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Zhou WK, Qu Y, Liu YM, Gao MJ, Tang CY, Huang L, Du Q, Yin J. The abnormal phosphorylation of the Rac1, Lim-kinase 1, and Cofilin proteins in the pathogenesis of Hirschsprung's disease. Bioengineered 2022; 13:8548-8557. [PMID: 35322726 PMCID: PMC9161833 DOI: 10.1080/21655979.2022.2051882] [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] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
Abstract
Rac1 can affect the migration of neural crest cells by regulating the polymerization of actin and the membrane formation process. But the role of the Rac1 signaling pathway in the pathogenesis of Hirschsprung’s disease (HSCR) remains unclear. In order to investigate the mechanism of the abnormal protein phosphorylation of Rac1, Lim-kinase 1 (Limk1) and Cofilin involved in the pathogenesis of HSCR. The protein phosphorylation levels of these proteins were detected by Western blot in 30 samples of HSCR narrow segment, 30 samples of transitional segment tissues, and 14 samples of normal intestinal tissues. Subsequently, in the SH-SY5Y human neuroblastoma cell line, a Rac1, Limk1, and Cofilin inhibitor group, a Rac1 overexpression group (PDGF-BB group), a Rac1 overexpression group + a Limk1 inhibitor group (P-B group), a Rac1 overexpression group + a Cofilin inhibitor group (P-C group) were established. The results showed that the expressions of p-Rac1, p-Limk1, and p-Cofilin in HSCR narrow segment and transitional segment were lower than those in normal intestine (p < 0.05). The expression levels of p-Rac1, p-Limk1, and p-Cofilin in the relative inhibitor group were significantly lower than those in the control group (p < 0.05), and the proliferation and migration levels in the control group and Rac1 overexpression group were significantly higher than those in the Rac1, Limk1, and Cofilin inhibitor group (p < 0.05). In conclusion, the decreased phosphorylation of the Rac1/Limk1/Cofilin signaling pathway in HSCR could inhibit the proliferation and migration of SH-SY5Y cells, and this might be associated with the pathogenesis of HSCR.
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Affiliation(s)
- Wan-Kang Zhou
- Department of Pediatric General, Thoracic & Urological Surgery II Ward, Affiliated Hospital of Zunyi Medical University, Zunyi, China
| | - Yan Qu
- Gastrointestinal Surgery, The Second Affiliated Hospital of Zunyi Medical University, Zunyi, China
| | - Yuan-Mei Liu
- Department of Pediatric General, Thoracic & Urological Surgery II Ward, Affiliated Hospital of Zunyi Medical University, Zunyi, China
| | - Ming-Juan Gao
- Department of Pediatric General, Thoracic & Urological Surgery II Ward, Affiliated Hospital of Zunyi Medical University, Zunyi, China
| | - Cheng-Yan Tang
- Department of Pediatric General, Thoracic & Urological Surgery II Ward, Affiliated Hospital of Zunyi Medical University, Zunyi, China
| | - Lu Huang
- Department of Pediatric General, Thoracic & Urological Surgery II Ward, Affiliated Hospital of Zunyi Medical University, Zunyi, China
| | - Qing Du
- Department of Pediatric General, Thoracic & Urological Surgery II Ward, Affiliated Hospital of Zunyi Medical University, Zunyi, China
| | - Jia Yin
- Department of Pediatric General, Thoracic & Urological Surgery II Ward, Affiliated Hospital of Zunyi Medical University, Zunyi, China
