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Sanapo L, Bublitz MH, Bai A, Mehta N, Messerlian GM, Catalano P, Bourjeily G. Association between sleep disordered breathing in early pregnancy and glucose metabolism. Sleep 2022; 45:zsab281. [PMID: 34999843 PMCID: PMC8996028 DOI: 10.1093/sleep/zsab281] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [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: 04/09/2021] [Revised: 12/12/2021] [Indexed: 08/26/2023] Open
Abstract
STUDY OBJECTIVES To examine the association between maternal sleep disordered breathing (SDB) and glucose metabolism in early gestation. METHODS Women with body mass index (BMI) ≥27 kg/m2 and singleton pregnancies underwent in-home sleep study (HSAT) and homeostatic model assessment (HOMA) in early pregnancy. Insulin resistance (HOMA-IR) and β-cell function (HOMA %B) were derived. Exclusion criteria included pregestational diabetes, use of continuous positive airway pressure and chronic steroid therapy. We performed linear regression analyses to evaluate the association between continuous measures of SDB (respiratory event index (REI), and oxygen desaturation index (ODI)) and glucose metabolism parameters (HOMA-IR and HOMA %B). Analyses were adjusted for a set of a priori selected variables which included gestational age, maternal age, BMI, ethnicity, race, and parity. RESULTS One hundred and ninety-two pregnant women with median (interquartile range) BMI of 35.14 (8.30) kg/m2 underwent HSAT and HOMA assessment at 11.14 (3) and 15.35 (4.14) gestational weeks, respectively. REI and ODI, as continuous values, were associated with HOMA-IR after adjusting for covariates. OSA (obstructive sleep apnea) diagnosis (REI > 5 events per hour) was not associated with HOMA-IR after adjusting for BMI (p ≥ 0.05). None of the parameters were associated with HOMA %B (p > 0.07). CONCLUSIONS SDB and insulin resistance are associated in early pregnancy, with a dose response association between respiratory event index severity and insulin resistance. Further studies are needed to establish if pregnant women with overweight and obesity may benefit from early SDB screening to improve glucose metabolic outcome. Clinical trials: NCT02412696, Positive Airway Pressure, Sleep Apnea, and the Placenta (PAP-SAP) https://clinicaltrials.gov/ct2/show/NCT02412696?term=Bourjeily&draw=2&rank=2 and NCT02917876, Predictors of De-novo Development of Obstructive Sleep Apnea in Pregnancy (Predictors) https://clinicaltrials.gov/ct2/show/NCT02917876?term=Bourjeily&draw=2&rank=1.
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Affiliation(s)
- Laura Sanapo
- Women’s Medicine Collaborative, The Miriam Hospital, Providence, RI, USA
- Department of Medicine, Warren Alpert School of Medicine at Brown University, Providence, RI, USA
| | - Margaret H Bublitz
- Women’s Medicine Collaborative, The Miriam Hospital, Providence, RI, USA
- Department of Medicine, Warren Alpert School of Medicine at Brown University, Providence, RI, USA
- Department of Psychiatry and Human Behavior, Warren Alpert School of Medicine at Brown University, Providence, RI, USA
| | - Alice Bai
- Brown University, Providence, RI, USA
| | - Niharika Mehta
- Women’s Medicine Collaborative, The Miriam Hospital, Providence, RI, USA
- Department of Medicine, Warren Alpert School of Medicine at Brown University, Providence, RI, USA
| | - Geralyn M Messerlian
- Departments of Pathology and Laboratory Medicine and Obstetrics and Gynecology, Women and Infants Hospital, Brown University, Providence, RI, USA
| | - Patrick Catalano
- Mother Infant Research Institute, Department of Obstetrics and Gynecology, Tufts University School of Medicine, Friedman School of Nutrition Science and Policy, Boston, MA, USA
| | - Ghada Bourjeily
- Women’s Medicine Collaborative, The Miriam Hospital, Providence, RI, USA
- Department of Medicine, Warren Alpert School of Medicine at Brown University, Providence, RI, USA
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2
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Stead T, Bai A, Rajachandran S, Glueck J, Barbera A. Salter Harris Fracture Type II. Orthop Rev (Pavia) 2022; 14:32319. [DOI: 10.52965/001c.32319] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
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3
