Lipogenesis by isolated human apocrine sweat glands: testosterone has no effect during long-term organ maintenance.
Lipid synthesis by freshly isolated human apocrine glands has been measured by the incorporation of [U-14C] acetate. Incorporation is linear over 6 h at 1010 +/- 282 pmol/mg wet weight/h (n = 11; mean +/- sem). The lipid classes, as percentages of the total lipid synthesized, were found by TLC to be cholesterol 12.3 +/- 2.0, mono-glycerides 7.5 +/- 1.5, 1,2 di-glycerides 3.0 +/- 0.9, 1,3 di-glycerides 3.5 +/- 0.5, tri-glycerides 28.4 +/- 1.8, free fatty acids 2.0 +/- 0.4, lysolecithin 15.4 +/- 3.9, sphingomyelin 9.9 +/- 4.3, phosphatidyl-choline 8.4 +/- 0.4, phosphatidyl-ethanolamine -inositol and -serine 1.8 +/- 0.1, phosphatidic acid and cardiolipin 3.3 +/- 0.5, and unidentified 3.3 +/- 0.5 (mean +/- sem, n = 5). Glands were maintained on permeable supports. After 10 d maintenance, electron microscopy showed that the cellular architecture had been preserved, that the ATP contents were the same as in freshly isolated glands, and that [U-14C] acetate incorporation was not significantly altered at 851 +/- 237 pmol/mg/h (n = 18). The addition of 3 microM testosterone had no effect on acetate incorporation at 844 +/- 231 pmol/mg/h (n = 18). The lipid classes and their proportions were similar to the values for fresh glands after 10 d maintenance both with and without testosterone.
Barth
J H
JH
Nuffield Department of Clinical Biochemistry, University of Oxford, U.K.
Ridden
J
J
Philpott
M P
MP
Greenall
M J
MJ
Kealey
T
T
D000085:Acetates / Q000378:metabolism; D000255:Adenosine Triphosphate / Q000378:metabolism; D000368:Aged; D001050:Apocrine Glands / Q000187:drug effects* / Q000378:metabolism / Q000648:ultrastructure; D002855:Chromatography, Thin Layer / Q000379:methods; D005260:Female; D006801:Humans; D008055:Lipids / Q000096:biosynthesis* / Q000145:classification; D008854:Microscopy, Electron; D008875:Middle Aged; D009924:Organ Culture Techniques; D013545:Sweat Glands / Q000187:drug effects*; D013739:Testosterone / Q000494:pharmacology*; D013997:Time Factors
D000085:Acetates; D008055:Lipids; D013739:Testosterone; D000255:Adenosine Triphosphate