Expression Patterns of Cytokeratin and Involucrin in the Epidermis of the Artificial Skin Reconstructed by Cultured Cells / 체질인류학회지

To investigate differentiation and growth process of keratinocytes in organotypic cultured skin, we carried out immunohistochemical studies for cytokeratin (CK) 10, 14, 16, 17 and involucrin in the cultured skin. In normal skin CK14 and CK10 were detected in the basal and all suprabasal layer, respectively, whereas in artificial skin CK14 was detected up to the middle of spinous layer but CK10 expressed from the middle of spinous layer. The detection of involucrin in normal skin was from the upper spinous layer but found from lower spinous layer in the artificial skin. Both CK16 and CK17 did not expressed in in vivo skin but expressed weakly in the spinous layer of artificial skin. It is therefore concluded that the characteristics of basal cell were maintained in the several, lower layers of the sartificial skin. The growth and differentiation steps of the skin were similar to those of in vivo although differences were seen in the expression level.

Serotype and Nucleotide Analysis of Human Rotavirus Isolates in Korea

Rotaviruses belong to Reoviridae causes diarrhea in human beings as well as domestic animals. This study was conducted to see what type of human rotaviruses are distributed in Seoul and Kyung-gi province. Twenty two of 81 patients showed rotavirus positive with diagnostic kit and RNA electropherosis. We isolated all of rotaviruses from the patients. Electropherotypes of 22 isolates showed 4:2:3 :2 patters whereas those migration patterns were long type. All of those isolates belonged to group 4. Twenty out of 22 isolates reacted with monoclonal antibodies specific to G1, P1A and subgroup II, whereas rest of them, 4-29 and K-30 reacted with subgroup I specific monoclonal antibody. The nucleotide sequence of an isolate K-21 showed 98~100% and 90~96% homologies with those of Wa and KU strain, respectively.

Effect of Bovine and Human Lactoferrin on MA 104 Cell Infected with Human Rotavirus

It has long been known that lactoferrin prevents human beings from infection of virus. To prove this activity of lactoferrin, we evaluated the activities of different lactoferrins to an isolate human rotavirus K-21. Bovine lactoferrin inhibited infection of K-21 to MA-104 cell at the concentration of 25.9 microM whereas bovine hydrolysed lactoferrin prevented rotavirus infection at 103.8 microM. However human lactoferrin prevented infection of K-21 at the concentration of 217.5 microM. These data suggested that lactoferrin activity may be unaffected by the intestinal digestive enzymes and bovine lactoferrin is more active than human lactoferrin with respect to prevention of rotavirus infection.

Serotype and Nucleotide Analysis of Human Rotavirus Isolates in Korea

Rotaviruses belong to Reoviridae causes diarrhea in human beings as well as domestic animals. This study was conducted to see what type of human rotaviruses are distributed in Seoul and Kyung-gi province. Twenty two of 81 patients showed rotavirus positive with diagnostic kit and RNA electropherosis. We isolated all of rotaviruses from the patients. Electropherotypes of 22 isolates showed 4:2:3 :2 patters whereas those migration patterns were long type. All of those isolates belonged to group 4. Twenty out of 22 isolates reacted with monoclonal antibodies specific to G1, P1A and subgroup II, whereas rest of them, 4-29 and K-30 reacted with subgroup I specific monoclonal antibody. The nucleotide sequence of an isolate K-21 showed 98~100% and 90~96% homologies with those of Wa and KU strain, respectively.

Effect of Bovine and Human Lactoferrin on MA 104 Cell Infected with Human Rotavirus

It has long been known that lactoferrin prevents human beings from infection of virus. To prove this activity of lactoferrin, we evaluated the activities of different lactoferrins to an isolate human rotavirus K-21. Bovine lactoferrin inhibited infection of K-21 to MA-104 cell at the concentration of 25.9 microM whereas bovine hydrolysed lactoferrin prevented rotavirus infection at 103.8 microM. However human lactoferrin prevented infection of K-21 at the concentration of 217.5 microM. These data suggested that lactoferrin activity may be unaffected by the intestinal digestive enzymes and bovine lactoferrin is more active than human lactoferrin with respect to prevention of rotavirus infection.