RESUMEN
OBJECTIVE: To investigate the effects of catalase on the mitochondria and apoptotic behavior of SW480 cells treated by lipopolysaccharide (LPS), and the changes in intracellular expression of nuclear factor kappaB (NF-kappaB). METHODS: LPS-stimulated SW480 cells were treated with catalase and the changes in their mitochondria and apoptotic behavior were observed by transmission electron microscopy. The expression of NF-kappaB was detected by immunohistochemical method. RESULTS: Mitochondria damages and apoptosis were slightly diminished in the LPS-stimulated cells with catalase pretreatment, and the NF-kappaB expression was also decreased. CONCLUSION: Catalase protect the mitochondria of SW480 cells from damages by LPS and inhibit the cell apoptosis, possibly due to the activation of NF-kappaB.
Asunto(s)
Apoptosis/efectos de los fármacos , Catalasa/farmacología , Neoplasias del Colon/patología , Mitocondrias/metabolismo , Línea Celular Tumoral , Neoplasias del Colon/metabolismo , Humanos , Lipopolisacáridos , FN-kappa B/biosíntesis , FN-kappa B/genéticaRESUMEN
OBJECTIVE: To investigate the effects of recombinant Helicobacter pylori catalase (rHpCAT)on oxidative stress in rat colonic mucosal epithelial cells. METHODS: Oxidative stress model was established by hydroxyl generated from Fenton reaction in cultured colonic mucosal epithelial cells isolated from normal rats, in the model of which the effects of rHpCAT were observed. The cells were divided into normal control, model, 5-aminosalicylic acid (5-ASA, 0.1 mmol/L), and rHpCAT (1 x 10(5), 1 x 10(6), and 1 x 10(7) U/kg, respectively) groups. At the end of the experiment, the content of lactic dehydrogenase (LDH), malondialdehyde (MDA), myeloperoxidase (MPO), glutathione peroxidase (GSH-Px), catalase (CAT) and, superoxide dismutase (SOD) were detected in the culture supernatant. RESULTS: The contents of LDH, MDA and MPO were elevated while those of GSH-Px, CAT and SOD reduced in the model group. rHpCAT at different doses reduced the release of LDH, depressed the contents of MDA and MPO, and increased the contents of GSH-Px, SOD and CAT. CONCLUSION: rHpCAT has protective effects against rat colonic mucosal oxidative damage.
Asunto(s)
Catalasa/farmacología , Colon/metabolismo , Helicobacter pylori/enzimología , Estrés Oxidativo/efectos de los fármacos , Animales , Catalasa/biosíntesis , Catalasa/genética , Células Cultivadas , Colon/citología , Femenino , Mucosa Intestinal/citología , Mucosa Intestinal/metabolismo , Masculino , Ratas , Ratas Sprague-Dawley , Proteínas Recombinantes/biosíntesis , Proteínas Recombinantes/genética , Proteínas Recombinantes/farmacologíaRESUMEN
AIM: To express Hsp60 protein of H pylori by a constructed vector and to evaluate its immunogenicity. METHODS: Hsp60 DNA was amplified by PCR and inserted into the prokaryote expression vector pET-22b (+), which was transformed into BL21 (DE3) E.coli strain to express recombinant protein. Immunogenicity of expressed Hsp60 protein was evaluated with animal experiments. RESULTS: DNA sequence analysis showed Hsp60 DNA was the same as GenBank's research. Hsp60 recombinant protein accounted for 27.2% of the total bacterial protein, and could be recognized by the serum from H pylori infected patients and Balb/c mice immunized with Hsp60 itself. CONCLUSION: Hsp60 recombinant protein might become a potential vaccine for controlling and treating H pylori infection.