and aquaporin-4 in the cerebrospinal fluid and plasma of 28 patients and 29 controls by enzyme-linked immunosorbent assay. The adipokines leptin and retinol-binding protein 4 were also measured. RESULTS We found a reduction in aquaporin-4 in the cerebrospinal fluid of patients. Leptin levels were increased in the cerebrospinal fluid and plasma of patients and were correlated with weight, body mass index and body fat. There was no difference between patients and controls in the levels of aquaporin-1 and retinol-binding protein 4. CONCLUSION Our data suggest that an imbalance of aquaporin-4 in the cerebrospinal fluid of patients with idiopathic intracranial hypertension may contribute to the pathogenesis of this disorder.
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Affiliation(s)
- Kathrin Doppler
- Department of Neurology, University Hospital Würzburg, Würzburg, Germany
| | - Morten Schütt
- Department of Internal Medicine I, University Hospital Lübeck, Lübeck, Germany
| | - Claudia Sommer
- Department of Neurology, University Hospital Würzburg, Würzburg, Germany
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Larson LM, Addo OY, Sandalinas F, Faigao K, Kupka R, Flores-Ayala R, Suchdev PS. Accounting for the influence of inflammation on retinol-binding protein in a population survey of Liberian preschool-age children. Matern Child Nutr 2016; 13. [PMID: 26842430 DOI: 10.1111/mcn.12298] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/28/2015] [Revised: 12/30/2015] [Accepted: 12/31/2015] [Indexed: 11/30/2022]
Abstract
Vitamin A deficiency (VAD) is an important contributor to child morbidity and mortality. The prevalence of VAD, measured by retinol-binding protein (RBP) or retinol, is overestimated in populations with a high prevalence of inflammation. We aimed to quantify and adjust for the effect of inflammation on VAD prevalence in a nationally representative survey of Liberian children 6 to 35 months of age. We compared five approaches to adjust RBP for inflammation and estimate VAD prevalence (defined as RBP < 0.7 µmol/L): (1) ignoring inflammation; (2) excluding individuals with inflammation (C-reactive protein (CRP) >5 mg/L or alpha1-acid glycoprotein (AGP) >1 g/)L; (3) multiplying each individual's RBP by an internal correction factor; (4) by an external correction factor; and (5) using regression (corrected RBP = exp(InRBP - β1 (lnCRPobs -lnCRPref ) - β2 (lnAGPobs -lnAGPref )). Corrected RBP was based on a regression model where reference lnCRP and lnAGP were set to the maximum of the lowest decile. The unadjusted prevalence of VAD was 24.7%. Children with elevated CRP and/or AGP had significantly lower RBP concentrations than their apparently healthy peers (geometric mean RBP 0.79 µmol/L (95% CI: 0.76, 0.82) vs. 0.95 µmol/L (95% CI: 0.92, 0.97), P < 0.001). Using approaches 2-5 resulted in a prevalence of VAD of 11.6%, 14.3%, 13.5% and 7.3%, respectively. Depending on the approach, the VAD prevalence is reduced 10-17 percentage points when inflammation is taken into account. Further quantification of the influence of inflammation on biomarkers of vitamin A status from other national surveys is needed to compare and recommend the preferred adjustment approach across populations.
