| 4 | Prevention and treatment of hypoxia-induced colorectal cancer damage in albino Wister rats显示文摘Background:In the early metastasis of colon cancer,cancer cells detach,migrate,and infiltrate surrounding tissues,including lymph vessels and blood vessels.Tumor heterogeneity arises from both tumor cells and distinct microenvironments.Maldistribution of blood vessels,creates hypoxic regions within the tumors,fostering cancer stem cell-like properties due to reduced oxygen and nutrient supply.Under hypoxia,tumor cells shift to a glycolytic pathway,producing more lactic acid that acidifies the microenvironment and leads to unstable heart rate variability(HRV)factors,weight disparity,and a higher incidence of aberrant crypt foci(ACF).These hypoxic-induced parameters promote cancer cell invasion,increase radiation resistance,and facilitate cancer cell migration.Methods:In this study,we induced hypoxia-preneoplastic colon damage in albino Wister rats by administrating 1,2-dimethyl hydrazine(DMH).After successfully creating a hypoxic environment in albino Wister rats,resulting in preneoplastic colon damage,we randomly allocated Wistar albino rats into seven groups,each containing 8 animals,and conducted a 6-week study.Group 1-Normal control(administered 1 mM EDTA+saline,2 ml/kg/day,p.o.);group 2-Toxic control(administered DMH,30 mg/kg/week,s.c.);group 3-Standard treatment(DMH,30 mg/kg/week,s.c.for 6 weeks),followed by 5-fluorouracil and Leucovorin(25 mg/kg each on 1^(st),3^(rd),7^(th),and 10^(th) days,i.p.after 6 weeks administration of DMH);group 4-Low dose of P1(DMH,30 mg/kg/week,s.c.+P1,2 mg/kg,i.v.,weekly for 3 weeks);group 5-High dose P1(DMH,30 mg/kg/week,s.c.+P1,4 mg/kg,i.v.,weekly for 3 weeks),group 6-Low dose of P2(DMH,30 mg/kg/week,s.c.,+P2,2 mg/kg,i.v.,weekly for 3 weeks),group 7-High dose of P2(DMH,30 mg/kg/week,s.c.,+P2,4 mg/kg,i.v.weekly for 3 weeks).Results:DMH-treated rats exhibited alterations in HRV factors,weight disparity,elevated gastric pH,increased total acidity,a higher incidence of ACF,and changes in antioxidant markers(TBARs,SOD,catalase,GSH).Brightfield microscopy at 40x magnification revealed the presence of large crypts within aberrant crypt foci in the toxic control group.Conclusion:Treatment groups P1 and P2 containing triazine derivatives initiated proteasomal degradation of Hypoxia Inducible Factor-1α(HIF-1α)by activating Prolyl Hydroxylase(PHDs)pathways.HIF-1αunder a hypoxic environment is responsible for activating a multitude of genes involved in angiogenesis,metastasis,invasiveness,pH changes,metabolic reprogramming,stem cell maintenance,resistance to radiation,and downstream regulation of the immune system.Treatment with P1 and P2 groups helped minimize the ACF count and restored HRV factors,weight disparity,pH levels,total acidity,and oxidative balance.Our findings emphasize the potential role of 1,2,4-triazine derivatives in suppressing hypoxia-induced colon carcinogenesis. | Ishrat Jahan Manju Pandey Shalini Pal Bushra Jabi Mohd Yaqub Khan Gaurav Kaithwas | 2024 | Life Research2024，7，1： | 0 |
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