Thalidomide has proven to exert anti-inflammatory, anti-proliferative and anti-angiogenic activities in both neoplastic and non-neoplastic conditions. We investigated the effects of this compound on blood vessel formation, inflammatory cell recruitment/activation and cytokine production of 4T1 mammary tumor in mice.
Materials and methods
4T1 cells were injected subcutaneously into Balb/c mice. After tumor engraftment (5 days), thalidomide (150 mg/kg) was administered to the treated group for 7 days. Tumors of control and treated groups were sized regularly, removed 12 days after inoculation and processed for biochemical parameters to assess neovascularization and inflammation.
Daily oral dose of thalidomide was able to reduce in 46% the tumor volume. Assessment of tumor vascularization revealed a significant decrease in blood vessels formation by thalidomide. The levels of two cytokines, VEGF and TNF-α were decreased in tumor samples of thalidomide-treated group compared with the control group. Accumulation of neutrophils or macrophages in the 4T1 tumor measured by the activities of inflammatory enzymes, MPO for neutrophils and NAG for macrophages, was inhibited by the treatment.
By targeting key components of 4T1 tumor simultaneously, thalidomide was effective in attenuating tumor growth. This approach, suppression of inflammation and angiogenesis may provide further insights for both prevention and treatment of cancer.
FAPEMIG, CNPq and CAPES.