The efficacy and safety of apatinib plus capecitabine in platinum-refractory metastatic and/or recurrent nasopharyngeal carcinoma: a prospective, phase II trial.

BACKGROUND: Previous studies have shown that monotherapy with apatinib, an oral tyrosine kinase inhibitor, has promising efficacy for treating recurrent or metastatic (RM) nasopharyngeal carcinoma (NPC) patients. In this study, we aimed to assess the efficacy and safety of apatinib combined with capecitabine as a second-line therapy or beyond for treating RM-NPC patients who failed the first-line platinum-based chemotherapy. METHODS: In this single-arm, phase II study, we enrolled RM-NPC patients who had at least one measurable lesion according to the Response Evaluation Criteria in Solid Tumors (RECIST v1.1). The sample size was determined using Simon's two-stage design. All patients were administered with apatinib 500 mg once daily and capecitabine 1000 mg/m2 twice per day on days 1-14 of each 21-day cycle. The primary endpoint was the objective response rate (ORR), and the secondary endpoints comprised disease control rate (DCR), duration of response (DoR), progression-free survival (PFS), overall survival (OS), and safety. RESULTS: We enrolled 64 patients from September 2018 to August 2020. The ORR and DCR were 39.1% (95% CI, 27.1-52.1) and 85.9% (95% CI, 75.0-93.4), respectively. The median DoR was 14.4 months (95% CI, 7.8-21.0). As of April 20, 2021, the median follow-up duration was 12.0 months. The median PFS was 7.5 months (95% CI, 5.0-10.0) and the median OS was 15.7 months (95% CI, 11.3-20.1). The most common toxicities of any grade were anemia (75.0%), hand-foot syndrome (65.6%), and proteinuria (64.0%). Grade 3-4 toxicities were observed in 36 (56.3%) patients, with hypertension (14.1%), mucositis (12.4%), and fatigue (10.9%) most commonly observed. CONCLUSIONS: Apatinib plus capecitabine shows promising efficacy as a second-line treatment option in pretreated platinum-refractory RM-NPC patients. Dose selection of this combination needs further investigation considering the toxicity. TRIAL REGISTRATION: Chi-CTR1800017229.

The presence of microvascular invasion guides treatment strategy in recurrent HBV-related HCC.

OBJECTIVES: We used the status of microvascular invasion (MVI) at primary resection to help treatment selection for hepatitis B virus-positive (HBV+) recurrent hepatocellular carcinoma (rHCC) patients in Barcelona Clinic Liver Cancer (BCLC) stage B-C. METHODS: From 2009 to 2017, we enrolled 221 consecutive HBV+ rHCC patients at BCLC stage B-C who underwent re-resection (RR), radiofrequency ablation (RFA), or transarterial chemoembolization (TACE). Post recurrence survival (PRS) and overall survival (OS) were compared between RR/RFA and TACE according to MVI status. A one-to-one propensity score matching analysis was performed. RESULTS: For MVI(-) patients, the median PRS was 62.3 months for the RR/RFA group and 21.1 months for the TACE group (p = 0.039). The corresponding OS was 71.4 months and 26.6 months, respectively (p = 0.010). For MVI(+) patients, the median PRS in the RR/RFA group and TACE group was 14.7 months and 10.1 months (p = 0.115). The corresponding OS was 23.4 months and 16.4 months, respectively (p = 0.067). After matching, the dominance of RR/RFA over TACE remained in MVI(-) patients for both PRS (62.3 months vs 15.3 months, p = 0.019) and OS (98.1 months vs 33.4 months, p = 0.046). No significant difference was found in MVI(+) patients for either PRS (14.7 months vs 11.8 months, p = 0.593) or OS (23.4 months vs 28.1 months, p = 0.662). CONCLUSIONS: MVI status definitely helps select treatment options in HBV+ rHCC patients. For MVI(-) patients, RR/RFA provided better survival than TACE while for MVI(+) patients, TACE shared similar survival outcomes. KEY POINTS: • This study aimed at the determination of the optimal treatment options (ablation /resection vs TACE) in case of recurrent HBV-related HCC. • It showed that MVI status, established at primary resection of HCC, was a powerful marker for selecting the best treatment option in these patients. • In MVI(-) patients, RR/RFA achieved a better survival than TACE. In MVI(+) patients, TACE shared similar survival.

