Toll-Like Receptors (TLRs): The Role in Tumor Progression
نویسندگان
چکیده
Toll-like receptors (TLRs) are major components of the innate immune system that recognize the conserved molecular structures of pathogens (pathogen-associated molecular patterns; PAMPs). TLRs are found in many different cell types, ranging from epithelial to immunocompetent cells. TLR binding triggers the expression of several adapter proteins and downstream kinases, leading to the induction of key pro-inflammatory mediators. This results in the activation of both the innate immune response (elevated expression of antiapoptotic proteins, proinflammatory cytokines, and antibacterial proteins), as well as the adaptive immune response (maturation of the dendritic cells, antigen presentation, etc.). In consequence of their ability to enhance the specific and nonspecific immune reactions of an organism, TLR agonists are widely used in the therapy of infectious diseases and, as adjuvants, in the therapy of malignant neoplasia. However, to date, TLRs have had the opposite effects on tumor progression. On the one hand, TLR ligands can suppress tumor growth. On the other hand, TLR agonists can promote the survival of malignant cells and increase their resistance to chemotherapy. The purpose of this review is to summarize the available data on the effects of TLRs and their agonists on tumor progression, as well as the mechanisms underlying the differences in the effects of TLRs on tumor growth.
منابع مشابه
The Role of Toll-Like Receptors in Breast Cancer
Breast cancer is highly prevalent worldwide. Treatment of this disease is a major global public health problem; therefore, numerous studies have explored new molecular profile helping for breast cancer therapy. Different risk factors are attributed to breast cancer; however, chronic inflammation and immune regulation are highly essential. Various molecules impact this context, including toll-li...
متن کاملEvaluation of Soluble Toll-Like Receptors 2, 4, 9 and Their Damps Signaling Molecules (HMGB1 & HSP70) in Breast Cancer Patients of Basrah Province
Introduction: Toll-Like Receptors (TLRs) are members of pattern recognition receptors that recognize various molecules, including pathogen-associated molecular patterns and dead-associated molecular patterns. These receptors are expressed by immune, non-immune, and tumor cells. Some TLRs are implicated in tumor progression, while others are involved in tumor suppression. Our study aimed to eval...
متن کاملO-34: Cell Membrane Toll like Receptors Expression in Follicular Cells of Women with Endometriosis
Background: Endometriosis is the growth of endometrial cells outside the uterine cavity. It has been suggested that immune system plays important roles in both initiation and progression of the disease. Several studies have been shown that women with endometriosis diverge in their expression of different genes including heat-shock proteins, fibronectin, and neutrophil elastase, which might be i...
متن کاملP-184: The Role of Cell Surface Toll Like Receptors in Endometriosis
Background: Toll like receptors (TLRs) are a major family of innate immune systems which recognize specific pathogen associated molecular patterns (PAMPS)in bacterial, fungi, virus and parasites. Human TLRs comprise a large family of 10 different type proteins that are expressed on various immune cells. Among these receptors, TLR1, 2, 4, 5, 6 and 10 were expressed on the cell surface. TLR2 form...
متن کاملThe Efficacy of Toll-Like Receptors in Awakening Dendritic Cell/Natural Killer Cell System for Eradication of Tumors
Natural killer (NK) cells are effector cells of the innate immune system that exert direct cytotoxic functions. Ubiquitously-expressed toll-like receptors (TLRs) have been recognized as one of the major components promoting dendritic cell (DC) maturation, which may induce polarized immune responses beneficial to cancer immunotherapy. TLR-activated NK cells and DCs are prerequisite for robust ac...
متن کامل