Abstract:
BACKGROUND:The activation of extracellular signal-regulated kinase1/2 (ERK1/2) has been shown to be important signaling pathway in the ischemic preconditioning (IPC) response. Recently, some studies suggest a key role for the mitochondrial ATP-sensitive potassium channel (mKATP) as both a trigger and an end effector of acute and delayed protection of IPC. Hence, this study was undertaken to elucidate the relationship between mKATP and ERK1/2 in the delayed protection mechanism of anoxic preconditioning (APC). METHODS:An APC model was established using cultured neonatal rat cardiomyocytes. Pharmacological agents [diazoxide, 5-hydroxydecanoate (5-HD), 2-mercaptopropionylglycine (MPG), and PD98059] were used to modulate mKATP and ERK1/2 activation. Cellular injury was evaluated by measuring cellular superoxide dismutase (SOD) activity, cell viability, and lactate dehydrogenase (LDH) release. The generation of cellular reactive oxygen species (ROS) and the activation of ERK1/2 were determined at different time points starting from the beginning of preconditioning with anoxia or diazoxide (an mKATP opener). RESULTS:Cell viability and SOD activity in the APC [(81.9 +/- 11.4)%, (13.6 +/- 3.7) U/L] and diazoxide [(79.2 +/- 12.4)%, (16.5 +/- 4.6) U/L] groups were significantly higher than in the anoxia/reoxygenation (A/R) [(42.2 +/- 7.3)%, (8.8 +/- 2.8) U/L] group (all P < 0.01). LDH activity in the APC group [(101.9 +/- 18.9) U/L] and diazoxide group [(97.5 +/- 17.7) U/L] was significantly lower than in the A/R group [(250.5 +/- 43.6) U/L] (all P < 0.01). Both APC and diazoxide simultaneously facilitated intracellular ROS generation and rapid ERK1/2 activation. But the effects of APC and diazoxide were remarkedly attenuated by 5-HP (an mKATP blocker) and by MPG (a free radical scavenger). In addition, the ERK1/2 inhibitor PD98059 also abolished the cellular protective effects induced by diazoxide. CONCLUSION:mKATP may mediate ERK1/2 activation during anoxia preconditioning by generating ROS, which then triggers the delayed protection of APC in rat cardiomyocytes.
journal_name
Chin Med J (Engl)journal_title
Chinese medical journalauthors
Gong KZ,Zhang ZG,Li AH,Huang YF,Bu P,Dong F,Liu Jkeywords:
subject
Has Abstractpub_date
2004-03-01 00:00:00pages
395-400issue
3eissn
0366-6999issn
2542-5641journal_volume
117pub_type
杂志文章abstract:BACKGROUND:It remains controversial whether patients with Stage II colorectal cancer would benefit from adjuvant chemotherapy after radical resection. The aim of this study was to establish two mathematical models to identify the suitable patients for adjuvant chemotherapy. METHODS:The current study comprised of two s...
journal_title:Chinese medical journal
pub_type: 杂志文章
doi:10.4103/0366-6999.213432
更新日期:2017-09-05 00:00:00
abstract:BACKGROUND:Low molecular weight heparin (LMWH), as one of anticoagulant drugs, has been used for the treatment of chronic obstructive pulmonary disease (COPD) with prethrombotic state, but the specific use time is unclear. The aim of the study is to observe the effect of LMWH at two different periods of prethrombotic s...
journal_title:Chinese medical journal
pub_type: 杂志文章
doi:
更新日期:2014-01-01 00:00:00
abstract:BACKGROUND:Diffusion weighted imaging with background suppression (DWIBS) is potentially useful in detecting metastatic lymph nodes. This study aimed to evaluate the efficacy of DWIBS at 3T magnetic resonance (MR) for diagnosing metastatic lymph nodes in cervical cancer. METHODS:This retrospective study included 25 pa...
