1
|
Abdallah ABE, El-Ghannam MA, Hasan AA, Mohammad LG, Mesalam NM, Alsayed RM. Selenium Nanoparticles Modulate Steroidogenesis-Related Genes and Improve Ovarian Functions via Regulating Androgen Receptors Expression in Polycystic Ovary Syndrome Rat Model. Biol Trace Elem Res 2023; 201:5721-5733. [PMID: 36922476 PMCID: PMC10620277 DOI: 10.1007/s12011-023-03616-0] [Citation(s) in RCA: 7] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/29/2022] [Accepted: 02/25/2023] [Indexed: 03/18/2023]
Abstract
Polycystic ovary syndrome (PCOS) occurs during the reproductive period in women and is characterized by reproductive, endocrine, and metabolic disorders. Androgen plays a decisive role in its pathogenesis due to the interaction between hyperandrogenism and insulin resistance, which might be improved by selenium nanoparticles (SeNPs). The present study aimed to clarify the effect of SeNPs on androgen synthesis and action in the PCOS model and the resulting effect on ovarian function. Fifty-five 7-week-old female albino rats (90-105 g) were divided equally into five groups: control (C), fed a standard diet for 11 weeks; high-fat diet (HFD) group, fed HFD for 11 weeks; HFD and letrozole (L) (HFD + L), fed HFD for 11 weeks and administrated orally with L, at a daily dose of 1 mg/kg BW, for three weeks from the 7th to 9th week of the trial; HFD + L + 0.1SeNPs and HFD + L + 0.2SeNPs groups, treated the same as HFD + L group and orally gavaged SeNPs at daily doses of 0.1 and 0.2 mg/kg BW, respectively, during the last 14 day of the experiment. Daily determination of estrous cycle was performed, and at the end of the experimental period, BMI, serum glucose, insulin, HOMA-IR, lipid profile, sex hormones, TNF-α, IL6, oxidative stress biomarkers, ovarian mRNA expression of different proteins and enzymes involved in steroidogenesis, pathological examination, and immunohistochemical staining for androgen receptor (AR) were evaluated. Treatment of SeNPs restored estrous cyclicity, decreased BMI, and insulin resistance, improved dyslipidemia, reduced serum testosterone, and improved ovarian histopathology in PCOS rats. Furthermore, the anti-inflammatory and antioxidant impacts of SeNPs were remarkably noticed. Administration of SeNPs decreased androgen synthesis and expression of ovarian AR protein by decreasing the mRNA expression of STAR, Cyp11A1, Cyp17A1, and HSD17B3 and increasing the expression of Cyp19α1. Conclusively, SeNPs decreased androgen synthesis and blocked the vicious circle initiated by excessive androgen secretion via decreased AR expression. Thus, it may effectively treat PCOS cases by eliminating its reproductive, endocrine, and metabolic dysfunctions.
Collapse
Affiliation(s)
- Ahmed B E Abdallah
- Department of Physiology, Faculty of Medicine, Zagazig University, Zagazig, Egypt
| | | | - Azza A Hasan
- Department of Pharmaceutics, Faculty of Pharmacy, Zagazig University, Zagazig, Egypt
| | - Lamiaa G Mohammad
- Department of Physiology, Faculty of Medicine, Zagazig University, Zagazig, Egypt
| | - Noura M Mesalam
- Biological Applications Department, Nuclear Research Center, Egyptian Atomic Energy Authority, 13759, Cairo, Egypt.
