Different responses of insulin, C-peptide, and testosterone to an oral glucose tolerance test in two groups of women with polycystic ovarian syndrome.
BACKGROUND
To further investigate the relationship between inappropriate gonadotropin, hyperinsulinemia and androgen excess.


METHODS
We divided women with polycystic ovarian syndrome (PCOS) into two groups on the basis of LH/FSH (LH/FSH > or = 3, Group 1, n=30; LH/FSH<3, Group 2, n=25) and measured the responses of insulin, C-peptide (C-P), C-P/insulin (C-I) and testosterone concentrations to an oral glucose tolerance test (OGTT) in these patients and 15 control subjects.


RESULTS
Significant positive correlations were found between basal LH and T (r=O.58, p<0.05) in Group 1, and between fasting serum insulin and T (r=0.48, p<0.05) in Group 2. Although these patients had higher, delayed insulin and C-P responses to OGTT than the control group, much greater insulin and C-P levels and lower C/I values were found in Group 2. T concentrations decreased mildly during OGTT in Group 1 and the control, while they increased slightly in Group 2.


CONCLUSIONS
Our data suggest that hyperinsulinemia in PCOS is due to a enhanced beta-cell secretion and an impaired hepatic clearance of this hormone, hyperandrogenism may be LH-dependent in Group 1 and insulin-dependent in Group 2.
Ke
W X
WX
Department of Gynecology, Nanjing Jingling Hospital, China.
Shan
G Q
GQ
Hua
S Y
SY
D000328:Adult; D000704:Analysis of Variance; D002096:C-Peptide / Q000097:blood*; D005260:Female; D005640:Follicle Stimulating Hormone / Q000097:blood; D005947:Glucose / Q000008:administration & dosage / Q000494:pharmacology*; D005951:Glucose Tolerance Test; D006801:Humans; D017588:Hyperandrogenism / Q000097:blood / Q000503:physiopathology; D007328:Insulin / Q000097:blood*; D007986:Luteinizing Hormone / Q000097:blood; D011085:Polycystic Ovary Syndrome / Q000097:blood*; D013739:Testosterone / Q000097:blood*
D002096:C-Peptide; D007328:Insulin; D013739:Testosterone; D007986:Luteinizing Hormone; D005640:Follicle Stimulating Hormone; D005947:Glucose