Preoperative prediction of microvascular invasion in hepatocellular cancer: a radiomics model using Gd-EOB-DTPA-enhanced MRI.

OBJECTIVES: Preoperative prediction of microvascular invasion (MVI) in patients with hepatocellular cancer (HCC) is important for surgery strategy making. We aimed to develop and validate a combined intratumoural and peritumoural radiomics model based on gadolinium-ethoxybenzyl-diethylenetriamine (Gd-EOB-DTPA)-enhanced magnetic resonance imaging (MRI) for preoperative prediction of MVI in primary HCC patients. METHODS: This study included a training cohort of 110 HCC patients and a validating cohort of 50 HCC patients. All the patients underwent preoperative Gd-EOB-DTPA-enhanced MRI examination and curative hepatectomy. The volumes of interest (VOIs) around the hepatic lesions including intratumoural and peritumoural regions were manually delineated in the hepatobiliary phase of MRI images, from which quantitative features were extracted and analysed. In the training cohort, machine-learning method was applied for dimensionality reduction and selection of the extracted features. RESULTS: The proportion of MVI-positive patients was 38.2% and 40.0% in the training and validation cohort, respectively. Supervised machine learning selected ten features to establish a predictive model for MVI. The area under the receiver operating characteristic curve (AUC), sensitivity, specificity of the combined intratumoural and peritumoural radiomics model in the training and validation cohort were 0.85 (95% confidence interval (CI), 0.77-0.93), 88.2%, 76.2%, and 0.83 (95% CI, 0.71-0.95), 90.0%, 75.0%, respectively. CONCLUSIONS: We evaluate quantitative Gd-EOB-DTPA-enhanced MRI image features of both intratumoural and peritumoural regions and provide an effective radiomics-based model for the prediction of MVI in HCC patients, and may therefore help clinicians make precise decisions regarding treatment before the surgery. KEY POINTS: • An effective radiomics model for prediction of microvascular invasion in HCC patients is established. • The radiomics model is superior to the radiologist in prediction of MVI. • The radiomics model can help clinicians in pretreatment decision making.

Effect of electroacupuncture intervention on angiogenesis in psoriasis mice. / ç”µé’ˆå¯¹é“¶å±‘ç— å°é¼ è¡€ç®¡ç”Ÿæˆçš„å½±å“åŠæœºåˆ¶ç ”ç©¶.

OBJECTIVES: To observe the effect of electroacupuncture (EA) stimulation of "Zusanli"(ST36) and"Xuehai"(SP10) on the angiogenesis of the local injured skin tissue in mice with psoriasis, so as to explore its mechanisms underlying improvement of psoriasis-induced skin lesions. METHODS: A total of 24 female BALB/c mice aged 6-8 weeks were randomly divided into control, model and EA groups, with 8 mice in each group. The psoriasis-like skin lesion model was established by application of 5% imiquimod (IMQ) cream to the mice's back skin, 62.5 mg/d, for 7 days after local depilation, and the mice of the control group received local application of an equal amount of petroleum jelly once a day for 7 days. EA stimulation (2 Hz/100 Hz) was applied to ST36 and SP10 for 30 min, once daily for 7 consecutive days. Photos of the topical injured skin at the back were taken every day, and the severity of psoriasis lesions (psoriasis area and severity index ï¼»PASIï¼½) was scaled. Following H.E. staining, the morphological changes in the injured skin tissue were observed with epidermal thickness analyzed, and the Masson staining was used to observe the proportion of collagen fibers in the injured skin tissues. Immunohistochemical method was used to detect the expression of microvascular markers CD31 and vascular endothelial growth factor (VEGF) and the microvascular density (MVD) was calculated. Western blot was used to detect the expression levels of CD31, VEGF proteins and mitogen activated protein kinases (MAPK) signaling pathway related proteins p38, phosphorylated p38 (p-p38), extracellular regulated protein kinases (ERK), p-ERK, c-Jun N-terminal kinase (JNK) and p-JNK in the injured skin tissue. RESULTS: Compared with the control group, the mice in the model group showed an evident increase in the erythema score, scales score, skin thickening score and PASI score, epidermal thickness, proportion of the collagen fibers, MVD value of CD31 and VEGF, and expression levels of CD31 and VEGF proteins, and p-p38/p38, p-ERK/ERK and p-JNK/JNK ratios in the injured skin tissue (P<0.001, P<0.01). In contrast to the model group, the EA group had a significant decrease in the levels of all the indexes mentioned above (P<0.05, P<0.01, P<0.001). CONCLUSIONS: EA intervention can improve the psoriasis-like skin lesions induced by IMQ in mice, which may be related with its functions in down-regulating the expression of angiogenic related factors CD31 and VEGF proteins and MAPK signaling pathway related proteins in the topical injured skin tissue.

