title: Oral exposure to industrial effluent with exceptionally high levels of drugs does not indicate acute toxic effects in rats.
abstract: The Patancheru area near Hyderabad in India is recognized as a key link in the global supply chain for many bulk drugs. A central treatment plant receives wastewater from approximately 90 different manufacturers, and the resulting complex effluent has contaminated surface, ground, and drinking water in the region. Ecotoxicological testing of the effluent has shown adverse effects for several organisms, including aquatic vertebrates, at high dilutions. In addition, a recent study of microbial communities in river sediment indicated that the contamination of antibiotic substances might contribute to the emergence and spread of antibiotic resistance genes. In an attempt to start investigating how exposure to effluent-contaminated water may directly affect humans and other terrestrial vertebrates, rats were tube-fed effluent. Several pharmaceuticals present in the effluent could be detected in rat blood serum at low concentrations. However, results from exploratory microarray and quantitative polymerase chain reaction assays indicated no marked effects on hepatic gene transcription after 5 d of exposure. Clinical analysis of blood serum constituents, used as biomarkers for human disease did not reveal any significant changes, nor was there an effect on weight gain. The authors could not find evidence for any acute toxicity in the rat; however, the authors cannot rule out that [corrected] higher doses of effluent or a longer exposure time may still be associated with risks for terrestrial vertebrates.
authors.affiliation: Institute of Neuroscience and Physiology, The Sahlgrenska Academy at the University of Gothenburg, Gothenburg, Sweden.
authors.forename: Carolin
authors.initials: C
authors.lastname: Rutgersson
authors.forename: Lina
authors.initials: L
authors.lastname: Gunnarsson
authors.forename: Jerker
authors.initials: J
authors.lastname: Fick
authors.forename: Erik
authors.initials: E
authors.lastname: Kristiansson
authors.forename: D G Joakim
authors.initials: DG
authors.lastname: Larsson
mesh_terms: D000818:Animals; D001681:Biological Assay; D004352:Drug Resistance, Microbial; D007194:India; D008297:Male; D004364:Pharmaceutical Preparations / Q000032:analysis*; D051381:Rats; D017207:Rats, Sprague-Dawley; D045483:Rivers / Q000737:chemistry*; D023382:Toxicity Tests, Acute; D014874:Water Pollutants, Chemical / Q000032:analysis / Q000633:toxicity*
chemical_list: D004364:Pharmaceutical Preparations; D014874:Water Pollutants, Chemical