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Affiliation(s)
- Leila Margaret Larson
- Nutrition and Health Sciences Program, Laney Graduate School, Emory University, Atlanta, Georgia, USA
| | - O Yaw Addo
- Rollins School of Public Health, Emory University, Atlanta, Georgia, USA
| | - Fanny Sandalinas
- UNICEF Regional Office for West and Central Africa, Dakar, Senegal
| | | | - Roland Kupka
- UNICEF Regional Office for West and Central Africa, Dakar, Senegal
| | - Rafael Flores-Ayala
- Rollins School of Public Health, Emory University, Atlanta, Georgia, USA.,Nutrition Branch, Centers for Disease Control and Prevention, Atlanta, Georgia, USA
| | - Parminder S Suchdev
- Nutrition and Health Sciences Program, Laney Graduate School, Emory University, Atlanta, Georgia, USA.,Rollins School of Public Health, Emory University, Atlanta, Georgia, USA.,Nutrition Branch, Centers for Disease Control and Prevention, Atlanta, Georgia, USA
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Abstract
BACKGROUND Although there are many available data about renal involvement in patients with beta thalassemia major (TM), the changes in renal functions of other types, such as thalassemia intermedia (TI) and thalassemia minor (TMin), were reported less. Therefore, we aimed to evaluate renal tubular and glomerular functions in patients with three types of beta thalassemia. METHODS This prospective case-control study was conducted on 118 beta-thalassemia patients (49 in TM, 18 in TI and 51 TMin) and 51 healthy controls. Glomerular functions [estimated glomerular filtration rate (GFR), serum cystatin C and urinary protein creatinine ratio] and tubular functions [fractioned sodium excretion (FENa), tubular reabsorption of phosphorus, urinary excretion of uric acid, levels of retinol-binding protein, alpha-1 macroglobulin (alpha-1M), and beta-2 microglobulin, calcium creatinine ratio] were assessed in all patients and controls. RESULTS The mean ages of the groups and controls at presentation were similar. Although GFR was similar in all patients and control groups, serum levels of cystatin C in patients with TM and TI were significantly higher compared to TMin and controls. Alpha-1M, FENa, urinary excretion of uric acid, and urine protein/creatinine ratio in TM and TI groups were significantly higher than the others. Mean cystatin C level was also higher in patients with TMin compared the controls. However, there were no significant differences according to all tubular and other glomerular functions between TMin and control groups. CONCLUSIONS Although all types of beta thalassemia patients should be closely monitored to prevent further decrease in renal functions, the patients with TI should be considered to have a higher risk of glomerular and tubular deterioration as well as TM.
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Affiliation(s)
| | | | - Selçuk Yüksel
- c Department of Pediatric Nephrology , Pamukkale University School of Medicine , Denizli , Turkey
| | - Yusuf Ziya Aral
- d Department of Pediatric Hematology , Adnan Menderes University School of Medicine , Aydın , Turkey
| | | | - Beyza Akdağ
- f Department of Biostatistics , Pamukkale University School of Medicine , Denizli , Turkey
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Rey-Burusco MF, Ibáñez-Shimabukuro M, Gabrielsen M, Franchini GR, Roe AJ, Griffiths K, Zhan B, Cooper A, Kennedy MW, Córsico B, Smith BO. Diversity in the structures and ligand-binding sites of nematode fatty acid and retinol-binding proteins revealed by Na-FAR-1 from Necator americanus. Biochem J 2015; 471:403-14. [PMID: 26318523 DOI: 10.1042/BJ20150068] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2015] [Accepted: 08/27/2015] [Indexed: 11/17/2022]
Abstract
Fatty acid and retinol-binding proteins (FARs) comprise a family of unusual α-helix rich lipid-binding proteins found exclusively in nematodes. They are secreted into host tissues by parasites of plants, animals and humans. The structure of a FAR protein from the free-living nematode Caenorhabditis elegans is available, but this protein [C. elegans FAR-7 (Ce-FAR-7)] is from a subfamily of FARs that does not appear to be important at the host/parasite interface. We have therefore examined [Necator americanus FAR-1 (Na-FAR-1)] from the blood-feeding intestinal parasite of humans, N. americanus. The 3D structure of Na-FAR-1 in its ligand-free and ligand-bound forms, determined by NMR (nuclear magnetic resonance) spectroscopy and X-ray crystallography respectively, reveals an α-helical fold similar to Ce-FAR-7, but Na-FAR-1 possesses a larger and more complex internal ligand-binding cavity and an additional C-terminal α-helix. Titration of apo-Na-FAR-1 with oleic acid, analysed by NMR chemical shift perturbation, reveals that at least four distinct protein-ligand complexes can be formed. Na-FAR-1 and possibly other FARs may have a wider repertoire for hydrophobic ligand binding, as confirmed in the present study by our finding that a range of neutral and polar lipids co-purify with the bacterially expressed recombinant protein. Finally, we show by immunohistochemistry that Na-FAR-1 is present in adult worms with a tissue distribution indicative of possible roles in nutrient acquisition by the parasite and in reproduction in the male.
