The pond smelt Hypomesus olidus and minnow Zacco platypus were collected from the Soyang and Daechung Lakes in January 2003, and their metacercarial infections was examined by the muscle compression and artificial digestion techniques. In the Soyang Lake, 161 metacercariae of Clonorchis sinensis (0.35 per fish) were harvested from 459 pond smelts examined. Also, 13 metacercariae of C. sinensis (0.43 per fish), 1 of Metagonimus sp., 4 of Echinostoma sp., 148 of Centrocestus armatus and 44 unidentified species were collected from 30 minnows. In the Daechung Lake, 369 metacercariae of C. sinensis (3.69 per fish) and 51 unidentified species were recovered from 100 pond smelts. The metacercariae of C. sinensis were fed to experimental rats, in which the adult flukes were identified. The pond smelts and minnows collected from the Soyang and Daechung Lakes were verified to be the second intermediate hosts and the sources of human C. sinensis infection.
Animals ; Clonorchiasis/parasitology/*veterinary ; Clonorchis sinensis/growth & development/*isolation & purification ; Cyprinidae/*parasitology ; Fish Diseases/parasitology ; Fresh Water ; Host-Parasite Relations ; Korea ; Osmeriformes/*parasitology ; Rats ; Rats, Sprague-Dawley

Dendritic cells (DCs), which are regarded as the most potent antigen-presenting cells, are involved in innate and adaptive immunity. Upon uptake of pathogens, DCs express cell surface markers and secrete cytokines. In this study, we analyzed production of cytokines and found that interleukin (IL)-10 and transforming growth factor (TGF)-beta production significantly increased in bone marrow-derived DCs and a mouse DC line, DC2.4, after treatment with crude antigen (CA) from liver fluke, Clonorchis sinensis. However, expression patterns of several activation molecules did not change. In addition, following treatment of DC2.4 cells with antigen from the lung fluke, Paragonimus westermani, production of IL-10 and TGF-beta significantly increased compared with groups treated with other parasite antigens, Spirometra erinacei plerocercoid CA and Echinococcus granulosus hydatid cystic fluid. We also found that treatment of DC2.4 cells with C. sinensis CA resulted in rapid and significant phosphorylation of extracellular signal-regulated kinase 1/2, a mitogen-activated protein kinase. Following treatment of DC2.4 cells with C. sinensis CA, treatment with an inhibitor specific to an extracellular signal-regulated kinase inhibited production of IL-10 and TGF-beta. Our results suggest that CA from C. sinensis has a role in the anti-inflammatory function of DC cells by inducing IL-10 and TGF-beta through activation of extracellular signal-regulated kinase 1/2.
Animals ; Antigens, Helminth/*pharmacology ; Cells, Cultured ; Clonorchis sinensis/*immunology ; Dendritic Cells/drug effects/*metabolism ; Interleukin-10/genetics/*metabolism ; MAP Kinase Signaling System ; Mice ; Transforming Growth Factor beta/genetics/*metabolism

Clonorchis sinensis is a biological carcinogen inducing human cholangiocarcinoma, and clonorchiasis is one of the important endemic infectious diseases in East Asia. The present study investigated survival longevity of C. sinensis adult worms in various in vitro conditions to find the best way of keeping the worms longer. The worms were maintained in 0.85% NaCl, 1xPBS, 1xLocke's solution, RPMI-1640, DMEM, and IMDM media, and in 1xLocke's solution with different supplements. All of the worms died within 3 and 7 days in 0.85% NaCl and 1xPBS, respectively, but survived up to 57 days in 1xLocke's solution. The worms lived for 106 days in DMEM, and 114 days in both RPMI-1640 and IMDM media. The survival rate in RPMI-1640 medium was the highest (50%) compared to that in DMEM (20+/-10%) and in IMDM (33.3+/-25.2%) after 3 months. The 1xLocke's solution with 0.005% bovine bile supplement showed increased duration of maximum survival from 42 days to 70 days. Higher concentration of bile supplements than 0.005% or addition of glucose were disadvantageous for the worm survival. The worms died rapidly in solutions containing L-aspartic acid, L-glutamic acid, and adenine compared to L-arginine, L-serine, and L-tryptophan. In conclusion, the 1xLocke's solution best supports the worms alive among inorganic solutions for 57 days, and the RPMI-1640 medium maintains living C. sinensis adults better and longer up to 114 days in vitro than other media.
