Abstract
Aminolevulinic acid–based photodynamic therapy (ALA-PDT) has emerged as a new alternative for chemotherapy in cancer treatment due to its high specificity and low side effects. We added siRNAs and inhibitors of transporters to study the roles of transporters in ALA uptake in sets of normal and cancer cell lines. PEPT1 and PAT1 were expressed only in normal lung and prostate cells, respectively, but not in their cancerous counterparts. Inhibition of these transporters showed a significant decrease in PpIX production only in normal cells. PEPT1 and PAT1 transporter inhibitors could be possible new drugs to increase the specificity of ALA-PDT.
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