Hepatic Steatosis and Ectopic Fat Are Associated With Differences in Subcutaneous Adipose Tissue Gene Expression in People With HIV

Curtis L Gabriel, Fei Ye, Run Fan, Sangeeta Nair, James G Terry, John Jeffrey Carr, Heidi Silver, Paxton Baker, LaToya Hannah, Celestine Wanjalla, Mona Mashayekhi, Sam Bailin, Morgan Lima, Beverly Woodward, Manhal Izzy, Jane F Ferguson, John R Koethe, Curtis L Gabriel, Fei Ye, Run Fan, Sangeeta Nair, James G Terry, John Jeffrey Carr, Heidi Silver, Paxton Baker, LaToya Hannah, Celestine Wanjalla, Mona Mashayekhi, Sam Bailin, Morgan Lima, Beverly Woodward, Manhal Izzy, Jane F Ferguson, John R Koethe

Abstract

Persons with human immunodeficiency virus (PWH) have subcutaneous adipose tissue (SAT) dysfunction related to antiretroviral therapy and direct viral effects, which may contribute to a higher risk of nonalcoholic fatty liver disease compared with human immunodeficiency virus-negative individuals. We assessed relationships between SAT expression of major adipocyte regulatory and lipid storage genes with hepatic and other ectopic lipid deposits in PWH. We enrolled 97 PWH on long-term antiretroviral therapy with suppressed plasma viremia and performed computed tomography measurements of liver attenuation, a measure of hepatic steatosis, skeletal muscle (SM) attenuation, and the volume of abdominal subcutaneous, visceral, and pericardial adipose tissue. Whole SAT gene expression was measured using the Nanostring platform, and relationships with computed tomography imaging and fasting lipids were assessed using multivariable linear regression and network mapping. The cohort had a mean age of 47 years, body mass index of 33.4 kg/m2, and CD4 count of 492 cells/mm3. Lower liver attenuation, a marker of greater steatosis, was associated with differences in SAT gene expression, including lower lipoprotein lipase and acyl-CoA dehydrogenase, and higher phospholipid transfer protein. Lower liver attenuation clustered with lower visceral adipose tissue (VAT) attenuation and greater VAT volume, pericardial fat volume and triglycerides, but no relationship was observed between liver attenuation and SAT volume, SM attenuation, or low-density lipoprotein. Conclusion: Liver attenuation was associated with altered SAT expression of genes regulating lipid metabolism and storage, suggesting that SAT dysfunction may contribute to nonalcoholic fatty liver disease in PWH. SAT gene-expression relationships were similar for VAT volume and attenuation, but not SM, indicating that ectopic lipid deposition may involve multiple pathways.

© 2021 The Authors. Hepatology Communications published by Wiley Periodicals LLC on behalf of the American Association for the Study of Liver Diseases.

Figures

FIG. 1
FIG. 1
Relationships among BMI, fasting lipids, and adipose tissue depot size and density. Spearman correlation coefficients between tissue density (HU), tissue volume, fasting plasma lipids, and BMI in 97 PWH. •P < 0.05, ••P < 0.01. Abbreviation: TG, triglyceride.
FIG. 2
FIG. 2
Correlation of SAT gene expression with fasting lipids, adipose tissue depot size, or tissue density. Heatmap showing relationships between whole adipose tissue gene expression (columns) with fasting lipids and CT characteristics of tissue depots (rows) using adjusted Spearman correlations. Models were adjusted for age, sex, race, BMI, diabetes status, CD4 count at clinic enrollment, duration of ART, exposure to AZT or d4T antiviral therapy, and batch effect (see Supplementary Material).
FIG. 3
FIG. 3
Network analysis of gene–tissue relationships. All relationships between gene expression and tissue depots with raw P value < 0.05 are shown. Larger node size represents a greater degree of connectivity with other nodes. Connecting lines are darker and wider for smaller raw P values between expression of individual genes and plasma lipid levels or tissue characteristics on CT variables and gene expression (see Supplementary Material).

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Source: PubMed

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