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NF‐κB targeting for overcoming tumor resistance and normal tissues toxicity

K. Mortezaee,M. Najafi,Bagher Farhood,A. Ahmadi,Dheyauldeen Shabeeb,A. Musa

Published 2019 in Journal of Cellular Physiology

ABSTRACT

Radiotherapy and chemotherapy are two famous modalities in tumor‐targeted therapy that lead to systemic and local toxicities for normal tissues. Moreover, several studies have confirmed that exposure of the tumor to radiation or chemotherapy drugs stimulate some signaling pathways in the tumor microenvironment (TME), leading to resistance of cancer cells to apoptosis, as well as promoting angiogenesis and tumor growth. Nuclear factor kappa B (NF‐κB) plays a central role in the regulation of inflammatory responses in both normal tissues and tumors via the release of several cytokines, regulation of prostaglandins, reduction/oxidation (redox) reactions, angiogenesis, and cell death. Upregulation of NF‐κB in normal tissues causes an appearance of inflammatory reactions and oxidative stress, whereas it regulates angiogenesis and suppresses apoptosis, leading to resistance to subsequent doses of radiation or chemotherapy. Selective inhibition of NF‐κB in experimental studies has shown promising results for tumor sensitization via apoptosis induction, inhibition of angiogenesis, and increasing delay of tumor growth. The use of some agents for NF‐κB inhibition has been shown to alleviate radiation/chemotherapy toxicities in normal cells/ tissues. In this current review, we explained the pivotal role of NF‐κB in both normal tissue toxicity and tumor resistance. We also discussed the promising strategies for overcoming these problems with regard to chemotherapy and radiotherapy.

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