Inhibition of cell growth induced by photosensitizer PP(Arg)2-mediated photodynamic therapy in human breast and prostate cell lines. Part I

SummaryPhotodynamic therapy can become an effective alternative method to surgery. The experiments reveal that using low photosensitizer doses and relatively low energy doses allow us to obtain effective results after PDT (to limit formation of colonies by investigated cancer cells). The prostate and breast cancer cell lines were investigated: MCF-7, a human breast cancer responsive to androgen therapy; MDA-MB231, a more aggressive human breast cancer non-responsive to androgen therapy; LNCaP, a lymphonodal metastasis of prostate carcinoma responsive to androgen therapy; DU-145, a human prostate cancer non-responsive to androgen therapy. Clonogenic assay shows that certain PP(Arg)2 and light energy low doses stimulate the researched colony-forming cancer cells growth. Some low energy doses used during PP(Arg)2-mediated PDT also cause the increase in the colony-forming tumor cells. Among investigated cancer lines, MCF-7 exhibited the biggest sensibility towards PP(Arg)2 and LNCaP the smallest one. PP(Arg)2 based PDT is an effective method in colony growth limitation of breast cancer cell lines: MCF-7, MDA-MB231 and prostate cancer cell lines: LNCaP, DU-145.