journal_title:Chinese medical journal
pub_type: 杂志文章
doi:
更新日期:2010-10-01 00:00:00
abstract:BACKGROUND:Multiple neonatal characteristics and adult cardiovascular risk factors are associated with the development of atherosclerosis, however little conclusive evidence exists characterizing the relative strength of these factors. In a large retrospective study, we investigated the association between both objecti...
journal_title:Chinese medical journal
pub_type: 杂志文章
doi:
更新日期:2010-09-01 00:00:00
abstract::Preeclampsia is represented by hypertension and proteinuria in pregnancy. It usually occurs after 20 gestational weeks. There are few reports on preeclampsia before 20 gestational weeks. In this case, we report a patient with chronic hypertension superimposed with preeclampsia at 13 gestational weeks. ...
journal_title:Chinese medical journal
pub_type: 杂志文章,评审
doi:
更新日期:2012-06-01 00:00:00
abstract:BACKGROUND:Infertility is a major medical and social problem, and elementary research on the spermatozoal proteins and their functions are relatively scarce and there are very few confirmed and effective options for the treatment of male infertility. Thus, it is essential to find candidate proteins that affect male inf...
journal_title:Chinese medical journal
pub_type: 杂志文章
doi:
更新日期:2010-10-01 00:00:00
abstract:BACKGROUND:Hypoxia-inducible factor-1alpha (HIF-1alpha) is a transcriptional factor that could improve the stimulation of angiogenesis and the metabolic adaptation of tumor cells to hypoxia. A recent study showed that HIF-1alpha could induce colon cancer cells epithelial-mesenchymal transition (EMT). However, no eviden...
journal_title:Chinese medical journal
pub_type: 杂志文章
doi:
更新日期:2006-05-05 00:00:00
abstract:OBJECTIVE:To elucidate the transmission dynamic and epidemic trend of bancroftian filariasis occurred under the condition with no control measure taken 5 years after elimination of filariasis. METHODS:A 10-year longitudinal observation (from 1984 to 1994) was made in Huayuan Village in Shengli Township of Tancheng Cou...
journal_title:Chinese medical journal
pub_type: 杂志文章
doi:
更新日期:1998-03-01 00:00:00
abstract::We presented the experimental results of endothelial cells (EC) seeding in small caliber interpositional dacron grafts of canine carotid arteries. Six weeks after surgery, 9 (56.25%) seeded, and 6 (37.5%) control grafts remained patent. The mean thrombus-free surface area was 83.4% in the seeded and 62% in the control...
journal_title:Chinese medical journal
pub_type: 杂志文章
doi:
更新日期:1989-08-01 00:00:00
abstract:BACKGROUND:Chimerism analysis is an important tool for the surveillance of post-transplant engraftment. It offers the possibility of identifying impending graft rejection and recurrence of underlying malignant or non-malignant disease. Here we investigated the quantitative chimerism kinetics of 21 relapsed leukemia pat...
journal_title:Chinese medical journal
pub_type: 杂志文章
doi:
更新日期:2012-06-01 00:00:00
abstract:BACKGROUND:Cubital tunnel syndrome is a well-recognized clinical condition and is the second most common peripheral compression neuropathy. This study was designed to investigate the causes of cubital tunnel syndrome by surgical means and to assess the clinical value of the neurophysiological diagnosis of cubital tunne...
journal_title:Chinese medical journal
pub_type: 杂志文章
doi:
更新日期:2004-09-01 00:00:00
abstract::The effects of anisodamine on acetylcholine-induced endothelium-dependent relaxation were studied in organ chambers and under bioassay conditions. In organ chamber experiments, both acetylcholine and bradykinin induced an endothelium-dependent relaxation of norepinephrine-contracted canine femoral arteries in a concen...
