Synergistic effect of insulin and selenium in combination on inhibiting myocardial apoptosis in rats with diabetic cardiomyopathy / 中国病理生理杂志

AIM:To investigate the effect of insulin and selenium in combination on the apoptosis and the ex-pression of Ku70, acetylated Ku70, Bax and cytochrome C in myocardial cells of the rats with diabetic cardiomyopathy (DCM), and to explore the mechanism of insulin and selenium in their synergistic anti-DCM effect.METHODS:SD rats (n=50) were randomly grouped into control, DCM, DCM with insulin treatment (DCM+In) group, DCM with selenium treatment (DCM+Se) group, and DCM with insulin and selenium combination treatment (DCM+In+Se) group.Mito-chondrial membrane potential ( MMP) was measured by flow cytometry .The cell apoptosis was observed by terminal-deoxy-nucleotidyl transferase mediated nick end labeling (TUNEL).The levels of Ku70, Bax and cytochrome C were examined by Western blot .The acetylation status of Ku 70 was detected by co-immunoprecipitation .RESULTS: The rats in DCM group showed marked cell apoptosis compared with the control rats .The levels of Ku70 and acetylated Ku70 declined sig-nificantly compared with control group .Bax significantly translocated from cytoplasm into mitochondria and cytochrome C translocated from mitochondria into cytoplasm compared with control group .Compared with DCM +In group or DCM +Se group, insulin and selenium in combination significantly inhibited the apoptosis , down-regulated Ku70 and acetylated Ku70 levels, and prevented Bax and cytochrome C translocation .CONCLUSION: Insulin and selenium synergistically inhibits myocardial apoptosis by regulating Ku 70 acetylation and inhibiting Bax translocation .

Role of ubiquitin ligase Cbl-b-regulated p38MAPK in insulin and selenium synergistic anti-myocardial apoptosis in diabetic cardiomyopathy / 中国药理学通报

Aim To explore the mechanism of insulin in combination with selenium preventing myocardial apoptosis in diabetic cardiomyopathy rats .Methods SD rats ( n =50 ) were randomly divided into five groups: control , diabetic cardiomyopathy ( DCM ) , DCM with insulin treatment , DCM with selenium treat-ment, and DCM with insulin and selenium combination treatment .The cell apoptosis was observed by TUNEL . The levels of Bcl-2, caspase-3, PARP, Cbl-b and p38 MAPK were examined by Western blot .The inter-actions of Cbl-b-p38 MAPK and Ku70-Bax were detec-ted by immunoprecipitation .Results Insulin in com-bination with selenium synergistically inhibited apopto-sis, up-regulated Cbl-b, down-regulated p38MAPK ex-pressions and increased the interactions of Cbl-b-p38MAPK and Ku70-Bax.Conclusion Insulin and selenium synergistically inhibit myocardial apoptosis by regulating Cbl-b-inhibited p38 MAPK and preventing Bax translocation .

Effect of xy2004, a centchroman derivative, on proliferation of MCF-7 cells in vitro and the mechanism / 南方医科大学学报

<p><b>OBJECTIVE</b>To investigate the effect of xy2004, a centchroman derivative, on the proliferation of MCF-7 cells and the mechanisms.</p><p><b>METHODS</b>The effects of xy2004 on MCF-7 cell proliferation and apoptosis were evaluated with MTT assay and flow cytometry, respectively. The expressions of the apoptosis-related proteins were examined with Western blotting. Competitive estrogen-receptor binding assay was used to investigate the affinity of xy2004 to estrogen receptors (ER).</p><p><b>RESULTS</b>xy2004 induced proliferation of MCF-7 cells at low concentrations but inhibited cell proliferation at high concentrations. The application of tamoxifen inhibited xy2004-induced proliferation of MCF-7 cells. The relative binding affinity of xy9906 to ERα and ERβ, presented as the IC50 value, was 7.38 × 10⁻³ mol/L and 4.12 × 10⁻⁷ mol/L, respectively. Treatment of MCF-7 cells with high-concentration xy2004 reduced the cellular expression of Bcl-2 protein and increased Bax protein expression.</p><p><b>CONCLUSION</b>At low concentrations, xy2004 directly stimulates the proliferation of MCF -7 cells through ligand-receptor binding, and at high concentrations, it inhibits the cell proliferation by regulating the expression levels of the apoptosis-related proteins.</p>

Application of diversified teaching modes in functional experiment / 中华医学教育探索杂志

Diversified teaching methods including traditional teaching,problem based learning,interactive teaching and team cooperation teaching were adopted in the process of teaching.Problem based learning can stimulate students' learning interests; interactive teaching can improve the students' hands-on ability and team cooperation teaching can cultivate students' cooperation spirits.Diversified teaching mode made different teaching methods integrated and complemented each other,forming a special teaching mode for the course of functional experiment.

Application of comparative approach in the teaching of efferent nervous pharmacology / 中华医学教育探索杂志

This paper introduces the comparative approach including its implication,implementing ways and values in efferent nervous pharmacological teaching from characteristics of efferent nervous pharmacology.It can be concluded that comparative approach is the suitable teaching method in the teaching of efferent nervous pharmacology.

Changes of cholinergic nerves and tumor necrosis factor-α in doxorubicin-induced rat failing heart / 南方医科大学学报

<p><b>OBJECTIVE</b>To investigate the changes of cholinergic nerves in doxorubicin (DOX)-induced rat failing heart and tumor necrosis factor-α (TNF-α) in the heart tissue and serum.</p><p><b>METHODS</b>Adult Sprague-Dawley rats were randomized into control (n=10) and DOX-induced chronic heart failure (CHF) groups (n=15), and in the latter group, the rats were given intraperitoneal injections of 2.5 mg/kg DOX once a week for 6 weeks, with a total cumulative dose of 15 mg/kg. The control rats were injected with normal saline (1 ml/week). Karnovsky-Roots histochemical staining combined with point counting was used to demonstrate the distribution of cholinergic nerves in the heart. The expression levels of TNF-α in the heart tissue and serum were determined with ELISA.</p><p><b>RESULTS</b>Positively stained cholinergic nerves were found in all the rat hearts in the two groups, but in CHF group, the point counts of cholinergic nerves were significantly lower than that of the control group (P<0.01). Compared with the control rats, those with DOX-induced CHF showed elevated levels of TNF-α both in the heart tissue and in the serum (P<0.01).</p><p><b>CONCLUSION</b>In rats with DOX-induced CHF, the parasympathetic nervous system is down-regulated in the failing heart, and the diminished cholinergic anti-inflammatory pathway may play an important role in the progression of CHF.</p>

Practice and Consideration on Pharmacology Teaching / 中华医学教育探索杂志

This paper reviews some problems from five aspects such as being good at querying to enlighten students to think on their own,giving examples skillfully to arouse study interesting,summarizing timely to improve study efficiency,linking with clinic to cultivate the practice capability and using multimedia reasonably.