title: Opposing effects of prostaglandin E(2)and F(2 alpha) on rat liver-associated natural killer cell activity in vitro.
abstract: Strain differences in cancer incidence are proposed to be due partly to differences in immune function. As potential cancer-associated immunological regulators, the concentrations of hepatic prostaglandins E(2)(PGE(2 alpha)and F(2 alpha)(PGF(2 alpha)) were compared in 9-week-old male and female F344/N and Sprague-Dawley (SD) rats. There were no strain or gender differences in the concentrations of hepatic PGE(2). No strain difference was found in the concentration of hepatic PGF(2 alpha), but the hepatic PGF(2 alpha)concentration in female rats was two-fold that of the male rat (130 vs 60 ng/g). PGE(2)significantly inhibited hepatic natural-killer cell (NK) activity in vitro compared with untreated cells from both genders and strains (P<0.05), 25 ng PGE(2)/ml inhibited NK activity significantly more than did 10 ng PGE(2)/ml (P<0.05). In contrast, 50 ng PGF(2 alpha)/ml and 100 ng PGF(2 alpha)/ml significantly stimulated hepatic NK activity compared with untreated hepatic cells from both F344/N and SD rats. This study suggests that prostaglandins may have a negligible net effect on NK activity associated with rat liver, and may be unlikely to mediate cancer-related immune function.
authors.affiliation: Department of Food Science and Human Nutrition, Iowa State University, Ames, Iowa 50010, USA.
authors.forename: H
authors.initials: H
authors.lastname: Liu
authors.forename: J E
authors.initials: JE
authors.lastname: Cunnick
authors.forename: S
authors.initials: S
authors.lastname: Hendrich
mesh_terms: D000704:Analysis of Variance; D000818:Animals; D015237:Dinoprost / Q000031:analogs & derivatives* / Q000494:pharmacology*; D015232:Dinoprostone / Q000494:pharmacology*; D004305:Dose-Response Relationship, Drug; D028441:F2-Isoprostanes; D005260:Female; D007694:Killer Cells, Natural / Q000187:drug effects / Q000378:metabolism*; D007963:Leukocytes, Mononuclear / Q000378:metabolism; D008099:Liver / Q000187:drug effects / Q000378:metabolism*; D008297:Male; D011863:Radioimmunoassay; D051381:Rats; D011916:Rats, Inbred F344; D017207:Rats, Sprague-Dawley; D012737:Sex Factors
chemical_list: D028441:F2-Isoprostanes; C075750:8-epi-prostaglandin F2alpha; D015237:Dinoprost; D015232:Dinoprostone