We evaluated, by the flow cytometry technique, the viability of two tumor cell lines: colorectal carcinoma (HT-29) and human A549 arcinoma incubated with the cytotoxic peptide LL-37. The results obtained for the two cell lines HT-29 and A549 are significantly different under the action of cathelicidin LL-37. At high concentrations of 20mM, cellular apoptosis was over 30% higher for colorectal adenocarcinoma line compared to that by peptide exposure. Apoptosis was also significant in low-concentration (4uM) catechidine-labeled lung cancer cells for 48 h. Also, optimization of primers was sought to evaluate gene expression for, Bcl2, IL6, IL8. Determination of gene expression for these molecular targets under the action of the cytotoxic peptide was performed in order to evaluate the immune response of tumor cells. For this purpose, the genetic material (RNA) was extracted from cell cultures and reversed in cDNA, which was subsequently amplified by the qRT-PCR technique. Evaluation of tumor cell metabolism was done by determining the gene expression for Bcl2, IL6, IL8 by the action of the cytotoxic peptides used. The cytotoxic effect of cathelicidin LL-37 for the two cell lines HT29 and A549 is supported by the decrease in IL-6 and IL-8 gene expression. The increase in Bcl2 expression for cells exposed to the action of the peptide is explained by the increase in anti-apoptotic protein synthesis that explains the fight of tumor cells for survival and proliferation.
Design, Synthesis, and Evaluation of a Novel Cytotoxic Peptide-Doxorubicin Conjugate Targeting Triple-Negative Breast Cancer