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Bai A, Belda O, Dosanjh A. Pulmonary Nontuberculous Mycobacterial Infection in Infants: A Systematic Review. Pediatric Health Med Ther 2021; 12:551-559. [PMID: 35002357 PMCID: PMC8721029 DOI: 10.2147/phmt.s332434] [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] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2021] [Accepted: 11/26/2021] [Indexed: 01/15/2023] Open
Abstract
Limited information and literature exist examining pulmonary infections caused by nontuberculous mycobacterial specifically in an infant population. The objective of our study was to summarize clinical characteristics and outcomes of infant patients with nontuberculous mycobacterial pulmonary infection via systematic literature review to identify common diagnostic and treatment regimens for this infection in infants. A search of MEDLINE and PubMed databases in October 2019 using MeSH search terms “infant,” “NTM,” “pulmonary,” and “Mycobacterium abscessus” yielded 139 articles. Inclusion criteria were i) English-language studies including cases and case series with ii) established nontuberculous mycobacterial pulmonary infection in iii) a patient population of infants no older than 24 months. Patients with cystic fibrosis and any study which did not contain relevant information such as infection and age were excluded. This yielded data on 37 patients extracted from 28 studies analyzed. The most common strain was Mycobacterium avium complex, isolated in 56.8% of patient diagnoses. Bronchoscopy/thoracoscopy with a subsequent culture were the most common diagnostic techniques, utilized in 64.9% of cases. Drug therapeutic treatment was utilized in 86% of cases, with a median of three drugs administered. Notable limitations of this study are the small sample size and its retrospective nature, which relies on information reported in previous case studies. Although there is limited formal clinician consensus on the treatment of NTM pulmonary infection and how it may differ in an infant population, our findings indicate an informal consensus typically involving diagnostic lung specimen culture and antibiotic therapy.
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Affiliation(s)
- Alice Bai
- Brown University, Providence, RI, USA
- Correspondence: Alice Bai Brown University, 69 Brown St. Mail# 5288, Providence, RI, 02912, USATel +1 770 843-2062 Email
| | | | - Amrita Dosanjh
- Pediatric Respiratory, Affiliated Staff Member, Department of Pediatrics, Rady Children’s Hospital, San Diego, CA, USA
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Bai A, Shi H, Huang X, Xu W, Deng Y. Association of C-Reactive Protein and Motoric Cognitive Risk Syndrome in Community-Dwelling Older Adults: The China Health and Retirement Longitudinal Study. J Nutr Health Aging 2021; 25:1090-1095. [PMID: 34725666 DOI: 10.1007/s12603-021-1678-3] [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] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Abstract
OBJECTIVES Motoric cognitive risk syndrome (MCR) is a newly described pre-dementia syndrome characterized by cognitive complaints and slow gait and is associated with numerous adverse outcomes. Previous studies have indicated an association between C-reactive protein (CRP) and cognitive decline, but no clear relationship between CRP and MCR has been reported. The purpose of the study is to examine the associations between CRP with MCR and MCR subtypes. METHODS Participants were 5,642 adults aged ≥60 years from the China Health and Retirement Longitudinal Study (CHARLS). MCR was defined as cognitive complaints and slow gait speed without dementia or impaired mobility. Two subtypes of MCR were defined by whether memory impairment (MI) was also present, such as MCR-MI and MCR-non-MI. MI was evaluated through the immediate recall and delayed recall in a word recall test during the CHARLS and was defined as 1.0 standard deviation or more below the mean values of the test scores in this cohort. RESULTS Of the participants, 421 (7.46%) met the criteria for MCR. After multivariate adjustment, participants with higher CRP levels had an increased likelihood of MCR (fourth quartile: adjusted odds ratio [OR]=1.44; 95% confidence interval [CI]: 1.06-1.95) compared with those in the first quartile group. The OR for MCR-MI was 2.04 (95% CI: 1.35-3.09) for the highest quartile of CRP compared to the lowest quartile. No significant associations between CRP levels and odds of MCR-non-MI were observed. CONCLUSIONS Higher CRP levels were associated with increased odds of prevalent MCR-MI but not MCR-non-MI among community-dwelling older adults.
