TY - JOUR
T1 - Demonstration of a lack of racial difference in secretion of growth hormone despite a racial difference in bone mineral density in premenopausal women - A Clinical Research Center study
AU - Wright, Nancy M.
AU - Papadea, Nick
AU - Willi, Steven
AU - Veldhuis, Johannes D.
AU - Pandey, Janardan P.
AU - Key, L. Lyndon
AU - Bell, Norman H.
PY - 1996
Y1 - 1996
N2 - We previously found GH secretion to be higher in black than white men. Therefore, we performed studies to determine whether this racial difference in GH secretion also occurs in women. Measurements of GH were obtained at 20- min intervals over 24 h and analyzed by deconvolution in 12 healthy black and 12 healthy white premenopausal women. Bone mineral density (BMD) was determined by dual energy x-ray absorptiometry, and GM allotypes were measured as a genetic marker for race. Racial distribution of the groups, as determined by analysis of GM haplotypes, were typical for black and white American populations. Twenty-four-hour integrated GH concentration, GH secretory burst amplitude, burst frequency, half-duration, mass, and half- life were not different in the two groups. Serum testosterone was modestly, but significantly, greater in the black than in the white women (1.1 ± 0.1 vs. 0.9 ± 0.1 nmol/L; P < 0.05). Serum 17β-estradiol and insulin-like growth factor (IGF)-binding protein-3 were not different in the two groups. However, the IGF-I/IGF-binding protein-3 molar ratio was significantly greater in the black than the white women (2.0 ± 0.1 vs. 1.6 ± 0.1; P < 0.02). The BMD of total body (1.12 ± 0.02 vs. 1.07 ± 0.02 g/cm2; P < 0.05) and total hip (0.96 ± 0.04 vs. 0.86 ± 0.04 g/cm2; P < 0.05) were greater in the black (n = 13) than in the white (n = 12) women. There was a trend toward greater BMD of the forearm in the black women (0.58 ± 0.01 vs. 0.56 ± 0.01 g/cm2; P = 0.06) and no racial difference in the BMD of the spine. When examining all subjects together, the BMD of the total body, trochanter, and spine correlated with total integrated GH secretion. Thus, the racial difference in GH secretion that we had previously found in men does not occur in women despite the higher BMD values at several skeletal sites in black women.
AB - We previously found GH secretion to be higher in black than white men. Therefore, we performed studies to determine whether this racial difference in GH secretion also occurs in women. Measurements of GH were obtained at 20- min intervals over 24 h and analyzed by deconvolution in 12 healthy black and 12 healthy white premenopausal women. Bone mineral density (BMD) was determined by dual energy x-ray absorptiometry, and GM allotypes were measured as a genetic marker for race. Racial distribution of the groups, as determined by analysis of GM haplotypes, were typical for black and white American populations. Twenty-four-hour integrated GH concentration, GH secretory burst amplitude, burst frequency, half-duration, mass, and half- life were not different in the two groups. Serum testosterone was modestly, but significantly, greater in the black than in the white women (1.1 ± 0.1 vs. 0.9 ± 0.1 nmol/L; P < 0.05). Serum 17β-estradiol and insulin-like growth factor (IGF)-binding protein-3 were not different in the two groups. However, the IGF-I/IGF-binding protein-3 molar ratio was significantly greater in the black than the white women (2.0 ± 0.1 vs. 1.6 ± 0.1; P < 0.02). The BMD of total body (1.12 ± 0.02 vs. 1.07 ± 0.02 g/cm2; P < 0.05) and total hip (0.96 ± 0.04 vs. 0.86 ± 0.04 g/cm2; P < 0.05) were greater in the black (n = 13) than in the white (n = 12) women. There was a trend toward greater BMD of the forearm in the black women (0.58 ± 0.01 vs. 0.56 ± 0.01 g/cm2; P = 0.06) and no racial difference in the BMD of the spine. When examining all subjects together, the BMD of the total body, trochanter, and spine correlated with total integrated GH secretion. Thus, the racial difference in GH secretion that we had previously found in men does not occur in women despite the higher BMD values at several skeletal sites in black women.
UR - http://www.scopus.com/inward/record.url?scp=0029913481&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0029913481&partnerID=8YFLogxK
U2 - 10.1210/jc.81.3.1023
DO - 10.1210/jc.81.3.1023
M3 - Article
C2 - 8772569
AN - SCOPUS:0029913481
SN - 0021-972X
VL - 81
SP - 1023
EP - 1026
JO - Journal of Clinical Endocrinology and Metabolism
JF - Journal of Clinical Endocrinology and Metabolism
IS - 3
ER -