T. nattereri fish venom was obtained from fresh captured specimens at the Northeastern coast of Brazil (IBAMA 16221-1); natterins and nattectin were isolated as described before ( Lopes-Ferreira et al., 2004). Endotoxin Detoxi-Gel TM (Pierce, Perbio, Northumberland, UK) was used according to manufacturer’s instructions to remove the contaminating

LPS in venom or toxin solutions. LPS level was detected using Limulus Amoebocyte Lysate (BioWhittaker Inc., Walkersville, MD) http://www.selleckchem.com/products/azd5363.html as <0.8 pg/ml. Eagle medium and newborn calf serum were obtained from Invitrogen (Merelbeke, Belgium), laminin (354232, B&D), type I (234149) and type IV (234154) collagens (Calbiochem, La Jolla, California). Mouse anti-venom of T. nattereri, anti-natterins and anti-nattectin were produced by immunization of mouse with 10 μg of venom or toxins according to Piran-Soares et al. (2007). Anti-type I collagen (PA1-27396), anti-type IV collagen (SC9302),

and anti-laminin (PA116730) antibodies were from Santa Cruz Biotechnology, USA. PE-armenian hamster IgG anti-mouse CD29 (integrin β1, 120291), purified rat IgG2ak anti-mouse CD49e (integrin α5, 553318), and FITC mouse anti-rat IgG (H+L, 114811) were purchased from eBioscience (San Diego, CA). Assays with one selleck chemical ligand adsorbed to plastic microtitre wells were carried out according to Buzza et al. (2005) using established ELISA-type protocols. Microtitre plates (96-well; Costar, Cambridge, Sitaxentan MA, USA) were coated with type I collagen (3 μg/mL), type IV collagen (3 μg/mL), laminin (2 μg/mL) or BSA (1 μg/mL) (negative control) in PBS for 18 h at 4 °C. For blocking, the wells were washed with PBS, and incubated with 200 μL of 10% BSA in PBS for 3 h at 37 °C. After washing, T. nattereri venom (1 μg/mL) was added to each well for 3 h at 37 °C. Primary antibodies (mouse anti-T. nattereri

venom, anti-natterins, anti-nattectin, at 1 μg/mL) or goat anti-type I collagen, anti-type IV collagen, and anti-laminin (all at 1 μg/mL) were added to the plates and incubated for 1 h at room temperature. After washing and incubation for 1 h at room temperature with second antibodies (1/2000) anti-mouse or anti-goat IgG conjugated to horseradish peroxidase HRP (Amersham Biosciences) the absorbance of the specific binding was analyzed by spectrometry at 492 nm. The human adenocarcinoma cell line HeLa (CCL-2) was obtained from the American Type Culture Collection (ATCC, Manassas, VA, USA). Cells were grown at 37 °C in a humidified atmosphere with 5% CO2 in Eagle medium supplemented with 10% fetal calf serum according to Kalantarov and Acevedo (1998). For experiments, cells were used at 60–80% confluence in medium without supplements. Cells were detached with 0.05% trypsin/0.5 mM EDTA in PBS.