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Zhong L, Tian L, Ng CYJ, Leung C, Yang X, Liong C, Chen H, Wong R, Ng BF, Lin ZX, Feng YB, Bian ZX. Persistent clinical symptoms and their association with CM syndromes in post-COVID-19 rehabilitation patients in Hong Kong. Heliyon 2023; 9:e19410. [PMID: 37810093 PMCID: PMC10558494 DOI: 10.1016/j.heliyon.2023.e19410] [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] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2023] [Revised: 08/21/2023] [Accepted: 08/22/2023] [Indexed: 10/10/2023] Open
Abstract
Background Heterogeneous clinical conditions were observed in individuals who had recovered from COVID-19 and some symptoms were found to persist for an extended period post-COVID. Given the non-specific nature of the symptoms, Chinese medicine (CM) is advantageous in providing holistic medical assessment for individuals experiencing persisting problems. Chinese medicine is a type of treatment that involves prescribing regimens based on CM Syndromes diagnosed by CM practitioners. However, inadequate research on CM elements behind the practice has faced scrutiny. Methods This study analysed 1058 CM medical records from 150 post-COVID-19 individuals via a semi-text-mining approach. A logistic model with MCMCglmm was then utilised to analyse the associations between the indicated factors and identified conditions. Calculations were performed using R Studio and related libraries. Results With the semi-text-mining approach, three common CM Syndromes (Qi and Yin Deficiency, Lung and Spleen Deficiency, Qi Deficiency of both Spleen and Lung) and nine clinical conditions (fatigue, poor sleep, dry mouth, shortness of breath, cough, headache, tiredness, sweating, coughing phlegm) were identified in the CM clinical records. Analysis via MCMCglmm revealed that the occurrence of persisting clinical conditions was significantly associated with female gender, existing chronic conditions (hypertension, high cholesterol, and diabetes mellitus), and the three persisting CM Syndromes. The current study triangulated the findings from our previous observational study, further showing that patients with certain post-COVID CM Syndromes had significantly increased log-odds of having persisting clinical conditions. Furthermore, this study elucidated that the presence of chronic conditions in the patients would also significantly increase the log-odds of having persistent post-COVID clinical conditions. Conclusion This study provided insights on mining text-based CM clinical records to identify persistent post-COVID clinical conditions and the factors associated with their occurrence. Future studies could examine the integration of integrating exercise modules, such as health qigong Liuzijue, into multidisciplinary rehabilitation programmes.
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Affiliation(s)
- Linda Zhong
- School of Chinese Medicine, Hong Kong Baptist University, Hong Kong
- School of Biological Sciences, Nanyang Technological University, Singapore
| | - Liang Tian
- Department of Physics and Institute of Computational and Theoretical Studies, Hong Kong Baptist University, Hong Kong
| | - Chester Yan Jie Ng
- School of Biological Sciences, Nanyang Technological University, Singapore
| | - Choryin Leung
- School of Chinese Medicine, Hong Kong Baptist University, Hong Kong
| | - Xian Yang
- Alliance Manchester Business School, The University of Manchester, Singapore
| | - Ching Liong
- School of Chinese Medicine, The Chinese University of Hong Kong
| | - Haiyong Chen
- School of Chinese Medicine, LKS Faculty of Medicine, The University of Hong Kong
| | - Rowena Wong
- Chinese Medicine Department, Hospital Authority, Hong Kong
| | - Bacon Fl Ng
- Chinese Medicine Department, Hospital Authority, Hong Kong
| | - Z X Lin
- School of Chinese Medicine, The Chinese University of Hong Kong
| | - Y B Feng
- School of Chinese Medicine, LKS Faculty of Medicine, The University of Hong Kong
| | - Z X Bian
- School of Chinese Medicine, Hong Kong Baptist University, Hong Kong
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Feng YB, Fan DQ, Yu J, Bie YK. Association between XPG gene polymorphisms and development of gastric cancer risk in a Chinese population. Genet Mol Res 2016; 15:gmr7877. [PMID: 27323165 DOI: 10.4238/gmr.15027877] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
We conducted a case-control study to investigate the role of three common single nucleotide polymorphisms (SNPs) in the xeroderma pigmentosum complementation group G (XPG) gene (rs2094258, rs751402 and rs17655) in the development of gastric cancer in a Chinese population. Between January 2012 and December 2014, samples from a total of 177 patients with gastric cancer and 237 control subjects were collected from the Ankang City Central Hospital. XPG rs2094258, rs751402 and rs17655 polymorphisms were genotyped using polymerase chain reaction-restriction fragment length polymorphism. Using logistic regression analysis, we found that the CC genotype of rs17655 was associated with an elevated risk of gastric cancer, and the adjusted odds ratio (OR) and 95% confidence intervals (95%CI) were 1.91 and 1.07-3.41, respectively. Moreover, individuals carrying the GC + CC genotype of rs17655 had an increased susceptibility to gastric cancer (OR = 1.61, 95%CI = 1.03-2.54). However, we did not observe a significant association between XPG rs2094258 and rs751402 polymorphisms and development of gastric cancer. In conclusion, our study suggests that the rs17655 polymorphism in XPG is associated with an increased risk of gastric cancer. The results of our findings should be further validated by further large sample size studies.
