Trauma-haemorrhage-induced alterations in thymic prolactin receptor expression: implications in immune dysfunction.
Male gender and age appear to be causative factors in development of immunodepression and septic complications following trauma-haemorrhage. Studies have demonstrated that administration of the sex hormone prolactin following trauma-haemorrhage in male mice prevents immunodepression. Since the thymus is the primary location of the T-cell-lymphopoiesis, we investigated the effect of trauma-haemorrhage to thymic prolactin-receptor (PRLr)-expression in male and proestrus female mice in three different age groups (young, adult, aged) by flow cytometry and PCR. C3H/HeN mice were subjected to laparotomy (i.e., soft-tissue trauma) and hemorrhagic shock (35+/-5mmHg for 90min, then resuscitated) or sham operation. Twenty-four hours later thymocytes were isolated. Trauma-haemorrhage upregulated PRLr expression in young and mature mice of both genders, however, the increase was attenuated in females. In contrast, in aged mice PRLr expression was elevated in both genders, independent of trauma-haemorrhage and was not further increased under such conditions. These findings suggest that the gender dimorphism in the immune response to trauma-haemorrhage may in part be related to differences in thymic PRLr expression under such conditions.
Center for Surgical Research and Department of Surgery, University of Alabama at Birmingham, Birmingham, AL 35294-0019, USA.
Eike A
EA
Nickel
Martin G
MG
Schwacha
Christian P
CP
Schneider
Kirby I
KI
Bland
Irshad H
IH
Chaudry
D000375:Aging / Q000276:immunology / Q000378:metabolism; D000818:Animals; D001483:Base Sequence; D018076:DNA, Complementary / Q000235:genetics; D005260:Female; D007108:Immune Tolerance; D008297:Male; D051379:Mice; D008809:Mice, Inbred C3H; D012333:RNA, Messenger / Q000235:genetics / Q000378:metabolism; D011981:Receptors, Prolactin / Q000235:genetics / Q000276:immunology* / Q000378:metabolism*; D012727:Sex Characteristics; D012771:Shock, Hemorrhagic / Q000235:genetics / Q000276:immunology* / Q000378:metabolism*; D013601:T-Lymphocytes / Q000276:immunology / Q000378:metabolism; D013950:Thymus Gland / Q000276:immunology* / Q000378:metabolism*; D014947:Wounds and Injuries / Q000235:genetics / Q000276:immunology* / Q000378:metabolism*
D018076:DNA, Complementary; D012333:RNA, Messenger; D011981:Receptors, Prolactin