| | - Radwa M Alsayed
- Department of Physiology, Faculty of Medicine, Zagazig University, Zagazig, Egypt
| |
Collapse
|
2
|
Das S, Choudhuri D. Dietary calcium regulates the risk renal injury in high fat diet induced obese rats by regulating renal lipid metabolism, oxidative stress and inflammation. Arch Physiol Biochem 2022; 128:1039-1049. [PMID: 32255372 DOI: 10.1080/13813455.2020.1746812] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
Abstract
CONTEXT The antiobesity effect of dietary calcium by preventing fat accumulation and weight gain was well established from several epidemiological and animal studies. OBJECTIVE To evaluate the effect of dietary calcium against obesity-associated with renal injury in high fat diet induced obese rats. Materials and Methods: Obesity was induced by high fat diet (HFD) and then given either low or high calcium HFD (0.25% and 1.0%) for another 30 days. RESULTS The results showed that 1.0% high calcium group was effective in reducing renal lipogenesis activity, lipid accumulation, fatty acid synthase (FAS) activity, acetyl coenzyme A carboxylase (ACC) expression, oxidative stress, inflammation and increased the adenosine monophosphate kinase (AMPK) expression. DISCUSSION AND CONCLUSION Downregulation of renal lipid accumulation by high calcium diet through AMPK mediated lipogenesis activity, oxidative stress and the inflammatory response seemed to prevent the renal injury in high fat diet (HFD) induced obese rats.
Collapse
Affiliation(s)
- Sandeep Das
- Reproductive Physiology and Endocrinology Laboratory, Department of Human Physiology, Tripura University (A Central University), Suryamaninagar, Agartala, India
| | - Dipayan Choudhuri
- Reproductive Physiology and Endocrinology Laboratory, Department of Human Physiology, Tripura University (A Central University), Suryamaninagar, Agartala, India
| |
Collapse
|
3
|
Chen P, Li S, Zhou Z, Wang X, Shi D, Li Z, Li X, Xiao Y. Liver fat metabolism of broilers regulated by Bacillus amyloliquefaciens TL via stimulating IGF-1 secretion and regulating the IGF signaling pathway. Front Microbiol 2022; 13:958112. [PMID: 35966703 PMCID: PMC9363834 DOI: 10.3389/fmicb.2022.958112] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2022] [Accepted: 06/30/2022] [Indexed: 11/29/2022] Open
Abstract
Bacillus amyloliquefaciens TL (B.A-TL) is well-known for its capability of promoting protein synthesis and lipid metabolism, in particular, the abdominal fat deposition in broilers. However, the underlying molecular mechanism remains unclear. In our study, the regulations of lipid metabolism of broilers by B.A-TL were explored both in vivo and in vitro. The metabolites of B.A-TL were used to simulate in vitro the effect of B.A-TL on liver metabolism based on the chicken hepatocellular carcinoma cell line (i.e., LMH cells). The effects of B.A-TL on lipid metabolism by regulating insulin/IGF signaling pathways were investigated by applying the signal pathway inhibitors in vitro. The results showed that the B.A-TL metabolites enhanced hepatic lipid synthesis and stimulated the secretion of IGF-1. The liver transcriptome analysis revealed the significantly upregulated expressions of four genes (SI, AMY2A, PCK1, and FASN) in the B.A-TL treatment group, mainly involved in carbohydrate digestion and absorption as well as biomacromolecule metabolism, with a particularly prominent effect on fatty acid synthase (FASN). Results of cellular assays showed that B.A-TL metabolites were involved in the insulin/IGF signaling pathway, regulating the expressions of lipid metabolism genes (e.g., FASN, ACCα, LPIN, and ACOX) and the FASN protein, ultimately regulating the lipid metabolism via the IGF/PI3K/FASN pathway in broilers.
