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Selective and timely induction of apoptosis is an effective means of resolving inflammation. The effects and putative mechanisms by which cyclic AMP (cAMP) modulates leukocyte apoptosis in vivo are still unclear. The present study aims at identifying intracellular pathways underlying the ability of
The local effect of salbutamol and N6,2'-O-dibutyryl adenosine 3':5'-cyclic monophosphate (Bt2 cyclic AMP) on the rat pleural inflammation caused by allergen was investigated. Antigen (ovalbumin, 12 micrograms/cavity) intrathoracically administered to immunized rats led to a marked pleural protein
We have examined whether nitric oxide (NO) induces the expression of c-fos proto-oncogene and the phosphorylation of cyclic AMP response element binding protein (CREB) in the rat retina. NO donor sodium nitroprusside (SNP) was injected into the vitreal cavity of the eye, and the retina and retinal
Prostaglandins E1, prostaglandin E2, 3-oxa-methano-prostaglandin I1 (SM-10906), a stable prostaglandin I2 analog, and dibutyryl cyclic AMP suppressed the production of tumor necrosis factor and interleukin-1 in lipopolysaccharide-stimulated rat pleural resident monocytic cells, whereas they enhanced
Intrapleural injection of PPD into CFA-sensitised guinea-pigs produced a reaction having many of the characteristics of classical delayed hypersensitivity. Quantitative investigations of the time course of this reaction showed that it was typified by an initial delay in the onset of increased
Macrophages are central to inflammation resolution, an active process aimed at restoring tissue homeostasis following an inflammatory response. Here, the effects of db-cAMP on macrophage phenotype and function were investigated. Injection of db-cAMP into the pleural cavity of mice induced monocytes
Thyroid-stimulating hormone, the catecholamine isoproterenol, and prostaglandins E1 and E2, all substances known to increase cAMP concentration in thyroid tissue, accelerate the formation of follicular cavities in explanted thyroid of 15-day-old rat foetuses. Dibutyryl-cAMP added to the medium, but
1. Unstimulated mast cells from the peritoneal cavity of the rat take up (45)Ca: the initial phase of rapid uptake being complete after 1 min incubation of the cells with the isotope. Stimulation of the mast cells with an antigen-antibody reaction, dextran or concanavalin A induces an increase in
When rat mast cells sensitized by IgE antibody were exposed to antigen, transmission electron microscopy revealed alteration of the granules, cavity formation by fusion of the perigranular membrane and granule release by the fusion of the cavity membrane with the mast cell membrane. Scanning
Experiments were performed to study the effects of agents that elevate endogenous cyclic AMP levels on the progression of a reverse passive Arthus reaction in the pleural cavity of rats. Three hours after the onset of the reaction a marked reduction in histamine release was observed which correlated
To examine the hypothesis that soman intoxication leads to degranulation of mast cells with the release of histamine, we studied the effects of soman on rat peritoneal mast cells (RPMC) in vitro and in vivo. In vitro studies were performed with RPMC harvested from Edgewood rats, and challenged with
Using lead citrate as a capture reagent and adenylate-(beta, gamma-methylene) diphosphate (AMP-PCP) as a substrate, we localized adenylate cyclase activity on the non-ruffled border plasma membrane of approximately half of the osteoclasts on trabecular bone surfaces in the tibial metaphyses of
1 The effect of local elevation of leucocyte cyclic adenosine 3',5'-monophosphate (cyclic AMP) content on the continued migration of leucocytes to a site of acute inflammation was studied in the pleural cavity of rats. 2 Leucocyte cyclic AMP levels were elevated by injecting with the irritant into
Peritoneal macrophages obtained during primary or secondary infection with Salmonella enteritidis differ in the proportions of subpopulations with the capacity to secrete prostaglandin E (PGE) and interleukin 1 (IL1) and have bactericidal and tumoricidal activities in vitro. Using indomethacin in