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Affiliation(s)
- Y B Feng
- Department of General Surgery, Ankang City Central Hospital, Ankang, China
| | - D Q Fan
- Department of General Surgery, Nuclear Industry 215 Hospital of Shaanxi Province, Xianyang, China
| | - J Yu
- Department of General Surgery, Nuclear Industry 215 Hospital of Shaanxi Province, Xianyang, China
| | - Y K Bie
- Department of General Surgery, Ankang City Central Hospital, Ankang, China
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Cao YL, Chen CF, Wang AW, Feng YB, Cheng HX, Zhang WW, Xin W. Changes of peripheral-type benzodiazepine receptors in the penumbra area after cerebral ischemia-reperfusion injury and effects of astragaloside IV on rats. Genet Mol Res 2015; 14:277-85. [PMID: 25729960 DOI: 10.4238/2015.january.23.1] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
This study investigated the changes in peripheral benzodiazepine receptors (PBRs) in the penumbra after cerebral ischemia-reperfusion injury, and examined the effects of astragaloside IV (AST) on PBRs in rats. Sixty Sprague-Dawley rats were divided into a sham operation group, a model group, and three AST treatment groups. Cerebral ischemic models were induced by the clue-blocked method. Neurological deficits were examined. The animals were sacrificed after 2 h of ischemia and 24 h of reperfusion, and mitochondria from the penumbra were purified. PBR density (Bmax) and affinity were measured by radioligand assays. Mitochondrial [(3)H]PK11195 binding was correlated with neurological deficits in rats. Compared to the model group, the 10 mg/kg AST group, 40 mg/kg AST group, and 100 mg/kg AST group had fewer neurological deficits. The effects in the 40 mg/ kg group did not significantly differ from the effects in the 100 mg/ kg group. Compared to the model group, the 10 mg/kg AST group, 40 mg/kg group, and 100 mg/kg group had a decreased Bmax in the penumbra. The Bmax decreased in the 40 mg/kg AST group and in the 100 mg/kg AST group compared with the 10 mg/kg group. The Bmax and neurological deficits in the 40 mg/kg did not significantly differ from those in the 100 mg/kg group. By contrast, the AST-treated rats showed no significant changes in the binding parameter equilibrium dissociation constant compared with those in the sham operation group and the model group. AST protects ischemic brain tissue by inhibiting PBR expression after cerebral ischemia.