Evaluation of the proportional hazards assumption and covariate adjustment methods in comparative surgical observational studies with time-to-event endpoints.

INTRODUCTION: Comparative studies on surgical treatments with time-to-event endpoints have provided substantial evidence for clinical practice, but the accurate use of survival data analysis and the control of confounding bias remain big challenges. METHODS: This was a survey of surgical studies with survival outcomes published in four general medical journals and five general surgical journals in 2021. The two most concerned statistical issues were evaluated, including confounding control by propensity score analysis (PSA) or multivariable analysis and testing of proportional hazards (PH) assumption in Cox model. RESULTS: A total of 74 studies were included, comprising 63 observational studies and 11 randomized controlled trials. Among the observational studies, the proportion of studies utilizing PSA in surgical oncology and non-oncology studies was similar (40.9 % versus 36.8 %, P = 0.762). However, the former reported a significantly lower proportion of PH assumption assessments compared to the latter (13.6 % versus 42.1 %, P = 0.020). Twenty-five observational studies (25/63) used PSA methods, but two-thirds of them (17/25) showed unclear balance of baseline data after PSA. And the proportion of PH assumption testing after PSA was slightly lower than that before PSA, but the difference was not statistically significant (24.0 % versus 28.0 %, P = 0.317). Comprehensive suggestions were given on confounding control in survival analysis and alternative resolutions for non-compliance with PH assumption. CONCLUSION: This study highlights suboptimal reporting of PH assumption evaluation in observational surgical studies both before and after PSA. Efforts and consensus are needed with respect to the underlying assumptions of statistical methods.

[Electroacupuncture pretreatment alleviates apoptosis of renal tubular epithelia cells by down-regulating expression of TRPC6 in hyperglycemic mice].