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Affiliation(s)
- A Bai
- Yujiao Deng, Department of Ultrasound, The First Medical Center of Chinese PLA General Hospital, Beijing, China, E-mail: ; Weihao Xu, Haikou Cadre's sanitarium of Hainan Military Region, Haikou, China, E-mail:
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5
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Tang HB, Ouyang K, Rao GB, Ma L, Zhong H, Bai A, Qin S, Chen F, Lin J, Cao Y, Liao YJ, Zhang J, Wu J. Characterization of Complete Genome Sequences of a Porcine Endogenous Retrovirus Isolated From China Bama Minipig Reveals an Evolutionary Time Earlier Than That of Isolates From European Minipigs. Transplant Proc 2016; 48:222-8. [PMID: 26915872 DOI: 10.1016/j.transproceed.2015.12.005] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2015] [Accepted: 12/10/2015] [Indexed: 10/22/2022]
Abstract
BACKGROUND A porcine endogenous retroviruses (PERV) isolate, PERV-A-BM, was isolated from a Guangxi Bama minipig in China. METHODS To understand its genetic variation and evolution, the complete PERV-A-BM genome sequences were determined and compared with isolates from different Sus scrofa breeds and porcine cell lines. A total of 69 nucleotide substitutions were found in the full-length genome, including 26 non-synonymous mutations. RESULTS Phylogenetic trees based on the complete genome sequence as well as the gag, pol, and env gene sequences from 21 PERV isolates demonstrated that the PERV-A-BM was closely related to the EF133960 isolate from Chinese Wuzhishan miniature pigs inbred in Hainan, China, and distantly related to strains isolated from European-born pigs. CONCLUSIONS The estimation of age in the proviral PERV-A-BM integrating into the host genome reveals that the age of PERV-A-BM is at least 8.3 × 10(6) years, an evolutionary time earlier than that of isolates from European-born pigs.
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Affiliation(s)
- H-B Tang
- Guangxi Veterinary Research Institute, Nanning, Guangxi, China
| | - K Ouyang
- Guangxi Veterinary Research Institute, Nanning, Guangxi, China
| | - G-B Rao
- Guangxi Veterinary Research Institute, Nanning, Guangxi, China
| | - L Ma
- Guangxi Veterinary Research Institute, Nanning, Guangxi, China
| | - H Zhong
- School of Marine Sciences and Biotechnology, Guangxi University for Nationalities, Nanning, China
| | - A Bai
- Guangxi Veterinary Research Institute, Nanning, Guangxi, China
| | - S Qin
- Guangxi Veterinary Research Institute, Nanning, Guangxi, China
| | - F Chen
- Guangxi Veterinary Research Institute, Nanning, Guangxi, China
| | - J Lin
- Guangxi Veterinary Research Institute, Nanning, Guangxi, China
| | - Y Cao
- Guangxi Veterinary Research Institute, Nanning, Guangxi, China
| | - Y-J Liao
- School of Marine Sciences and Biotechnology, Guangxi University for Nationalities, Nanning, China
| | - J Zhang
- Laboratory for Viral Safety of National Centre of Biomedical Analysis, Institute of Transfusion Medicine, The Academy of Military Medical Sciences, Beijing, China
| | - J Wu
- Guangxi Veterinary Research Institute, Nanning, Guangxi, China.
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Wang D, Bai A, Lin X, Fang L, Shu X, Shi X, Sun Q, Wang X. Efficient method for extraction and isolation of shionone fromAster tataricusL. f. by supercritical fluid extraction and high-speed counter-current chromatography. ACTA CHROMATOGR 2012. [DOI: 10.1556/achrom.24.2012.4.8] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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Bai A, Meetze K, Vo N, Kollipara S, Mazsa E, Winston W, Weiler S, Lerner L, Gyuris J, Weng Z. 230 Essential role of fibroblast growth factor receptor 2 (FGFR2) in tumorigenesis of human cancers harboring FGFR2 amplification demonstrated by a functional blocking antibody. EJC Suppl 2010. [DOI: 10.1016/s1359-6349(10)71935-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022] Open
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8
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Abstract
Inflammatory bowel disease (IBD) is characterized by heavy production of proinflammatory cytokines such as tumour necrosis factor (TNF)-alpha and interleukin (IL)-1beta. Interactions of the autonomic nervous system with local immune cells play an important role in the development of IBD, and the balance of autonomic nerve function is broken in IBD patients with sympathetic overactivity. However, the function of catecholamines in the progress of colitis is unclear. In this study, we examined the role of catecholamines via alpha2-adrenoreceptor in acute murine colitis. The expression of tyrosine hydroxylase (TH) and dopamine b-hydroxylase (DBH), two rate-limiting enzymes in catecholamine synthesis, was detected by immunohistochemistry in murine colitis. Murine colitis was induced by dextran sodium sulphate or trinitrobenzene sulphonic acid (TNBS), and the mice were administered RX821002 or UK14304, alpha2-adrenoceptor antagonists or agonists. Colitis was evaluated by clinical symptoms, myeloperoxidase assay, TNF-alpha and IL-1beta production and histology. Lamina propria mononuclear cells (LPMCs) from mice with TNBS colitis were cultured in the absence or presence of RX821002 or UK14304, and stimulated further by lipopolysaccharide. TH and DBH are induced in LPMCs of inflamed colon, the evidence of catecholamine synthesis during the process of colitis. RX821002 down-regulates the production of proinflammatory cytokines from LPMCs, while UK14304 leads to exacerbation of colitis. Together, our data show a critical role of catecholamines via alpha2-adrenoreceptors in the progress of acute colitis, and suggest that use of the alpha2-adrenoceptor antagonist represents a novel therapeutic approach for the management of colitis.
