Abstract
Cancer is one of the leading causes of death around the world with major side effects for existing therapies. The current study was aimed to extract pigments from microbial isolates and evaluate their efficacy and anticancer mechanisms. Pigment from a selected microbial isolate was extracted using methanol and its cytotoxicity was assessed on cancer cells by 3-(4,5-dimethylthiazol-2yl)-2,5-diphenyltetrazolium bromide assay. Promising isolate was identified by molecular methods and purified by TLC. The apoptotic potential of the purified pigment was analysed by trypan blue, caspase and nitrite assays, LDH cytotoxicity, flow cytometry of cell cycle and gene expression studies (RT-qPCR) on cancer cell lines and healthy lymphocytes. The yellow pigment, B3, extracted from the isolate Streptomyces sp. JUA14 has exhibited promising anticancer activity as shown by increased caspase and LDH activities, nitrite levels, G1 phase arrest in cell cycle, and enhanced p53, PTEN, Bax and down-regulated Bcl-2 expressions in the cancer cells which indicated the apoptotic potential of the pigment. The normal lymphocyte cells remained unaffected and the in vivo acute toxicity studies were supportive of the non-toxic nature of the compound in Balb/c mice. Using GC-MS method, pigment characterization revealed the presence of marmycin A and streptazon C which were antitumor compounds reported earlier. The pigment B3 from Streptomyces sp. JUA14 has potent anticancer effects being non-toxic to the healthy cells and hence shows promise towards future characterization and in vivo efficacy studies.
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ACKNOWLEDGMENTS
The authors thank Jain University, Bangalore, India for providing the infrastructural support. The authors would like to thank Dr. S. Kumar, IAH&VB, Bangalore and Dr. S. Rani, IAH&VB, Bangalore for providing the qRT-PCR facility. The authors would also like to thank Geniron Biolabs, Anekal, Bangalore for permitting to carry out the in vivo mice model experiments.
Funding
This work was supported by Department of Science and Technology- Science and Engineering Board (DST-SERB), Government of India.
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Gajaraj, B., Nadumane, V.K. Altered Expressions of PTEN, p53, Bax and Bcl-2 Genes by a Bioactive Pigment from Streptomyces sp. JUA14 Mediate Apoptosis of Cancer Cells. Appl Biochem Microbiol 59, 145–159 (2023). https://doi.org/10.1134/S0003683823020059
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DOI: https://doi.org/10.1134/S0003683823020059