OBJECTIVE: To observe the effect of electroacupuncture (EA) pretreatment on apoptosis of renal tubular epithelial cells in mice with hyperglycemia, so as to explore its mechanisms underlying protecting the kidney from hyperglycemia-induced injury. METHODS: Eighty male C57BL/6 mice were equally and randomly divided into control, model, EA and sham EA groups. The hyperglycemia model was established by intraperitoneal injection of streptozocin (STZ, 50 mg·kg-1·d-1) for 5 consecutive days. Before modeling, EA (2 Hz/15 Hz, 0.3-0.5 mA) was applied to bilateral "Zusanli" (ST36) and "Shenshu" (BL23) for 30 min, once daily for 7 days, while mice in the sham EA group were treated with the same acupoints but without electrical stimulation. The blood glucose values were measured after fasting for 6 hours after 3 days of modeling. The degree of renal tissue injury was observed by microscope after H.E. staining, and the apoptosis level of renal tubular epithelial cells observed by TUNEL staining. The expression levels of transient receptor potential channel 6 (TRPC6) and related apoptotic proteins Caspase-3, Bax and Bcl-2 in the renal tissue were detected by Western blot and immunohistochemistry, separately. RESULTS: Compared with the control group, the blood glucose content and the expression levels of TRPC6, Caspase-3 and Bax proteins, as well as the level of the renal apoptotic cells were significantly increased (P<0.001, P<0.000 1), while the expression level of Bcl-2 protein and the ratio of Bcl-2/Bax were remarkably decreased in the model group (P<0.000 1). In comparison with the model and sham EA groups, the blood glucose content, percentage of apoptotic cells and the expression levels of TRPC6, Caspase-3 and Bax were significantly decreased (P<0.01, P<0.000 1, P<0.05, P<0.001), and the expression level of Bcl-2 and the ratio of Bcl-2/Bax were apparently increased in the EA group (P<0.01, P<0.05, P<0.001). HE statin showed abnormal dilation of the capillary lumen and disappearance of the proximal tubules in the model group, which was relatively milder in the EA group. CONCLUSION: EA pretreatment can lower blood glucose level and reduce renal apoptosis in hyperglycemia mice, which may be related to its effects in down-regulating the expression of TRPC6 and Caspase-3 and up-regulating the ratio of Bcl-2/Bax.

[Electroacupuncture preconditioning alleviates kidney injury in hyperglycemic mice].

OBJECTIVE: To explore the protective effect and molecular mechanism of electroacupuncture (EA) preconditioning on renal injury induced by streptozotocin (STZ) in hyperglycemic mice. METHODS: Eighty male C57BL/6 mice were randomly divided into 4 groups: control, model, EA and sham EA groups, n=20 in each group. The hyperglycemic model was established by intraperitoneal injection of 0.1% STZ solution (50 mg/kg) for 5 days. EA preconditioning or sham EA was applied at "Zusanli" (ST36) and "Shenshu" (BL23), once daily for 7 successive days in the EA or sham EA group. Three days after mode-ling, the blood glucose was measured after fasting for 6 hours. The degree of renal injury was observed by HE staining and PAS staining; the expressions of transient receptor potential cation channel 6 (TRPC6) and Nephrin protein in glomerulus were observed by immunohistochemistry; the expressions of TRPC6 and Nephrin protein in renal cortex were detected by Western blot. RESULTS: Compared with the control group, the blood glucose level was significantly increased (P<0.01), the glomerular cross-sectional area was apparently increased (P<0.000 1), the glomerular capillaries dilated, the matrix proliferated, the brush edge of renal tubules disappeared, the proportion of abnormal renal tubules increased (P<0.000 1), and the expressions of TRPC6 and Nephrin in glomeruli and renal tissue were significantly increased (P<0.01) in the model group. Following EA treatment and compared with the model and sham EA groups, the blood glucose was significantly down-regulated (P<0.01), the renal tissue injury was apparently alleviate, the cross-sectional area of glomerulus was reduced (P<0.05), the brush edge of renal tubules changes were obviously improved, the proportion of abnormal renal tubules decreased (P<0.000 1), and the expressions of TRPC6 and Nephrin in glomerulus and renal tissue decreased (P<0.05) in the EA group. CONCLUSION: EA preconditioning can alleviate renal injury in hyperglycemic mice, which is closely related to its effects in reducing renal TRPC6 and Nephrin expressions and inhibiting podocyte activation.

Machine learning to predict high-dose methotrexate-related neutropenia and fever in children with B-cell acute lymphoblastic leukemia.

Methotrexate (MTX), an antimetabolite for the treatment of leukemia, could cause neutropenia and subsequently fever, which might lead to treatment delay and affect prognosis. Here, we aimed to predict neutropenia and fever related to high-dose MTX using artificial intelligence. This study included 139 pediatric patients newly diagnosed with standard- or intermediate risk B-cell acute lymphoblastic leukemia. Fifty-seven SNPs of 16 genes were genotyped. Univariate and multivariate analysis were used to select SNPs and clinical covariates for model developing. Five machine learning algorithms combined with four resampling techniques were used to build optimal predictive model. The combination of random forest with adaptive synthetic appeared to be the best model for neutropenia (sensitivity = 0.935, specificity = 0.920, AUC = 0.927) and performed best for fever (sensitivity = 0.818, specificity = 0.924, AUC = 0.870). By machine learning, we have developed and validated comprehensive models to predict the risk of neutropenia and fever. Such models may be helpful for medical oncologists in quick decision-making.

