Investigating TrkA expression in canine appendicular osteosarcoma

被引:7
作者
Fan, T. M. [1 ]
Barger, A. M. [2 ]
Sprandel, I. T. [1 ]
Fredrickson, R. L. [2 ]
机构
[1] Univ Illinois, Dept Vet Clin Med, Urbana, IL 61802 USA
[2] Univ Illinois, Dept Pathobiol, Urbana, IL 61802 USA
来源
JOURNAL OF VETERINARY INTERNAL MEDICINE | 2008年 / 22卷 / 05期
关键词
bone and pulmonary metastases; bone sarcoma; cell mitogenesis; cellular survival signals; receptor tyrosine kinase;
D O I
10.1111/j.1939-1676.2008.0151.x
中图分类号
S85 [动物医学(兽医学)];
学科分类号
0906 ;
摘要
Background: The tropomyosin-related kinase A (TrkA) proto-oncogene encodes for a receptor that binds with high affinity to the neurotrophin ligand, nerve growth factor (NGF). Intracellular signaling mediated by the TrkA/NGF axis orchestrates neuronal cell differentiation, mitogenesis, and survival. Interestingly, TrkA also is expressed by bone forming cells, and its signaling promotes antiapoptotic effects in actively dividing osteoblasts. Hypothesis: In canine immortalized cell lines and naturally occurring tumor samples, osteosarcoma (OSA) cells will express TrkA. In canine OSA cell lines, TrkA signaling will promote cell mitogenesis and survival. Methods: In vitro, TrkA expression in canine OSA cell lines was assessed by reverse transcriptase-polymerase chain reaction, flow cytometry, and immunocytochemistry. In vitro, the involvement of TrkA-mediated signaling for cell mitogenesis and survival were investigated with commercially available assays. In vivo, TrkA expression was evaluated in primary tumors and pulmonary metastases with immunocytochemistry and immunohistochemistry, respectively. Results: In vitro, canine OSA cells expressed TrkA mRNA and protein. Ligation of TrkA with exogenous NGF did not induce mitogenesis. Blockade of TrkA signaling with either a protein kinase inhibitor or NGF-neutralizing antibody induced apoptosis of canine OSA cell lines. In vivo, the majority (10/15) of canine OSA primary tumors and pulmonary metastases (9/12) expressed TrkA protein. Conclusions and Clinical Importance: Canine OSA cells express TrkA, and its signaling protects against apoptosis. Most dogs with spontaneously arising OSA express TrkA within their primary tumors and pulmonary metastatic lesions, warranting further investigations with TrkA antagonists as a novel treatment option for canine OSA.
引用
收藏
页码:1181 / 1188
页数:8
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