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Zheng LL, Chen R, Zheng CH, Dai XJ, Zheng WD, Zhang JX. The correlation between lung ultrasound scores and outcomes of high-flow nasal cannula therapy in infants with severe pneumonia. BMC Pediatr 2024; 24:51. [PMID: 38229006 DOI: 10.1186/s12887-024-04522-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/27/2023] [Accepted: 01/01/2024] [Indexed: 01/18/2024] Open
Abstract
OBJECTIVE The study aimed to explore the effectiveness of bedside lung ultrasound (LUS) combined with the PaO2/FiO2 (P/F) ratio in evaluating the outcomes of high-flow nasal cannula (HFNC) therapy in infants with severe pneumonia. METHODS This retrospective study analyzed the clinical data of 150 infants diagnosed with severe pneumonia and treated with HFNC therapy at our hospital from January 2021 to December 2021. These patients were divided into two groups based on their treatment outcomes: the HFNC success group (n = 112) and the HFNC failure group (n = 38). LUS was utilized to evaluate the patients' lung conditions, and blood gas results were recorded for both groups upon admission and after 12 h of HFNC therapy. RESULTS At admission, no significant differences were observed between the two groups in terms of age, gender, respiratory rate, partial pressure of oxygen, and partial pressure of carbon dioxide. However, the P/F ratios at admission and after 12 h of HFNC therapy were significantly lower in the HFNC failure group (193.08 ± 49.14, 228.63 ± 80.17, respectively) compared to the HFNC success group (248.51 ± 64.44, 288.93 ± 57.17, respectively) (p < 0.05). Likewise, LUS scores at admission and after 12 h were significantly higher in the failure group (18.42 ± 5.3, 18.03 ± 5.36, respectively) than in the success group (15.09 ± 4.66, 10.71 ± 3.78, respectively) (p < 0.05). Notably, in the success group, both P/F ratios and LUS scores showed significant improvement after 12 h of HFNC therapy, a trend not observed in the failure group. Multivariate regression analysis indicated that lower P/F ratios and higher LUS scores at admission and after 12 h were predictive of a greater risk of HFNC failure. ROC analysis demonstrated that an LUS score > 20.5 at admission predicted HFNC therapy failure with an AUC of 0.695, a sensitivity of 44.7%, and a specificity of 91.1%. A LUS score > 15.5 after 12 h of HFNC therapy had an AUC of 0.874, with 65.8% sensitivity and 89.3% specificity. An admission P/F ratio < 225.5 predicted HFNC therapy failure with an AUC of 0.739, 60.7% sensitivity, and 71.1% specificity, while a P/F ratio < 256.5 after 12 h of HFNC therapy had an AUC of 0.811, 74.1% sensitivity, and 73.7% specificity. CONCLUSION Decreased LUS scores and increased P/F ratio demonstrate a strong correlation with successful HFNC treatment outcomes in infants with severe pneumonia. These findings may provide valuable support for clinicians in managing such cases.
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Affiliation(s)
- Li-Ling Zheng
- Department of Pediatric Intensive Care Unit, Zhangzhou Affiliated Hospital, Fujian Medical University, 59 Shengli West Road, Xiangcheng District, Zhangzhou, China
| | - Rou Chen
- Department of Pediatric Intensive Care Unit, Zhangzhou Affiliated Hospital, Fujian Medical University, 59 Shengli West Road, Xiangcheng District, Zhangzhou, China
| | - Chan-Hua Zheng
- Department of Pediatric Intensive Care Unit, Zhangzhou Affiliated Hospital, Fujian Medical University, 59 Shengli West Road, Xiangcheng District, Zhangzhou, China
| | - Xiao-Juan Dai
- Department of Pediatric Intensive Care Unit, Zhangzhou Affiliated Hospital, Fujian Medical University, 59 Shengli West Road, Xiangcheng District, Zhangzhou, China
| | - Wei-Da Zheng
- Department of Pediatric Intensive Care Unit, Zhangzhou Affiliated Hospital, Fujian Medical University, 59 Shengli West Road, Xiangcheng District, Zhangzhou, China
| | - Jia-Xiang Zhang
- Department of Pediatric Intensive Care Unit, Zhangzhou Affiliated Hospital, Fujian Medical University, 59 Shengli West Road, Xiangcheng District, Zhangzhou, China.