Phragmunis a suppresses glioblastoma through the regulation of MCL1-FBXW7 by blocking ELK1-SRF complex-dependent transcription.

Glioblastoma (GBM) is a highly aggressive brain tumor. During screening work, we found a new compound named phragmunis A (PGA), which is derived from the fruitbody of Trogia venenata, exhibits a potential cytotoxic effect on patient-derived recurrent GBM cells and temozolomide (TMZ)-resistant cell lines. The present study was designed to investigate the potential molecular mechanism of the anti-glioma effects of PGA in vitro and in vivo. Studies investigating the mechanism revealed that PGA diminished the binding efficiency of ETS family of transcription factor (ELK1) and Serum response factor (SRF), and suppressed ELK1-SRF complex-dependent transcription, which decreased the transcriptional levels of downstream genes Early growth response protein 1 (EGR1)-Polycomb ring finger (BMI1), thus inducing the imbalanced regulation between Myeloid cell leukaemia-1 (MCL1) and F-Box and WD repeat domain containing 7 (FBXW7). Finally, orthotopic xenograft models were established to confirm the anti-glioma effect of PGA on tumour growth. We showed, for the first time, that the cytotoxic effects of PGA occurred by inducing MCL1 inhibition and FBXW7 activation by blocking ELK1-SRF complex-dependent transcription. The blockage of ELK1-mediated transcription resulted in the suppression of EGR1-BMI1, which led to the upregulation of FBXW7 expression and downregulation of MCL1. These findings suggested that PGA could be a therapeutic drug candidate for the treatment of recurrent GBM by targeting the ELK1-SRF complex.

Treatment selection of recurrent hepatocellular carcinoma with microvascular invasion at the initial hepatectomy.

BACKGROUND: Recurrent hepatocellular carcinoma (rHCC) patients with microvascular invasive (MVI) positive at first resection usually had poorly differentiated tumors and worse survivals. The optimal treatment for this population remains to be elucidated. METHODS: We retrospectively analyzed 319 rHCC patients with MVI-positive at first resection from June, 2009 to June, 2017. Survival and costs between curative treatments [re-resection (RR) and radiofrequency ablation (RFA)] and transarterial chemoembolization (TACE) were compared. Subgroup comparisons were made in patients in Barcelona Clinic Liver Cancer (BCLC) stage 0-A and BCLC stage B-C, respectively. A one-to-one propensity score matching (PSM) was used to diminish bias. RESULTS: In BCLC stage 0-A, 98 received RR/RFA, and 49 received TACE. The median overall survival (OS) of RR/RFA group was not reached, while the OS of TACE group was 26.3 months (P=0.001). After matching, the OS of the RR/RFA group was longer than that of the TACE group (39.5 vs. 26.3 months, P=0.045). In BCLC stage B-C, 137 patients received TACE, 11 received RR and 24 received RFA. The median OS was 29.8 months, 17.9 months and 11.1 months for RR, RFA and TACE group, respectively. No significant difference was found between RR and TACE (P=0.237) or RFA and TACE (P=0.484) after matching. Costs of the TACE group was significantly lower than that of the RR group but similar to that of the RFA group. CONCLUSION: RR/RFA provided better survival outcomes for rHCC patients with MVI-positive at first resection in selected BCLC stage 0-A. In selected BCLC stage B-C, TACE shared a similar efficacy with RR and RFA but a lower cost than RR.

High-Tech Acupuncture for Prevention of Lifestyle Diseases-A Sino-Austrian Cooperation Research Protocol on Heart Rate Variability.

