消化道恶性肿瘤雌孕激素受体与癌胚抗原的相关性研究

利用酶联素和组化法和ABC免疫组化法进行88例消化道恶性肿瘤的雌激素受体(ER)、孕激素受体(PR)和癌胚抗原(CEA)的相关性研究。结果表明:(1)ER、PR水平与组织学分级呈负相关性。(2)低分化腺癌CEA阳性率最高,且淋巴结转移者CEA均为阳性,提示CEA与肿瘤的恶性度呈正相关。因此性激素受体和CEA提供了肿瘤组织不同的生物学信息,同时检测ER、PR及CEA水平对分泌治疗,手术范围及判断预后更有价值。     

Sequential Profiling of Anti-SARS CoV-2 IgG Antibody in Post COVID-19 Patients

Upon SARS CoV-2 infection, humoral immune system triggers production of anti-SARS CoV-2 IgM and IgG antibodies. Currently, antibodies against SARS CoV-2 spike protein receptor binding domain play a central role in disease protection, making them potential target for in vitro diagnostics applications. This study determines the expression level and sustainability of anti-receptor binding domain (RBD) SARS CoV-2 IgG in post COVID-19 patients. Anti-RBD SARS CoV-2 IgG antibodies in patient serum were analysed by standardised indirect ELISA using SARS CoV-2 spike receptor binding domain protein and HRP conjugated anti-human IgG antibody (anti-h IgG). The study was conducted using 35 adult patient samples with confirmed SARS CoV-2 infection. Additionally, correlation between antibody response after each stage and disease symptoms in post COVID-19 patients were studied. Maximum antibody titre was seen at Day 40 and decreased relatively to Day 180 in antibody positive samples when compared with controls. Overall, more IgG antibody expression is observed in patients who suffered from loss of smell and taste at Day 40. 71% of the positive subjects in this study showed high SARS CoV-2 IgG antibody concentration of above 10 ng/mL and 37% showed strong antibody concentration above 20 ng/mL at the peak of seroconversion.     

Interleukin-6 Perpetrator of the COVID-19 Cytokine Storm

COVID-19 has emerged as a global pandemic. It is mainly manifested as pneumonia which may deteriorate into severe respiratory failure. The major hallmark of the disease is the systemic inflammatory immune response characterized by Cytokine Storm (CS). CS is marked by elevated levels of inflammatory cytokines, mainly interleukin-6 (IL-6), IL-8, IL-10, tumour necrosis factor-α (TNF-α) and interferon-γ (IFN-γ). Of these, IL-6 is found to be significantly associated with higher mortality. IL-6 is also a robust marker for predicting disease prognosis and deterioration of clinical profile. In this review, the pivotal role played by IL-6 in the immuno-pathology of COVID-19 has been illustrated. The role of IL-6 as a pleiotropic cytokine executing both pro and anti-inflammatory activities has been reviewed. ADAM 10, a metalloproteinase switches the anti-inflammatory pathway of IL-6 to pro inflammatory hence blocking the action of ADAM 10 could be a new therapeutic strategy to mitigate the proinflammatory action of IL-6. Furthermore, we explore the role of anti-IL6 agents, IL-6 receptor antibodies which were being used for autoimmune diseases but now are being repurposed for the therapy of COVID-19.     

胰岛素受体结构及信号转导机制探讨

受体是细胞膜或细胞内能识别生物活性分子,并与之持异性地结合,从而引起特征性生物效应的一类生物大分子.近年来利用基因工程的方法,确定了胰岛素受体(IR)的结构,并对信号转导机制进行了研究,使受体的结构和功能的研究成为可能.