OBJECTIVE: To investigate the stability of epigallocatechin gallate ( EGCG) powder. METHODS: The content of the sample was determined by HPLC, and the factors affecting the stability of EGCG were studied according to the related guideline stated in China Pharmacopeia. RESULTS: The linear range of EGCG was 7. 76～ 77. 6? g? mL- 1( r=0. 999 9) , with average recovery at 101. 29% ( RSD=0. 76% ) . Exposed to strong illumination, high temperature and high humidity, the color of EGCG powder suffered variant degree of change, but its content experienced no marked change, and no new degraded substances was noted. CONCLUSION: EGCG powder had a sound stability.

Objective The aims of this study were to determine the expression of Ki-67 and PTEN in oral adenoid cystic carcinoma( OACC) and its relationship with clinicopathological features,and to explore the re-lationship between the expression of Ki-67 and PTEN. Methods Forty cases of oral adenoid cystic carcinoma were collected from the pathological laboratory in our hospital. Another 15 cases of normal gland in patients with oral adenoid cystic carcinoma were selected as the control group. The expression of Ki-67 protein and PTEN in adenoid cystic carcinoma was detected by immunohistochemistry. Results The positive rate of Ki-67 protein in oral adenoid cystic carcinoma was 70%(28/40),which was significantly higher than that in the control group(2/15)(P<0. 05). The positive rate of PTEN in oral adenoid cystic carcinoma was 63%(25/40),which was signif-icantly higher than that in the control group 20%(3/15)(P <0. 05). They were associated with histological types,metastasis,lymph node metastasis and neural invasion,and not correlated with age,gender and tumor loca-tion. The expression of Ki-67 and PTEN in oral adenoid cystic carcinoma may have a significant correlation. Conclusion The expression of Ki-67 and PTEN in adenoid cystic carcinoma is high,and their occurrence and development in adenoid cystic carcinoma play an important role in the process of evolution and metastasis. Ki-67 and PTEN proteins may be markers of oral adenoid cystic carcinoma.

Objective:To explore the moderating mechanism of mindfulness on perceived stress and job burnout of medical staff.Methods:From November 2020 to March 2022, 1626 medical staff were investigated by questionnaires. Chinese Version Perceived Stress Scale (CPSS), Maslach Burnout Inventory-Human Service Survey (MBI-HSS) and Mindful Attention Awareness Scale (MAAS) were used to evaluate the perceived stress, three dimensions of job burnout[depersonalization (DP), emotional exhaustion (EE), personal accomplishment (PA) ], and mindfulness level of medical staff. The Spearman rank correlation analysis was used to analyze the correlation between mindfulness and perceived stress, job burnout of medical staff. And the SPSS PROCESS macro program was used to test the moderating effect of mindfulness on perceived stress and job burnout.Results:Among the 1626 medical staff, 57.38% had perceived stress with health risk (933/1626), and 63.84% (1038/1626) had job burnout, among them, with 618 (38.01%), 274 (16.85%), and 146 (8.98%) experiencing mild, moderate and severe job burnout, respectively. The scores of mindfulness among medical staff were significantly correlated with perceived stress and various dimensions of job burnout (EE, DP and PA) ( rs=-0.155, -0.351, -0.315, 0.307, P<0.001). Mindfulness had a moderating effect between perceived stress and job burnout, which was achieved through three moderating pathways: perceived stress-mindfulness-EE, perceived stress-mindfulness-DP and perceived stress-mindfulness-PA (Δ R2=0.073, 0.06, 0.006, P<0.001) . Conclusion:Medical staff have a high level of job burnout, mindfulness plays a moderating role between perceived stress and job burnout. Specific measures can be taken to improve the level of mindfulness in medical staff, so as to prevent and alleviate job burnout of medical staff.

Objective:To explore the moderating mechanism of mindfulness on perceived stress and job burnout of medical staff.Methods:From November 2020 to March 2022, 1626 medical staff were investigated by questionnaires. Chinese Version Perceived Stress Scale (CPSS), Maslach Burnout Inventory-Human Service Survey (MBI-HSS) and Mindful Attention Awareness Scale (MAAS) were used to evaluate the perceived stress, three dimensions of job burnout[depersonalization (DP), emotional exhaustion (EE), personal accomplishment (PA) ], and mindfulness level of medical staff. The Spearman rank correlation analysis was used to analyze the correlation between mindfulness and perceived stress, job burnout of medical staff. And the SPSS PROCESS macro program was used to test the moderating effect of mindfulness on perceived stress and job burnout.Results:Among the 1626 medical staff, 57.38% had perceived stress with health risk (933/1626), and 63.84% (1038/1626) had job burnout, among them, with 618 (38.01%), 274 (16.85%), and 146 (8.98%) experiencing mild, moderate and severe job burnout, respectively. The scores of mindfulness among medical staff were significantly correlated with perceived stress and various dimensions of job burnout (EE, DP and PA) ( rs=-0.155, -0.351, -0.315, 0.307, P<0.001). Mindfulness had a moderating effect between perceived stress and job burnout, which was achieved through three moderating pathways: perceived stress-mindfulness-EE, perceived stress-mindfulness-DP and perceived stress-mindfulness-PA (Δ R2=0.073, 0.06, 0.006, P<0.001) . Conclusion:Medical staff have a high level of job burnout, mindfulness plays a moderating role between perceived stress and job burnout. Specific measures can be taken to improve the level of mindfulness in medical staff, so as to prevent and alleviate job burnout of medical staff.

[摘 要] 目的：检测lncRNA DNM3OS在喉鳞状细胞癌（laryngeal squamous cell carcinoma，LSCC）组织和LSCC细胞株中的表达及其临床意义，探讨其对LSCC TU177细胞体外增殖、迁移及侵袭的影响，并分析DNM3OS与EMT的关系。方法：从河北医科大学第四医院生物标本库选取2014年3月至2018年12月收治的68例LSCC患者手术切除的癌及癌旁组织标本，应用qPCR法检测DNM3OS在LSCC组织和细胞株中的表达水平。采用siRNA敲低TU177细胞中DNM3OS的表达，应用MTS、克隆形成及Transwell小室等方法分别检测敲低DNM3OS表达对TU177细胞增殖、迁移和侵袭等生物学行为的影响。应用qPCR和WB法检测转染si-DNM3OS后对EMT标志物上皮钙黏素（E-cadherin）、神经钙黏素（N-cadherin）、波形蛋白（vimentin）、扭曲蛋白（twist）、锌指转录因子2（SNAI2）mRNA和蛋白的变化。结果：LSCC组织中DNM3OS表达水平明显高于癌旁组织（P<0.01），并与患者的TNM分期、淋巴结转移及生存期有关联（P<0.05或P<0.01）。DNM3OS在LSCC细胞株（Hep-2、AMC-HN-8、TU177、TU212及TU686）中均呈现不同程度的高表达（P<0.05或P<0.01），转染si-DNM3OS后TU177细胞中DNM3OS的表达显著降低（P<0.01）。与对照组相比，DNM3OS表达敲低可抑制TU177细胞的体外增殖、迁移和侵袭能力（P<0.05或P<0.01），可上调TU177细胞中E-cadherin的表达而下调N-cadherin、vimentin、twist和SNAI2的表达（均P<0.01）。结论： DNM3OS高表达与LSCC的恶性进展有关，其可能为预测LSCC患者预后的潜在指标；DNM3OS可能通过影响EMT进程促进LSCC细胞的侵袭和转移。