Effects of Monoacyltrehalose Fraction of Rhodococcus Biosurfactant on the Innate and Adaptive Immunity Parameters In Vivo.

The biosurfactant monoacyltrehalose fraction isolated from Rhodococcus ruber IEGM 231 actinobacterium suppresses antibody production, bactericidal potential, and production of IL-1β by mouse peritoneal cells after intraperitoneal and intramuscular injection and stimulates the production of IL-10 after intraperitoneal injection. The data of in vitro experiments attest to an important role of bacterial glycolipids in the regulation of the functions of splenocytes and peritoneal macrophages.

Effects of Glycolipid Rhodococcus Biosurfactant on Innate and Adaptive Immunity Parameters In Vivo.

The glycolipid biosurfactant complex from actinobacterium Rhodococcus ruber IEGM 231 inhibits the innate and adaptive immunity parameters after intraperitoneal and intramuscular injection. Marked suppression of antibody production, bactericidal potential, and production of proinflammatory cytokines by peritoneal macrophages, detected in vivo, do not agree with the previously detected immunostimulatory activity of biosurfactants towards the immunocompetent cell cultures; this fact indicates an important role of the cell environment in the formation of immune response under the effect of bacterial glycolipids.

Trehalolipid biosurfactants from nonpathogenic Rhodococcus actinobacteria with diverse immunomodulatory activities.

Actinobacteria of the genus Rhodococcus produce trehalolipid biosurfactants with versatile biochemical properties and low toxicity. In recent years, these biosurfactants are increasingly studied as possible biomedical agents with expressed immunological activities. Applications of trehalolipids from Rhodococcus, predominantly cell-bound, in biomedicine are also attractive because their cost drawback could be less significant for high-value products.

Organic compounds in star forming regions.

The influence of complex dust composition on the general chemical evolution of a prestellar core and the content of complex organic compounds is studied. It is shown that various component groups respond differently to the presence of a small dust population. At early stages the difference is determined primarily by changes in the balance of photo processes due to effective absorption of ultraviolet photons by small dust grains of the second population and collisional reactions with dust particles.

Effect of glycolipid Rhodococcus biosurfactant on secretory activity of neutrophils in vitro.

Glycolipid biosurfactant synthesized by nonpathogenic strain Rhodococcus ruber IEGM231 modulated the production of ROS and IL-8 by peripheral blood neutrophils in spontaneous and stimulated cultures. Secretion of IL-1β и TNF-α by neutrophils in the presence of biosurfactant changed insignificantly.