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Korean J Parasitol > Volume 35(4):1997 > Article

Original Article
Korean J Parasitol. 1997 Dec;35(4):239-244. English.
Published online Dec 20, 1997.  http://dx.doi.org/10.3347/kjp.1997.35.4.239
Copyright © 1997 by The Korean Society for Parasitology
Expression patterns of proliferating cell nuclear antigen in the small intestine of mice infected with Metagonimus yokogawai and Metagonimus Miyata type
J R Yu,*1N Myong,2 and J Y Chai3
1Department of Parasitology, College of Medicine, Kon-Kuk University, Chungju 380-701, Korea.

*Corresponding author (Email: yu@kcucc.konkuk.ac.kr)
Received August 25, 1997; Accepted October 06, 1997.


Genus Metagonimus has been a subject of taxonomic debates for several years. In morphological aspects, M. yokogawai has been thought to have three subtypes, namely Yokogawa type (M. yokogawai in strict sense), Miyata type and Koga type, But differences in the intestinal pathology induced by these subtypes have not been studied yet. In this study we compared the pathological reactions induced by M. yokogawai and Metagonimus Miyata type using proliferating cell nuclear antigen (PCNA) index. Metacercariae (Mc) of M. yokogawai were collected by artificial digestion of Plecoglossus altivelis and Mc of Metagonimus Miyata type were collected from Zacco platypus. Three hundreds Mc of each species were infected orally to ICR mice. The mice were sacrificed at 3, 6, 10, 16 and 23 days after infection and the small intestines were resected into three portions (proximal, middle, and distal). Immunohistochemical staining for PCNA was done using PC-10 (DAKO-PCNA, CA, USA). The PCNA indices in M. yokogawai infected group on the 6th and 23rd day after infection were lower than in the control and Miyata type infected groups (p < 0.05) from all of the three intestinal regions. On the other hand, the control group and Metagonimus Miyata type infected group did not make any differences in PCNA indices. The villus/crypt (V/C) ratio was also decreased significantly in M. yokogawai infected mice but not in Metagonimus Miyata type infected ones. It is suggested that M. yokogawai induce villous atrophy through a decrease in the cell proliferation at the crypt. The results of this study suggested that M. yokogawai induce more serious intestinal pathology than Metagonimus Miyata type.


Fig. 1
Preparation of the small intestine of infected mice. P, Proximal small intestine; M, middle small intestine; D, distal small intestine.

Fig. 2
Small intestine of mice stained at PCNA.

Fig. 3
Comparison of PCNA indices among experimental groups in the proximal jejunum of mice. MY, M. yokogawai infected group; MM, Metagonimus Miyata type infected group. *p<0.05, student's t-test.

Fig. 4
Comparison of PCNA indices among experimental groups in the middle intestine of mice. MY, M. yokogawai infected group; MM, Metagonimus Miyata type infected group. *p<0.05, student's t-test.

Fig. 5
Comparison of PCNA indices among expermental groups in the distal small intestine of mice. MY, M. yokogawai infected group; MM, Metagonimus Miyata type infected group. *p<0.05, student's t-test.


Table 1
The number of mice used for this experiment

Table 2
Comparative valuesa) of V/C ratio among experimental groups

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