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Chen YT, Gao MJ, Zheng ZB, Huang L, Du Q, Zhu DW, Liu YM, Jin Z. Comparative analysis of cystic biliary atresia and choledochal cysts. Front Pediatr 2022; 10:947876. [PMID: 36090570 PMCID: PMC9448952 DOI: 10.3389/fped.2022.947876] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/14/2022] [Accepted: 07/27/2022] [Indexed: 12/22/2022] Open
Abstract
OBJECTIVE Cystic biliary atresia (CBA) is a rare and peculiar type of biliary atresia (BA) that is easily confused with infantile choledochal cysts (CCs). This study explored information for early CBA diagnosis and treatment. METHOD The authors retrospectively analyzed the clinical data of 32 children with hilar cysts from January 2013 to May 2021. According to the diagnosis, they were divided into the CBA (n = 12) and CC (n = 20) groups. Patient features, biochemical indexes, preoperative ultrasound characteristics, cholangiography features, and intraoperative findings were analyzed and compared between the two groups. RESULTS The alanine aminotransferase, aspartate aminotransferase, total bilirubin, and direct bilirubin levels in the CBA group were higher than in the CCs group (P < 0.05). Additionally, B-mode ultrasound showed a cystic mass in front of the hepatic hilum, and the cyst size was much smaller in the CBA group compared with the CC group (2.2 ± 1.3 cm vs. 6.0 ± 2.2 cm, P < 0.001). Among all of the parameters, cyst width was the most accurate for identifying CBA and CCs. A cutoff value of 2.5 cm (area under the curve, 0.98, P < 0.001) showed 90.9% sensitivity and 95% specificity for cyst size. CONCLUSION For children with early-onset severe jaundice, and if the width of the cystic mass was ≤2.5 cm, a diagnosis of CBA was highly likely. Early cholangiography and surgical treatment are necessary for the effective treatment of these infants.
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Affiliation(s)
- Yu-Tong Chen
- Department of Pediatric Surgery, Affiliated Hospital of Zunyi Medical University, Zunyi, China.,Department of Pediatric Surgery, Guizhou Children's Hospital, Zunyi, China
| | - Ming-Juan Gao
- Department of Pediatric Surgery, Affiliated Hospital of Zunyi Medical University, Zunyi, China.,Department of Pediatric Surgery, Guizhou Children's Hospital, Zunyi, China
| | - Ze-Bing Zheng
- Department of Pediatric Surgery, Affiliated Hospital of Zunyi Medical University, Zunyi, China.,Department of Pediatric Surgery, Guizhou Children's Hospital, Zunyi, China
| | - Lu Huang
- Department of Pediatric Surgery, Affiliated Hospital of Zunyi Medical University, Zunyi, China.,Department of Pediatric Surgery, Guizhou Children's Hospital, Zunyi, China
| | - Qing Du
- Department of Pediatric Surgery, Affiliated Hospital of Zunyi Medical University, Zunyi, China.,Department of Pediatric Surgery, Guizhou Children's Hospital, Zunyi, China
| | - Dai-Wei Zhu
- Department of Pediatric Surgery, Affiliated Hospital of Zunyi Medical University, Zunyi, China.,Department of Pediatric Surgery, Guizhou Children's Hospital, Zunyi, China
| | - Yuan-Mei Liu
- Department of Pediatric Surgery, Affiliated Hospital of Zunyi Medical University, Zunyi, China.,Department of Pediatric Surgery, Guizhou Children's Hospital, Zunyi, China
| | - Zhu Jin
- Department of Pediatric Surgery, Affiliated Hospital of Zunyi Medical University, Zunyi, China.,Department of Pediatric Surgery, Guizhou Children's Hospital, Zunyi, China
