RESUMO
Bovine spongiform encephalopathy (BSE) is one of the fatal neurodegenerative diseases known as transmissible spongiform encephalopathies (TSEs) caused by infectious prion proteins. Genetic variations correlated with susceptibility or resistance to TSE in humans and sheep have not been reported for bovine strains including those from Holstein, Jersey, and Japanese Black cattle. Here, we investigated bovine prion protein gene (PRNP) variations in Hanwoo cattle [Bos (B.) taurus coreanae], a native breed in Korea. We identified mutations and polymorphisms in the coding region of PRNP, determined their frequency, and evaluated their significance. We identified four synonymous polymorphisms and two non-synonymous mutations in PRNP, but found no novel polymorphisms. The sequence and number of octapeptide repeats were completely conserved, and the haplotype frequency of the coding region was similar to that of other B. taurus strains. When we examined the 23-bp and 12-bp insertion/deletion (indel) polymorphisms in the non-coding region of PRNP, Hanwoo cattle had a lower deletion allele and 23-bp del/12-bp del haplotype frequency than healthy and BSE-affected animals of other strains. Thus, Hanwoo are seemingly less susceptible to BSE than other strains due to the 23-bp and 12-bp indel polymorphisms.
Assuntos
Animais , Bovinos , Sequência de Bases , DNA/genética , Encefalopatia Espongiforme Bovina/genética , Variação Genética , Haplótipos , Príons/genética , República da CoreiaRESUMO
The immunomodulatory and antitumor effects of lactic acid bacteria (LABs) were investigated. Cytoplasmic fraction of Lactobacillus acidophilus, Lactobacillus casei and Bifidobacterium longum were tested for the antiproliferative activity in vitro to SNUC2A, SNU1, NIH/3T3 and Jurkat cell lines by crystal violet assay. All cytoplasmic fraction suppressed proliferation of tumor cells, though L. casei and B. longum were more effective. From these results, cytoplasmic fraction of L. casei and B. longum with Y400 as a control were administered as dietary supplements to Balb/c mice for 2, and 4 consecutive wks. Administration for 4 wks enhanced the number of total T cells, NK cells and MHC class II+ cells, and CD4-CD8+ T cells in flow cytometry analysis. To determine of antitumor activity of LABs preparation in vivo, F9 teratocarcinoma cells were inoculated on mice at 14th day. Body weight was decreased with increased survival rate in all groups with the cytoplasm of LABs. Our results showed that cytoplasmic fraction of LABs had direct antiproliferative effects on tumor cell lines in vitro, effects on immune cells in vivo, and antitumor effects on tumor-bearing mice with prolonged survival periods.
Assuntos
Animais , Humanos , Masculino , Camundongos , Células 3T3 , Bifidobacterium , Peso Corporal , Divisão Celular/fisiologia , Citotoxicidade Imunológica , Citometria de Fluxo , Imunofenotipagem , Células Jurkat , Células Matadoras Naturais/imunologia , Lacticaseibacillus casei , Camundongos Endogâmicos BALB C , Neoplasias Experimentais/imunologia , Probióticos/farmacologia , Análise de Sobrevida , Linfócitos T/imunologiaRESUMO
"It is not clear yet how the laminin is made in cytoplasm and is secreted by cells, though the significance of the interaction between laminin and cells during the development, cell differentiation, tumor growth, and metastasis is well known. Furthermore, it has been reported that aberrant expression. and secretion of laminin in malignant tumor cells, In this study I found a major cytoplasmic laminin binding protein (LBP), which was revealed as the heat shock cognate protein 70 (hsc70), in human colon carcinoma cells by cell surface labeling with '""I, laminin and gelatin affinity chromatography, peptide microsequencing, and immunoblot experiments. This suggests another function of hsc70 as the cytoplasmic LBP, which may play an important role in biosynthesis, assembly, and secretion of laminin in tumor cells."
Assuntos
Humanos , Proteínas de Transporte , Diferenciação Celular , Cromatografia de Afinidade , Colo , Citoplasma , Gelatina , Temperatura Alta , Laminina , Metástase Neoplásica , ChoqueRESUMO
Gastric cancer cells express large amounts of galectin-3 on the cell surface. This fact may provide the possibility to use galectin-3 protein as a surface target for delivering cytotoxic anticancer agents. To investigate the possibility of application of galectin-3 protein as a target protein in delivering cytotoxic anticancer agents, we synthesized doxorubicin immunoconjugate by using maleimidocaproic acid and conjugated doxorubicin immunoconjugate to anti-galectin-3 mAb. The anticancer effect of immunotoxin was assayed on NIH3T3, AGS and KATO III cell lines. The anticancer effect of immunotoxin on AGS cell line is highest and that of KATO III is higher than that of NIH3T3. This results relate to that of flow cytometry analysis previously shown and indicate that galectin-3 protein can be used as a target protein on the surface of gastric cancer cell for delivering cytotoxic anticancer agents.