BACKGROUND: Acupuncture can not only be used for well-known diseases, but also for so-called modern lifestyle-related diseases. Using innovative methods like e.g. new analyses of heart rate variability (HRV), it is also possible to investigate diseases like burnout syndrome, ie., qi deficiency in Chinese medicine (CM). OBJECTIVE: The main object of this research protocol is to perform research on the relationship of burnout syndrome and heart rate (HR) and HRV. METHODS: A total of 175 patients with burnout syndrome (qi deficiency syndrome) in five groups and 35 healthy volunteers will be investigated. Based on random numbers generated by computer and concealed in opaque envelops, the patients will be assigned to four acupuncture groups using Zusanli (ST 36) acupuncture stimulation, Guanyuan (CV4) acupuncture stimulation, both points, and both points with Streitberger device respectively, and a moxibustion group using both points mentioned above, with 35 cases in each group. Altogether four different experiments are planned. Experiment 1 includes 70 subjects and is a comparison between a burnout group and a control group (healthy volunteers). The evaluation parameters are different scores and indices of HR and HRV. Experiment 2 includes 140 subjects and compares the efficacy of different acupuncture points. In experiment 3 (105 subjects), acupuncture and moxibustion should be compared to healthy volunteers. Experiment 4 (70 subjects) investigates the long-term therapeutic effects of acupuncture and moxibustion on the scores of qi deficiency and HR/HRV in qi deficiency patients. In both the acupuncture and moxibustion groups, a total of 10 treatments will be performed. CONCLUSIONS: The joint research aims at the scientific evaluation of CM, mainly in the field of HRV. This parameter could be a very good indicator of the state of health and can be inflfluenced by different acupuncture methods, as shown in the past.

[Comparison of Protective Effect of Electroacupuncture on Myocardial Ischemia Injury Between Different Acupoint Formulas in Rats].

OBJECTIVE: To observe the different effects of electroacupucnture of "Neiguan" (PC 6) grouping with other acupoints on myocardial ischemia (MI) injury, so as to provide evidence for clinical acupoint formulas. METHODS: Forty Wistar male rats were randomly divided into normal, model, EA 1[bilateral "Neiguan" (PC 6), bilateral "Zusanli" (ST 36),"Guanyuan" (CV 4)], and EA 2[bilateral "Neiguan" (PC 6), bilateral "Shenmen" (HT 7), "Danzhong" (CV 17)] groups, 10 rats in each group. The MI model was established by subcutaneous injection with ISO solution(5 mL/kg), once per day for 7 days. Both EA 1 and EA 2 groups were subjected to EA (2 Hz/100 Hz, 1 mA) for 10 min before subcutaneous injection, once daily for 21 days. Electrocardiogram (ECG) was recorded after treatment. Serum cTnT was detected by biochemistry. SOD, GSH-Px and MDA in myocardial tissues of left ventricular were measured by ELISA, and the ultrastructural changes of myocardial cells in the left ventricular were observed by electron microscope. RESULTS: Compared with the normal group, the amplitude of S-T segment and HR of ECG, cTnT and MDA contents were significantly increased in the model group (P<0.01) accompanied with seriously destroyed ultrastructure in the myocardial tissue, while SOD and GSH-Px levels were lower than those in the normal group (P<0.01). However, EA treatments reversed all the abnormal changes in the model group (P<0.05). There was no significant difference between EA 1 and EA 2 groups in the amplitude of S-T segment and HR (P>0.05); cTnT and MDA levels in the EA 1 group were lower than those in the EA 2 group (P<0.05), while SOD and GSH-Px levels were higher than those in the EA 2 group (P<0.05), accompanied with lighter degree of ultrastructure damage in the myocardial tissue in the EA 1 group. CONCLUSIONS: EA can prevent myocardial ischemic injury, and the effect of EA 1 treatment was better than that of EA 2.

Puerarin Ameliorates D-Galactose Induced Enhanced Hippocampal Neurogenesis and Tau Hyperphosphorylation in Rat Brain.

