Subcellular distribution and glycosylation pattern of androgen receptor from sheep omental adipose tissue

Subcellular distribution and glycosylation pattern of androgen receptor from sheep omental adipose tissue

Sex steroids are known to have an influence on the distribution, metabolism and accretion of adipose tissue. These steroids carry out their function via specific receptors. We have previously reported the presence of oestrogen and progesterone receptors in sheep adipose tissues. In this study, we ha...

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Bibliographic Details
Published in:Journal of endocrinology Vol. 169; no. 3; pp. 587 - 593
Main Authors: McCann, JP, Mayes, JS, Hendricks, GR, Harjo, JB, Watson, GH
Format: Journal Article Conference Proceeding
Language:English
Published: Colchester BioScientifica 01-06-2001
Portland Press
Subjects:
Adipose Tissue - metabolism
Animals
Biological and medical sciences
Blotting, Western
Cell receptors
Cell structures and functions
Cytosol - metabolism
Female
Fundamental and applied biological sciences. Psychology
Glycosylation
Hormone receptors. Growth factor receptors. Cytokine receptors. Prostaglandin receptors
Molecular and cellular biology
Molecular Weight
Omentum - metabolism
Protein Isoforms - metabolism
Receptors, Androgen - chemistry
Receptors, Androgen - metabolism
Sheep - metabolism
Subcellular Fractions - metabolism
Adipose tissue
Androgen
Glycosylation
Vertebrata
Mammalia
Distribution
Sheep
Artiodactyla
Intracellular
Sex steroid hormone
Ungulata
Biological receptor
Hormonal receptor
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Summary:Sex steroids are known to have an influence on the distribution, metabolism and accretion of adipose tissue. These steroids carry out their function via specific receptors. We have previously reported the presence of oestrogen and progesterone receptors in sheep adipose tissues. In this study, we have tested the subcellular distribution of androgen receptor (AR) in sheep omental adipose tissue. Subcellular fractions - microsomes, plasma membrane and nuclei-cell debris - were isolated by differential and sucrose gradient centrifugation and confirmed by electron microscopy. The AR was determined in each fraction by Western blot analyses. As anticipated, the receptor was found in the cytosolic fraction, but a high concentration was also present in the microsomal fraction, a lesser amount in the plasma membrane fraction, and only a small amount was left in the nuclei-cell debris fraction. Two minor immunostaining bands with approximate molecular weights of 250 and 140 kDa and a major band at 110 kDa were detected in the cytosolic fraction, but only the 110 kDa band was detected in the membrane fractions. A 104 kDa band was observed on occasion and believed to be a degradation product. The cytosolic isoforms were tested for sensitivity to glycosidases. This treatment resulted in a decrease in the amount of the 250 and 140 kDa bands. To substantiate that the 250 and 140 kDa isoforms were glycoproteins, the cytosolic fraction was chromatographed on Concanavalin A-Sepharose. The 110 kDa band was eluted in the 0.4 M KCl salt wash while the 250 and 140 kDa bands were eluted with alpha-methylmannoside. Treatment of the glycoprotein (alpha-methylmannoside) peak with glycosidases converted the 250 and 140 kDa bands to the 110 kDa band. These data confirm the presence of AR in subcellular fractions of adipose tissue and suggest that it exists in various glycosylated isoforms.
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ISSN:0022-0795
1479-6805
DOI:10.1677/joe.0.1690587