Collapse
|
4
|
Skalny AV, Chang JS, Bobrovnitsky IP, Kopylov PY, Skalnaya MG, Huang SY, Paoliello MMB, Ivanova ES, Wang W, Tinkov AA. Relationship Between Elevated Hair Mercury Levels, Essential Element Status, and Metabolic Profile in Overweight and Obese Adults. Biol Trace Elem Res 2021; 199:2874-2881. [PMID: 33067716 DOI: 10.1007/s12011-020-02430-2] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/12/2020] [Accepted: 10/08/2020] [Indexed: 12/24/2022]
Abstract
The objective of the present study was to evaluate hair essential and trace element levels and metabolic risk markers in overweight and obese subjects in relation to body mercury burden. According to 2 × 2 factorial design a total of 440 adults were distributed to four groups: (i) low-Hg normal-weight subjects (n = 114); (ii) high-Hg normal weight subjects (n = 113); (iii) low-Hg overweight (BMI > 25) subjects (n = 110); (iv) high-Hg overweight (BMI > 25) subjects (n = 110). Hg-exposed groups consisted of subjects characterized by frequent seafood consumption (> 4 times/week) subsequently evaluated by hair analysis (> 0.58 μg/g). Dietary-exposed subjects were characterized by a more than 3-fold higher hair Hg content irrespectively of body weight values. Both low-Hg and high-Hg overweight subjects were characterized by significantly higher ALT activity, as well as elevated serum glucose, LDL, and triglyceride levels as compared to the respective groups of normal weight subjects. High Hg body burden had a more significant effect on metabolic parameters in overweight and obese adults. Particularly, high-Hg overweight subjects were characterized by significantly higher serum creatinine and uric acid levels, as well as increased GGT and CK activity as compared to low-Hg overweight counterparts. In addition, hair Mg, Mn, and Sr content in high-Hg overweight subjects was significantly lower than that in low-Hg normal weight and overweight examinees. In turn, high Hg levels in overweight subjects were associated with significantly higher hair Se and Zn levels when compared to unexposed overweight adults. Generally, the obtained data demonstrate that increased hair Hg levels in overweight and obese subjects is associated with adverse metabolic profile. It is proposed that observed metabolic alterations may be at least partially mediated by Hg-associated disturbances in essential trace element and mineral metabolism.
Collapse
Affiliation(s)
- Anatoly V Skalny
- I. M. Sechenov First Moscow State Medical University (Sechenov University), Moscow, 119146, Russia.
- Yaroslavl State University, Yaroslavl, 150000, Russia.
- ITMO University, St. Petersburg, 197101, Russia.
| | | | - Igor P Bobrovnitsky
- Centre for Strategic Planning, Russian Ministry of Health, 119435, Moscow, Russia
| | - Philippe Yu Kopylov
- I. M. Sechenov First Moscow State Medical University (Sechenov University), Moscow, 119146, Russia
| | | | | | - Monica Maria Bastos Paoliello
- Department of Molecular Pharmacology, Albert Einstein College of Medicine, Bronx, NY, 10461, USA
- Graduate Program in Public Health, Center of Health Sciences, State University of Londrina, Londrina, PR, 86038-350, Brazil
| | - Ekaterina S Ivanova
- National Medical Research Center for Therapy and Preventive Medicine of the Ministry of Health of Russia, Moscow, Russia
| | - Weu Wang
- Taipei Medical University, Taipei, Taiwan
| | - Alexey A Tinkov
- I. M. Sechenov First Moscow State Medical University (Sechenov University), Moscow, 119146, Russia
- Yaroslavl State University, Yaroslavl, 150000, Russia
| |
Collapse
|
5
|
Das S, Choudhuri D. Calcium supplementation shows a hepatoprotective effect against high-fat diet by regulating oxidative-induced inflammatory response and lipogenesis activity in male rats. J Tradit Complement Med 2019; 10:511-519. [PMID: 32953568 PMCID: PMC7484968 DOI: 10.1016/j.jtcme.2019.06.002] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2018] [Revised: 05/28/2019] [Accepted: 06/01/2019] [Indexed: 12/30/2022] Open
Abstract
Background and aim High-fat diet (HFD) triggers obesity-related metabolic diseases like non-alcoholic fatty liver diseases (NAFLD). Calcium supplementation is known to have an anti-obesity effect. However, the effect of calcium supplementation has not been evaluated so far in context to hepatic functions on exposure to HFD. The goal of the present study was to investigate the role of calcium supplementation on hepatic function and other physiological markers in HFD induced NAFLD rats. Experimental procedure 18 male Wistar rats were divided into two groups; first group considered control group (n = 6) for the entire treatment period and the second group (n = 12) fed with HFD for 6 weeks to induce NAFLD model and then sub-divided into two groups (n = 6 rats); one group received HFD and other group received 1.0 gm CaCO3/100 gm HFD for 30 days. After treatment, all animals were euthanized to collect the blood and liver for biochemical, enzymatic, oxidative, anti-oxidant, western blot and histological study. Results and conclusion Calcium supplementation significantly improved the anthropometric parameters and decreases the level of serum cholesterol, triglyceride, FFA and hepatic enzymes. Calcium supplementation significantly down-regulated the hepatic PPAR-γ mediated FAS activity, hepatic lipid accumulation, oxidative stress and restored the activities of antioxidant enzyme which further prevented the stimulation of pro-inflammatory response. Calcium supplementation also increases the hepatic protein expression of phosphorylated AMP-activated protein kinase. So, calcium supplementation showed a hepatoprotective effect during NAFLD by downregulating the oxidative induced inflammatory response stimulated by hepatic lipogenesis activity and subsequent lipid accumulation. Calcium supplementation improves the anthropometric changes, lipid profile and hepatic enzymatic activities induced by HFD. Calcium supplementation up-regulated AMPK activity and down regulated PPAR-γ activity. Hepatic lipogenesis activity and lipid accumulation was down regulated by calcium supplementation through inhibition of FAS activity. Hepatic anti-oxidant and oxidative balance was restored on exposure to calcium supplementation. Down regulation of hepatic oxidative stress prevents the activation of hepatic inflammatory makers.