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Affiliation(s)
- Y L Cao
- Department of Neurology, Shandong Provincial Hospital Affiliated to Shandong University, Jinan, China
| | - C F Chen
- Department of Neurology, Shandong Provincial Hospital Affiliated to Shandong University, Jinan, China
| | - A W Wang
- Department of Pharmacy, Shandong Provincial Hospital Affiliated to Shandong University, Jinan, China
| | - Y B Feng
- Department of Neurology, Shandong Provincial Hospital Affiliated to Shandong University, Jinan, China
| | - H X Cheng
- Department of Pathology, Shandong Provincial Hospital Affiliated to Shandong University, Jinan, China
| | - W W Zhang
- Central Laboratory, Shandong Provincial Hospital Affiliated to Shandong University, Jinan, China
| | - W Xin
- Central Laboratory, Shandong Provincial Hospital Affiliated to Shandong University, Jinan, China
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Li J, Lang MJ, Mao XB, Tian L, Feng YB. Antiapoptosis and mitochondrial effect of pioglitazone preconditioning in the ischemic/reperfused heart of rat. Cardiovasc Drugs Ther 2008; 22:283-91. [PMID: 18470603 DOI: 10.1007/s10557-008-6115-x] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/15/2007] [Accepted: 02/15/2008] [Indexed: 12/13/2022]
Abstract
PURPOSE Pioglitazone, used clinically in the treatment of type 2 diabetes mellitus, has been implicated as a regulator of cellular inflammatory and ischemic responses. The present study examined whether pioglitazone could inhibit cardiomyocyte apoptosis and reduce mitochondrial ultrastructure injury and membrane potential loss in the ischemic/reperfused heart of the rat. Furthermore, we investigated whether the protective effect of pioglitazone was related to opening of the mitochondrialATP-sensitive potassium channels. METHODS Adult male Sprague-Dawley rats were subjected to 30 min of ischemia followed by 4 h of reperfusion. At 24 h before ischemia, rats were randomized to receive 0.9% saline, 5-hydroxydecanoate (5-HD, 10 mg kg(-1), i.v.) plus pioglitazone (3 mg kg(-1), i.v.) or pioglitazone (3 mg kg(-1), i.v.). One group served as sham control. We investigated mitochondrial structure, apoptosis rate and Bcl-2, Bax and Caspase-3 proteins by immunohistochemistry staining. RT-PCR was used to determine the expression of P38MAPKmRNA and JNKmRNA. Western blotting was used to measure the expression of P38MAPK, JNK and NFkappaB P65. A second group of rats were randomly divided into sham-operated, ischemia/reperfusion (I/R), pioglitazone treatment, 5-HD + pioglitazone and 5-HD groups and the size of myocardial infarction was determined. Primary cultured cardiomyocytes of neonatal Sprague-Dawley rats were divided into control, hypoxia reoxygenation, different concentrations of pioglitazone and 5-HD + pioglitazone groups. JC-1 staining flowcytometry was used to examine mitochondrial membrane potential (DeltaPsim). RESULTS Pioglitazone decreased mitochondrial ultrastructural damage compared to I/R, and reduced infarct size from 34.93 +/- 5.55% (I/R) to 20.24 +/- 3.93% (P < 0.05). Compared with the I/R group, the apoptosis rate and positive cell index (PCI) of Bax and Caspase-3 proteins in the pioglitazone group were significantly decreased (P < 0.05), while the PCI of Bcl-2 protein was increased (P < 0.05). There was no significant difference between the I/R and 5-HD + pioglitazone groups. Compared with the sham-operated group, the expression of P38MAPK mRNA, JNK mRNA and protein of P38MAPK, JNK and NFkappaB P65 in I/R was increased (P < 0.05). Pioglitazone did inhibit the increase in expressions vs I/R (P < 0.05). The rate of loss DeltaPsim cells in the pioglitazone group was significantly lower than in the hypoxia reoxygenation group, while the addition of 5-HD inhibited the effect of pioglitazone. CONCLUSION Pioglitazone inhibited cardiomyocyte apoptosis and reduced mitochondrial ultrastructure injury and membrane potential loss in the ischemic/reperfused heart of rat. These protective effects of pioglitazone may be related to opening mitochondrial(ATP)-sensitive potassium channels.
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Affiliation(s)
- Jian Li
- Department of Cardiology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, No.1277 Jiefang Road, Wuhan 430022, China.