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Unal S, Kotan C, Delibas A, Oztas Y. Cystatin C, Beta2 Microglobulin, N-Acetyl-beta-D-glucosaminidase, Retinol-Binding Protein, and Endothelin 1 Levels in the Evaluation of Sickle Cell Disease Nephropathy. Pediatr Hematol Oncol 2015; 32:250-7. [PMID: 23987825 DOI: 10.3109/08880018.2013.810317] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
OBJECTIVES Renal involvement is common in sickle cell disease (SCD). Early demonstration of renal injury and commencement of appropriate treatment will increase survival and quality of life in these patients. We investigated renal manifestations in our pediatric and adult SCD patients and evaluated the role of cystatin C, Beta2 microglobulin (B2M), retinol-binding protein (RBP), N-acetyl-beta-D-glucosaminidase (NAG), and endothelin-1 (ET-1) to indicate renal damage. METHODS The study involved 45 pediatric and 10 adult patients with SCD and 20 healthy children and 10 healthy adults as a control. All the patients were questioned for possible renal manifestations. 24-hour urine samples were collected and glomerular filtration rates (GFRs) were calculated by using creatinine (GFR(creatinine)), Schwartz formula (GFR(Schwartz)), and cystatin C (GFR(cystatin C)). Blood and urine samples were collected and serum cystatin C, urine B2M, RBP, NAG, and ET-1 levels were measured. RESULTS Nocturnal enuresis and proteinuria were the most common renal manifestations in SCD patients. When the groups were compared in terms of GFR, GFR(creatinine) and GFR(Schwartz) levels were higher in group 1 and 2 patients than in control 1 and 2 patients (P < .05). Cystatin C, B2M, RBP, NAG, and ET-1 values were normal in both the patient and the control groups. However, B2M/creatinine levels were higher than 160 μg/mg creatinine levels in 10 patients. CONCLUSIONS Serum cystatin C, urine NAG, RBP, and ET-1 levels were found to be insufficient for the evaluation of SCD nephropathy. Increased B2M/creatinie levels can be valuable in estimating possible glomerular and tubular damage in SCD.
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Affiliation(s)
- Selma Unal
- Faculty of Medicine, Department of Pediatrics, Hematology Unit (SU), Nephrology Unit (AD), Mersin University , Mersin , Turkey
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Jugnam-Ang W, Pannengpetch S, Isarankura-Na-Ayudhya P, Thippakorn C, Isarankura-Na-Ayudhya C, Lawung R, Prachayasittiku V. Retinol-binding protein 4 and its potential roles in hypercholesterolemia revealed by proteomics. EXCLI J 2015; 14:999-1013. [PMID: 27103892 PMCID: PMC4834671 DOI: 10.17179/excli2015-478] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/21/2015] [Accepted: 08/17/2015] [Indexed: 01/28/2023]
Abstract
Effects of hypercholesterolemia on alterations of serum proteins have not been fully elucidated. Herein, using two-dimensional gel electrophoresis (2-DE) in conjunction with LC-MS searching has successfully been carried out to investigate the change of protein expression profiles as consequences of raised blood cholesterol at different levels (normal group: total cholesterol 200 mg/dL; borderline high group: total cholesterol 200-239 mg/dL; and high group: total cholesterol ≥ 240 mg/dL) (n = 45). Results revealed that down-regulation of retinol-binding protein 4 (RBP4) (-2.26 fold), transthyretin (-1.25 fold) and gelsolin (-1.47 fold) was observed in the high group. Meanwhile, the other proteins such as haptoglobin, complement factor B and CD5 antigen-like protein were up-regulated upto +3.24, +1.96 and +2.04 fold, respectively. Confirmation by Western blotting revealed a significant reduction of RBP4 (approximately 50 %) in individual samples derived from the high group. Presumptive conclusion can be drawn that down-regulation of RBP4 might be attributable to the inflammation of adipocytes caused by the release of proinflammatory cytokines (e.g. tumor necrosis factor α and interleukin-1β) from adipose tissues. Moreover, the decrease of transthyretin might also be taken into accounts since it is