Collapse
Affiliation(s)
- Sandeep Das
- Department of Human Physiology, Tripura University (A Central University), Suryamaninagar, Agartala, Tripura, 799022, India
| | - Dipayan Choudhuri
- Department of Human Physiology, Tripura University (A Central University), Suryamaninagar, Agartala, Tripura, 799022, India
| |
Collapse
|
6
|
Fernández-Calleja JMS, Bouwman LMS, Swarts HJM, Oosting A, Keijer J, van Schothorst EM. Direct and Long-Term Metabolic Consequences of Lowly vs. Highly-Digestible Starch in the Early Post-Weaning Diet of Mice. Nutrients 2018; 10:E1788. [PMID: 30453616 PMCID: PMC6265974 DOI: 10.3390/nu10111788] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2018] [Revised: 11/09/2018] [Accepted: 11/14/2018] [Indexed: 01/26/2023] Open
Abstract
Starches of low and high digestibility have different metabolic effects. Here, we examined whether this gives differential metabolic programming when fed in the immediate post-weaning period. Chow-fed mice were time-mated, and their nests were standardized and cross-fostered at postnatal days 1⁻2. After postnatal week (PW) 3, individually housed female and male offspring were switched to a lowly-digestible (LDD) or highly-digestible starch diet (HDD) for three weeks. All of the mice received the same high-fat diet (HFD) for nine weeks thereafter. Energy and substrate metabolism and carbohydrate fermentation were studied at the end of the HDD/LDD and HFD periods by extended indirect calorimetry. Glucose tolerance (PW 11) and metabolic flexibility (PW14) were analyzed. Directly in response to the LDD versus the HDD, females showed smaller adipocytes with less crown-like structures in gonadal white adipose tissue, while males had a lower fat mass and higher whole body fat oxidation levels. Both LDD-fed females and males showed an enlarged intestinal tract. Although most of the phenotypical differences disappeared in adulthood in both sexes, females exposed to LDD versus HDD in the early post-weaning period showed improved metabolic flexibility in adulthood. Cumulatively, these results suggest that the type of starch introduced after weaning could, at least in females, program later-life health.
Collapse
Affiliation(s)
| | - Lianne M S Bouwman
- Human and Animal Physiology, Wageningen University, De Elst 1, Wageningen 6708 WD, The Netherlands.
| | - Hans J M Swarts
- Human and Animal Physiology, Wageningen University, De Elst 1, Wageningen 6708 WD, The Netherlands.
| | - Annemarie Oosting
- Danone Nutricia Research, Uppsalalaan 12, Utrecht 3584 CT, The Netherlands.
| | - Jaap Keijer
- Human and Animal Physiology, Wageningen University, De Elst 1, Wageningen 6708 WD, The Netherlands.
| | - Evert M van Schothorst
- Human and Animal Physiology, Wageningen University, De Elst 1, Wageningen 6708 WD, The Netherlands.
