Trypanosoma evansi: cholinesterase activity in acutely infected Wistar rats.
The aim of this study was to evaluate cholinesterase activity during the early acute phase of Trypanosoma evansi infection in rats. Fifteen male Wistar rats were randomly distributed into three groups (n=5 animals per group): two trypanosome-infected groups (T3 and T5) and uninfected controls (C). The animals were inoculated intraperitoneally with 10(6) trypanosomes. The blood was collected by cardiac puncture on the 3rd (T3) or 5th day post-infection (T5 and C). Cerebrum and cerebellum were removed for the evaluation of acetylcholinesterase (AChE) activity. AChE activity was also evaluated in whole blood and butyrylcholinesterase activity (BUChE) in plasma samples. Parasitemia were progressive increase and parasites were observed in the peripheral blood of all infected animals one day post-inoculation. AChE activity was not altered in cerebrum and cerebellum tissues. AChE activity in blood significantly decreased in the T3 and T5 groups (26.63 and 25.86mU/lmolHb) compared with the control (37.84mU/lmolHb). In addition BUChE activity in plasma was lower in the T3 (7.01micromol BTC hydrolyzed/h/mL) than the T5 and C groups (9.84 and 12.00micromol BTC hydrolyzed/h/mL). This study therefore, shows that reductions in the activity of cholinesterase occur in acute infection by T. evansi in rats and this demonstrates an important change occurring in animals infected by the protozoan and may indicate a potential role the enzymes play in the mechanism of disease.
Laboratory of Veterinary Clinical Analysis, Universidade Federal de Santa Maria - UFSM, Santa Maria, RS, Brazil. patiwol@hotmail.com
Patrícia
P
Wolkmer
Sonia Terezinha dos Anjos
ST
Lopes
Carina
C
Franciscato
Aleksandro Schafer
AS
da Silva
Carolina Kist
CK
Traesel
Lucas Carvalho
LC
Siqueira
Maria Ester
ME
Pereira
Sílvia Gonzalez
SG
Monteiro
Cinthia Melazzo de Andrade
CM
Mazzanti
D000110:Acetylcholinesterase / Q000097:blood / Q000378:metabolism*; D000208:Acute Disease; D000704:Analysis of Variance; D000818:Animals; D002091:Butyrylcholinesterase / Q000097:blood; D020808:Central Nervous System Protozoal Infections / Q000201:enzymology* / Q000469:parasitology; D002531:Cerebellum / Q000201:enzymology; D054022:Cerebrum / Q000201:enzymology; D004195:Disease Models, Animal; D008297:Male; D018512:Parasitemia / Q000201:enzymology / Q000469:parasitology; D011897:Random Allocation; D051381:Rats; D017208:Rats, Wistar; D014345:Trypanosoma / Q000201:enzymology*; D014352:Trypanosomiasis / Q000097:blood / Q000201:enzymology* / Q000469:parasitology
D000110:Acetylcholinesterase; D002091:Butyrylcholinesterase