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Affiliation(s)
- A Bai
- Department of Gastroenterology, The First Affiliated Hospital, Nanchang University, Nanchang City, China.
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9
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Abstract
Inflammatory bowel diseases (IBD) are characterized by proinflammatory cytokines, tissue damage and loss of neuron in inflamed mucosa, which implies the cholinergic anti-inflammatory pathway may be destroyed during the process of inflammatory response. In the study, we identified the effect of cholinergic agonist as anabaseine (AN) and nicotinic receptor antagonist as chlorisondamine diiodide (CHD) on trinitrobenzene sulfonic acid (TNBS)-induced colitis, to investigate the potential therapeutic effect of the cholinergic anti-inflammatory pathway on IBD. Experimental colitis was induced by TNBS at day 1, 10 mug AN or 1.5 mug CHD was injected i.p. to mouse right after the induction of colitis, and repeated on interval day till the mice were sacrificed at day 8. Colonic inflammation was examined by histological analysis, myeloperoxidase (MPO) activity, and the production of tumour necrosis factor (TNF)-alpha in tissue. Lamina propria mononuclear cells (LPMC) were isolated, and NF-kappaB activation was detected by western blot. The mice with colitis treated by AN showed less tissue damage, less MPO activity, less TNF-alpha production in colon, and inhibited NF-kappaB activation in LPMC, compared with those mice with colitis untreated, whereas the mice with colitis treated by CHD showed the worst tissue damage, the highest MPO activity, the highest TNF-alpha level, and enlarged NF-kappaB activation in LPMC. Agonist of the cholinergic anti-inflammatory pathway inhibits colonic inflammatory response by downregulating the production of TNF-alpha, and inhibiting NF-kappaB activation, which suggests that modulating the cholinergic anti-inflammatory pathway may be a new potential management for IBD.
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Affiliation(s)
- A Bai
- Department of Gastroenterology, the First Affiliated Hospital, Nanchang University, Nanchang City, China
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10
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Abstract
Two triterpenes 21R,23R-epoxy-21alpha-ethoxy-24S,25-dihydroxyapotirucall-7-en-3-one and 24R-acetoxy-3beta,25-dihydroxycycloartane were isolated from the leaves of Dysoxylum malabaricum together with eight known compounds lupeone, lupeol. sitosterol, dipterocarpol, cycloart-25-ene-3beta,24-diol, 24R,25-dihydroxycycloartan-3-one, 3beta,24R,25-trihydroxycycloartane and ergosta-5,24(24(1))-diene-3beta,4beta,20S-triol. The complete 1H and 13C NMR spectral assignment of the new apotirucallene triterpenoid has been achieved by 1H-1H COSY, HMQC and HMBC experiments.
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Affiliation(s)
- A Hisham
- Department of Chemistry, College of Science, Sultan Qaboos University, Al-khode, Oman.
