title: Purification and biological effects of C-type lectin isolated from Bothrops insularis venom.
abstract: Bothrops insularis is a snake from Queimada Grande Island, which is an island located about 20 miles away from the southeastern coast of Brazil. Compared to other Brazilian species of Bothrops, the toxinology of B. insularis is still poorly understood. Its C-type lectin is involved in several biological processes including anticoagulant and platelet-modulating activities. We purified the C-type lectin (BiLec) from Bothrops insularis venom and investigated its effect in the isolated kidney. BiLec was purified after two chromatographic steps; firstly, the whole venom was submitted to an HPLC molecular exclusion chromatography followed by a second purification through affinity chromatography. B. insularis lectin (BiLec) was studied as to its effect on the renal function of isolated perfused rat kidneys with the use of six Wistar rats. The concentration of 10mug/mL increased perfusion pressure (PP; control(60)=108.27+/-4.9; BiLec(60)=112.9+/-5.4 mmHg; *p<0.05) and renal vascular resistance (RVR; control(60)=5.38+/-0.51; BiLec(60)=6.01+/-0.57 mmHg; *p<0.05). The urinary flow reduced significantly at 90 and 120 min of perfusion (UF; control(120)=0.160+/-0.020; BiLec(120)=0.082+/-0.008 mL g(-1) min(-1); *p<0.05). Glomerular filtration rate (GFR; control(120)=0.697+/-0.084; BiLec(120)=0.394+/-0.063 mL g(-1) min(-1); *p<0.05) diminished only at 120 min. BiLec did not change the percentage of sodium (TNa(+)), potassium (TK(+)) and chloride tubular transport (TCl(-)). The histological alterations probably reflected direct injury on glomerular and tubular renal cells, as demonstrated by the rise in permeability of glomerular endothelial cells, revealed by the presence of a proteinaceous material in the Bowman space. We postulate that the C-type lectin B. insularis promoted its effects probably through interactions with endothelial cells or through the release of other mediators by tubular, mesangial and endothelial cells.
authors.affiliation: Departament of Pathology and Legal Medicine, Federal University of Ceara, Fortaleza, CE, Brazil.
authors.forename: Marcus Davis Machado
authors.initials: MD
authors.lastname: Braga
authors.forename: Alice Maria Costa
authors.initials: AM
authors.lastname: Martins
authors.forename: Daniela Nascimento
authors.initials: DN
authors.lastname: Amora
authors.forename: Dalgimar Beserra
authors.initials: DB
authors.lastname: de Menezes
authors.forename: Marcos Hikari
authors.initials: MH
authors.lastname: Toyama
authors.forename: Daniela Oliveira
authors.initials: DO
authors.lastname: Toyama
authors.forename: Sergio
authors.initials: S
authors.lastname: Marangoni
authors.forename: Paulo Sérgio Ferreira
authors.initials: PS
authors.lastname: Barbosa
authors.forename: Renata
authors.initials: R
authors.lastname: de Sousa Alves
authors.forename: Manassés Claudino
authors.initials: MC
authors.lastname: Fonteles
authors.forename: Helena Serra Azul
authors.initials: HS
authors.lastname: Monteiro
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D017837:Bothrops; D003435:Crotalid Venoms / Q000737:chemistry*; D007668:Kidney / Q000098:blood supply / Q000166:cytology / Q000187:drug effects; D037181:Lectins, C-Type / Q000737:chemistry / Q000302:isolation & purification*; D008297:Male; D008969:Molecular Sequence Data; D051381:Rats; D017208:Rats, Wistar; D014655:Vascular Resistance / Q000187:drug effects
chemical_list: D003435:Crotalid Venoms; D037181:Lectins, C-Type