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Objective: to evaluate the viability of cells against exposure to the methanol extract of Gladiolus segetum ( MEGS ) by various colorimetric detection tests (Alamar Blue, WST-1) and the trypan blue exclusion test in Human Leukemia Monocytes THP-1 and Using reverse transcription-polymerase chain reaction assays. Methods: human THP-1 monocytic cell line was exposed to 25 to 800 μg/mL concentrations of MEGS for 24 h and cellular viability was estimated using Alamar Blue, WST-1 and trypan blue tests. Gene expressions were performed using reverse transcription-polymerase chain reaction assays and the measurement of Caspase-3 enzyme activity. Results: a decrease of viability was observed with a dose-dependent effect of MEGS on THP-1. In addition, a differential expression involved in the different genes tested. Moreover, it has been shown overexpression of casp3 for an exposure to 25 μg/ml and 100 μg/ml of MEGS. Conclusion: Our results show that the MEGS present a toxicity to THP-1 cells, especially with regard to apoptosis processes. Key words: Gene expressions, Viability, Gladiolus segetum,THP-1, Toxicity.

Anti-cancer Activity and Gene Expression Responses to Methanol Extract of Gladiolus segetum in THP-1 Human Monocytic Leukemia Cells