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12
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Abstract
Many leader-derived peptides require TAP for presentation by class I molecules. This TAP dependence can either be ascribed to the inability of proteases resident in the endoplasmic reticulum (ER) to trim leader peptide precursors into the appropriate epitope or the failure of a portion of the leader segment to gain access to the lumen of the ER. Using the Qa-1 binding epitope, Qdm derived from a class Ia leader as a model, we show that many cell types lack ER protease activity to trim this peptide at its C terminus. However, both T1 and T2 cells contain appropriate protease activity to process the full length D(d) leader (DL) when introduced into the ER lumen. Nevertheless, both T1 cells treated with the TAP inhibitor ICP47 and TAP(-) T2 cells fail to present this epitope from either the intact D(d) molecule or a minigene encoding the DL. This indicates that the portion of the leader containing Qdm does not gain access to the ER. However, changing the Arg at P7 of the DL to a Cys can alter its trafficking and allows for TAP-independent presentation of the Qdm epitope.
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Affiliation(s)
- A Bai
- Center for Immunology and Immunology Graduate Program, University of Texas Southwestern Medical Center, Dallas, TX 75235, USA
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13
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Abstract
The class Ib molecule Qa-1(b) binds the class Ia leader peptide, Qdm, which reacts with CD94/NKG2R on NK cells. We have generated a gene that encodes the Qdm peptide covalently attached to ss(2)-microglobulin (ss(2)M) by a flexible linker (Qa-1 determinant modifier (Qdm)-ss(2)M). When this construct is expressed in TAP-2(-) or ss(2)M(-) cells, it allows for the expression of a Qdm-ss(2)M protein that associates with Qa-1(b) to generate the Qdm epitope, as detected by Qdm/Qa-1(b)-specific CTL. To test the biological significance of expression of this engineered molecule, we injected TAP-2(-) RMAS-Qdm-ss(2)M cells into C57BL/6 mice and measured their NK cell-mediated clearance from the lungs at 2 h. RMAS cells transfected with Qdm-ss(2)M were resistant to lung clearance, similar to RMA cells or RMAS cells in anti-asialo-GM(1)-treated mice, while untransfected or ss(2)M-transfected RMAS cells were rapidly cleared. Further, pulsing RMAS cells with either Qdm, a K(b)-, or D(b)-binding peptide showed equivalent protection from clearance, indicating that a single class Ia or Ib molecule can afford complete protection from NK cells in this system. In contrast, injection of RMAS cells into DBA/2 animals, which express low levels of receptors for Qdm/Qa-1(b), resulted in protection from lung clearance if pulsed with a K(b)- or D(b)-binding peptide, but not the Qa-1(b)-binding peptide, Qdm.
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MESH Headings
- Animals
- Biomarkers
- Cell Membrane/genetics
- Cell Membrane/immunology
- Cell Membrane/metabolism
- Cytotoxicity Tests, Immunologic
- Cytotoxicity, Immunologic/immunology
- Gene Expression Regulation/immunology
- Genetic Vectors/chemical synthesis
- H-2 Antigens/biosynthesis
- H-2 Antigens/immunology
- Histocompatibility Antigen H-2D
- Histocompatibility Antigens Class I/biosynthesis
- Histocompatibility Antigens Class I/genetics
- Histocompatibility Antigens Class I/immunology
- Histocompatibility Antigens Class I/metabolism
- Humans
- Killer Cells, Natural/immunology
- Killer Cells, Natural/metabolism
- Mice
- Mice, Inbred BALB C
- Mice, Inbred C57BL
- Mice, Inbred DBA
- Peptides/genetics
- Peptides/metabolism
- Receptors, Immunologic/biosynthesis
- Receptors, KIR
- Transfection
- Tumor Cells, Cultured/immunology
- Tumor Cells, Cultured/metabolism
- beta 2-Microglobulin/biosynthesis
- beta 2-Microglobulin/chemical synthesis
- beta 2-Microglobulin/genetics
- beta 2-Microglobulin/metabolism
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Affiliation(s)
- S H Jia
- Center for Immunology, University of Texas Southwestern Medical Center, Dallas, TX 75390, USA
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Kojima H, Bai A, Mukai HY, Hori M, Komeno T, Hasegawa Y, Ninomiya H, Mori N, Nagasawa T. Chronic myelomonocytic leukemia derived from a possible common progenitor of monocytes and natural killer cells. Leuk Lymphoma 2000; 37:617-21. [PMID: 11042523 DOI: 10.3109/10428190009058515] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
The neural cell adhesion molecule, CD56, is expressed on acute myelogenous leukemia (AML) cells in 17-20% of the patients. However, the clinical and biological significance of its expression in AML has not been well analyzed from the standpoint of CD56 expression and its association with differentiation to a natural killer (NK) cell lineage. Here we present a 78-year-old patient with chronic myelomonocytic leukemia (CMML) whose leukemic cells had features of both monocytes and NK cells. We demonstrated that the leukemic cells were positive for CD4, CD56 and interleukin-2 (IL-2) receptor beta chain (CD112) in addition to myelomonocytic markers such as CD33, CD11b and CD11c. These leukemic cells proliferated well in vitro in response to 10-100 U/ml of IL-2, and functionally showed significant cytotoxicity against K562 target cells in a 4-hour (51) Cr release assay. All the above data indicate that these cells possessed at least some of the biological features of NK cells. Accordingly, we speculate that the leukemic cells in this patient may have been derived from a possible common progenitor of monocytes and NK cells.