known that the transthyretin usually forms complex with RBP4 to prevent glomerular filtration and excretion through the kidney. The suppressing effect on RBP4 should be potentiated by the increase of complement factor B and CD5 antigen-like protein, which rendered the adipose tissues to overwhelm the liberation of RBP4 to blood circulation by metabolic and inflammatory processes. Such inflammation could further modulate the induction of cytokine release (e.g. IL-6 and IL-1β), resulting in the synthesis of acute phase protein, in particular, haptoglobin and C-reactive proteins from hepatocytes. However, the mechanism of gelsolin reduction remains unclear. Among these differentially expressed proteins, the RBP4 has been proposed as a major linkage between hypercholesterolemia, adipose tissues, liver and kidney, which is believed to be a potential biomarker for metabolic and cardiovascular disorders associated with dyslipidemia in the future.
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Affiliation(s)
- Watcharapong Jugnam-Ang
- Department of Clinical Microbiology and Applied Technology, Faculty of Medical Technology, Mahidol University, Bangkok 10700, Thailand
| | - Supitcha Pannengpetch
- Center for Research and Innovation, Faculty of Medical Technology, Mahidol University, Bangkok 10700, Thailand
| | | | - Chadinee Thippakorn
- Center for Research and Innovation, Faculty of Medical Technology, Mahidol University, Bangkok 10700, Thailand
| | | | - Ratana Lawung
- Department of Clinical Microbiology and Applied Technology, Faculty of Medical Technology, Mahidol University, Bangkok 10700, Thailand
| | - Virapong Prachayasittiku
- Department of Clinical Microbiology and Applied Technology, Faculty of Medical Technology, Mahidol University, Bangkok 10700, Thailand
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Polyzos SA, Kountouras J, Anastasilakis AD, Geladari EV, Mantzoros CS. Irisin in patients with nonalcoholic fatty liver disease. Metabolism 2014; 63:207-17. [PMID: 24140091 DOI: 10.1016/j.metabol.2013.09.013] [Citation(s) in RCA: 148] [Impact Index Per Article: 14.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/26/2013] [Revised: 09/14/2013] [Accepted: 09/16/2013] [Indexed: 02/07/2023]
Abstract
OBJECTIVE Irisin is a recently discovered myokine proposed to increase thermogenesis-related energy expenditure and improve metabolism. We aimed to comparatively evaluate serum irisin levels in patients with biopsy-proven nonalcoholic fatty liver disease (NAFLD) vs. controls and study their association with disease severity. METHODS Fifteen and 16 consecutively enrolled patients with biopsy-proven nonalcoholic simple steatosis (NAFL) and steatohepatitis (NASH), respectively, and 24 lean and 28 obese controls without NAFLD were recruited. Irisin, established adipokines and biochemical tests were measured. RESULTS Serum irisin levels were statistically different in obese controls (33.7±2.7 ng/mL; p<0.001) and patients with NAFL (30.5±1.5 ng/mL; p<0.001) and NASH (35.8±1.9 ng/mL; p=0.001) compared with lean controls (47.7±2.0 ng/mL), but were similar among patients with NAFL, NASH and obese controls. This difference remained significant after adjustment for body mass index (or waist circumference), gender, age, insulin resistance (assessed by HOMA-IR or QUICKI), exercise and time since blood collection. Serum leptin and adiponectin, but not irisin, levels were independently from BMI correlated with insulin resistance and cardiometabolic factors. Serum irisin tended to be higher in patients with (36.7±2.4 ng/mL) than without (30.8±1.2 ng/mL; p=0.02) portal inflammation and independently associated with the latter; these data need to be confirmed by future studies. CONCLUSIONS Serum irisin levels differ between lean controls and obese controls or NAFLD patients. Despite similar circulating irisin levels between NAFL and NASH groups, irisin may be independently and positively associated with the presence of portal inflammation. Future clinical and mechanistic studies are needed to confirm and extend these data.
