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http://dx.doi.org/10.5352/JLS.2016.26.1.101

Correlation between Clinicopathology and Expression of HSP70, BAG1 and Raf-1 in Human Diffuse Type Gastric Carcinoma  

Jung, Sang Bong (Department of Clinical Laboratory Science, Dong-Eui Institute of Technology)
Lee, Hyoun Wook (Department of Pathology, Samsung Changwon Hospital, School of Medicine, Sungkyunkwan University)
Chung, Kyung Tae (Department of Clinical Laboratory Science, Dong-Eui University)
Publication Information
Journal of Life Science / v.26, no.1, 2016 , pp. 101-108 More about this Journal
Abstract
The aim of this study was to evaluate the relationships between the expression of Heat shock protein70 (HSP70), Raf-1 and Bcl-2-associated athanogene-1 (BAG1) protein in diffuse type gastric carcinoma and examine association of HSP70, Raf-1 and BAG1 expression with various clinic-pathological factors and survival. Heat shock protein70 is induced in the cells in response to various stress conditions, including carcinogens. Overexpression of heat shock protein 70 has been observed in many types of cancer. The proto-oncoprotein Raf is pivotal for mitogen-activated protein kinase (MAPK) signaling, and its aberrant activation has been implicated in multiple human cancers. Overexpression of BAG1 protein has been documented in some type of human cancer. BAG1 has been reported to interact with protein involved with a variety of signal pathway, and regulation of cell differentiation, survival and apoptosis. These interaction partners include HSP70 and Raf-1. The percentage of tumors exhibiting HSP70 positivity was significantly in cases of positive lymph node metastasis (64.9%) compared to cases without lymph node metastasis (35.1%, p=0.007). HS70 expression was correlated with pathological N-stage (p=0.006). Expression of BAG1 was detected in the majority of diffuse type gastric carcinoma tissues (71.7%), especially in younger patients (80% vs 52.6%, p=0.035). Furthermore BAG1 expression was correlated with tumor size (p=0.020). Raf-1 expression was found to be significantly associated with tumor size (p=0.005). The result indicate that HSP70 was significantly correlated the progression of diffuse type gastric cancer. Expression of BAG1 and Raf-1 may be used as diagnostic markers for gastric carcinoma.
Keywords
Bag1; gastric cancer; hsp70; Immunohistochemistry; raf-1;
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