Chlamydia psittaci SINC protein inhibits host cell apoptosis through activating MAPK/ERK signaling pathway / 中华微生物学和免疫学杂志

Objective:To investigate the effects of SINC, a novel secreted protein of Chlamydia psittaci, on the apoptosis of host cells and the regulatory role of mitogen-activated protein kinase/extracellular signal-regulated kinase (MAPK/ERK) signaling pathway in it. Methods:HeLa cells were treated with recombinant SINC. The expression of Bax and Bcl-2 at protein level and the phosphorylation of ERK1/2 were analyzed by Western blot. Hoechst 33258 staining was used to detect the apoptosis of HeLa cells after SINC stimulation. Moreover, HeLa cells were pretreated with MEK1/2 inhibitor U0126 (50 μmol/L), and then stimulated with different concentrations of SINC for different time. Flow cytometry was used to detect the changes in cell apoptosis rates and Western blot was performed to detect the expression of Bax and Bcl-2 at protein level.Results:Treating HeLa cells with 10 μg/ml of SINC for 18 h resulted in down-regulated Bax and up-regulated Bcl-2 at protein level. Besides, the ratio of Bax/Bcl-2 was the lowest and a significant increase in the ratio of phosphorylated ERK1/2 (p-ERK1/2) to ERK1/2 was observed. Hoechst 33258 staining showed that the number of apoptotic bodies decreased significantly after stimulating HeLa cells with 5, 10 and 15 μg/ml of SINC. In the presence of MEK1/2 inhibitor U0126, the expression of Bcl-2 at protein level was down-regulated, while the expression of cleaved PARP was significantly up-regulated. Flow cytometry showed a significantly enhanced apoptosis of HeLa cells.Conclusions:SINC can inhibit the apoptosis of HeLa cells through activating the MAPK/ERK signaling pathway.

Internal carotid artery bifurcation aneurysms / 国际脑血管病杂志

Internal carotid artery bifurcation aneurysm is relatively rare in clinical practice. It locates at the bifurcation of the internal carotid artery, with numerous branches and perforating vessels running through it. Whether endovascular treatment or craniotomy clipping, it is necessary to ensure the patency of the branches and perforating vessels. There are very few systematic reports on internal carotid artery bifurcation aneurysms. This article summarizes its definition, epidemiology, formation and rupture mechanisms, clinical features, and imaging features, with a focus on explaining its classification and treatment.

Regulation of c-Jun signaling pathway in peripheral nerve demyelination / 中华神经医学杂志

After peripheral nerve injury (PNI),myelinated Schwann cells undergo demyelination,dedifferentiation and proliferation,then migrate along basal lamina tubes and align to form the longitudinal cell strands known as bands of Btüngner,which creates suitable conditions for axonal regeneration and remyelination.By reviewing literature,we found that the expression of a transcriptional factor c-Jun increased during demyelination process after PNI,and increasing evidences suggested that demyelination and c-Jun signaling pathways were closely related.This review summarized the research situation and progress of c-Jim signaling pathways regulating demyelination process after peripheral nerve injury.

The relevance between the clinical manifestion and operation of lumbar dise herniation / 中国基层医药

Objective To analyze the experience of 745 cases of lumbar disc herniation(LDH) and investigate the relevance between the clinical symptoms,signs and operative observation.Methods From 1982 to 2003,745 cases of LDH were treated operatively.In order to investigate the relationship between clinical presentations and operative results,a statistic analysis was conducted using the clinical symptoms,signs and operative observations.Results As the predominant manifestions,the pain in the low back and leg was seen in 96.4% of LDH,the pain aggravated by belly pressure in 93% of LDH,local tenderness and radicular pain around the lumbat spinous process in 70.8% of LDH,rectoleg elevation test(+) in 91.6% of LDH.operation observation:77.6% of LDH was classified as lateral type,10.9% as medial type and 11.5% as rupture or sequestration type.Weakness of extensor hallucis longus could seen in 65.6% of LDH of L_4,L_5,in 32.3% of LDH of L_5S_1.Conclusions Although the extensive usage of computed tomography(CT) and magnetic resonance imaging(MRI) provides a prompt and accurate basis for diagnosis of LDH,the physical examination remains the most important routine way to make a diagnosis.It is suggested that during the diagnosis and treatment of LDH,besides the common features of the disease,some individual presentations should not be neglected in few rare atypical cases,so as to diagnose and treat correctly.

Advanced alcoholic osteonecrosis of femoral head / 中国矫形外科杂志

[Objective]To discuss the relation-ship between AAONFH(advanced alcoholic osteonecrosis of femoral head)and extended overdose drinking.[Method]Reviewed 165 cases of total hip arthroplasty,to analyzed the clinical data among 27 AAONFH cases,reviewed the literatures,discussed the pathogenesis of AAONFH and the relation-ship between blood biochemistry and blood cloting funtion and compared the experimental results among literatures.[Result]Theres various factors resulted in osteonecrosis of the femoral head associated with alcohol long-term over intake.Individuals consuming more than 750 ml of alcohol daily were at greater risk of double or half ONFH,Theres no change in biochemical test,but blood clotting funtion in this case would degrade,osteoarthritis of hip would synchronize.[Conclusion]Individuals consuming more than 750 ml of alcohol daily have the potentiality of ONFH;Its no specificity significance in biochemical test,the necrosis extent of the femoral head is relative to the capacity and times of alcohol intake.THR(total hip replacement)is the best treatment for AAONFH,but theres more staxis potentiality in this cases.