Negative Regulation of Toll-like Receptors Signaling Pathways / 生物化学与生物物理进展

Toll-like receptors (TLRs) are key mediators of both innate and adaptive immunity by recognizing and eliciting responses to invading pathogens. The activation of TLRs must be stringently controlled in order to avoid exaggerated expression of signaling components as well as pro-inflammatory cytokines that can devastate the host,resulting in chronic inflammatory diseases,autoimmune disorders and aid in the pathogenesis of TLR-associated diseases. Therefore,it is essential that negative regulators act at multiple levels within TLR signaling cascades in order to synchronize the activation and negative regulation of signal transduction to limit potentially harmful immunological consequences. A summary of the various mechanisms employed by negative regulators of TLRs signaling to ensure the appropriate modulation of both immune and inflammatory responses was provided.

Toll-like Receptors Signaling and Regulation of Immune Response / 生物化学与生物物理进展

Toll-like receptors (TLRs), a large family consisting of at least 10 members, are evolutionarily conserved to recognize pathogen-associated molecular patterns (PAMPs). TLRs activation not only initiates innate immunity, but also regulates enhance antigen-specific acquired immunity, and thus associates innate and adaptive immunity. In recent years, studies on the TLRs signaling, especially their negative regulation, rapidly progressed. TLRs signaling pathway and their roles in regulating immune responses against invading pathogens were reviewed.

A STUDY ON THE CHANGES OF GROWTH CHARACTERISTICS AND SURFACE ULTRASTRUCTURE OF MG3H BEFORE AND AFTER TRANSFECTION WITH PSV2-NEO PLASMID / 解剖学报

The changes of the growth characteristics and surface ultrastructure during longterm passages of Wg3h cells that have been transfected with PSV_2-neo (Wg3h-neo) were studied. The results showed that the growth and DNA synthesis rate were evidently higher in the transfected cells than in the parental wg3h cells. The saturation of the transfected cell growth density was also increased, but neither the parental and transfected cells formed cell colony in soft agar medium nor tumor growth in nude mice. There was no significant differences in morphology between the two cell types under light microscopy, however much more microvilli were seen on the transfected cell surface under scanning electron microscopy. Southern blot hybridization analysis indicated that the PSV_2-neo plasmids were integrated into the genome of the target cells. Our results demonstrated that the transfected cells remained as nonmalignant cells although some changes of their growth characteristics and surface ultrastructure appeared.