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Hu S, Dai YL, Gao MJ, Wang XN, Wang HB, Dou YQ, Bai XD, Zhou FQ. Pyruvate as a novel carrier of hydroxyethyl starch 130/0.4 may protect kidney in rats subjected to severe burns. J Surg Res 2018; 225:166-174. [PMID: 29605028 DOI: 10.1016/j.jss.2018.01.003] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2017] [Revised: 10/09/2017] [Accepted: 01/03/2018] [Indexed: 02/07/2023]
Abstract
BACKGROUND The carrier of hydroxyethyl starch (HES) may play a critical role in kidney injury in fluid resuscitation. This study aimed mainly to compare effects of pyruvate-enriched saline with normal saline (NS) and acetate Ringer's (AR) solution as a carrier in HES130/0.4 on kidney function in rats subjected to severe burns. METHODS Using a lethal burn model, 140 rats were randomly allocated in seven groups (n = 20): sham group (group S); no fluid after burn (group N); burn resuscitated with NS (group NS); burn resuscitated with pyruvate saline (group PS); burn resuscitated with AR plus pyruvate-HES (group SP); burn resuscitated with AR plus acetate-HES (group SA), and burn resuscitated with AR plus NS-HES (group SN). A low volume (18.75 mL·kg-1 during 12 h) of HES130/0.4 was infused with the ratio of 1:1 to crystalloids. Renal surface blood flow, blood creatinine and blood urea nitrogen, early sensitive indicators of kidney function: alpha-1 microglobulin, cystatin-C, and neutrophil gelatinase-associated lipocalin in blood and urine, and kidney tissue water contents were determined. Renal histopathological alterations with Paller scores were also measured at 8 h and 24 h after burn (n = 10), respectively. RESULTS The results showed in a comparable manner that group SP was the best in three HES groups and group PS was superior to group NS in renal preservation; group SP appeared significantly beneficial compared with group PS in renal surface blood flow, cystatin-C, neutrophil gelatinase-associated lipocalin, water contents, and Paller scores at 8-h or both time points after burn, respectively (all P < 0.05). CONCLUSIONS The carrier of HES130/0.4 played a crucial role in kidney injury in fluid resuscitation of rats subjected to severe burns. Pyruvate-enriched HES130/0.4 was superior and HES130/0.4, per se, might be not renocytotoxic, but renoprotective. Further studies are warranted.
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Affiliation(s)
- Sen Hu
- Laboratory for Shock and Multiple Organ Dysfunction of Burns Institute, Key Research Laboratory of Tissue Repair and Regeneration of PLA, and Beijing Key Research Laboratory of Skin Injury and Repair Regeneration, First Hospital Affiliated to the Chinese PLA General Hospital, Beijing, China
| | - Yue-Long Dai
- Chinese People's Armed Police Forces Academy, Langfang, Hebei, China
| | - Ming-Juan Gao
- Department of Burn and Plastic Surgery, The General Hospital of Chinese People's Armed Police Forces, Beijing, China
| | - Xiao-Na Wang
- Department of Burn and Plastic Surgery, The General Hospital of Chinese People's Armed Police Forces, Beijing, China
| | - Hai-Bin Wang
- Clinical Laboratory, First Hospital Affiliated to the Chinese PLA General Hospital, Beijing, China
| | - Yong-Qi Dou
- Department of TCM, Chinese PLA General Hospital, Beijing, China
| | - Xiao-Dong Bai
- Department of Burn and Plastic Surgery, The General Hospital of Chinese People's Armed Police Forces, Beijing, China.
| | - Fang-Qiang Zhou
- Shanghai Sandai Pharmaceutical R&D Co., Ltd., Pudong, Shanghai, China; Newton, Massachusetts.
