Sonic Hedgehog Paracrine Signaling Activates Stromal Cells to Promote Perineural Invasion in Pancreatic Cancer

• Published in: Clinical cancer research 2014-08, Vol.20 (16), p.4326-4338
• Main Authors: Li, Xuqi, Wang, Zheng, Ma, Qingyong, Xu, Qinhong, Liu, Han, Duan, Wanxing, Lei, Jianjun, Ma, Jiguang, Wang, Xiu, Lv, Shifang, Han, Liang, Li, Wei, Guo, Jian, Guo, Kun, Zhang, Dong, Wu, Erxi, Xie, Keping
• Format: Article
• Language: English
• Subjects: Animals; Antineoplastic agents; Apoptosis; Biological and medical sciences; Blotting, Western; Cell Cycle; Cell Movement; Cell Proliferation; Female; Gastroenterology. Liver. Pancreas. Abdomen; Hedgehog Proteins - metabolism; Humans; Immunoenzyme Techniques; Liver. Biliary tract. Portal circulation. Exocrine pancreas; Medical sciences; Mice; Mice, Nude; Multiple tumors. Solid tumors. Tumors in childhood (general aspects); Neoplasm Invasiveness; Neoplasm Staging; Pancreas - metabolism; Pancreas - pathology; Pancreatic Neoplasms - metabolism; Pancreatic Neoplasms - mortality; Pancreatic Neoplasms - pathology; Pancreatic Stellate Cells - metabolism; Pancreatic Stellate Cells - pathology; Paracrine Communication; Peripheral Nervous System Neoplasms - metabolism; Peripheral Nervous System Neoplasms - pathology; Pharmacology. Drug treatments; Prognosis; Signal Transduction; Stromal Cells - metabolism; Stromal Cells - pathology; Survival Rate; Tumor Cells, Cultured; Tumors; Xenograft Model Antitumor Assays
• ISSN: 1078-0432; 1557-3265
• DOI: 10.1158/1078-0432.ccr-13-3426

Pancreatic cancer is characterized by stromal desmoplasia and perineural invasion (PNI). We sought to explore the contribution of pancreatic stellate cells (PSC) activated by paracrine Sonic Hedgehog (SHH) in pancreatic cancer PNI and progression. In this study, the expression dynamics of SHH were examined via immunohistochemistry, real-time PCR, and Western blot analysis in a cohort of carcinomatous and nonneoplastic pancreatic tissues and cells. A series of in vivo and in vitro assays was performed to elucidate the contribution of PSCs activated by paracrine SHH signaling in pancreatic cancer PNI and progression. We show that SHH overexpression in tumor cells is involved in PNI in pancreatic cancer and is an important marker of biologic activity of pancreatic cancer. Moreover, the overexpression of SHH in tumor cells activates the hedgehog pathway in PSCs in the stroma instead of activating tumor cells. These activated PSCs are essential for the promotion of pancreatic cancer cell migration along nerve axons and nerve outgrowth to pancreatic cancer cell colonies in an in vitro three-dimensional model of nerve invasion in cancer. Furthermore, the coimplantation of PSCs activated by paracrine SHH induced tumor cell invasion of the trunk and nerve dysfunction along sciatic nerves and also promoted orthotropic xenograft tumor growth, metastasis, and PNI in in vivo models. These results establish that stromal PSCs activated by SHH paracrine signaling in pancreatic cancer cells secrete high levels of PNI-associated molecules to promote PNI in pancreatic cancer.