RESUMO
BACKGROUND: Transforming growth factor (TGF)-beta1 inhibits hepatocyte proliferation by inducing apoptosis. Expression of TGF-beta1 is tightly associated with the TGF-betatype II receptor (TGR2) expression level, and has been regarded as an important change of TGF-beta1 and TGR2 during hepatocarcinogenesis. We investigated the gene expressions and protein localizations of TGF-beta1 and TGR2 in chemical hepatocarcinogenesis. METHODS: Solt and Farber's method was used as the chemical hepatocarcinogenesis model of the rat. Northern blot analyses and immunohistochemistry for TGF-beta1 and TGR2 were performed to investigate the gene expressions and protein localizations, respectively. RESULTS: The Northern blot analyses showed a slight increase of TGF-beta1 transcripts one month after partial hepatectomy, which is more than in sham operated control liver, and a decrease of transcripts for TGR2 two months after partial hepatectomy. The number of TGF-beta-positive preneoplastic hepatocytes was increased and correlated with the increase of the number of TGR2 negative hepatocytes or reduction of expressions of TGR2 in preneoplastic lesions. HCC tissues showed an increase of TGF-beta1 protein expressions and a decrease of TGR2 compared to the adjacent liver parenchyme. CONCLUSION: Our data suggest that down regulation of TGR2 in preneoplastic lesions and HCC might contribute to the resistance to the growth inhibitory effects of TGF-beta.
Assuntos
Animais , Ratos , Apoptose , Northern Blotting , Regulação para Baixo , Expressão Gênica , Hepatectomia , Hepatócitos , Imuno-Histoquímica , Fígado , Fator de Crescimento Transformador beta , Fator de Crescimento Transformador beta1 , Fatores de Crescimento TransformadoresRESUMO
The purpose of this study is to verify severity of asthma in asthmatic patients through through the arterial blood gas analysis. Subjects were consisted of 103 patients (74 boys and 29 girls), between 2~13 years of ages. Clinically, asthmatic patients were classified into 6 groups, i, e., group 0(no rhonchi), group 1(rhonchi only), group 2(mild attack), group 3(moderate attack), group 4(severe attack), group 5(respiratory failure with disturbance of consciousness). PH kept normal range in the group 0, group 1, group 1 and group 3,but began decrease in the group 4.There was linear fall in Po2 and began decrease in the group 3. HCO3- maintained normal level through the whole range. BE showed acidemia on the whole, and began distinctive decrease in the group 4 and group 5, especially. Hypoxemia, hypercapnia and acidemia were common in patients in severe attacks with disturbance of consciousness.