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MESH Headings
- Aged
- Antigens, CD/analysis
- Antigens, Differentiation, Myelomonocytic/analysis
- Antigens, Neoplasm/analysis
- Biomarkers, Tumor/analysis
- CD11b Antigen/analysis
- CD11c Antigen/analysis
- CD4 Antigens/analysis
- CD56 Antigen/analysis
- Cell Lineage
- Cytotoxicity, Immunologic
- Fatal Outcome
- Hematopoietic Stem Cells/chemistry
- Hematopoietic Stem Cells/pathology
- Humans
- Immunophenotyping
- Interleukin-2 Receptor beta Subunit
- K562 Cells
- Killer Cells, Natural/chemistry
- Killer Cells, Natural/pathology
- Leukemia, Myelomonocytic, Chronic/pathology
- Male
- Monocytes/chemistry
- Monocytes/pathology
- Neoplastic Stem Cells/chemistry
- Neoplastic Stem Cells/pathology
- Receptors, Interleukin/analysis
- Sialic Acid Binding Ig-like Lectin 3
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Affiliation(s)
- H Kojima
- Division of Hematology, Institute of Clinical Medicine, University of Tsukuba. Tsukuba, Ibaraki, 305-8575, Japan.
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15
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Hasegawa Y, Bai A, Kojima H, Komeno T, Ninomiya H, Nagasawa T. Priming effects of macrophage colony-stimulating factor on monocytic leukemia cells in combination with chemotherapy: induction of programmed cell death in vivo. Leuk Lymphoma 2000; 36:589-93. [PMID: 10784404 DOI: 10.3109/10428190009148407] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
Two elderly patients with chronic myelomonocytic leukemia were treated with cytosine arabinoside (Ara-C) and aclarubicin (ACR) under simultaneous administrations of macrophage colony-stimulating factor (M-CSF) (CAM), and both obtained good responses. Examination of apoptosis using flow cytometry revealed induction of apoptotic death of leukemia cells by CAM in Patient 2, while neither induction of apoptotic death of leukemia cells nor clinical response were seen with CAG (Ara-C, ACR, and granulocyte colony-stimulating factor) given prior to CAM in Patient 1. These findings suggested that chemotherapy combined with simultaneous administration of M-CSF could effectively reduce monocytic leukemia cells by inducing programmed cell death.
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Affiliation(s)
- Y Hasegawa
- Division of Hematology, Institute of Clinical Medicine, University of Tsukuba, Ibaraki, Japan
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16
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Bai A, Kojima H, Hori M, Nara N, Komeno T, Hasegawa Y, Ninomiya H, Abe T, Nagasawa T. Priming with G-CSF effectively enhances low-dose Ara-C-induced in vivo apoptosis in myeloid leukemia cells. Exp Hematol 1999; 27:259-65. [PMID: 10029165 DOI: 10.1016/s0301-472x(98)00041-1] [Citation(s) in RCA: 40] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
We investigated the role of apoptosis in chemotherapy for hematologic malignancies. Twelve consecutive patients with acute myelogenous leukemia (AML) or refractory anemia with excess of blasts in transformation (RAEB-t) who were not tolerable for standard-dose chemotherapy were treated with CAG regimen (low-dose cytosine arabinoside [Ara-C] plus aclarubicin with concurrent administration of granulocyte colony-stimulating factor [G-CSF]). Bone marrow mononuclear cells obtained before the commencement of the chemotherapy were cultured with various concentrations (0-10(-5) M) of Ara-C in the presence or absence of 10 ng/mL of G-CSF, and the resultant cell proliferation/cytotoxicity was assayed. In all but one patient, half killing concentration (LC50) of Ara-C was significantly reduced in the presence of G-CSF (by 400- and 1.45-fold, median: 21-fold). Furthermore, LC(50) values in responders assayed in the presence of 10 ng/mL of G-CSF were significantly lower than those in nonresponders (p = 0.02). In vitro killing tests using a G-CSF-dependent leukemic cell line suggested that addition of G-CSF potentiates Ara-C-induced cytotoxicity through the mechanism of apoptosis. We thus assayed apoptosis in peripheral blood leukemic cells during CAG chemotherapy by flow cytometry using 7-amino-actinomycin D. Peak percentages of apoptosis in responders were significantly higher than those in nonresponders (p = 0.02). These results collectively suggest that apoptosis plays an important role for eradicating leukemic cells by CAG chemo-therapy.