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Abstract
MicroRNAs regulate target gene expression and are involved in cell proliferation, apoptosis, differentiation, tumor invasion, and cancer stem cell regulation, among other processes. MicroRNA-26b (miR-26b) is closely related to tumor occurrence and development. In this study, we analyzed miR-26b expression in osteosarcoma tissue, its effect on Saos-2 osteosarcoma cell proliferation and invasion, and its relationship with 6-phosphofructo-2-kinase/fructose-2,6-biphosphatase 3 (PFKFB3) expression. Osteosarcoma tissue was obtained from surgical patients and normal tissue adjacent to the tumor was used as a control. Real-time polymerase chain reaction was applied to detect miR-26b expression in cancer tissue and normal tissue. A vector expressing miR-26b was constructed and transfected into Saos-2. An MTT assay, cell invasion assay, and scratch experiment were used to analyze the effect of miR-26b on Saos-2 cell proliferation, invasion, and migration abilities. Western blotting analysis was performed to investigate the role of miR-26b on PFKFB3 expression. miR-26b expression in normal tissue was 7.55-fold higher than in osteosarcoma tissue (t = 10.20, P = 0.006). Compared with control tissue, miR-26b significantly inhibited osteosarcoma proliferation, migration, and invasion (P < 0.05). Western blotting results revealed that PFKFB3 protein expression decreased in Saos-2 cells after transfection with miR-26b. miR-26b was down-regulated in osteosarcoma tissue. miR- 26b may inhibit osteosarcoma cell proliferation, migration, and invasion by regulating PFKFB3 protein expression. miR-26b may have a tumor suppressor role in tumor occurrence and development.
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Affiliation(s)
- W D Zheng
- Department of Orthopaedic and Trauma Surgery, Jining No.1 People's Hospital, Jining, Shandong ,China
| | - F L Zhou
- Foundation College of Jining Medical University, Jining, Shandong, China
| | - N Lin
- Foundation College of Jining Medical University, Jining, Shandong, China
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Chen YX, Huang YH, Zheng WD, Chen ZX, Zhang LJ, Wang XZ. Interleukin-10 gene modification attenuates hepatocyte activation of rat hepatic stellate cells in vitro. Mol Med Rep 2012; 7:371-8. [PMID: 23232951 DOI: 10.3892/mmr.2012.1228] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2012] [Accepted: 11/06/2012] [Indexed: 12/13/2022] Open
Abstract
Activation of hepatic stellate cells (HSCs) plays a key role in the progression of liver fibrosis. Interleukin-10 (IL-10), a potential anti-fibrosis cytokine, has an unfavorable pharmacokinetic profile, which limits its clinical applications. A liver-targeting gene delivery system may maintain a longer-lasting concentration in hepatic tissue with fewer side‑effects in non-target tissues. In the present study, when delivered by asialoglycoprotein receptor-mediated liposomes, the IL-10 gene was highly expressed in BRL cells (a rat hepatocyte line) and attenuated the apoptosis of BRL cells induced by plasmid transfection. In a co-culture system, BRL cells demonstrated a marked ability to stimulate the proliferation of primary HSCs and their expression of α-SMA and procollagen type I. Following modification of the BRL cells with the IL-10 gene, this stimulation was attenuated and an accelerated apoptosis of the HSCs was induced. These results suggest that hepatocyte‑targeting gene delivery may be an ideal technique for the IL-10 gene therapy of liver fibrosis, which requires further confirmation by in vivo studies.