journal_title:Chinese medical journal
pub_type: 杂志文章
doi:
更新日期:1992-08-01 00:00:00
abstract::A 30-year-old female patient with coexisting ankylosing spondylitis and rheumatoid arthritis was diagnosed and treated. The human leukocyte antigen (HLA)-B27 is a predisposing factor of ankylosing spondylitis and HLA-DR4 is a predisposing factor of rheumatoid arthritis. This patient was HLA-B27 and HLA-DR4 positive, a...
journal_title:Chinese medical journal
pub_type: 杂志文章,评审
doi:
更新日期:2011-10-01 00:00:00
abstract::Pleomorphic xanthoastrocytoma (PXA) is a rare benign tumor that is usually located in the superficial cerebral hemisphere. Most reports of PXAs have included only a single case or small series. Therefore, the data with respect to the natural history of this tumor are fragmentary. We report a case of a PXA in the unusu...
journal_title:Chinese medical journal
pub_type: 杂志文章,评审
doi:
更新日期:2012-01-01 00:00:00
abstract:BACKGROUND:Transcatheter aortic valve implantation (TAVI) has emerged as the treatment choice for non-operable patients with severe symptomatic aortic stenosis (AS) and may be a good alternative to surgery for those at very high or prohibitive surgical risk. We performed a meta-analysis to evaluate the comparative bene...
journal_title:Chinese medical journal
pub_type: 杂志文章,meta分析
doi:
更新日期:2013-03-01 00:00:00
abstract:BACKGROUND:It is difficult and time-consuming for carrying out conventional hand-sewn bilioenteric anastomosis, especially for small bile duct anastomosis and laparoscopic procedure. In order to simplify it, we have developed a novel procedure of sutureless bilioenteric anastomosis with an intraluminal degradable stent...
journal_title:Chinese medical journal
pub_type: 杂志文章
doi:
更新日期:2011-07-05 00:00:00
abstract::In this paper, the mutagenicity and carcinogenicity of alternariol monomethyl ether (AME), alternariol (AOH), and their relevance to the etiology of human esophageal cancer were studied. These mycotoxins were produced by Alternaria alternata which was the main contaminating fungi isolated from the grain in Linxian Cou...
journal_title:Chinese medical journal
pub_type: 杂志文章
doi:
更新日期:1992-05-01 00:00:00
abstract:BACKGROUND:Endogenous hydrogen sulfide is a new neuromodulator which takes part in the regulation of central nervous system physiology and diseases. Whether endogenous hydrogen sulfide in the central nervous system regulates cardiovascular activity is not known. In the present study, we observed the hemodynamic changes...
journal_title:Chinese medical journal
pub_type: 杂志文章
doi:
更新日期:2011-11-01 00:00:00
abstract:BACKGROUND:Human urotensin II (UII) is the most potent mammalian vasoconstrictor identified so far. Our previous study showed that UII is a potent mitogen of airway smooth muscle cells (ASMC) inducing ASMC proliferation in a dose-dependent manner. The signal transduction pathway of UII mitogenic effect remains to be cl...
journal_title:Chinese medical journal
pub_type: 杂志文章
doi:
更新日期:2004-01-01 00:00:00
abstract:BACKGROUND:In the past 5 years, new treatment materials and techniques offering a different concept in endovascular treatment have been described for cerebral arteriovenous malformations (CAVMs). The aim of this study was to assess the endovascular treatment of CAVMs by using a liquid embolic material, Onyx (Micro Ther...
journal_title:Chinese medical journal
pub_type: 杂志文章
doi:
更新日期:2005-12-20 00:00:00
abstract::100 women ranging in age from 26-34 years were followed up for 4-21 months after undergoing sterilization by tubal occlusion using intraluminal threads and silver clips. The number of children/woman ranged from 1-5 with 80% having 2. 31 women underwent sterilization postmenstrually, 11 midmenstrually, 28 premenstrua...
