title: The effects of Hsp90 expression alteration on spinal metastases of breast carcinoma.
abstract: Previous studies have demonstrated that Hsp90 is closely associated with tumor metastases, and inhibition of Hsp90 expression can result in reduced tumor invasiveness and migration capability. However, its role in spinal metastases of breast carcinoma remains unknown. The paper aimed to further detect Hsp90 expression in a mouse model of spinal metastases of breast carcinoma which was established by left ventricular injection of breast cancer cell lines TM40D to nude mice. The BALB/c nude mice were divided into four groups at random: blank control group (n=10), model group (n=30), negative control group (n=10), and experimental group (n=30). Mice in the experimental group were given intraperitoneal injection of 12 mg/kg 17-allylamino-demethoxy geldanamycin (17-AAG), an inhibitor for Hsp90. The protein and mRNA expressions of Hsp90 were respectively determined using immunohistochemistry and real-time PCR. Bioluminescence imaging, dissection, and hematoxylin and eosin staining were performed to observe tumor formation and bone damage. Our results suggested that Hsp90 expression in mice with breast cancer metastasis in the spine was significantly higher than that in normal mice. Furthermore, Hsp90 expression was decreased and the spinal metastasis from breast cancer was inhibited by 17-AAG application. Hsp90 could be considered as an indicator to forecast tumor metastasis and provide a target for the treatment of spinal metastasis of breast cancer.
authors: Spine Tumor Center, Department of Orthopedics, Changzheng Hospital Affiliated the Second Military Medical University, No. 415 Fengyang Road, Shanghai, 200003, China. wangjunyanwjy@hotmail.com
authors: Wangjun
authors: W
authors: Yan
authors: Jianru
authors: J
authors: Xiao
authors: Tielong
authors: T
authors: Liu
authors: Wending
authors: W
authors: Huang
authors: Xinghai
authors: X
authors: Yang
authors: Zhipeng
authors: Z
authors: Wu
authors: Quan
authors: Q
authors: Huang
authors: Ming
authors: M
authors: Qian
mesh_terms: D000818:Animals; D017209:Apoptosis / Q000187:drug effects; D016227:Benzoquinones / Q000494:pharmacology*; D015153:Blotting, Western; D001943:Breast Neoplasms / Q000188:drug therapy / Q000378:metabolism / Q000473:pathology*; D049109:Cell Proliferation / Q000187:drug effects; D005260:Female; D018841:HSP90 Heat-Shock Proteins / Q000037:antagonists & inhibitors* / Q000235:genetics / Q000378:metabolism; D006801:Humans; D047029:Lactams, Macrocyclic / Q000494:pharmacology*; D051379:Mice; D008807:Mice, Inbred BALB C; D008819:Mice, Nude; D012333:RNA, Messenger / Q000235:genetics; D060888:Real-Time Polymerase Chain Reaction; D020133:Reverse Transcriptase Polymerase Chain Reaction; D013125:Spinal Neoplasms / Q000188:drug therapy / Q000378:metabolism / Q000556:secondary*; D014407:Tumor Cells, Cultured; D023041:Xenograft Model Antitumor Assays
chemical_list: D016227:Benzoquinones; D018841:HSP90 Heat-Shock Proteins; D047029:Lactams, Macrocyclic; D012333:RNA, Messenger; C112765:tanespimycin