Enhanced neurogenesis has been reported in the hippocampus of patients with Alzheimer's disease (AD), the most common neurodegenerative disorder characterized with amyloid-ß (Aß) aggregation, tau hyperphosphorylation, and progressive neuronal loss. Previously we reported that tau phosphorylation played an essential role in adult hippocampal neurogenesis, and activation of glycogen synthase kinase (GSK-3), a crucial tau kinase, could induce increased hippocampal neurogenesis. In the present study, we found that treatment of D-galactose rats with Puerarin could significantly improve behavioral performance and ameliorate the enhanced neurogenesis and microtubule-associated protein tau hyperphosphorylation in the hippocampus of D-galactose rat brains. FGF-2/GSK-3 signaling pathway might be involved in the effects of Puerarin on hippocampal neurogenesis and tau hyperphosphorylation. Our finding provides primary in vivo evidence that Puerarin can attenuate AD-like enhanced hippocampal neurogenesis and tau hyperphosphorylation. Our finding also suggests Puerarin can be served as a treatment for age-related neurodegenerative disorders, such as AD.

PKCε inhibits isolation and stemness of side population cells via the suppression of ABCB1 transporter and PI3K/Akt, MAPK/ERK signaling in renal cell carcinoma cell line 769P.

Protein kinase C epsilon (PKCε), a member of the novel PKC family, is known to be a transforming oncogene and tumor biomarker for many human solid cancers including renal cell carcinoma (RCC). We isolated side population (SP) cells from the RCC 769P cell line, and proved that those cells possess cancer stem cell (CSC) characteristics. In this study, to identify the function of PKCε in cancer stemness of 769P SP cells, we reduced the expression of PKCε in those cells, following the results demonstrated that PKCε depletion had a negative correlation with the existence of SP cells in 769P cell line. Down-regulation of PKCε also suppresses the CSC potential of sorted 769P SP cells in several ways: proliferation potential, resistance to chemotherapeutics and in vivo tumor formation ability. Our study also reveals that PKCε is associated with ABCB1 and this association probably contributed to the SP cells isolation from 769P cell line. Furthermore, the expression of ABCB1 is directly regulated by PKCε. Additionally, after the depletion of PKCε, the phosphorylation of pAkt, pStat3 and pERK was apparently suppressed in 769P SP cells, whereas PKCε overexpression could promote the phosphorylation of AKT, STAT3 and ERK in 769P Non-SP cells. Overall, PKCε down-regulation suppresses sorting and the cancer stem-like phenotype of RCC 769P SP cells through the regulation of ABCB1 transporter and the PI3K/Akt, Stat3 and MAPK/ERK pathways that are dependent on the phosphorylation effects. Thus, PKCε may work as an important mediator in cancer stem cell pathogenesis of renal cell cancer.

[Effects of electroacupuncture at "Neiguan" (PC 6) on p38 MAPK signaling pathway in rats with cardiac hypertrophy].

OBJECTIVE: To discuss the mechanisms of electroacupuncture at "Neiguan" (PC 6) on p38 MAPK signaling pathway in rats with cardiac hypertrophy. METHODS: Forty SD rats were randomly divided into four groups: a normal group, a model group, a model plus p38 MAPK inhibitor group, a model plus electroacupuncture group, ten rats in each group. The model rats were established by subcutaneous injection 3 mg/(kg x d) of Isoprenaline Hydrochloride; model plus p38 MAPK inhibitor group were injected 0.3 mg/(kg x d) of specific inhibitor SB 203580; model plus electroacupuncture group was treated by electroacupuncture at "Neiguan"(PC 6) with continuous-wave, 2 Hz and 1 mA for 20 minutes, once a day for 14 days. There was no treatment in other two groups. The contents of TNF-alpha and IL-1beta in heart tissue were detected by radioimmunoassay and the p38 MAPK, p-p38 MAPK by western blot. RESULTS: Compared with normal group, the contents of TNF-alpha, IL-1beta, p38 MAPK, p-p38 MAPK were significantly increased in model group (all P < 0.01). The contents of TNFalpha, IL-1beta, p38 MAPK, p-p38 MAPK were significantly decreased in model plus p38 MAPK inhibitor group and model plus electroacupuncture group, compared with model group, all P < 0.05; compared with normal group, P < 0.05, P < 0.01; but no significant difference between model plus p38 MAPK inhibitor group and model plus electroacupuncture group (P > 0.05). CONCLUSION: Electroacupuncture at "Neiguan" (PC 6) can prevent the phosphorylation of p38 MAPK of myocardial hypertrophy, and the mechanism maybe adjust p38 MAPK signaling pathway by inhibiting the expression of TNF-alpha and IL-1beta.

