TY - JOUR
T1 - Comparison of the peptidase activity in the oncosphere excretory/secretory products of Taenia solium and Taenia saginata
AU - Zimic, Mirko J.
AU - Infantes, Jesús
AU - López, César
AU - Velásquez, Jeanette
AU - Farfán, Marilú
AU - Pajuelo, Mónica
AU - Sheen, Patricia
AU - Verastegui, Manuela
AU - Gonzalez, Armando
AU - García, Hector H.
AU - Gilman, Robert H.
PY - 2007/8
Y1 - 2007/8
N2 - We compared the peptidase activities of the excretory/secretory (E/S) antigens of oncospheres of Taenia solium and related, but nonpathogenic, Taenia saginata. Taenia solium and T. saginata oncospheres were cultured, and the spent media of 24-, 48-, 72-, and 96-hr fractions were analyzed. Activities for serine peptidases (chymotrypsin-, trypsin-, and elastase-like), cysteine peptidases (cathepsin B-, cathepsin L-, and calpaine-like), and aminopeptidase (B-like peptidases) were tested fluorometrically with peptides coupled to 7-amino-4-methylcoumarin. In both species, the E/S antigens showed cysteine, serine, and aminopeptidase activities. Although no particular peptidase had high activity in T. solium, and was absent in T. saginata, or vice versa, different patterns of activity were found. A chymotrypsin-like peptidase showed the highest activity in both parasites, and it had 10 times higher activity in T. solium than in T. saginata. Trypsin-like and cathepsin B-like activities were significantly higher in T. solium. Minimal levels of cathepsin B were present in both species, and higher levels of elastase-like and cathepsin L-like activity were observed in T. saginata. Taenia solium and T. saginata have different levels and temporal activities of proteolytic enzymes that could play a modulator role in the host specificity for larval invasion through penetration of the intestinal mucosa.
AB - We compared the peptidase activities of the excretory/secretory (E/S) antigens of oncospheres of Taenia solium and related, but nonpathogenic, Taenia saginata. Taenia solium and T. saginata oncospheres were cultured, and the spent media of 24-, 48-, 72-, and 96-hr fractions were analyzed. Activities for serine peptidases (chymotrypsin-, trypsin-, and elastase-like), cysteine peptidases (cathepsin B-, cathepsin L-, and calpaine-like), and aminopeptidase (B-like peptidases) were tested fluorometrically with peptides coupled to 7-amino-4-methylcoumarin. In both species, the E/S antigens showed cysteine, serine, and aminopeptidase activities. Although no particular peptidase had high activity in T. solium, and was absent in T. saginata, or vice versa, different patterns of activity were found. A chymotrypsin-like peptidase showed the highest activity in both parasites, and it had 10 times higher activity in T. solium than in T. saginata. Trypsin-like and cathepsin B-like activities were significantly higher in T. solium. Minimal levels of cathepsin B were present in both species, and higher levels of elastase-like and cathepsin L-like activity were observed in T. saginata. Taenia solium and T. saginata have different levels and temporal activities of proteolytic enzymes that could play a modulator role in the host specificity for larval invasion through penetration of the intestinal mucosa.
UR - http://www.scopus.com/inward/record.url?scp=34848840608&partnerID=8YFLogxK
U2 - 10.1645/GE-959R.1
DO - 10.1645/GE-959R.1
M3 - Artículo
C2 - 17918349
AN - SCOPUS:34848840608
SN - 0022-3395
VL - 93
SP - 727
EP - 734
JO - Journal of Parasitology
JF - Journal of Parasitology
IS - 4
ER -