| |
Collapse
|
7
|
Shojaei Zarghani S, Abbaszadeh S, Alizadeh M, Rameshrad M, Garjani A, Soraya H. The Eeffect of Metformin Combined with Calcium-Vitamin D 3 Against Diet-Induced Nonalcoholic Fatty Liver Disease. Adv Pharm Bull 2018; 8:97-105. [PMID: 29670844 PMCID: PMC5896400 DOI: 10.15171/apb.2018.012] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2017] [Revised: 01/24/2018] [Accepted: 02/06/2018] [Indexed: 01/21/2023] Open
Abstract
Purpose: Metformin is one of the most popular drugs tested against nonalcoholic fatty liver disease (NAFLD). The present study aimed to investigate whether calcium-vitamin D3 cosupplementation will intensify the effect of metformin on the prevention of high-fat, high-fructose (HFFr) diet-induced hepatic steatosis. Methods: Male wistar rats (210±16 g) were assigned into the following seven groups: a Control group to receive a standard chow and six HFFr-fed groups to receive diets containing either normal (0.5% calcium and 1000 IU/kg vitamin D3) or high amount of calcium and vitamin D3 (2.4% calcium and 10000 IU/kg vitamin D3) (CaD), in combination with gastric gavage administration of either saline or 25 or 200 mg/kg body weight/day metformin. After 60 days, rats were assessed with respect to their anthropometric, metabolic and hepatic parameters, as well as their hepatic AMP-activated protein kinase (AMPK) phosphorylation. Results: Metformin and CaD, either alone or in combination, caused a significant reduction in HFFr diet-induced high serum aspartate aminotransferase (AST), hepatic steatosis and lipid accumulation without effect on insulin resistance and AMPK phosphorylation. In addition, slightly (and non-significantly) better effects of the combination in ameliorating steatosis and hepatic cholesterol content were observed. Conclusion: Taken together, our results suggest that metformin and CaD could protect against the onset of HFFr diet-induced NAFLD in an insulin and AMPK-independent manner, without any marked additional benefits of their combination.
Collapse
Affiliation(s)
| | - Samin Abbaszadeh
- Cellular and Molecular Research Center, Department of Pharmacology, Faculty of Pharmacy, Urmia University of Medical Sciences, Urmia, Iran
| | - Mohammad Alizadeh
- Department of Nutrition, Food and Beverages Safety Research Center, Faculty of Medicine, Urmia University of Medical Sciences, Urmia, Iran
| | - Maryam Rameshrad
- Department of Pharmacology and Toxicology, Faculty of Pharmacy, Tabriz University of Medical Sciences, Tabriz, Iran
| | - Alireza Garjani
- Department of Pharmacology and Toxicology, Faculty of Pharmacy, Tabriz University of Medical Sciences, Tabriz, Iran
| | - Hamid Soraya
- Cellular and Molecular Research Center, Department of Pharmacology, Faculty of Pharmacy, Urmia University of Medical Sciences, Urmia, Iran
| |
Collapse
|
8
|
Calcium and vitamin D3 combinations improve fatty liver disease through AMPK-independent mechanisms. Eur J Nutr 2016; 57:731-740. [DOI: 10.1007/s00394-016-1360-4] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2016] [Accepted: 12/06/2016] [Indexed: 02/06/2023]
|
9
|
Li H, Li C, Zhang C, Chen B, Hui L, Shen Y. Compositional and gastrointestinal prokinetic studies of Pugionium (L.). Food Chem 2015; 186:285-91. [PMID: 25976823 DOI: 10.1016/j.foodchem.2015.03.146] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2015] [Revised: 03/25/2015] [Accepted: 03/28/2015] [Indexed: 12/22/2022]
Abstract
Pugionium cornutum (L.) Gaertn. (PCG) is a desert plant with edible and medicinal value. The contents of proximate composition, amino acids and vitamins of fresh and pickled PCG were analyzed. PCG is rich in dietary fiber, protein and vitamins. PCG is a dietary source of potassium and calcium, with low levels of fat and sugar. PCG contains all the 18 hydrolyzed amino acids. Pickled PCG protein is a high quality protein. A large quantity of vitamins are lost during the pickling process. The type and number of mice dejections, gastric emptying and intestinal propulsion were investigated using the water extract of fresh and pickled PCG (WEFP and WEPP) to determine their gastrointestinal prokinetic efficacy. The low-dose WEFP and WEPP promoted the gastrointestinal dynamics and the WEFP and WEPP promoted gastrointestinal activity and act as nonviolent drugs. The results indicate that PCG has great potential as a new functional food source.