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Affiliation(s)
- Yun-Xin Chen
- Department of Gastroenterology, Union Hospital of Fujian Medical University, Fuzhou 350001, Fujian, P.R. China
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Zhang LJ, Zheng WD, Chen YX, Huang YH, Chen ZX, Zhang SJ, Shi MN, Wang XZ. Antifibrotic effects of interleukin-10 on experimental hepatic fibrosis. Hepatogastroenterology 2007; 54:2092-2098. [PMID: 18251166] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
BACKGROUND/AIMS To study the effects of interleukin-10 on hepatic stellate cells and liver tissue in experimental rats hepatic fibrosis. METHODOLOGY Rat hepatic fibrosis model induced by carbon tetrachloride was established. Liver tissues were harvested from the rats administered CCl4 with or without IL-10 treatment and the animals of the control group. The expression of TGF-beta1, MMP-2 and TIMP-1 in the liver tissues was measured by S-P immunohistochemistry. In addition, another model was established; HSCs in rats in each group were isolated. RT-PCR was employed to analyze TGF-beta1, MMP-2 and TIMP-1 mRNA expression in cells and immunocytochemistry was performed to detect protein expression of alpha-SMA, NF-kappaB, TGF-beta1, MMP-2 and TIMP-1 in HSCs. RESULTS Rat hepatic fibrosis was developed successfully. The fibrosis changes were partially reversed by simultaneous administration of IL-10. The positive signals of TGF-beta1, MMP-2 and TIMP-1 were observed more frequently (P<0.05) in the CCl4-treated group compared to those in the IL-10-treated group and the control group. HSCs were successfully isolated. TGF-beta1, MMP-2 and TIMP-1 mRNA in HSCs increased obviously during the course of hepatic fibrosis, and their levels were decreased after the treatment with IL-10 (P<0.05). The immunocytochemistry positive levels for TGF-beta1, MMP-2, TIMP-1, alpha-SMA and NF-kappaB in the fibrogenesis group were increased significantly compared to the normal group (P<0.01). The positive signals decreased significantly (P<0.05) after the treatment with IL-10. CONCLUSIONS The expression of TGF-beta1, MMP-2 and TIMP-1 increased in liver or in HSC of hepatic fibrosis rats and decreased after treatment with IL-10. The IL-10 could inhibit the activation of HSCs and make an antifibrogenic process come into effect in this way.
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Affiliation(s)
- Li-Juan Zhang
- Department of Gastroenterology, Union Hospital of Fujian Medical University, Fuzhou 350001, Fujian Province, China
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Chen DF, Li JY, Zheng WD, Chen ZX, Wang XZ. Effects of exogenous transforming growth factor-β 1 on the activation of primarily cultured rat hepatic stellate cells. Shijie Huaren Xiaohua Zazhi 2007; 15:211-215. [DOI: 10.11569/wcjd.v15.i3.211] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Abstract
AIM: To investigate the activation of primarily cultured hepatic stellate cells (HSCs) at different differentiated stages after treatment of exogenous transforming growth factor-β1 (TGF-β1) and the alterations of related factors during this process.
METHODS: HSCs were isolated from normal rats and primarily cultured in the uncoated plastics for 2, 3, 4, 5, 6, and 7 days. Then the cells were incubated with 5 μg/L exogenous TGF-β1 for 24 hours. The morphological features of the cells were observed under inverted microscope. Western blot was used to detect the changes of a-smooth muscle actin (a-SMA) after TGF-β1 treatment and the expression of transforming growth factor β1 recepter-Ⅱ (TβR-Ⅱ) during the activation of HSCs.
RESULTS: During the process of in vitro cultivation, HSCs at different differentiated stages showed different responses to exogenous TGF-β1 treatment. TGF-β1 promoted the activation of HSCs after the cells had been cultured for 2, 3, 4, and 5 days. The cells cultured for 3 days were the most sensitive to TGF-β1, and the level of a-SMA expression was increasd by 78.05%. The changes of HSC morphology and a-SMA expression were not significant in the cells cultured for 6 and 7 days. TβR-Ⅱ expression was significantly higher in HSCs cultured for 7 days than that in ones cultured for 3 days (3.30 ± 0.83 vs 1.55 ± 0.38, P < 0.05).
CONCLUSION: The activation of partially-activated HSCs can be promoted by exogenous TGF-β1, while the fully-activated HSCs lose this response. The amount of TβR-Ⅱ expression is not involved in this difference.
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Abstract
AIM: To study the effect of interleukin-10 (IL-10) on the expression of transforming growth factor β1 (TGF-β1) in hepatic fibrosis rats and the anti-fibrotic role of exo-genous IL-10.
