title: Green tea (Camellia sinensis) alleviates arsenic-induced damages to DNA and intestinal tissues in rat and in situ intestinal loop by reinforcing antioxidant system.
abstract: This study elucidates the protective role of Green tea (Camellia sinensis or CS) against arsenic-induced mutagenic DNA-breakage/intestinal (small) damages in female rats. Intestinal epithelial cells receive ingested arsenic initially. Though, the possibility of damages in this tissue is immense and the therapeutic strategies against this damage are of great concern, reports on either issue are scanty. Our earlier study on arsenic-exposed human unveils a link between carcinogenesis and mutagenic DNA damage. Here, we demonstrate that supplementation of CS-extract (10 mg/mL water) with NaAsO2 (0.6 ppm)/100 g b.w. for 28 days to rats offered a significant protection against arsenic-induced oxidative damages to DNA and intestinal (small) tissues by buttressing antioxidant systems. Necrotic and apoptotic damages and their CS-protection are shown in DNA-fragmentation, comet-assay, and histoarchitecture (hematoxylin and eosin and periodic acid-schiff staining) results. Only arsenic exposure significantly decreased intestinal superoxide dismutase, catalase activities, and level of soluble thiol with a concomitant increase in malondialdehyde/conjugated dienes. Alteration of serum necrotic marker lactate dehydrogenase and the metabolic inflammatory marker c-reactive protein also indicate the impairment may be occurring at transcription and/or cellular signal transduction level. In addition, in situ incubation in rat intestinal loop filled for 24 h with NaAsO2 alone (250 µM) or with aqueous CS-extract (250 mg/mL) suggests that small intestinal epithelial cells are significantly protected by CS against arsenic-associated necrotic/mutagenic damages, which is observed in DNA-breakage studies. In conclusion, besides intensifying endogenous antioxidant system, CS polyphenols also offer a direct role on free radical scavenging activity that is associated to the protection from mutagenic DNA-breakages and prevention of tissue necrosis/carcinogenesis generated by arsenic.
authors.affiliation: Department of Biochemistry and Biotechnology, Cell and Molecular Therapeutics Laboratory, Oriental Institute of Science and Technology, Vidyasagar University, Midnapore, 721102, West Bengal, India.
authors.forename: Nirmallya
authors.initials: N
authors.lastname: Acharyya
authors.affiliation: Department of Biochemistry and Biotechnology, Cell and Molecular Therapeutics Laboratory, Oriental Institute of Science and Technology, Vidyasagar University, Midnapore, 721102, West Bengal, India.
authors.forename: Sk
authors.initials: S
authors.lastname: Sajed Ali
authors.affiliation: Department of Bio-Medical Laboratory Science and Management (UGC Innovative Department), Vidyasagar University, Midnapore, 721102, West Bengal, India.
authors.forename: Bimal
authors.initials: B
authors.lastname: Deb
authors.affiliation: Department of Bio-Medical Laboratory Science and Management (UGC Innovative Department), Vidyasagar University, Midnapore, 721102, West Bengal, India.
authors.forename: Sandip
authors.initials: S
authors.lastname: Chattopadhyay
authors.affiliation: Department of Biochemistry and Biotechnology, Cell and Molecular Therapeutics Laboratory, Oriental Institute of Science and Technology, Vidyasagar University, Midnapore, 721102, West Bengal, India.|Epidemiology and Human Health, Agricure Biotech Research Society, Mahatabpur, Midnapore, 721101, West Bengal, India.
authors.forename: Smarajit
authors.initials: S
authors.lastname: Maiti
mesh_terms: D000818:Animals; D000975:Antioxidants / Q000378:metabolism*; D018053:Arsenites / Q000633:toxicity*; D002097:C-Reactive Protein / Q000032:analysis; D028241:Camellia sinensis / Q000737:chemistry* / Q000378:metabolism; D002374:Catalase / Q000378:metabolism; D020552:Comet Assay; D004247:DNA / Q000737:chemistry / Q000378:metabolism; D053938:DNA Fragmentation / Q000187:drug effects*; D005260:Female; D016166:Free Radical Scavengers / Q000737:chemistry / Q000494:pharmacology; D007421:Intestine, Small / Q000187:drug effects* / Q000378:metabolism / Q000473:pathology; D007770:L-Lactate Dehydrogenase / Q000097:blood; D008099:Liver / Q000187:drug effects / Q000378:metabolism / Q000473:pathology; D018384:Oxidative Stress / Q000187:drug effects; D010936:Plant Extracts / Q000494:pharmacology; D059808:Polyphenols / Q000737:chemistry / Q000494:pharmacology; D051381:Rats; D017670:Sodium Compounds / Q000633:toxicity*; D013482:Superoxide Dismutase / Q000378:metabolism
chemical_list: D000975:Antioxidants; D018053:Arsenites; D016166:Free Radical Scavengers; D010936:Plant Extracts; D059808:Polyphenols; D017670:Sodium Compounds; C017947:sodium arsenite; D002097:C-Reactive Protein; D004247:DNA; D007770:L-Lactate Dehydrogenase; D002374:Catalase; D013482:Superoxide Dismutase
keywords: Camellia sinensis; DNA breakage; antioxidant systems; arsenic; intestinal carcinogenesis; therapeutics