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Affiliation(s)
- Stergios A Polyzos
- Department of Medicine, Second Medical Clinic, Aristotle University of Thessaloniki, Ippokration Hospital, Thessaloniki, Greece.
| | - Jannis Kountouras
- Department of Medicine, Second Medical Clinic, Aristotle University of Thessaloniki, Ippokration Hospital, Thessaloniki, Greece
| | | | - Eleni V Geladari
- Boston VA Healthcare system and Division of Endocrinology, Diabetes and Metabolism, Department of Internal Medicine, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA, USA
| | - Christos S Mantzoros
- Boston VA Healthcare system and Division of Endocrinology, Diabetes and Metabolism, Department of Internal Medicine, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA, USA
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Kato S, Matsukawa T, Koriyama Y, Sugitani K, Ogai K. A molecular mechanism of optic nerve regeneration in fish: the retinoid signaling pathway. Prog Retin Eye Res 2013; 37:13-30. [PMID: 23994437 DOI: 10.1016/j.preteyeres.2013.07.004] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2013] [Revised: 07/30/2013] [Accepted: 07/30/2013] [Indexed: 12/20/2022]
Abstract
The fish optic nerve regeneration process takes more than 100 days after axotomy and comprises four stages: neurite sprouting (1-4 days), axonal elongation (5-30 days), synaptic refinement (35-80 days) and functional recovery (100-120 days). We screened genes specifically upregulated in each stage from axotomized fish retina. The mRNAs for heat shock protein 70 and insulin-like growth factor-1 rapidly increased in the retinal ganglion cells soon after axotomy and function as cell-survival factors. Purpurin mRNA rapidly and transiently increased in the photoreceptors and purpurin protein diffusely increased in all nuclear layers at 1-4 days after injury. The purpurin gene has an active retinol-binding site and a signal peptide. Purpurin with retinol functions as a sprouting factor for thin neurites. This neurite-sprouting effect was closely mimicked by retinoic acid and blocked by its inhibitor. We propose that purpurin works as a retinol transporter to supply retinoic acid to damaged RGCs which in turn activates target genes. We also searched for genes involved in the second stage of regeneration. The mRNA of retinoid-signaling molecules increased in retinal ganglion cells at 7-14 days after injury and tissue transglutaminase and neuronal nitric oxide synthase mRNAs, RA-target genes, increased in retinal ganglion cells at 10-30 days after injury. They function as factors for the outgrowth of thick, long neurites. Here we present a retinoid-signaling hypothesis to explain molecular events during the early stages of optic nerve regeneration in fish.
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Affiliation(s)
- Satoru Kato
- Department of Molecular Neurobiology, Graduate School of Medicine, Kanazawa University, 13-1 Takaramachi, Kanazawa 920-8640, Japan.