[Influence of electroacupuncture of Guanyuan (GV 4) and Zusanli (ST 36) on the immune function of T cells in aging rats].

OBJECTIVE: To observe the influence of electroacupuncture (EA) on T cell immunologic function in the aged rats so as to reveal its underlying mechanism in anti-aging effect. METHODS: Fifty SD rats (half male and half female) were randomly divided into normal control (young rats), aging model (model), EA group, immunosuppression (IS), and EA+ IS groups. Aging model (in the late 4 groups) was duplicated by subcutaneous injection of D-galactose for 40 days. Guanyuan (CV 4) and bilateral Zusanli (ST 36) were punctured and stimulated electrically (2 Hz, 1 mA), 15 min every time, six times a week and for four weeks. IS model was induced by i. p. i. of cytoxan (60 mg/kg) after 26 and 27 days' EA treatment. Splenetic T lymphocyte proliferation index was assayed by Methylthiazolyldiphenyl-tetrazolium bromide (MTT) chromatometry. IL-2/IL-2 receptor (R) expression level of T cells was measured by enzyme linked immunosorbent assay (ELISA). CD8+ CD28(+) -T cell subset fluorescence intensity was detected by flow cytometry. RESULTS: Compared with normal control group, the splenetic T lymphocyte proliferation index, IL-2 and IL-2R expression levels, and CD8+ CD28(+) -T cell density in model and IS groups decreased significantly (P < 0.01). In comparison with model group, the abovementioned indexes in EA and EA + IS groups increased significantly (P < 0.01), and those indexes levels of EA + IS group were also significantly higher than those in IS group ( P < 0.05, P < 0.01). Comparison between EA and EA+ IS groups showed that CD8+ CD2+ T cell expression of the later group was significantly lower than that in EA group (P < 0 05). No significant differences were found between EA and EA + IS groups in T cell proliferation rate and IL-2 and IL-2R expression levels (P > 0.05) CONCLUSION: EA of CV 4 and ST 36 induced upregulation of T cell proliferation and IL-2/IL-2R, and CD8+ CD(+)28 -T cell may contribute to its antiaging and immuno-enhancement effects in the aged rats.

[Effect of acupuncture on expression of neurology-related genes in the brain tissue of the rat].

OBJECTIVE: To analyze and explore the molecular mechanism of acupuncture precondition (AP) in improving brain ischemia reperfusion injury. METHODS: Six male Wistar rats were divided into a normal group of 3 rats and an acupuncture group of 3 rats. In the acupuncture group, acupuncture precondition was first given at "Shenshu" (BL 23) and "Baihui" (GV 20). The brain of the rat was removed 0.5 hour after the needle was withdrawn, and then gene differential expression was analyzed by genechip method. RESULTS: After acupuncture precondition for 0.5 h, expression of 265 genes showed changes of more than 2 times, and that of 20 genes had a significant difference as compared with that of the normal rat (P<0.05). Among the genes, expression of 8 was upregulated and 12 downregulated; 11 were related with neuron signal conduction (ion channel, transmitter, receptor, second message), 5 with gene transcription and control, 2 with metabolism enzyme, 1 with heat shock reaction and 1 with cell skeleton. CONCLUSION: Some gene expression substances induced by acupuncture play an important role in AP resisting brain ischemia reperfusion injury; and functional changes of neurons after AP are possibly the important basis of its subsequent action in resisting brain ischemia reperfusion injury.