Abstract:
:The nonobese diabetic (NOD) mouse develops diabetes spontaneously due to autoimmune destruction of the pancreatic islets with a higher incidence in the female than the male. Prolactin (PRL), a hormone whose role has been previously focused on reproduction and lactation has been demonstrated to influence immune responses. In this study, we investigated the effect of hypoprolactinemia and hyperprolactinemia on the incidence of diabetes in male and female NOD mice. Our hypoprolactinemia model was induced from the time of weaning (21 days of age) to 112 days of age by daily injections of 200 micrograms of bromocriptine (CB-154). A hyperprolactinemic model was induced by a syngeneic anterior pituitary transplant (APT) to the kidney capsule at 35 days of age and maintained until 112 days of age. Additional experimental groups were also investigated. A group of males received pituitary transplants combined with daily subcutaneous injections of CB-154. A group of females treated with CB-154 was also given daily subcutaneous injections of 30 micrograms of oPRL. An ovariectomized (OVX-Control) group of females was also established to serve as a second control for the OVX-APT group. Bromocriptine administration did not significantly decrease plasma PRL levels compared to controls (CTRL) while APT animals had plasma PRL levels that were significantly higher (P < 0.01) than those of CTRL and CB-154 animals. These differences were observed in animals of both sexes. Bromocriptine treatment of APT groups significantly lowered plasma PRL levels from their respective controls. Plasma PRL from the OVX-Control group was markedly lower than the intact female control. The incidence of diabetes was significantly lower in female mice receiving CB-154 injections compared to the intact female CTRL group at 84, 98 and 112 days of age.(ABSTRACT TRUNCATED AT 250 WORDS)
journal_name
Autoimmunityjournal_title
Autoimmunityauthors
Hawkins TA,Gala RR,Dunbar JCdoi
10.3109/08916939409007991subject
Has Abstractpub_date
1994-01-01 00:00:00pages
155-62issue
3eissn
0891-6934issn
1607-842Xjournal_volume
18pub_type
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