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Sarang Z, Garabuczi É, Joós G, Kiss B, Tóth K, Rühl R, Szondy Z. Macrophages engulfing apoptotic thymocytes produce retinoids to promote selection, differentiation, removal and replacement of double positive thymocytes. Immunobiology 2013; 218:1354-60. [PMID: 23932496 DOI: 10.1016/j.imbio.2013.06.009] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2013] [Revised: 06/04/2013] [Accepted: 06/17/2013] [Indexed: 11/30/2022]
Abstract
The thymus provides the microenvironment in which thymocytes develop into mature T-cells, and interactions with thymic stromal cells are thought to provide the necessary signals for thymocyte maturation. Recognition of self-MHC by T-cells is a basic requirement for mature T-cell functions, and those thymocytes that do not recognize or respond too strongly to the peptide-loaded self-MHC molecules found in the thymus undergo apoptosis. As a result, 95% of the thymocytes produced will die and be subsequently cleared by macrophages. This review describes a complex crosstalk between developing thymocytes and engulfing macrophages which is mediated by retinoids produced by engulfing macrophages. The interaction results in the harmonization of the rate of cell death of dying double positive cells with their clearance and replacement, and in promotion of the differentiation of the selected cells in the thymus.
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Affiliation(s)
- Zsolt Sarang
- Section of Dental Biochemistry, Department of Biochemistry and Molecular Biology, Research Center of Molecular Medicine, University of Debrecen, Nagyerdei krt. 98, 4012 Debrecen, Hungary
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Delport R, Bornman R, MacIntyre UE, Oosthuizen NM, Becker PJ, Aneck-Hahn NH, de Jager C. Changes in retinol-binding protein concentrations and thyroid homeostasis with nonoccupational exposure to DDT. Environ Health Perspect 2011; 119:647-51. [PMID: 21156399 PMCID: PMC3094415 DOI: 10.1289/ehp.1002616] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/24/2010] [Accepted: 12/14/2010] [Indexed: 05/22/2023]
Abstract
BACKGROUND The insecticide dichlorodiphenyltrichloroethane (DDT) has been used for malaria vector control in the northern and eastern parts of the Vhembe District of Limpopo Province, South Africa, since 1945. Bioaccumulation of DDT raises concern because it reportedly affects thyroid function. OBJECTIVE Our objective was to investigate the association between DDT uptake (as reflected in plasma concentrations) and thyroid homeostasis while considering related factors. METHODS We compared dietary intake, serum retinol-binding protein (RBP), transthyretin (TTR) and albumin concentrations, and liver and thyroid function between cases with evidence of a body burden of DDT in the circulation (concentration of any DDT isomer ≥ 0.02 µg/g lipid; n = 278) and controls (concentration of all DDT isomers < 0.02 µg/g lipid; n = 40) in a cross-sectional study. Further analyses were performed to assess the relevance of changes in RBP status associated with DDT uptake. RESULTS RBP concentrations below the reference range were more prevalent in cases (54% vs. 10% in controls; χ² = 27.4; p < 0.001), which could not be explained by nutrient intake. We observed significantly lower thyroid hormone concentrations among cases (p ≤ 0.01). We also observed a significant linear trend for serum concentrations of free thyroxine and free triiodothyronine (p < 0.001) and a significant quadratic trend for serum thyroid-stimulating hormone (p = 0.025) and TTR (p < 0.001) across the control group and case groups with normal and relatively low RBP concentrations. Relatively low RBP concentrations were associated with significantly higher DDT and 1,1-dichloro-2,2-bis(p-chlorophenyl) ethylene (DDE) isomer concentrations and with a higher DDE/DDT ratio (p ≤ 0.01), which signifies long-term exposure. Inadequate intake of vitamin A and zinc were observed in 84% and 58%, respectively, of the total study population. CONCLUSION RBP concentrations appear to decrease in the presence of long-term DDT uptake, which may have deleterious effects on thyroid function and vitamin A nutritional status. This is of major concern in a population with poor vitamin A and zinc intake.
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Affiliation(s)
- Rhena Delport
- Department of Chemical Pathology, School of Medicine, University of Pretoria, Pretoria, South Africa.