METHODS: Hepatic fibrosis was induced by carbon tetrachloride administered (CCl4) intraperitoneally. The experiment was performed in two stages. In the first stage, 60 SD rats were divided randomly into normal control group 1(GN1, n = 8), hepatic fibrosis group(GC, n = 28)and IL-10 intervened group(GI, n = 24). At the beginning of the 7th and 11th wk, hepatic stellate cells (HSCs) were isolated, reverse transcription-polymerase chain reation (RT-PCR) and immunocytochemistry were performed to detect the expression of TGF-β1 in HSCs. Histological examination was used to determine the degree of hepatic fibrosis. In the second stage, 47 SD rats were divided randomly into normal control group 2(GN2, n = 6)and CCl4 group(GZ, n = 41). At the end of the 9th week, rats in GZ group were allocated randomly into model group(GM, n = 9), IL-10 treatment group(GT, n = 9)and recovered group(GR, n = 9). At the end of the 12th week, all rats were sacrificed. RT-PCR and immunohistochemistry were performed to detect the expression of TGF-β1 in liver tissue. ELISA was used to assay serum TGF-β1 levels.
RESULTS: Hepatic fibrosis developed in rats with the increase of the injection frequency of CCl4. In the first stage, hepatic fibrosis developed and HSCs were isolated successfully. At the 7th and 11th week, TGF-β1 mRNA in GC group increased significantly compared with that in GN1(P = 0.001/0.042)and GI groups(P = 0.001/0.007), whereas there was no significant difference between the two groups. The levels of TGF-β1 at the beginning of the 7th wk was higher than that of the 11th wk(P = 0.049). Immunocytochemistry results of TGF-β1 were consistent with the above findings. In the second stage, TGF-β1 increased significantly in GM group compared to GN2. After treatment with IL-10, TGF-β1 declined obviously. The expression of TGF-β1 decreased in GR group but was still higher than that in GT group.
CONCLUSION: The levels of TGF-β1 are increased in hepatic fibrosis rats and decreased after treatment with exogenous IL-10. IL-10 may play an anti-fibrotic role by suppressing TGF-β1 expression.
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Affiliation(s)
- Mei-Na Shi
- Department of Gastroenterology, Union Hospital of Fujian Medical University, Fuzhou 350001, Fujian Province, China
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Abstract
AIM: To study the effects of interleukin-10 (IL-10) on the expression of α-smooth muscle actin (α-SMA), nuclear factor-κB(NF-κB) and Fas/Fas ligand (FasL) in hepatic stellate cells of experimental rats with hepatic fibrosis.
METHODS: Sixty clean SD rats were randomly divided into control group (group N), liver fibrotic group (group C) and IL-10 treatment group (group I). Control group received intraperitoneal injection of saline (2ml•kg-1), twice a week. Fibrotic group was injected intraperitoneally with 50% carbon tetrachloride (CCl4) (2 ml•kg-1), twice a week. IL-10 treatment group was given IL-10 at a dose of 4 µg•kg-1 20 minutes before CCl4 administration from the third week. Hepatic stellate cells (HSCs) were isolated from these rats at the seventh and eleventh weeks during the course of liver fibrosis, respectively. The expression of α-SMA and NF-κB in HSCs was measured by S-P immunohistochemistry. The expression of Fas and FasL mRNA was measured by RT-PCR. Furthermore, liver tissues were harvested from three groups at the same time.
RESULTS: The CCl4- induced experimental rat hepatic fibrosis model was established successfully. The purity of extracted hepatic stellate cells was about 95% and the yield of hepatic stellate cells was 1.2-2.3×106/g liver tissue averagely. The positive expression of α-SMA and NF-κB was 36.5% and 28.5% respectively in group N. The positive levels of α-SMA and NF-κB were increased significantly in group C compared to group N (P<0.01). The positive signals decreased significantly (P<0.05) in group I. In the 11th week, the HSCs of group I became round with visible pyknotic nuclei. The expression of NF-κB in group C was significantly increased in a time-dependentmanner (P<0.01), but there was no difference in the α-SMA expression (P >0.05). The mRNA of Fas and FasL in group C was significantly increased in a time-dependent manner compared to that in control group. After treated with IL-10, the expression level of Fas and FasL was higher in group I than in group C.