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Li M, Chen J, Li YS, Feng YB, Zeng QT. Folic acid reduces chemokine MCP-1 release and expression in rats with hyperhomocystinemia. Cardiovasc Pathol 2007; 16:305-9. [PMID: 17868882 DOI: 10.1016/j.carpath.2007.03.005] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [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: 10/31/2006] [Revised: 02/28/2007] [Accepted: 03/13/2007] [Indexed: 11/18/2022] Open
Abstract
OBJECTIVE This study aimed to investigate the effects of folate on the monocyte chemoattractant protein-1 (MCP-1) expression and release in rats with hyperhomocystinemia induced by ingestion of excess methionine. METHODS AND RESULTS Thirty male Sprague-Dawley rats (200+/-20 g) were randomly divided into three groups (n=10 for each group): control group (Control), high-homocystinemia (Hhcy) group, and folate treatment (FA) group. They were fed with a normal regular diet, enriched by 1.7% methionine plus 1.7% methionine and 0.006% folate for 45 days. Our study showed the following: (a) A high methionine diet for 45 days is sufficient to induce hyperhomocystinemia; folate supplementation to the rats fed the high-methionine diet prevented an elevation homocysteine (Hcy) levels in the blood (P<.01). (b) Compared with the Control group, the Hhcy group had elevated plasma levels of MCP-1, and Hcy was significantly correlated with MCP-1 (P<.05). (c) The protein and mRNA expression of MCP-1 in the aorta was higher in rats from the Hhcy group than in rats from the Control group. (d) Most important, after folic acid supplementation, the lowering of Hcy levels was accompanied by a marked reduction of MCP-1 expressed in aortae and released from plasma and peripheral blood mononuclear cells (PBMCs) stimulated by oxidized low-density lipoprotein (P<.05, P<.01). CONCLUSION Folic acid supplementation not only can blunt the rise in Hcy and reduce MCP-1 released from both plasma and PBMCs of rats with hyperhomocystinemia but also can downgrade MCP-1 expression in the aorta of rats with hyperhomocystinemia.
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Affiliation(s)
- Ming Li
- Institute of Cardiovasology, Union Hospital, Tongii Medical College, Huazhong Science and Technology University, Hubei, China.
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Li M, Chen J, Li YS, Feng YB, Gu X, Shi CZ. Folic acid reduces adhesion molecules VCAM-1 expession in aortic of rats with hyperhomocysteinemia. Int J Cardiol 2006; 106:285-8. [PMID: 16183151 DOI: 10.1016/j.ijcard.2005.07.006] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/26/2005] [Accepted: 07/30/2005] [Indexed: 11/25/2022]
Abstract
To investigate effects of supplementation of folic acid on the expression of adhesion molecules VCAM-1 in the aortas of rats with hyperhomocysteinemia. Thirty male SD rats (200 +/- 20 g) were invided into 3 groups (n = 10 for each group): control group(Control), high Met group(Met) and Met plus Folate group(Met + Folate), fed. for 45 days. Plasma Hcy levels were higher with the high-methionine diet (140.68 +/- 36.87 micromol/L vs 6.47 +/- 1.10 micromol/L in control rats) an effect which was reduced by folate. Respectively, the aortic expression of adhesion molecules VCAM-1 at protein and mRNA levels were higher in the Met groups than those in the control groups or the Met + Folate groups. A high methionine diet for 45 days was sufficient to induce hyperhomocysteinemia. Folate supplementation prevented elevation of Hcy levels in the blood, and reduced expression of the adhesion molecule VCAM-1. Hyperhomocysteinemia is now regarded as one of the important risk factors for cardiovascular and cerebralvascular disorders.[Welch GN, Loscalzo J. Homocysteine and atherothrombosis. N Engl J Med 1998; 38(15):1042-50.] Several plausible mechanisms for Hcy-induecd atherosclerosis have been proposed. These include endothelial dysfunction, enhancement of oxidative stress, reduction in NO bioavailability, and augmentation of thrombus formation.[Holven KB, Holm T, Aukrust P, et al. Effect of folic acid treatment on endothelium-dependent vasodilation and nitric oxide-derived end products in hyperhomocysteinemic subjects . Am J Med 2001;110(7):536-42; Guba SC, Fonseca V, Fink LM. Hyperhomocysteinemia and thrombosis. Semin Thromb Hemost 1999;25(3):291-309.] However, the precise molecular mechanism is still unclear. Recent reports have suggested a role for inflammatory processes in the pathogenesis of atherosclerosis.