Collapse
Affiliation(s)
- Haoyu Li
- Key Laboratory of Synthetic and Natural Functional Molecule Chemistry of Ministry of Education, College of Chemistry and Materials Science, Northwest University, Shaanxi Alcohol Ether and Biomass Energy Engineering Research Center, Key Laboratory of Yulin Desert Plants Resources, 229 Taibai North Road, Xi'an 710069, PR China
| | - Cong Li
- Key Laboratory of Synthetic and Natural Functional Molecule Chemistry of Ministry of Education, College of Chemistry and Materials Science, Northwest University, Shaanxi Alcohol Ether and Biomass Energy Engineering Research Center, Key Laboratory of Yulin Desert Plants Resources, 229 Taibai North Road, Xi'an 710069, PR China
| | | | - Bang Chen
- Key Laboratory of Synthetic and Natural Functional Molecule Chemistry of Ministry of Education, College of Chemistry and Materials Science, Northwest University, Shaanxi Alcohol Ether and Biomass Energy Engineering Research Center, Key Laboratory of Yulin Desert Plants Resources, 229 Taibai North Road, Xi'an 710069, PR China
| | - Lang Hui
- College of Life Science, Northwest University, PR China
| | - Yehua Shen
- Key Laboratory of Synthetic and Natural Functional Molecule Chemistry of Ministry of Education, College of Chemistry and Materials Science, Northwest University, Shaanxi Alcohol Ether and Biomass Energy Engineering Research Center, Key Laboratory of Yulin Desert Plants Resources, 229 Taibai North Road, Xi'an 710069, PR China.
| |
Collapse
|
10
|
Huang Y, Liu T, Sun C. Little beneficial effect of maternal vitamin supplement on metabolic disturbances in the offspring from the obese mother mice. J Matern Fetal Neonatal Med 2014; 28:272-5. [DOI: 10.3109/14767058.2014.913133] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
|
11
|
Low dietary calcium and obesity: a comparative study in genetically obese and normal rats during early growth. Eur J Nutr 2013; 53:769-78. [PMID: 24061348 DOI: 10.1007/s00394-013-0581-z] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2013] [Accepted: 08/27/2013] [Indexed: 02/08/2023]
Abstract
PURPOSE A low calcium intake (LCaI) may predispose to obesity, and excessive fat mass may be detrimental to bone. The impact of Ca inadequacy would be greater in subjects predisposed to obesity. LCaI effect on obesity development during the rapid growth period was compared in two strains of rats: spontaneously obese IIMb/β (O) and Wistar (W). Pregnant rats were fed 0.5% (N) or 0.2% (L) of Ca (OLCa, ONCa, WLCa and WNCa). Male pups were fed the maternal diet until day 60. METHODS Body composition, lipid profile, glucose homeostasis, 25 hydroxyvitamin D, Ca-phosphorus, and bone metabolism were evaluated. RESULTS BW and body fat were higher, whereas body protein was lower in OLCa versus ONCa (p < 0.05). OLCa presented the highest body fat, glucose, non-HDL and total cholesterol, TGL, insulin levels, and HOMA-IR, liver weight, and adipose perigonadal plus retroperitoneal pads (p < 0.05). WLCa did not exhibit an increase BW and only showed a slight change in body composition with minor biochemical alterations compared to WNCa (p < 0.05). Osteocalcin, CTX, and proximal tibia and lumbar spine BMDs were lower in O than in W rats fed the same Ca diet (p < 0.05). Body ash and Ca content, and total skeleton BMC/BW were lower in OLCa and WLCa versus their corresponding NCa groups (p < 0.05). CONCLUSION The negative effect of a low Ca diet on fat mass accumulation and lipid profile may be more evident in rats predisposed to obesity. Nevertheless, low CaI interferes with the normal glucose homeostasis leading to an increase in insulin resistance. Low CaI during early growth may be an obesogenic factor that may persist into adult life and may account for the development of obesity and some of its co-morbidities.
Collapse
|