CONCLUSION: The positive expression of α-SMA and NF-κB in hepatic stellate cells is decreased by ectogenic IL-10 in liver fibrosis induced by CCl4. The expression of Fas and FasL is increased in the course of liver fibrosis, and is further increased by IL-10. IL-10 could inhibit the activation of HSCs and cause apoptosis of activated HSCs.
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Affiliation(s)
- Li-Juan Zhang
- Department of Gastroenterology, Union Hospital of Fujian Medical University, Fuzhou 350001, Fujian Province, China
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Abstract
AIM: To study the therapeutic effect of exogenous interleukin-10 on CCl4-induced hepatic fibrosis in rats and its possible mechanisms.
METHODS: Fourty-seven SD rats were randomly divided into control group (group N) and CCl4-induced hepatic fibrosis model group (group C). After CCl4 was given for 9 wk, the model group was divided into three groups. Rats in group M were put to death immediately, rats in group T were treated with IL-10 for another three wk and then put to death, rats in group R recovered after three weeks and were then killed. The degree of hepatic fibrosis was measured by HE staining and histological activity index (HAI). Histological activity index (HAI), change of collagen types I and III were measured by Picrosirius staining. The expression of TNF-α, MMP-2 and TIMP-1 in liver tissue was measured by S-P immunohistochemistry.
RESULTS: CCl4- induced experimental rat hepatic fibrosis model was established successfully. The degree of hepatic fibrosis was markedly lower in group T than in groups M and R, and there was no difference between the two groups. The expression of collagen types I and III was significantly suppressed in group T and was slightly suppressed in groups M and R. The positive levels of TNF-α, MMP-2 and TIMP-1 in group M increased significantly compared to those in group N (P < 0.01). The positive signals decreased significantly in groups T and R (P < 0.01), but positive score was significantly lower in group T than in group R (P < 0.01).
CONCLUSION: Exogenous IL-10 can reverse CCl4-induced hepatic fibrosis in rats. IL-10 may exert its reversible effects on hepatic fibrosis by blocking CCl4-induced inflammation, inhibiting expression of MMP-2 and TIMP-1 and promoting resolution of collagen types I and III.
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Affiliation(s)
- Yue-Hong Huang
- Department of Gastroenterology, Union Hospital of Fujian Medical University, Fuzhou 350001, Fujian Province, China
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Abstract
AIM: To study the effect of IL-10 on the expression of growth factors - transforming growth factor-β1 (TGF-β1), epidermal growth factor (EGF), hepatocyte growth factor (HGF)and platelet-derived growth factor (PDGF) of hepatic stellate cells (HSCs) of hepatic fibrosis rat and the anti-fibrogenic role of exogenous IL-10.
METHODS: Hepatic fibrosis was induced by CCl4 administration intra-peritoneally. Sixty clean male Sprague-Dawley (SD) rats were randomly divided into three groups: normal control group (GN, 8 rats), hepatic fibrosis model group (GC, 28 rats) and IL-10 treated group (GI, 24 rats). At the beginning of the 7th and 11th wk, rats in each group were routinely perfused with pronase E and type IV collag-enase through a portal vein catheter and the suspension obtained from the liver was spun by centrifugation with 11% Nycodenz density gradient to isolate HSCs. Histological examination was used to determine the degree of hepatic fibrosis. RT-PCR was employed to analyze mRNA expression from freshly isolated cells. Immunocytochemistry was performed to detect protein expression in primary cultured HSCs.
RESULTS: Rat hepatic fibrosis was developed with the increase of injection frequency of CCl4, and HSCs were successfully isolated. At the 7th and 11th wk, TGF-β1, EGF, and HGF mRNA in GC increased obviously compared with GN (P = 0.001/0.042, 0.001/0.001, 0.001/0.001) and GI (P = 0.001/0.007, 0.002/0.001, 0.001/0.001). For TGF-β1, no difference was observed between GI and GN. For EGF, mRNA level in GI increased compared with GN during the 7th wk (P = 0.005) and 11th wk (P = 0.049). For HGF, mRNA level in GI decreased compared with GN at the 7th wk (P = 0.001) and 11th wk (P = 0.021). Between these two time points, TGF-β1 expression at the 7th wk was higher than that of the 11th wk (P = 0.049), but for EGF, the former was lower than the latter (P = 0.022). As for PDGF mRNA, there was no significant difference between these groups, but difference seemed to exist in protein levels. Results by immunocytochemistry of TGF-β1 and EGF were paralleled with the above findings.
