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Influence of residual insulin secretion and duration of diabetes mellitus on the control of luteinizing hormone secretion in women
Author(s) -
Volpi,
Chiodera,
Gramellini,
Capretti,
Caffarri,
Speroni,
Vescovi,
Coiro
Publication year - 1998
Publication title -
european journal of clinical investigation
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.164
H-Index - 107
eISSN - 1365-2362
pISSN - 0014-2972
DOI - 10.1046/j.1365-2362.1998.00367.x
Subject(s) - endocrinology , medicine , luteinizing hormone , hormone , secretion , gonadotropin releasing hormone , insulin , diabetes mellitus , bolus (digestion) , gonadotropin
Background The aim of the present study was to establish whether the persistence of residual beta‐cell activity after long‐term diabetes mellitus (DM) exerts a protective role on luteinizing hormone (LH) secretion. Methods The LH responses to stimulation with gonadotropin‐releasing hormone (Gn‐RH) (100 μg in an i.v. bolus) or naloxone (4 mg injected in an i.v. bolus, followed by the constant infusion of 8 mg in 2 h) were measured in C‐peptide‐positive (CpP) and C‐peptide‐negative (CpN) normally menstruating women with short‐term (group 1 < 3 years, CpP n = 11, CpN n = 11) or long‐term (group 2 > 10 years, CpP n = 11, CpN n = 11) DM and in age‐matched normal control subjects ( n = 11). Results Gn‐RH induced significant increments in LH secretion in all groups. Significant LH responses to naloxone were observed in all groups, except in group 2 CpN patients. However, the LH response to either Gn‐RH or naloxone was significantly lower in group 1 CpN, group 2 CpP and group 2 CpN patients than in the normal control subjects. Furthermore, the LH response was significantly lower in group 2 CpP than in group 1 CpP patients and in group 2 CpN than in group 1 CpN subjects. Conclusions These results indicate a role for both deficiency in residual endogenous insulin secretion and duration of diabetes in the derangement of LH secretory control. The data suggest that the protective role exerted by residual beta‐cell activity on LH secretion during the early years of DM diminishes with time elapsed after the onset of diabetes mellitus.