RESUMO
Background: Tarantula cubensis venom (Theranekron®) is used as a homeopathic medicine which has shown anti-tumor effects in veterinary medicine. The aim of this study was to assess effect of Tarantula cubensis venom on apoptotic cell death of human cancer cell lines. Methods: HEK293, MCF7 and HN5 cell lines were used. The cells were treated with different concentrations of alcoholic extract of Tarantula cubensis (Theranekron®) for different periods of time. Cell morphology was studied by light microscopic observation. Cell proliferation was evaluated by MTT assay and death rate was assessed applying trypan blue staining. Apoptosis was assessed by DNA fragmentation, cleaved caspase-3 protein western blotting and ELISA caspase-3 activity assays. Results: Tarantula cubensis venom ruined cell adhesion, reduced cell proliferation, increased cell death rates and caused DNA fragmentation in human cells. An increased caspase-3 cleavage and hyper-activation of caspase-3 was detected in the cells treated with the venom. Results also showed a significantly higher toxicity and apoptosis levels in cancer cell lines MCF7 and HN5 compared with non-cancerous HEK293 cells. Conclusion: We conclude that Tarantula cubensis venom is selectively toxic for human cancer cells via inducing caspase-3- mediated apoptosis.
RESUMO
In the present study, 13 clinical cases of canine mammary adenocarcinoma were evaluated in order to understand the effect of Tarantula cubensis extract (TCE) on tumor tissue. Punch biopsies were taken from the tumors before treatment with TCE. Subcutaneous injections of TCE were administered three times at weekly intervals (3 mL per dog). Between days 7 and 10 after the third injection, the tumor masses were extirpated by complete unilateral mastectomy. Pre- and post-treatment tumor tissues were immunohistochemically assessed. The expression of B-cell lymphoma 2 (Bcl-2) was found to be higher in pre-treatment compared to post-treatment tissues (p 0.05). The apoptotic index was determined to be low before treatment and increased during treatment. These results suggest that TCE may be effective for controlling the local growth of canine mammary adenocarcinoma by regulating apoptosis.