Objective： Midkine （MK）, a new member of the heparin-binding growth factor family, has been found recently to have a high expression level in many tumor specimens including lung carcinoma. Estrogens may be involved...Objective： Midkine （MK）, a new member of the heparin-binding growth factor family, has been found recently to have a high expression level in many tumor specimens including lung carcinoma. Estrogens may be involved in lung carcinogenesis, and estrogen receptors, mainly estrogen receptor-β （ER-β）, are present and functional in normal lung and tumor cell lines and tissues. In addition, estrogens and growth factors may promote the progression of human non-small cell lung cancer （NSCLC）. Previously, we have immunohistochemically demonstrated that MK and ER-β proteins were overexpressed in NSCLC and their expression levels were both significantly negatively correlated with the pathological classification. The purpose of this study was to further verify their expression and its correlation with NSCLC. Methods： Taking NSCLC tissues and their corresponding paraneoplastic and normal lung as research objects, we further examined the expression of MK and ER-β by meas of RT-PCR, in situ hybridization and Western blot analyses at the levels of messenger RNA （mRNA） and protein, respectively. Results： The increased MK and ER-β mRNA expression was found in NSCLC by RT-PCR and in situ hybridization analyses. Furthermore, Western blot analysis also displayed increased expression of MK and ER-β proteins in NSCLC. Finally, their correlation analysis at the levels of mRNA and protein expression in NSCLC demonstrated that MK protein level was significantly correlated to estrogen receptor-β （P〈0.01, rs=0.535）; in spite of their correlation at the mRNA level, there was no remarkable difference between MK and ER-β （P〉0.05, rs=0.178）. Conclusion： All these results in the present study confirmed that MK and ER-β were overexpressed in human NSCLC.展开更多
In recent years, lung cancer has been the most commonly diagnosed cancer globally; 1.6 million people died of lung cancer in 2012 globally, making lung cancer the leading cause of cancer-related deaths.1,2 Lung cancer...In recent years, lung cancer has been the most commonly diagnosed cancer globally; 1.6 million people died of lung cancer in 2012 globally, making lung cancer the leading cause of cancer-related deaths.1,2 Lung cancer can be mainly histologically classified into two types: non-small-cell lung cancer (NSCLC) and small-cell lung cancer (SCLC), ac-counting for approximately 85% and 15% of cases, respectively.3 NSCLC can be further classified as squamous cell carcinoma, adenocarcinoma, and large-cell lung carcinoma, among which lung adenocarci-noma is the most common primary malignant tumor. Unfortunately, most NSCLC cases are diagnosed at a late stage when the survival rate is low; the 5-year survival rate is approximately 16%.展开更多
基金supported by a grant from General Program of the National Natural Science Foundation of China(No.30872941)the Scientific Research Foundation of Graduate School of Nanjing University(2008CL06)
文摘Objective： Midkine （MK）, a new member of the heparin-binding growth factor family, has been found recently to have a high expression level in many tumor specimens including lung carcinoma. Estrogens may be involved in lung carcinogenesis, and estrogen receptors, mainly estrogen receptor-β （ER-β）, are present and functional in normal lung and tumor cell lines and tissues. In addition, estrogens and growth factors may promote the progression of human non-small cell lung cancer （NSCLC）. Previously, we have immunohistochemically demonstrated that MK and ER-β proteins were overexpressed in NSCLC and their expression levels were both significantly negatively correlated with the pathological classification. The purpose of this study was to further verify their expression and its correlation with NSCLC. Methods： Taking NSCLC tissues and their corresponding paraneoplastic and normal lung as research objects, we further examined the expression of MK and ER-β by meas of RT-PCR, in situ hybridization and Western blot analyses at the levels of messenger RNA （mRNA） and protein, respectively. Results： The increased MK and ER-β mRNA expression was found in NSCLC by RT-PCR and in situ hybridization analyses. Furthermore, Western blot analysis also displayed increased expression of MK and ER-β proteins in NSCLC. Finally, their correlation analysis at the levels of mRNA and protein expression in NSCLC demonstrated that MK protein level was significantly correlated to estrogen receptor-β （P〈0.01, rs=0.535）; in spite of their correlation at the mRNA level, there was no remarkable difference between MK and ER-β （P〉0.05, rs=0.178）. Conclusion： All these results in the present study confirmed that MK and ER-β were overexpressed in human NSCLC.
文摘In recent years, lung cancer has been the most commonly diagnosed cancer globally; 1.6 million people died of lung cancer in 2012 globally, making lung cancer the leading cause of cancer-related deaths.1,2 Lung cancer can be mainly histologically classified into two types: non-small-cell lung cancer (NSCLC) and small-cell lung cancer (SCLC), ac-counting for approximately 85% and 15% of cases, respectively.3 NSCLC can be further classified as squamous cell carcinoma, adenocarcinoma, and large-cell lung carcinoma, among which lung adenocarci-noma is the most common primary malignant tumor. Unfortunately, most NSCLC cases are diagnosed at a late stage when the survival rate is low; the 5-year survival rate is approximately 16%.