journal_title:Chinese medical journal
pub_type: 杂志文章
doi:
更新日期:1983-08-01 00:00:00
abstract:OBJECTIVE:To determine the relationship between remodeling and dysfunction of left ventricle (LV) and the expression of the angiotensin II AT1 receptor mRNA after myocardial infarction (MI) in rats. METHODS:Nine MI rats (Group A) and 8 sham-operated rats (Group B) were studied by both Doppler echocardiography and Dot ...
journal_title:Chinese medical journal
pub_type: 杂志文章
doi:
更新日期:1999-07-01 00:00:00
abstract:BACKGROUND:The expression of TES, a novel tumor suppressor gene, is found to be down-regulated in the left anterior descending aorta of patients with coronary artery disease (CAD) compared with non-CAD subjects. This study aimed to investigate the expression of TES during the development of atherosclerosis in rabbits. ...
journal_title:Chinese medical journal
pub_type: 杂志文章
doi:10.4103/0366-6999.158370
更新日期:2015-06-20 00:00:00
abstract:BACKGROUND:The SYNergy between percutaneous coronary intervention with TAXus and cardiac surgery Score II (SS-II) can well predict 4-year mortality in patients with complex coronary artery disease (CAD), and guide decision-making between coronary artery bypass graft surgery and percutaneous coronary intervention (PCI)....
journal_title:Chinese medical journal
pub_type: 杂志文章
doi:10.4103/0366-6999.162510
更新日期:2015-08-20 00:00:00
abstract:BACKGROUND:A satisfactory animal model of breast cancer metastasizing to bone is unavailable. In this study, we used human breast cancer stem-like cells and human bone to build a novel "human-source" model of human breast cancer skeletal metastasis. METHODS:Human breast cancer stem-like cells, the CD44+/CD24-/lower su...
journal_title:Chinese medical journal
pub_type: 杂志文章
doi:
更新日期:2008-10-20 00:00:00
abstract:OBJECTIVE:To reveal the sequence of events of osteoclastic resorption taking place in the cortical bone of the femoral neck in aged women. MATERIAL AND METHODS:The cross sections of cortical bones of the femoral neck from 7 aged women who underwent endoprosthetic replacement for intracapsular hip fracture, were proces...
journal_title:Chinese medical journal
pub_type: 杂志文章
doi:
更新日期:1996-09-01 00:00:00
abstract:OBJECTIVE:To evaluate the use of oxygen in neonates in the past, present and future. DATA SOURCES:The data are mainly from Pubmed with relevant published articles from the 1940s to the present with some information gathered from web searches. STUDY SELECTION:Studies evaluating the use of oxygen in premature and term ...
journal_title:Chinese medical journal
pub_type: 杂志文章,评审
doi:
更新日期:2010-10-01 00:00:00
abstract::This study demonstrates that there are distinct abnormalities of vitamin D and calcium metabolism in children with nephrotic syndrome (NS) and normal renal function. In patients with active NS, serum calcium, ionized calcium, 25-OHD3 and CT were decreased, plasma PTH level was increased and serum ALP was elevated. The...
journal_title:Chinese medical journal
pub_type: 杂志文章
doi:
更新日期:1992-10-01 00:00:00
abstract:BACKGROUND:Congenital uterine anomalies are associated with the highest incidence of reproductive failure and obstetric complications. This study aimed to summarize the clinical characteristics and prenatal outcome of pregnancy in women with congenital uterine malformations. METHODS:This retrospective study evaluated ...
journal_title:Chinese medical journal
pub_type: 杂志文章
doi:
更新日期:2010-02-20 00:00:00
abstract:BACKGROUND:Susceptibility to coronary artery disease (CAD) and diabetes is encoded by distinct, tightly-linked single nucleotide polymorphisms on chromosome 9p21. This study aimed to examine the association of variant rs1333049 on chromosome 9p21.3 with early-onset and severity of CAD in Chinese patients with and witho...
journal_title:Chinese medical journal
pub_type: 杂志文章
doi:10.3901/jme.2011.08.066
更新日期:2011-01-01 00:00:00