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Lei T, Bi Y, Gao MJ, Gao SM, Zhou LL, Zheng HL, Chen XD. HES1 inhibits adipogenesis of porcine mesenchymal stem cells via transcriptional repression of FAD24. Domest Anim Endocrinol 2013; 45:28-32. [PMID: 23611667 DOI: 10.1016/j.domaniend.2013.03.003] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/19/2013] [Revised: 03/16/2013] [Accepted: 03/18/2013] [Indexed: 11/15/2022]
Abstract
Adipogenesis, the development from preadipocytes or mesenchymal stem cells (MSCs) to mature adipocytes, is regulated by a network of signaling pathways and transcription factors. The involvement of Notch signaling and its effector HES1 in adipogenesis has been investigated in several studies with conflicting results. The underlying mechanisms remain unclear because of the lack of information about HES1 target genes during adipocyte differentiation. As a novel gene transiently up-regulated in early adipogenesis, FAD24 functions as a positive regulator of adipocyte differentiation in both preadipocytes and MSCs. In the present study, we report that the expression level of FAD24 is inversely associated with that of HES1 in porcine MSCs after adipogenic induction. Enforced overexpression of HES1 in MSCs during the early stage of adipogenesis significantly repressed the transcription of FAD24 (P < 0.01) and the other pro-adipogenic genes (P < 0.05), resulting in reduced intracellular lipid accumulation. Sequence analysis showed that porcine FAD24 harbors an evolutionarily conserved HES1 binding site in its proximal promoter region. Functional HES1, but not its dominant-negative mutant, markedly reduced the promoter activity of FAD24 (P < 0.01). Site-directed mutation and chromatin immunoprecipitation further confirmed that HES1 inhibits FAD24 transcription by direct binding to the promoter. Taken together, we identified FAD24 as a novel downstream target of HES1 during adipogenesis. Our data suggest that HES1-mediated repression of FAD24 transcription at the early stage of adipocyte differentiation may contribute to the impaired adipogenesis induced by the Notch-HES1 signaling pathway.
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Affiliation(s)
- T Lei
- Key Laboratory of Agricultural Animal Genetics, Breeding and Reproduction of Ministry of Education, College of Life Science and Technology, Huazhong Agricultural University, Wuhan 430070, China.
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Jin S, Wen MF, Liu LF, Gao MJ, Wu JZ. Synthesis and supramolecular networks of 5,6-dioxo-1,10-phenanthroline-2,9-dicarboxylic acid dihydrate and its first coordination compound cis-diaquachlorido(5,6-dioxo-1,10-phenanthroline-2,9-dicarboxylic acid-κ4O2,N,N',O9)manganese(II) chloride dihydrate. Acta Crystallogr C 2012; 68:m135-8. [PMID: 22552306 DOI: 10.1107/s0108270112017763] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2012] [Accepted: 04/20/2012] [Indexed: 11/10/2022] Open
Abstract
5,6-Dioxo-1,10-phenanthroline-2,9-dicarboxylic acid dihydrate (H(2)pdda·2H(2)O), C(14)H(6)N(2)O(6)·2H(2)O, was obtained by carbonylation of 1,10-phenanthroline-2,9-dicarboxylic acid. Its first coordination compound, [MnCl(C(14)H(6)N(2)O(6))(H(2)O)(2)]Cl·2H(2)O, in which the H(2)pdda ligand remains protonated, was synthesized in aqueous acetic acid. H(2)pdda chelates one water molecule via hydrogen bonds in H(2)pdda·2H(2)O, whereas in the coordination compound it chelates one heptacoordinate Mn(II) atom via coordination bonds. The N atoms in H(2)pdda·2H(2)O and the Cl atoms in the coordination compound are also involved in hydrogen bonds. Extensive hydrogen bonding results in supramolecular networks in both compounds.
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Affiliation(s)
- Shuang Jin
- School of Chemistry and Environment, South China Normal University, Guangzhou 510006, People's Republic of China
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Gao MJ, Yang P, Cai B, Dai JW, Wu JZ, Yu Y. Spontaneous resolution of lanthanide coordination polymers with 2-hydroxypyrimidine-4,6-dicarboxylic acid. CrystEngComm 2012. [DOI: 10.1039/c1ce06090b] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Murphy TM, Gao MJ. Multiple forms of formamidopyrimidine-DNA glycosylase produced by alternative splicing in Arabidopsis thaliana. J Photochem Photobiol B 2001; 61:87-93. [PMID: 11535407 DOI: 10.1016/s1011-1344(01)00172-5] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Formamidopyrimidine-DNA glycosylase (FPG) catalyzes the initial steps in the repair of DNA containing oxidized purines. Two cDNA clones from Arabidopsis thaliana encoding homologs of bacterial FPG have previously been described. We now report that there are at least five additional variants of FPG mRNA in Arabidopsis, each apparently produced from the same gene (AtMMH) by alternative splicing. Thus, AtMMH, like at least four other genes in the base excision repair pathway of human cells, produces multiple forms of protein product through alternative splicing. The variant forms of Arabidopsis FPG may be localized in different locations in the cells, may have different preferences for oxidized substrates, and/or may recruit different proteins that guide the subsequent steps of base excision repair.