[Gerard C, Rollins BJ. Chemokines and disease. Nat Immunol 2001;2(2):108-15.] Dysfunction of endothelial cells is the key process promoting inflammatory reactions. On injury, endothlial cells are capable of producing various cytokines that participate in inflammatory reactions in the arterial wall. Although results from in vitro studies suggest that Hcy, at pathophysiological concentrations, stimulates chemokine expression in vascular cells, it is unknown whether hyperhomocysteinemia can initiate similar changes, leading to enhanced momocyte adhesion/binding to the vascular endothelium in vivo.[Zeng X, Dai J, Remick DG, Wang X. Homocysteine mediated expression and secretion of monocyte chemoattractant protein-1 and interleukin-8 in human monocytes. Circ Res 2003;93(4):311-20.] On the basis of the potential pathogenic role of chemokines in atherogenesis, the objective of the present study was to investigate that homocsteine may exert its effect in part though adhesion molecules VCAM-1 and that folic acid supplementation may downregulate these inflammatory responses. Male Sprague-Dawley rats (bred from animal centers of Tongji Medical College, Huazhong Science and Technology University) aged 8 weeks were divided into 3 groups(n=10 for each group) and maintained for 45 days on the following diets before the experiments: (1) regular diet; (2) high-metheionine diet, consisting of regular diet plus 1.7% methionine; and (3) high-methionine plus folate -rich diet, consisting of regular diet plus 1.7% methionine and 0.006% folate.[Boisvert WA, Curtiss LK, Terkeltaub RA. Interleukin-8 and its receptor CXCR2 in atherosclerosis. Immunol Res 2000;21(2-3):129-d37.] Plasma and serum samples wee colleced and stored at -80 degrees C after 45 days until analysis. The plasma homocysteine concentration of rats in three groups were determined by high-pressue liquid chromatography. To detect the endothelial expression of adhesion molecules VCAM-1, the thoracic aorta was isolated and dived into segments. These segments were immersion-fixed in 10% neutral-buffered formalin overlight and then embedded in paraffin. Sequential 5 mum paraffin-embedded cross sections were prepared. Immunohistochemical analyisis was performed to detect vascular cell adhesion molecule(VCAM)-1, The fixed cryosections were immediately blcked in 10% horse serum and phosphate baffered saline(PBS) at room temperature for 30 min. Goat polyclonal andibodies against rat VCAM-1(Santa Cruz Biotechnology) were diluted 1:100 in PBS and incubated with the cryosections for 1 h of room temperature. After three washes, the sections were incubated with biotin-conjugated rabbit anti-goat immunoglobulins(Dako) at 1:250 dilution in PBS. After three washes, the samples were mounted in 90% glycerol-PBS. Photographs were taken by use of a light microscope at a mignification of x200.
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Wang XX, Zhou LL, Ding JW, Feng YB, Cheng LX. [Adenosine protects cardiomyocytes from hypoxia/reoxygenation injury]. Sheng Li Xue Bao 2003; 55:47-52. [PMID: 12598934] [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: 03/01/2023]
Abstract
The aim of this study was to investigate the protective effect of adenosine (ADO) on cardiomyocytes following hypoxia/reoxygenation (H/R) and its molecular mechanism. Primary cultured cardiomyocytes of neonatal rats were divided into two groups, namely H/R (control) and ADO (1.0 micromol/L) groups. The morphologic changes in cardiomyocytes were observed under an inverted phase-contrast microscope. The following parameters of the two groups were determined: lactate dehydrogenase (LDH) activity, intracellular calcium concentration and malondialdehyde (MDA) content. Tumor necrotic factor (TNF-alpha) assay was performed using an ELISA kit and NF-kappaB in the nucleus was analyzed by electrophoretic mobility shift assay (EMSA). The results are as follows: (1) after H/R injury, cardiomyocytes contracted, tending to get round in shape and its pseudopods decreased, while marked morphological changes were not observed in ADO group; (2) LDH leakage maintained at a lower level in ADO group than that in the control group during H/R (both P<0.01); (3) ADO significantly reduced the concentration of calcium in cells and prevented calcium overload during H/R (both P<0.01); (4) ADO markedly reduced the content of MDA during H/R (both P<0.01); (5) ADO inhibited the production of TNF-alpha during H/R (both P<0.01); and (6) ADO down-regulated NF-kappaB binding activity of cardiomyocytes during H/R (both P<0.01) The results suggest that (1) exogenous ADO attenuates H/R injury of cultured cardiomyocytes; (2) exogenous ADO inhibits the production of TNF-alpha after H/R injury; (3) exogenous ADO prevents the activation of NF-kappaB, which may be the molecular mechanism of down-regulation of TNF-alpha expression.
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Affiliation(s)
- Xing-Xiang Wang
- Department of Cardiology, Union Hospital Affiliated to Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430022.
