Arnold Z Olali1,2, Anjali Sharma3, Qiuhu Shi4, Donald R Hoover5, Kathleen M Weber6, Audrey L French7, Heather S McKay8, Phyllis C Tien9,10, Lena Al-Harthi2, Michael T Yin11, Ryan D Ross1. 1. Department of Cell and Molecular Medicine; and. 2. Microbial Pathogens and Immunity, Rush University Medical Center, Chicago, IL. 3. Department of Medicine, Albert Einstein College of Medicine, Bronx, NY. 4. Department of Public Health, New York Medical College, Valhalla, NY. 5. Department of Statistics and Institute for Health, Health Care Policy and Aging Research, Rutgers University, Piscataway, NJ. 6. Core Center, Cook County Health/Hektoen Institution of Medicine, Chicago, IL. 7. Department of Medicine, Stroger Hospital of Cook County/CORE Center, Rush University, Chicago, IL. 8. Department of Epidemiology, Johns Hopkins Bloomberg School of Public Health, Baltimore, MD. 9. Department of Medicine, University of California, San Francisco, CA. 10. Medical Service, Department of Veteran Affairs Medical Center, San Francisco, CA; and. 11. Columbia University Medical Center, New York, NY.
Abstract
BACKGROUND: Bone mineral density loss and fat accumulation are common in people living with HIV. The bone-derived hormone, undercarboxylated osteocalcin (ucOCN) regulates fat metabolism. We investigated the relationship between ucOCN change and body fat change among perimenopausal/postmenopausal HIV-seronegative and HIV-seropositive women on long-term antiretrovirals. METHODS: Perimenopausal and postmenopausal women enrolled in the Women's Interagency HIV Study MSK substudy underwent trunk and total fat assessment by dual energy x-ray absorptiometry (DXA) at study enrollment (index visit) and again 2 years later. Circulating ucOCN and cOCN were also measured at the index and 2-year visits. The correlation between the 2-year change in ucOCN and cOCN and change in trunk and total fat was assessed as a function of HIV serostatus using linear regression modeling. Multivariate linear regression assessed the association between ucOCN and cOCN change and total and trunk fat change after adjusting for sociodemographic variables. Linear regression models restricted to HIV-seropositive women were performed to examine the contributions of HIV-specific factors (index CD4 count, viral load, and combined antiretroviral therapy use) on the associations. RESULTS: Increased ucOCN over the 2-year follow-up was associated with less trunk and total fat accumulation in models adjusting for HIV serostatus and participants sociodemographics, whereas there was no association with cOCN and the fat parameters. None of the HIV-specific factors evaluated influenced the association between ucOCN and fat parameters. CONCLUSION: The current study suggests that increases in ucOCN are associated with decreased fat accumulation in HIV-seronegative and HIV-seropositive postmenopausal women on long-term antiretroviral therapy.
BACKGROUND: Bone mineral density loss and fat accumulation are common in people living with HIV. The bone-derived hormone, undercarboxylated osteocalcin (ucOCN) regulates fat metabolism. We investigated the relationship between ucOCN change and body fat change among perimenopausal/postmenopausal HIV-seronegative and HIV-seropositive women on long-term antiretrovirals. METHODS: Perimenopausal and postmenopausal women enrolled in the Women's Interagency HIV Study MSK substudy underwent trunk and total fat assessment by dual energy x-ray absorptiometry (DXA) at study enrollment (index visit) and again 2 years later. Circulating ucOCN and cOCN were also measured at the index and 2-year visits. The correlation between the 2-year change in ucOCN and cOCN and change in trunk and total fat was assessed as a function of HIV serostatus using linear regression modeling. Multivariate linear regression assessed the association between ucOCN and cOCN change and total and trunk fat change after adjusting for sociodemographic variables. Linear regression models restricted to HIV-seropositive women were performed to examine the contributions of HIV-specific factors (index CD4 count, viral load, and combined antiretroviral therapy use) on the associations. RESULTS: Increased ucOCN over the 2-year follow-up was associated with less trunk and total fat accumulation in models adjusting for HIV serostatus and participants sociodemographics, whereas there was no association with cOCN and the fat parameters. None of the HIV-specific factors evaluated influenced the association between ucOCN and fat parameters. CONCLUSION: The current study suggests that increases in ucOCN are associated with decreased fat accumulation in HIV-seronegative and HIV-seropositive postmenopausal women on long-term antiretroviral therapy.
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