title: Prostaglandin E2 depresses antigen-presenting cell function of peritoneal macrophages.
abstract: Eicosanoids play a prominent role in trauma. Such mediators of inflammation negatively influence cell-mediated immunity (CMI). There is, however, no information available on the effect of eicosanoids on a critical event in CMI, i.e., antigen-presenting (AP) cell function of macrophages (M luminal diameter), a cellular process responsible for the activation of T and B lymphocytes. The aim of this study, therefore, was to examine the effect of prostaglandin E2 (PGE2) and thromboxane B2 (TXB2) on AP cell function of the peritoneal M luminal diameter. To study this, a T-helper-cell clone, D10.G4.1 was employed. This cell clone proliferates in the presence of Iak (Class II glycoprotein, MAC product) bearing M luminal diameter and specific antigen (conalbumin A) thus directly reflecting the AP capability of the M luminal diameter. Peritoneal M luminal diameter were harvested from B10.BR mice (H2k) and their AP was tested in vitro by incubating varying numbers of M luminal diameter with 2 X 10(4) D10.G4.1 cells/well and conalbumin (400 micrograms/ml) in the presence and absence of different concentrations of PGE2 or TXB2. Cultures were incubated for 72 hr, pulsed with [3H]-thymidine, and harvested. At concentrations of 10, 30, and 100 nM of PGE2, D10.G4.1 proliferations were 38, 35, and 20% of control, respectively (P less than 0.05 compared to control). TXB2 added at the above-mentioned concentrations did not suppress the proliferative response of D10. Thus, PGE2 but not TXB2 has a potent immunosuppressive effect on AP of peritoneal M luminal diameter.(ABSTRACT TRUNCATED AT 250 WORDS)
authors.affiliation: Department of Surgery and Physiology, Michigan State University, East Lansing 48824.
authors.forename: R N
authors.initials: RN
authors.lastname: Stephan
authors.forename: P J
authors.initials: PJ
authors.lastname: Conrad
authors.forename: M
authors.initials: M
authors.lastname: Saizawa
authors.forename: R E
authors.initials: RE
authors.lastname: Dean
authors.forename: I H
authors.initials: IH
authors.lastname: Chaudry
mesh_terms: D000818:Animals; D000938:Antigen-Presenting Cells / Q000502:physiology*; D015232:Dinoprostone; D007111:Immunity, Cellular / Q000187:drug effects; D008264:Macrophages / Q000276:immunology*; D010537:Peritoneum / Q000166:cytology*; D011458:Prostaglandins E / Q000494:pharmacology*; D013929:Thromboxane B2 / Q000494:pharmacology
chemical_list: D011458:Prostaglandins E; D013929:Thromboxane B2; D015232:Dinoprostone