5, containing 1.19 mg/mL 5-Bromo-4-chloro-3-indolyl phosphate (BCIP, Sigma), 0,4 mg/mL Nitro

blue tetrazolium (NBT, Sigma) and 0.24 mg/mL levamisole (Sigma). The reaction was stopped by 15 minutes of incubation in 1 mM Tris-Hcl, 0.1 mM EDTA, pH 8. Sections were finally mounted in Permount (Fisher Scientific) and observed by light microscopy. The specific antibodies used were, three MABs (40E2, 40E10, 41B12), which were used as supernatant culture. The polyclonal antibody against penaeidin (25) was used at a concentration of 3 μg/mL of Tris buffer. The WSSV detection kit (DiagXotics) was used according to manufacturer’s instructions. Although some shrimp exhibited an initial WSSV infection, the number and level of shrimp displaying Stem Cell Compound Library ic50 WSD lesions

increased after induced infection from an index of 0.15 ± 0.66 to 1.3 ± 0.50 (24). The animals used to perform this study were selected on the basis of presence of LOS in the LO (24). Following the classification made by Hasson et al. (7), before infection the main type were A LOS, but after 24 hr the number of LOS increased and B LOS appeared, and 72 hr after infection B LOS were the total LOS type (100%). These animals exhibited in addition an increase of infiltrated hemocytes in tissues (24). Immunostaining with the five Protease Inhibitor Library antibodies used in this study was observed in the LO. Signals of hemocytes were detected in the lumen and stromal matrix of tubules as well as in hemal sinuses. Immunostaining Amisulpride also showed hemocyte degranulation in the stromal matrix and the tubule walls. Concerning LOS, we detected immunolabeling restricted to cytoplasmic vesicles with MABs 40E10, 41B12 and antipeneidin antibody. Positive staining for WSSV was observed in infected cells, in the outer tubule walls and vesicles of some LOS (Table 1 and 2). Before WSSV infection, the immunolabeling

was restricted to some infected cells of the epithelium and tegumental glands, but no immunolabeling was detected, either in the LO or LOS (Table 1). After the infection, the antibody against WSSV labeled the infected cells in several tissues, mainly epithelium and connective tissue. In the lymphoid organ this antibody strongly labeled the outer wall of tubules and some vesicles in the spheroids (Fig. 1a,b). Before the induced infection, staining for SGH was observed in some tubules of LO, and a well defined labeling of exocyted α2-macroglobulin was detected in the external stromal matrix with the MAB 41B12 (Table 1). After the induced infection, strong staining for SGH, and degranulated material was detected in the internal and external stromal matrix of tubules with the MAB 40E10 (Fig. 2a). LGH immunostained with the 40E2 MAB were mainly presented in the lumen, stromal matrix and hemal sinuses of LO. A low labeling was also observed in the fibrous material of outer tubule walls of LO (Fig. 2b).