Abstract
Tumor-associated macrophages (TAMs) play a pivotal role in the progression and resistance of tumors to different anticancer drugs. TAMs can modulate the tumor microenvironment (TME) in favor of immune system exhaustion. The interactions of TAMs with TME can affect the function of cytotoxic CD8+ T lymphocytes (CTLs) and natural killer (NK) cells. Furthermore, TAMs can induce cancer cell proliferation by releasing some growth factors, such as transforming growth factor (TGF)-β. TAMs have several positive cross-talks with other immune suppressive cells such as regulatory T cells (Tregs), myeloid-derived suppressor cells (MDSCs), cancerassociated fibroblasts (CAFs), and cancer cells, leading to the release of growth factors, the proliferation of cancer cells and tumor growth. These interactions also can induce invasion and migration of cancer cells, angiogenesis, and metastasis. The inhibition of TAMs is an intriguing strategy for overcoming tumor resistance and suppression of cancer cells. Some natural-derived agents such as melatonin, curcumin, resveratrol, apigenin, and other flavonoids have shown the ability to modulate TME, including TAMs. These adjuvants may be able to boost antitumor immunity through the modulation of TAMs. This review explains the modulatory effects of some well-known naturally derived agents on the activity of TAMs. The modulation of TAMs by these agents may be useful in suppressing tumor growth and invasion.
Graphical Abstract
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