Abstract:
:The distance of nerve invasion is an important prognostic factor in pancreatic cancer. The extracellular matrix (ECM) of nerve, mainly composed of laminin, collagen IV and anchoring fibrils, might affect nerve invasion. However, this relationship has not been demonstrated. Our study aimed at discovering the promoting factor of nerve invasion within the tumoral ECM. An animal model was established to evaluate the distance of nerve invasion in murine sciatic nerves by intraneural injection of 6 human pancreatic cancer cell lines. mRNA expression of laminins and anchoring fibrils was compared to the distance of nerve invasion for each cancer cell line. A target molecule provided the strong association between mRNA expression and the distance of nerve invasion. To evaluate the role of a target molecule in nerve invasion, protein expression and function were examined using an animal model and surgical cases. Cancer cells with high laminin gamma2 mRNA and protein expression in their basement membranes were associated with long nerve invasion. Knockdown of laminin gamma2 in cancer cells significantly shortened nerve invasion in the animal model. In 75 patients with pancreatic cancer, a large distance of nerve invasion was associated with high expression levels of laminin gamma2 mRNA and basement membranous deposition of laminin gamma2 protein. Our results indicate that laminin gamma2 plays an important role in nerve invasion. The measurement of the nerve invasion distance in our mouse nerve invasion model is useful for evaluating the molecular mechanisms of nerve invasion.
journal_name
Int J Cancerjournal_title
International journal of cancerauthors
Mitsunaga S,Fujii S,Ishii G,Kinoshita T,Hasebe T,Aoyagi K,Sasaki H,Ochiai Adoi
10.1002/ijc.25104subject
Has Abstractpub_date
2010-08-15 00:00:00pages
805-19issue
4eissn
0020-7136issn
1097-0215journal_volume
127pub_type
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