Adenine/metabolism ; Amino Acids/metabolism ; Animals ; Bile/parasitology ; Bile Acids and Salts/*metabolism ; Cattle ; Cell Survival ; Clonorchiasis/*parasitology ; Clonorchis sinensis/*growth & development/physiology ; *Culture Media ; Cyprinidae ; Fish Diseases/parasitology ; Humans ; Rabbits ; Rats ; Time Factors

The writers have conducted the investigation to assess the nutritional status of young rural Korean children aged form 0 to 4 years old in August 1971. The survey areas were Kaejong-myon, Daeya-myon, Okku-gun, Jeonra-bukdo, Korea. These survey areas were typical agriculture plain areas. The total numbers of children examined were 2,706 comprising 1,394 male and 1,312 female. the weight, height, and chest circumference of children were measured and means and standard deviations were calculated for each measurement. In addition, the nutritional status of each child was classified by the four levels of malnutrition and the Gomez classification. The examination of red blood cell count, haematocrit value, and intestinal parasite infection were carried out at the same time. In general, recent work tend to suggest that environment influences, especially nutrition, are of great importance than genetic background or other biological factors for physical growth and development. Certainly the physical dimensions of the body are much influenced by nutrition, particularly in the rapidly growing period of early childhood. Selected body measurements can therefore give valuable information concerning protein-calory malnutrition. Growth can also be affected by bacterial, viral, and parasite infection. For the field workers in a developing country, therefore, nutritional anthropometry appears to be of greatest value in the assessment of growth failure and undernutrition, principally from lack of protein and calories. In order to compare and evaluate the data obtained, the optimal data of growth from the offspring of the true well-fed, medically and socially protected are needed, So-called "Standards" that have been compiled for preschool children in Korea, However, are based on measurement of children from middle or lower socio-economic groups, sho are in fact, usually undernourished from six months of age onwards and continuously exposed to a succession of infective and parasitic diseases. So that, the Harvard Standards which os one of the international reference standards was used as the reference standards in this study. Findings of the survey were as follows: A. Anthropometric data: 1) Comparing the mean values for body weight obtained with the Korean standard weight of the same age, the rural Korean children were slightly haevier than the Korean standard values in both sexes. Comparing with the Japanese children values, the rural Koran children were slightly haevier in male and in the infant period of female but lighter in female of the period of 1 to 4 years old than Japanese children. 2) Comparing the mean values for height obtained with the Korean standard height of the same age, the rural Korean children were taller than the Korean standard values except the second half of infant period in both sexes. Comparing with the Japanese children, the rural Korean children were slightly smaller than Japanese children except the first half of infant period in both sexes. 3)Mean values of chest circumference of rural Korean children obtained were less than the Korean standard values of the same ages in birth sexes. B. Prevalence of Protein-Calory Malnutrition: Children examined were divided into two groups, i. e. , infant (up to the first birthday) and toddler (1 to $ years old). 1) Percentage of four levels of malnutrition: a) when the nutritional status of each child was classified (1) by body weight value, the percentages for male and female of children attained standard value, the percentages for male and female of children attained standard growth were 52.8%(infant 83.3%, toddler 44.4%) and 39.7%(infant 74.5%, toddler 30.5%), the first level of malnutrition were 31.9% (infant 13.7%,toddler 36.9%) and 31.7%(infant 15.3%, toddler 36.0%), the second level of malnutrition were 12.3%(infant 1.7%, toddler 15.3%) and 23.3% (infant 7.7%, toddler 27.5%), the third level of malnutrition were 2.7%(infant 0.7%, toddler 3.2%) and 4.6%(infant 1.8%, toddler 5.3%) the fourth level of malnutrition were 0.3% (infant 0.7%, toddler 0.2%) and 0.7%(0.7% for infant and toddler) respectively. (2)by height value, the percentages for male and female of children attained standard growth were 80.3%(infant 