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Chaumont A, De Winter F, Dumont X, Haufroid V, Bernard A. The threshold level of urinary cadmium associated with increased urinary excretion of retinol-binding protein and beta 2-microglobulin: a re-assessment in a large cohort of nickel-cadmium battery workers. Occup Environ Med 2011; 68:257-64. [PMID: 20935291 PMCID: PMC3060309 DOI: 10.1136/oem.2009.054122] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 06/23/2010] [Indexed: 11/04/2022]
Abstract
OBJECTIVE To evaluate the threshold value of urinary cadmium (CdU) for renal dysfunction on the basis of relationships unconfounded by protein degradation, diuresis and the renal effects associated with chronic smoking. Methods We studied 599 workers (451 men, mean age 45.4 years) who were employed in four nickel-cadmium battery plants for 18.8 years on average. After adjustment for covariates by multiple regression, the CdU threshold values for increased concentrations of retinol-binding protein (RBPU) and b(2)-microglobulin (b(2)-mU) were assessed by logistic regression and benchmark dose analyses using as referents workers with CdU<1 μg/g creatinine. Results Relationships between urinary proteins and CdU (μg/g creatinine) were influenced by sex, age, diuresis and especially smoking. When considering all workers, odds for abnormal RBPU and b(2)-mU were significantly increased from CdU of 6-10 and >10, respectively. The benchmark dose (BMD5) and the benchmark dose lower limit (BMDL5) for a 5% excess in the background prevalence of abnormal RBPU and b(2)-mU were estimated at 5.1/3.0 and 9.6/5.9. When excluding ever smokers, odds for abnormal RBPU and b(2)-mU were both increased only among workers with CdU>10 (OR, 21.8, 95% CI, 6.4-74.4 and OR, 15.1, 95% CI, 3.6-63.1, respectively). In never smokers, these BMD5/BMDL5 of CdU were estimated at 12.6/6.6 and 12.2/5.5 while in ever smokers they were 6.2/4.9 and 4.3/3.5. Conclusions On the basis of associations undistorted by smoking and adjusted for covariates, the BMDL5 of CdU for low-molecular-weight proteinuria induced by occupational exposure to Cd can be reliably estimated between 5.5 and 6.6 μg/g creatinine.
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Affiliation(s)
- Agnès Chaumont
- Unit of Toxicology and Applied Pharmacology, Catholic University of Louvain, Avenue E Mounier 53.02, Brussels B-1200, Belgium
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Vieira MM, Paik J, Blaner WS, Soares AM, Mota RM, Guerrant RL, Lima AA. Carotenoids, retinol, and intestinal barrier function in children from northeastern Brazil. J Pediatr Gastroenterol Nutr 2008; 47:652-9. [PMID: 18955868 DOI: 10.1097/MPG.0b013e31816bf4bf] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/10/2022]
Abstract
OBJECTIVES To investigate the association of carotenoids and retinol (vitamin A) with intestinal barrier function in children in an urban community in Fortaleza, northeastern Brazil. METHODS Descriptive analysis of serum carotenoids and retinol concentrations with intestinal barrier function in 102 children from an urban community, July 2000 to August 2001. RESULTS The weight for height z score (wasting) showed that 19.6% (20/102) had mild malnutrition (-1 to -2 z score). All of the children's serum retinol concentrations were determined and none were severely deficient (< or =0.35 micromol/L), 2.9% (3/102) were moderately (0.36-0.70 micromol/L) deficient, 20.6% (21/102) were mildly (0.71-1.05 micromol/L) deficient; 76.5% (78/102) were vitamin A sufficient (>1.05 micromol/L). The lactulose:mannitol (L/M) ratio was elevated (> or =0.0864) in 49% (47/97) of children when compared with healthy children with normal L/M ratio (<0.0864) in the same geographic area. Serum carotenoids, lutein, beta-cryptoxanthin and beta-carotene showed significant inverse correlations with the L/M ratio, but not lutein after adjusting for age. Acute phase proteins (C-reactive protein and alpha-acid glycoprotein) were significantly inversely correlated with retinol but not with carotenoids. Retinol and retinol-binding protein were not significantly associated with L/M ratio. CONCLUSIONS These data suggest a disruption of intestinal barrier function in the paracellular pathway with low serum concentrations of carotenoids. Carotenoids may provide a better marker for disrupted intestinal barrier function than retinol-binding protein or retinol.
