title: Effects of Thalassophryne nattereri fish venom in isolated perfused rat kidney.
abstract: Thalassophryne nattereri, popularly known as Niquim, is a venomous fish responsible for many accidents in fishermen in the Northeast of Brazil. The effects of T. nattereri venom on renal physiology has not been tested. Isolated kidneys from Wistar rats of 240-280 g weight were perfused with Krebs-Henseleit solution containing 6g% of previously dialyzed bovine serum albumin. The effects of Niquim venom were studied on the perfusion pressure (PP), renal vascular resistance (RVR), urinary flow (UF), glomerular filtration rate (GFR), percent of sodium tubular transport (%TNa(+)), percent of potassium tubular transport (%TK(+)) and percent of chloride tubular transport (%TCl(-)). The venom of T. nattereri (0.3, 1.0, and 3.0 microg/ml) was always added to the system 30 minutes after the beginning of each experiment (n=6). All experiments were preceded by 30 minutes internal control period and an external control group, where kidneys were perfused with only Krebs-Henseleit solution. All three doses tested promoted increases in PP and RVR. The first two doses also increased GFR and UF. The higher dose promoted decreases in GFR, UF, %TNa(+), %TK(+), %TCl(-). In the treated groups we observed hyalin casts inside all tubules and proteinaceous material in the urinary space. We conclude that the effects resulted from niquim venom agents that promoted a direct effect in kidney cells causing the release of vasoactive factors.
authors.affiliation: Department of Pathology and Forensic Medicine, Rua Monsenhor Furtado, S/N, 60441-750 Fortaleza, CE, Brazil.
authors.forename: P E G
authors.initials: PE
authors.lastname: Facó
authors.forename: A
authors.initials: A
authors.lastname: Havt
authors.forename: P S F
authors.initials: PS
authors.lastname: Barbosa
authors.forename: A C L
authors.initials: AC
authors.lastname: Nobre
authors.forename: G P
authors.initials: GP
authors.lastname: Bezerra
authors.forename: D B
authors.initials: DB
authors.lastname: Menezes
authors.forename: M C
authors.initials: MC
authors.lastname: Fonteles
authors.forename: M
authors.initials: M
authors.lastname: Lopes-Ferreira
authors.forename: H S A
authors.initials: HS
authors.lastname: Monteiro
mesh_terms: D000818:Animals; D024541:Batrachoidiformes; D004305:Dose-Response Relationship, Drug; D005260:Female; D005397:Fish Venoms / Q000494:pharmacology*; D005919:Glomerular Filtration Rate / Q000187:drug effects / Q000502:physiology; D006818:Hyalin / Q000187:drug effects; D007668:Kidney / Q000187:drug effects* / Q000473:pathology; D007684:Kidney Tubules / Q000187:drug effects / Q000473:pathology; D008297:Male; D010477:Perfusion; D051381:Rats; D017208:Rats, Wistar; D014563:Urodynamics / Q000187:drug effects / Q000502:physiology; D014655:Vascular Resistance / Q000187:drug effects / Q000502:physiology
chemical_list: D005397:Fish Venoms