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Affiliation(s)
- A Bai
- Division of Hematology, Institute of Clinical Medicine, University of Tsukuba, Ibaraki, Japan
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17
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Abstract
Qa-1b and its human homolog, HLA-E, predominantly bind leader peptides derived from other class I molecules. Their presentation is TAP-dependent and proteasome-independent. We demonstrate that Dd targeted to the cytosol does not generate the Qa-1b peptide epitope even in the presence of lactacystin. Cells expressing herpes virus ICP-47 block the generation of this epitope, demonstrating that TAP functions in the transport of the peptide from cytosol to ER. This reveals a pathway for antigen presentation of leader peptides that involves translocation of a protein to the ER where its leader is cleaved followed by its release into the cytosol and transport back into the ER. Further, it ensures that Qa-1b expression mirrors the normal expression of class Ia molecules.
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Affiliation(s)
- A Bai
- Department of Microbiology, University of Texas Southwestern Medical Center at Dallas, 75235, USA
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Bouwer HG, Bai A, Forman J, Gregory SH, Wing EJ, Barry RA, Hinrichs DJ. Listeria monocytogenes-infected hepatocytes are targets of major histocompatibility complex class Ib-restricted antilisterial cytotoxic T lymphocytes. Infect Immun 1998; 66:2814-7. [PMID: 9596753 PMCID: PMC108275 DOI: 10.1128/iai.66.6.2814-2817.1998] [Citation(s) in RCA: 23] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/1997] [Accepted: 03/16/1998] [Indexed: 02/07/2023] Open
Abstract
Subclinical infection of BALB/c mice with the intracellular bacterial pathogen Listeria monocytogenes results in the development of protective antilisterial immunity. L. monocytogenes can infect hepatocytes, and antilisterial cytotoxic T lymphocytes (CTL) lyse Listeria-infected hepatocytes in a major histocompatibility complex (MHC) class Ia-restricted manner. It remained to be determined whether L. monocytogenes-infected hepatocytes are susceptible to MHC class Ib-restricted cytolysis. In this study, we showed that hepatocytes express MHC class Ib molecule Qa-1(b) mRNA and protein. We further showed that Listeria-infected hepatocytes are susceptible to MHC class Ib-restricted cytolysis, since C57BL/6-derived Listeria-infected hepatocytes were lysed by BALB/c-derived antilisterial CTL. These results establish that Listeria-infected hepatocytes are susceptible to cytolysis by MHC class Ib restricted Listeria-specific CTL.
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Affiliation(s)
- H G Bouwer
- Immunology Research, VA Medical Center, Portland, Oregon 97201, USA.