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Zheng W, Lu YM, Lu GY, Zhao Q, Cheung O, Blaner WS. Transthyretin, thyroxine, and retinol-binding protein in human cerebrospinal fluid: effect of lead exposure. Toxicol Sci 2001; 61:107-14. [PMID: 11294981 PMCID: PMC4126162 DOI: 10.1093/toxsci/61.1.107] [Citation(s) in RCA: 53] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Transthyretin (TTR), synthesized by the choroid plexus, is proposed to have a role in transport of thyroid hormones in the brain. Our previous studies in animals suggest that sequestration of lead (Pb) in the choroid plexus may lead to a marked decrease in TTR levels in the cerebrospinal fluid (CSF). The objectives of this study were to establish in humans whether TTR and thyroxine (T(4)) are correlated in the CSF, and whether CSF levels of Pb are associated with those of TTR, T(4), and/or retinol-binding protein (RBP). Eighty-two paired CSF and blood/serum samples were collected from patients undergoing clinical diagnosis of CSF chemistry. Results showed that the mean value of CSF concentrations for TTR was 3.33 +/- 1.60 microg/mg of CSF proteins (mean +/- SD, n = 82), for total T(4) (TT(4)) was 1.56 +/- 1.68 ng/mg (n = 82), for RBP was 0.34 +/- 0.19 microg/mg (n = 82), and for Pb was 0.53 +/- 0.69 microg/dl (n = 61 for those above the detection limit). Linear regression analyses revealed that CSF TTR levels were positively associated with those of CSF TT(4) (r = 0.33, p < 0.005). CSF TTR concentrations, however, were inversely associated with CSF Pb concentrations (r = -0.29, p < 0.05). There was an inverse, albeit weak, correlation between CSF TT(4) and CSF Pb concentrations (r = -0.22, p = 0.09). The concentrations of TTR, TT(4), and Pb in the CSF did not vary as the function of their levels in blood or serum, but RBP concentrations in the CSF did correlate to those of serum (r = 0.39, p < 0.0005). Unlike TTR, CSF RBP concentrations were not influenced by PB: These human data are consistent with our earlier observations in animals, which suggest that TTR is required for thyroxine transport in the CSF and that Pb exposure is likely associated with diminished TTR levels in the CSF.
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Affiliation(s)
- W Zheng
- Division of Environmental Health Sciences, School of Public Health, Columbia University, New York, New York 10032, USA.
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Abstract
Anti-idiotypic antibodies have been raised against antibodies to retinol-binding protein (RBP) and to insulin. After absorption the anti-idiotypic antibodies recognized the antigen-combining sites of the antibodies used as the immunogen but of no other antibodies. Some of the anti-idiotypic antibodies raised against antibodies to RBP bound specifically to rat intestine epithelial cells, which have a physiological cell-surface receptor for RBP. The RBP receptor mediates the uptake of retinol from RBP to the cells. This uptake was abolished in a concentration-dependent manner by the anti-idiotypic antibodies, which obviously competed with RBP for binding to the receptor.Anti-idiotypic antibodies against antibodies to insulin inhibited the binding of (125)I-labeled insulin to isolated rat epididymal fat cells, whereas anti-idiotypic antibodies raised against antibodies to RBP had no effect. Furthermore, on interacting with young rat thymocytes, anti-idiotypic antibodies against antibodies to insulin stimulated the uptake by the cells of alpha-aminoisobutyric acid, thereby mimicking the effect of insulin. These results suggest that in some cases anti-idiotypic antibodies may be useful tools in elucidating structure-function relationships for cell-membrane receptors.
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