CONCLUSION: The expression of TGF-β1, EGF and HGF increased in HSC of hepatic fibrosis rat and decreased after treatment with IL-10. IL-10 plays an anti-fibrogenic role by suppressing growth factors expression.
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Affiliation(s)
- Mei-Na Shi
- Department of Gastroenterology, Union Hospital of Fujian Medical University, Fuzhou 350001, Fujian Province, China
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Zheng WD, Zhang LJ, Shi MN, Chen ZX, Chen YX, Huang YH, Wang XZ. Expression of matrix metalloproteinase-2 and tissue inhibitor of metalloproteinase-1 in hepatic stellate cells during rat hepatic fibrosis and its intervention by IL-10. World J Gastroenterol 2005; 11:1753-8. [PMID: 15793858 PMCID: PMC4305868 DOI: 10.3748/wjg.v11.i12.1753] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/26/2004] [Revised: 07/27/2004] [Accepted: 12/28/2004] [Indexed: 02/06/2023] Open
Abstract
AIM To investigate the expression of matrix metallopr-oteinase-2 and tissue inhibitor of metalloproteinase-1 in hepatic fibrosis and the antifibrogenic role of exogenous interleukin-10 (IL-10). METHODS Hepatic fibrosis was induced by CCl(4) administration and 60 male Sprague-Dawley rats were randomly divided into normal control group (group N, 8 rats), CCl(4)-induced group (group C, 28 rats) and IL-10-treated group (group I, 24 rats). At the beginning of the 7(th) and 11(th) wk, rats in each group were routinely perfused with pronase E and type IV collagenase through portal vein catheter and the suspension was centrifuged by 11% Nycodenz density gradient to isolate hepatic stellate cells (HSCs). RT-PCR was used to analyze mRNA of MMP-2 and TIMP-1 from freshly isolated cells. Densitometric data were standardized with beta-actin signals. Immunocytochemistry was performed to detect MMP-2 and TIMP-1 expression in HSC cultured for 72 h. RESULTS Compared to group N in the 7(th) wk, MMP-2 and TIMP-1 mRNA increased in group C (P = 0.001/0.001) and group I (P = 0.001/0.009). The level of MMP-2 and TIMP-1 mRNA in group I was significantly lower than that in group C (P = 0.001/0.001). In the 11(th) wk, MMP-2 mRNA in group I was still lower than that in group C (P = 0.005), but both dropped compared with that in the 7(th) week (P = 0.001/0.004). TIMP-1 mRNA in group I was still lower than that in group C (P = 0.001), and increased in group C (P = 0.001) while decreased in group I (P = 0.042) compared with that in the 7(th) wk. Same results were found by immunocytochemistry. CONCLUSION Expression of MMP-2 and TIMP-1 is increased in hepatic fibrosis. IL-10 exhibits an antifibrogenic effect by suppressing MMP-2 and TIMP-1 expression.
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Affiliation(s)
- Wei-Da Zheng
- Department of Gastroenterology, Union Hospital of Fujian Medical University, Fuzhou 350001, Fujian Province, China
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Abstract
DsbA showed chaperone-like activity similar to but weaker than that of protein disulfide isomerase in increasing reactivation and decreasing aggregation during the refolding of guanidine hydrochloride-denatured D-glyceraldehyde-3-phosphate dehydrogenase and rhodanese. The fact that both enzymes are devoid of disulfide bonds indicates the independence of the chaperone-like activity of DsbA from its thiol-protein oxidoreductase activity. The increased reactivation of D-glyceraldehyde-3-phosphate dehydrogenase by DsbA can be suppressed with increasing concentrations of a peptide of 21 amino acid residues, suggesting that the peptide binding ability of DsbA is responsible for its chaperone-like activity.
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Affiliation(s)
- W D Zheng
- Shanghai Research Center of Biotechnology, Academia Sinica, China
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