Abstract:
:It has been suggested that obesity and loss of ovarian function alter the inflammatory response to immune stress. Ovariectomized (OVX) rats, which are used as a model of human menopause, exhibit both hyperphagia-induced obesity and gonadal steroid deficiency. To evaluate the effects of ovariectomy on inflammatory responses, we compared the anorectic response to LPS in OVX rats and gonad intact female rats. As leptin and hypothalamic interleukin-1β (IL1β) play pivotal roles in the anorectic response to immune stress, these factors were also measured. It was found that the OVX rats exhibited an increased anorectic response to LPS compared with the sham-operated rats. The OVX rats showed higher serum leptin concentrations and a greater increase in hypothalamic IL1β mRNA expression after LPS injection. In addition, in order to determine whether gonadal steroid deficiency contributes to the changes in the inflammatory responses of OVX rats, we compared responses between OVX rats treated with gonadal steroids and untreated OVX rats. There were no differences in appetite, the serum leptin level, and hypothalamic IL1β mRNA expression between the two groups after LPS injection. These findings suggest that the loss of ovarian function increases the induction of leptin and hypothalamic IL1β synthesis and consequently increases the anorectic response under immune stress conditions. It is possible that these alterations are caused by OVX-induced obesity rather than the direct effects of gonadal steroid deficiency.
journal_name
J Reprod Immunoljournal_title
Journal of reproductive immunologyauthors
Iwasa T,Matsuzaki T,Kinouchi R,Gereltsetseg G,Murakami M,Nakazawa H,Fujisawa S,Yamamoto S,Kuwahara A,Yasui T,Irahara Mdoi
10.1016/j.jri.2011.05.010subject
Has Abstractpub_date
2011-09-01 00:00:00pages
41-7issue
1-2eissn
0165-0378issn
1872-7603pii
S0165-0378(11)00274-9journal_volume
91pub_type
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