Immunopharmacologic properties of 1,6-bis[2-(diethylamino)ethoxy]xanthen-9-one dihydrochloride (Wy-15297)

Immunopharmacological properties of azepino [2, 1-b] quinazolin-12(6H)-one-7, 8, 9, 10-tetrahydro (RLX)

The effect of azepino [2,1-b]quinazolin-12(6H)-one-7, 8, 9, 10-tetrahydro (RLX) was studied on cell-mediated and humoral components of the immune system. In single (50, 100 and 200 mg/kg) and multiple (6.25, 12.50, 25 and 50 m/kg) oral dose schedules RLX significantly reduced the early (4 h) and delayed (24 and 48 h) hypersensitivity reactions to SRBC in mice. Daily oral administration of RLX (25, 50 and 100 mg/kg) produced a dose-related reduction in developing adjuvant arthritis in rats. In carrageenan-induced pleurisy in rats RLX (25, 50 and 100 mg/kg p.o.) caused a marked reduction in the volume of pleural exudate (25.26-59.64%) and infiltration of leucocytes (28.75-50.29%) into the pleural cavity. RLX produced marked inhibition of humoral antibody synthesis both in mice and rats and that of complement fixing antibody in mice. It was not cytotoxic and showed no appreciable effect on the responsiveness of splenocytes to mitogens. The observed effect of RLX on cell-mediated and humoral immune responses does not appear to be the result of general toxicity.

Anti-arthritic activity of boswellic acids in bovine serum albumin (BSA)-induced arthritis

The effect of boswellic acids on bovine serum albumin (BSA)-induced arthritis in rabbits was studied. Oral administration of boswellic acids (25, 50 and 100 mg/kg/day) significantly reduced the population of leucocytes in a BSA-injected knee and changed the electrophoretic pattern of the synovial fluid proteins. The local injection of boswellic acids (5, 10 and 20 mg) into the knee 15 min prior to BSA challenge also significantly reduced the infiltration of leucocytes into the knee joint, reduced the infiltration of leucocytes into the pleural cavity and inhibited the migration of PMN in vitro. The leucocyte-inhibitory activity of boswellic acids was not due to its cytotoxic effect. The boswellic acids did not show any detergent or surfactant properties.

Effect of salai guggal ex-Boswellia serrata on cellular and humoral immune responses and leucocyte migration

Effect of alcoholic extract of salai guggal (AESG) was studied on cellular and humoral immune responses in mice and leucocyte migration in rats. Oral administration of AESG strongly inhibited the antibody production and cellular responses to sheep red blood cells in mice. It inhibited the infiltration of polymorphonuclear leucocytes and reduced the volume of pleural exudate in carrageenan induced pleurisy in rats. It showed no cytotoxic effect.

Enhancement of the immune response to sheep erythrocytes in mice by phosphodiesterase-inhibiting dipyridamole derivatives

Some potent phosphodiesterase (PDE)-inhibiting dipyridamole derivatives are able to increase the primary immune response in mice immunized with sheep red blood cells (SRBC). 10mg/kg/day of the most potent substance administered in the drinking water increased the number of plaque forming cells (PFC) in spleens of these mice by a factor of about 2 when the treatment was started after immunization. Pretreating the animals did not result in an enhancement of numbers of plaque forming cells. There was no increase in the background number of PFC.

Immunopharmacological profile of TEI-3096: a new immunomodulator

TEI-3096 [6-p-chlorobenzyl-5H-2,3,6,7-terahydro-5,7-dioxothiazolo (3,2-a) pyrimidine], a novel thiazolopyrimidine compound has been shown to suppress adjuvant arthritis in rats without any effect on conventional inflammation. We examined the immuno-pharmacological profile of TEI-3096 in murine lymphocytes. The blastformation induced by Con A or LPS was inhibited by addition of 50-500 microM concentrations of TEI-3096. This compound suppressed elevated plaque-forming cell (PFC) response against T cell-dependent antigen. However, TEI-3096 had no effect either on normal PFC response or on antibody formation against T cell independent antigen. Although orally administered TEI-3096 had no obvious effect on anti-SRBC PFC response in normal mice, it normalized the colchicine-induced enhancement of antibody formation against TNP-HGG. TEI-3096 also enhanced the delayed type hypersensitivity in mice and rats. These results suggests that TEI-3096 restores the abnormal immune response. Therefore, it may be useful for the treatment of auto-immune disease such as rheumatoid arthritis.