97.3%, toddler 75.6%) and 75.1%(infant 96.4%, toddler 69.5%), the first levels of malnutrition were 17.9%(infant 2.0%, toddler 22.3%) and 23.6%(infant 3.6%, toddler 28.8%), the second level of malnutrition were 1.2%(infant 0.3%, toddler 1.5%) and 1.1%(infant 0%, toddler 1.4%), the third level of malnutrition were 0.4%(infant 0.3%, toddler 0.5%) and 0.2%(infant 0%, toddler 0.3%), the fourth level of malnutrition were 0.1%(infant 0%, toddler 0.1%) and 0% respectively. (3) By body weight in relation to height, the percentages for male and female of children attained standard growth were 87.9%(infant 77.6%, toddler 87.9%) and 78.2%(infant 77.4%, toddler 78.2%), the first level if malnutrition were 12.2%(infant 18.4%, toddler 10.6%) and 18.2%(infant 17.9%, toddler 18.3%), the second level of malnutrition were 1.9%(infant 3.3%, toddler 1.5%) and 3.0%(infant 3.3%, toddler 2.9%), the third level of malnutrition of malnutrition were 0.1%(infant 0.7%, toddler 0%)and 0.3%(infant 1.5%, toddler 0%) respectively. b) When the nutritional status of each child according to the mother's aged mother (31 to 40 years old) and old aged mother (41 years of above) was classified. (1) By body weight, among infants and toddlers, at each year of age, with increasing the mother's age, there was an increase in percentage of subjects underweight. This tendency of increasing percentage f underweight was more significant in the infant period than the toddler period. (2) By height value, no significant differences between each mother's age group were found. c) When the nutritional status of each child according to the birth rank, i. e. , lower birth rank(first to third) an higher birth rank(fourth of above) was classified. (1) By weight value, children of higher birth rank were slightly more often underweight than those of lower birth rank, but not significant. (2) By height value, no differences were found between children of lower and higher birth rank. 2) Gomez Classification: When the nutritional status of each child was classified a) By body weight value, the percentages for male and female of children, attained standard growth were 53.1%(infant 82.6%, toddler 44.9%) and 39.2%(infant 73.4%, toddler 30.1%), the first degree of malnutrition were 39.4%(infant 14.7%, toddler 46.2%) and 47.1%(infant 21.9%, toddler 53.8%), the second degree of malnutrition were 7.3%(infant 2.3%, toddler 8.6%) and 12.9%(infant 4.0%, toddler 15.2%), and the third degree of malnutrition were 0.2%(infant 0.3%, toddler 0.2%) and 0.8%(infant 0.7%, toddler 0.9%) respectively. b)By body weight value, the percentages for male and female of children, attained standard growth were 80.8%(infant 97.0%, toddler 76.3%) and 73.8%(infant 95.6%, toddler 68.0%), the first degree of malnutrition were 18.5%(infant 2.7%, toddler 22.9%) and 24.6%(infant 4.4%, toddler 30.0%), the second degree of malnutrition were 0.6%(infant 0.3%, toddler 0.7%) and 0.5%(infant 0.1%, toddler 0.7%), and the third degree of malnutrition were 0.1%(infant 0%, toddler 0.1%) and 1.1%(infant 0%, toddler 1.3%) respectively. C. Results of clinical laboratory examination: 1) Red blood cells: The range of mean red blood counts for male and female were 3,538,000/m3 to 4,483,000/m3 respectively. The lowest red cell counts were seen at the age of 0-3 months for male and 1-2 months for female. 2) Haematocrit value: The ranges of haematocrit value of male and female were 35.1% to 38.8% and 34.7% to 38.8% respectively. The lowest haematocrit values were seen at the age of 2-3 months for male and 1-2months for female. 3)The prevalence rates of intestinal parasites for male and female children with Ascaris lumbricoides were 34.1%(infant 18.8%, toddler 38.1%) and 36.0%(infant 18.4%, toddler 40.7%), with Trichocephalus trichiuris were 6.8%(infant 2.9%, toddler 7.9%) and 9.0%(infant 3.0%, toddler 10.6%), with Hookworm were 0.3%(infant 0.5%, toddler 0.2%)and 0.3%(infant 0.5%, toddler 0.3%), with Clonorchis sinensis were 0.4%(infant 0%, toddler 0.5%) and 0.1%(infant 0%, toddler 0.1%)respectively.
Agriculture ; Ancylostomatoidea ; Anthropometry ; Ascaris lumbricoides ; Asian Continental Ancestry Group ; Biological Factors ; Body Weight ; Cell Count ; Child* ; Child, Preschool ; Classification ; Clonorchis sinensis ; Developing Countries ; Erythrocyte Count ; Erythrocytes ; Female ; Growth and Development ; Health Personnel ; Humans ; Infant ; Korea* ; Male ; Malnutrition ; Mothers ; Nutritional Status* ; Parasites ; Parasitic Diseases ; Parturition ; Prevalence ; Thinness ; Thorax ; Trichuris