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Wang XX, Feng YB. [Recent advances in cardiac beta 2-adrenergic receptor]. Sheng Li Ke Xue Jin Zhan 2001; 32:262-4. [PMID: 12545805] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 04/19/2023]
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Huang K, Dai GZ, Li XH, Fan Q, Cheng L, Feng YB, Xia GJ, Yao WX. Blocking L-calcium current by l-tetrahydropalmatine in single ventricular myocyte of guinea pigs. Zhongguo Yao Li Xue Bao 1999; 20:907-11. [PMID: 11270990] [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: 02/19/2023]
Abstract
AIM To study the effect of l-tetrahydropalmatine (l-THP) on L-type calcium channel. METHODS Patch clamp technique (whole cell recording) was used to record L-Ca2+ current in single cardiac myocyte. RESULTS 1) l-THP 1, 10, and 100 micromol.L-1 reduced ICa-max from (999 +/- 93) pA to (700 +/- 111) pA, (582 +/- 66) pA, and (420 +/- 112) pA (n = 6, P < 0.01), respectively. 2) l-THP reduced the voltage at half-maximal inactivation (V1/2) of L-Ca2+ channel to more negative potentials by 9 mV (n = 5, P < 0.05). 3) l-THP caused both tonic and use-dependent reduction of Ca2+ current. Tonic block of l-THP on Ca2+ current was 46% +/- 8% (n = 6, P < 0.01). The degree of use dependent blocking was 13.5% +/- 2.4% (n = 6, P < 0.05) at 1 Hz, the degree increased to 44% +/- 5% (n = 6, P < 0.01) at 3 Hz. 4) l-THP delayed half-recovery time of Ca2+ channel recovery from inactivity from (94 +/- 39) ms to (170 +/- 42) ms(n = 6, P < 0.01). CONCLUSION l-THP has a moderate inhibitory effect on L-Ca2+ current.
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Affiliation(s)
- K Huang
- Department of Cardiology, Cardiovascular Disease Institute, Union Hospital.
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Feng YB. [Noradrenaline release induced by electrical field stimulation during ischemia and reperfusion in rat hearts]. Zhonghua Yi Xue Za Zhi 1993; 73:622-4, 639. [PMID: 8313188] [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: 01/29/2023]
Abstract
The effects of the electrical field stimulation (6 Hz 5 v 2ms) on noradrenaline (NA) release during cardiac ischemia and reperfusion were studied in isolated perfused rat hearts. Endogenous NA was measured by high pressure liquid chromatography. Reproducible release during two subsequent stimulations (S1, S2) in all preparations showed that electrical field stimulation is a sufficient method for inducing exocytotic NA release. Ischemic periods of 10 min reduced markedly NA overflow from rat hearts (S2/S1 = 0.34, P < 0.01), while during the subsequent reperfusion period this suppression was abolished. These results indicate that excessive accumulation of NA is prevented by the endogenous inhibitor during early ischemia, a protective mechanism in early myocardial ischemia.
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Affiliation(s)
- Y B Feng
- Institute of Cardiovascular Diseases, Tongji Medical University, Wuhan
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Liang GF, Mao HY, Guo QG, Zhou BC, Feng YB, Qian SL. Subacute toxicity of rhomotoxin in rabbits. Acta Acad Med Wuhan 1985; 5:244-6. [PMID: 3843128 DOI: 10.1007/bf02860944] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
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Wang XF, Wang JE, Cao LS, Feng YB, Cao ZS, Huang YZ, Cai CD, Wu Y, Chen HR, Lu CF. Left-sided heart contrast echocardiography by pulmonary wedge injection of hydrogen peroxide. Chin Med J (Engl) 1985; 98:121-6. [PMID: 3922689] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023] Open
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Yu SL, Cao LS, Feng YB, Guo QG, Zhou BC, Guo HP, Liu YY. Effect of tetrandrine on acute experimental myocardial infarction. Acta Acad Med Wuhan 1982; 2:144-8. [PMID: 7167262 DOI: 10.1007/bf02858447] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
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Mao HY, Li CY, Cui JJ, Feng YB, Hu WS, Guo QG, Jiang MX. Rhomotoxin pharmacologic action in lowering blood pressure and slowing heart rate. Chin Med J (Engl) 1982; 95:311-8. [PMID: 6814841] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023] Open
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Mao HY, Tu YS, Nei FD, Liang GF, Feng YB. Rapid antihypertensive effect of rhomotoxin in 105 hypertension cases. Chin Med J (Engl) 1981; 94:733-6. [PMID: 6800715] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023] Open
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