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Affiliation(s)
- T M Murphy
- Section of Plant Biology, University of California, One Shields Ave., Davis, CA 95616, USA.
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Abstract
Formamidopyrimidine-DNA glycosylase (FPG) catalyzes the initial steps in the repair of DNA containing oxidized purines. Two complementary DNA clones encoding homologs of bacterial FPG, designated Atfpg-1 and Atfpg-2, have been isolated from Arabidopsis thaliana. They are products of alternative splicing of the transcript of a single gene. Proteins encoded by both clones, AtFPG-1 and AtFPG-2, engineered to contain oligohistidine sequences on their C-terminal ends, were expressed in Escherichia coli and purified, and their activities were assayed. Both proteins cleaved DNA that contained apurinic sites, indicating that they have abasic lyase activity. AtFPG-1, but not AtFPG-2, showed significant cleavage of a double-stranded oligonucleotide that contained 8-oxo-guanine, indicating that the structural differences between the two proteins influence their enzymatic activities. However, both proteins were able to cleave the same sites in DNA that was treated with visible light in the presence of methylene blue.
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Affiliation(s)
- M J Gao
- Section of Plant Biology, University of California, One Shields Avenue, Davis, CA 95616, USA
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Gao MJ. Sex health education in university. China Popul Today 1997; 14:17-8. [PMID: 12347916] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Key Words] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/26/2023]
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Zamecnik PC, Kim B, Gao MJ, Taylor G, Blackburn GM. Analogues of diadenosine 5',5'''-P1,P4-tetraphosphate (Ap4A) as potential anti-platelet-aggregation agents. Proc Natl Acad Sci U S A 1992; 89:2370-3. [PMID: 1549600 PMCID: PMC48659 DOI: 10.1073/pnas.89.6.2370] [Citation(s) in RCA: 52] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022] Open
Abstract
Dense granules of platelets contain a high content of diadenosine 5',5'''-P1,P4-tetraphosphate (Ap4A). We have previously demonstrated an antithrombotic effect of this compound in a live rabbit model. In the present study we find that certain synthetic Ap4A analogues are superior to Ap4A in inhibiting ADP-induced aggregation of human platelets. Analogues having a P--C--P bridge located in the P2,P3 position of Ap4A are the most potent inhibitors. These analogues are also resistant to hydrolytic enzymes. Analogues having the above characteristics exhibit competitive inhibition with ADP in the ADP-induced platelet aggregation reaction. These compounds, such as AppCHFppA, may be useful as antithrombotic agents. The analogues ApSppSpA and ApSpCHFpSpA also showed good inhibitory effects on ADP-induced platelet aggregation. In addition, this action of Ap4A and its analogues provides an example of a dinucleotide inducing an antagonistic effect by occupying an extracellular mononucleotide binding site on platelets. It calls attention to the possibility that Ap4A and its analogues may act in a similar way in whole organisms, triggering effector or inhibitory responses in any one of a variety of cells.
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Affiliation(s)
- P C Zamecnik
- Worcester Foundation for Experimental Biology, Shrewsbury, MA 01545
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Paldus J, Gao MJ, Chen JQ. Clifford algebra unitary-group approach to many-electron system partitioning. Phys Rev A Gen Phys 1987; 35:3197-3217. [PMID: 9898535 DOI: 10.1103/physreva.35.3197] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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