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Bai A, Forman J. The effect of the proteasome inhibitor lactacystin on the presentation of transporter associated with antigen processing (TAP)-dependent and TAP-independent peptide epitopes by class I molecules. J Immunol 1997; 159:2139-46. [PMID: 9278300] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
Cells were treated with two proteolytic inhibitors, N-acetyl-leucyl-leucyl-norleucinal and lactacystin, the latter reported to be a specific inhibitor for the proteasome. Both inhibitors retarded the maturation of endo-H-resistant forms of murine and human class I molecules from their endo-H-sensitive precursors in cell lines with functional TAP proteins. HLA-A2 maturation readily occurs in TAP-deficient T2 cells, and it has been shown that the peptides associated with A2 are derived from the leader segment of proteins in the secretory pathway. This maturation is inhibited by N-acetyl-leucyl-leucyl-norleucinal but not lactacystin, indicating that the proteasome is not required for the generation of HLA-A2 binding peptides in these cells. The murine class Ib molecule Qa-1b presents a leader peptide derived from D-end class I molecules to alloreactive CTL. Since this presentation is dependent on the expression of TAP proteins, we determined if this requirement reflects a need for the proteasome to process this peptide. We found that lactacystin did not inhibit the maturation of endo-H-resistant forms of Qa-1b that are dependent on this leader peptide for its maturation, nor did it inhibit the expression of this peptide-Qa-1b complex in a functional assay. Thus, unlike conventional cytosolic peptides, leader peptides (regardless of whether they are dependent on TAP for their presentation) do not require the proteasome for processing.
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Affiliation(s)
- A Bai
- The Graduate Program in Immunology and the Department of Microbiology, University of Texas Southwestern Medical Center, Dallas 75235, USA
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Bai A, Forman J. The effect of the proteasome inhibitor lactacystin on the presentation of transporter associated with antigen processing (TAP)-dependent and TAP-independent peptide epitopes by class I molecules. The Journal of Immunology 1997. [DOI: 10.4049/jimmunol.159.5.2139] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
Abstract
Cells were treated with two proteolytic inhibitors, N-acetyl-leucyl-leucyl-norleucinal and lactacystin, the latter reported to be a specific inhibitor for the proteasome. Both inhibitors retarded the maturation of endo-H-resistant forms of murine and human class I molecules from their endo-H-sensitive precursors in cell lines with functional TAP proteins. HLA-A2 maturation readily occurs in TAP-deficient T2 cells, and it has been shown that the peptides associated with A2 are derived from the leader segment of proteins in the secretory pathway. This maturation is inhibited by N-acetyl-leucyl-leucyl-norleucinal but not lactacystin, indicating that the proteasome is not required for the generation of HLA-A2 binding peptides in these cells. The murine class Ib molecule Qa-1b presents a leader peptide derived from D-end class I molecules to alloreactive CTL. Since this presentation is dependent on the expression of TAP proteins, we determined if this requirement reflects a need for the proteasome to process this peptide. We found that lactacystin did not inhibit the maturation of endo-H-resistant forms of Qa-1b that are dependent on this leader peptide for its maturation, nor did it inhibit the expression of this peptide-Qa-1b complex in a functional assay. Thus, unlike conventional cytosolic peptides, leader peptides (regardless of whether they are dependent on TAP for their presentation) do not require the proteasome for processing.
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Affiliation(s)
- A Bai
- The Graduate Program in Immunology and the Department of Microbiology, University of Texas Southwestern Medical Center, Dallas 75235, USA
| | - J Forman
- The Graduate Program in Immunology and the Department of Microbiology, University of Texas Southwestern Medical Center, Dallas 75235, USA
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Bai A, Eidelman DH, Hogg JC, James AL, Lambert RK, Ludwig MS, Martin J, McDonald DM, Mitzner WA, Okazawa M. Proposed nomenclature for quantifying subdivisions of the bronchial wall. J Appl Physiol (1985) 1994; 77:1011-4. [PMID: 8002485 DOI: 10.1152/jappl.1994.77.2.1011] [Citation(s) in RCA: 108] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023] Open
Abstract
There is increasing interest in the structural components of the airway wall because of the airway remodeling that is observed in conditions such as asthma and chronic obstructive pulmonary disease and because of their contribution to changes in airway mechanics. This interest has stimulated several groups to make morphometric measurements on airway cross sections, and their results have been reported using a variety of nomenclature. We propose the adoption of a standard system of nomenclature that is based on accepted terms for subdivisions of the airway wall and has been agreed to by several groups working in this field.
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Affiliation(s)
- A Bai
- University of British Columbia Pulmonary Research Laboratory, St. Paul's Hospital, Vancouver British Columbia, Canada
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Artesani L, Bianchi A, Balocco A, Grassi E, Bai A, Simone F. [The skeleton in malabsorption: modern techniques in x-ray densitometry]. Radiol Med 1980; 66:629-31. [PMID: 7232795] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
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Bai A. An unusual cause of edema feet in newborn infant. Indian Pediatr 1979; 16:737. [PMID: 546780] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
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