Effect of selected pesticides and their ozonation by-products on gap junctional intercellular communication using rat liver epithelial cell lines.
The non-genotoxic effects of two commonly used pesticides, 1,1-bis (p-chlorophenyl)-2,2,2-trichloroethane (DDT) and malathion, and one widely used commercial insect repellent N,N-diethy-m-toluamide (DEET) on gap junction intercellular communication (GJIC) were determined using a rat liver epithelial cell line. Malathion and DDT reversibly inhibited GJIC in a treatment time- and dose-dependent manner at non-cytotoxic doses, whereas, DEET did not inhibit GJIC. Malathion was very reactive with ozone, while DEET and DDT did not react to any appreciable extent with ozone. The mixtures of ozonation products from malathion and DEET did not inhibit GJIC. The mixtures of ozonation by-products formed from DDT inhibited GJIC, but to a lesser extent than did DDT, itself. These results suggest that ozone can effectively remove malathion from solution without forming GJIC-toxic products, but is less effective in eliminating DEET and DDT from solution.
Masten
S J
SJ
Department of Civil and Environmental Engineering, Michigan State University, East Lansing 48824, USA. masten@egr.msu.edu
Tian
M
M
Upham
B L
BL
Trosko
J E
JE
D000818:Animals; D002450:Cell Communication / Q000187:drug effects*; D002460:Cell Line; D003634:DDT / Q000633:toxicity*; D003671:DEET / Q000633:toxicity*; D004847:Epithelial Cells; D017629:Gap Junctions / Q000187:drug effects / Q000502:physiology*; D007302:Insect Repellents / Q000633:toxicity*; D007306:Insecticides / Q000633:toxicity*; D008099:Liver / Q000187:drug effects / Q000502:physiology; D008294:Malathion / Q000633:toxicity*; D010083:Oxidants, Photochemical / Q000737:chemistry; D010084:Oxidation-Reduction; D010126:Ozone / Q000737:chemistry; D051381:Rats; D011916:Rats, Inbred F344
D007302:Insect Repellents; D007306:Insecticides; D010083:Oxidants, Photochemical; D003671:DEET; D010126:Ozone; D003634:DDT; D008294:Malathion