title: Polymorphisms in the TNF-α and IL10 gene promoters and risk of arsenic-induced skin lesions and other nondermatological health effects.
abstract: In West Bengal, India, at present, more than 26 million people are exposed to arsenic through drinking water. Among them, only 15-20% manifest arsenic-induced noncancerous, precancerous, and cancerous skin lesions, indicating that genetic variants play important role in arsenic susceptibility. Chronic arsenic exposure has been associated with impairment of immune systems in the exposed individuals. Because cytokines are important immune mediators, alteration in expression of these gene products may lead to arsenic-specific disease manifestations. The aim of the present work was to investigate the association between the TNF-α-308G>A (rs1800629) and IL10 -3575T>A (rs1800890) polymorphisms and arsenic-induced dermatological and nondermatological health outcomes. A case-control study was conducted in West Bengal, India, involving 207 cases with arsenic-induced skin lesions and 190 controls without skin lesions having similar arsenic exposure. The polymorphisms were determined using conventional PCR-sequencing method. ELISA was done to determine the serum levels of the two cytokines tumor necrosis factor α (TNF-α) and interleukin 10 (IL10). Associations between the polymorphisms studied and nondermatological health effects in the study subjects were determined from our epidemiological survey data. Individuals with GA/AA (-308 TNF-α) and TA/AA (-3575 IL10) genotypes were at higher risk of developing arsenic-induced skin lesions, ocular, and respiratory diseases. Also the -308 TNF A allele corresponded to a higher production of TNF-α, and -3575 IL10 A allele corresponded to a lower production of IL10. Thus, the polymorphisms studied impart significant risk toward development of arsenic-induced dermatological and nondermatological health effects in the chronically exposed population of West Bengal, India.
authors.affiliation: Molecular and Human Genetics Division, Indian Institute of Chemical Biology (Unit of Council of Scientific and Industrial Research), West Bengal, Kolkata 700032, India.
authors.forename: Nilanjana
authors.initials: N
authors.lastname: Banerjee
authors.forename: Sujay
authors.initials: S
authors.lastname: Nandy
authors.forename: James K
authors.initials: JK
authors.lastname: Kearns
authors.forename: Apurba K
authors.initials: AK
authors.lastname: Bandyopadhyay
authors.forename: Jayanta K
authors.initials: JK
authors.lastname: Das
authors.forename: Papiya
authors.initials: P
authors.lastname: Majumder
authors.forename: Santanu
authors.initials: S
authors.lastname: Basu
authors.forename: Saptarshi
authors.initials: S
authors.lastname: Banerjee
authors.forename: Tanmoy Jyoti
authors.initials: TJ
authors.lastname: Sau
authors.forename: J Christopher
authors.initials: JC
authors.lastname: States
authors.forename: Ashok K
authors.initials: AK
authors.lastname: Giri
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D001151:Arsenic / Q000633:toxicity*; D001483:Base Sequence; D017931:DNA Primers; D004797:Enzyme-Linked Immunosorbent Assay; D005260:Female; D006801:Humans; D016753:Interleukin-10 / Q000235:genetics*; D008297:Male; D008875:Middle Aged; D016133:Polymerase Chain Reaction; D011110:Polymorphism, Genetic; D011401:Promoter Regions, Genetic; D012871:Skin Diseases / Q000139:chemically induced*; D014409:Tumor Necrosis Factor-alpha / Q000235:genetics*; D055815:Young Adult
chemical_list: D017931:DNA Primers; D014409:Tumor Necrosis Factor-alpha; D016753:Interleukin-10; D001151:Arsenic