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Fatty Acid Metabolism and Associations with Insulin Sensitivity Differs Between Black and White South African Women
Umeå University, Faculty of Medicine, Department of Public Health and Clinical Medicine, Section of Medicine.ORCID iD: 0000-0002-8057-1684
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2021 (English)In: Journal of Clinical Endocrinology and Metabolism, ISSN 0021-972X, E-ISSN 1945-7197, Vol. 106, no 1, p. E140-E151Article in journal (Refereed) Published
Abstract [en]

Purpose: Genetic differences in desaturase genes and consequently fatty acid metabolism have been reported. The aims were to examine ethnic differences in serum fatty acid composition and desaturase indices, and assess the ethnic-specific associations with insulin sensitivity (IS) and liver fat in black and white South African (SA) women.

Methods: In this cross-sectional study including 92 premenopausal black (n = 46) and white (n = 46) SA women, serum fatty acid composition was measured in cholesteryl ester (CE) and nonesterified fatty acid (NEFA) fractions. Desaturase activities were estimated as product-to-precursor ratios: stearoyl-CoA desaturase-1 (SCD1-16, 16:1n-7/16:0); d-5 desaturase (D5D, 20:4n-6/20:3n-6), and d-6 desaturase (D6D, 18:3n-6/18:2n-6). Whole-body IS was estimated from an oral glucose tolerance test using the Matsuda index. In a subsample (n = 30), liver fat and hepatic IS were measured by 1H-magnetic resonance spectroscopy and hyperinsulinemic euglycemic clamp, respectively.

Results: Despite lower whole-body IS (P = .006), black women had higher CE D5D and lower D6D and SCD1-16 indices than white women (P < .01). CE D6D index was associated with lower IS in white women only (r = -0.31, P = .045), whereas D5D index was associated with higher IS in black women only (r = 0.31, P = .041). In the subsample, D6D and SCD1-16 indices were positively and D5D was negatively associated with liver fat (P < .05). Conversely, CE SCD1-16 was negatively associated with hepatic IS (P < .05), but not independently of liver fat. Conclusions: Ethnic differences in fatty acid-derived desaturation indices were observed, with insulin-resistant black SA women paradoxically showing a fatty acid pattern typical for higher insulin sensitivity in European populations.

Place, publisher, year, edition, pages
Endocrine Society , 2021. Vol. 106, no 1, p. E140-E151
Keywords [en]
desaturase enzymes, stearoyl-CoA desaturase-1, liver fat, ethnicity, cholesteryl ester, non-esterified fatty acid
National Category
Endocrinology and Diabetes
Identifiers
URN: urn:nbn:se:umu:diva-180212DOI: 10.1210/clinem/dgaa696ISI: 000608480200014PubMedID: 32995848Scopus ID: 2-s2.0-85099072596OAI: oai:DiVA.org:umu-180212DiVA, id: diva2:1530671
Available from: 2021-02-23 Created: 2021-02-23 Last updated: 2022-04-27Bibliographically approved

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Chorell, ElinOlsson, Tommy

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