title: Glial cell line-derived neurotrophic factor promotes invasive behaviour in testicular seminoma cells.
abstract: The glial cell line-derived neurotrophic factor (GDNF) has multiple functions that promote cell survival, proliferation and migration in different cell types. The experimental over-expression of GDNF in mouse testis leads to infertility and promotes seminomatous germ cell tumours in older animals, which suggests that deregulation of the GDNF pathway may be implicated in germ cell carcinogenesis. GDNF activates downstream pathways upon binding to its specific co-receptor GDNF family receptor-a 1 (GFRA1). This complex then interacts with Ret and other co-receptors to activate several intracellular signalling cascades. To explore the involvement of the GDNF pathway in the onset and progression of testicular germ cell tumours, we analysed GFRA1 and Ret expression patterns in seminoma samples. We demonstrated, via immunohistochemistry, that GFRA1, but not Ret, is over-expressed in in situ carcinoma (CIS) and in intratubular and invasive seminoma cells compared with normal human germ cells. Functional analysis of the GDNF biological activity was performed on TCam-2 seminoma cell line. Reverse transcription-PCR (RT-PCR) and immunohistochemical analyses demonstrate that TCam-2 cells express both GFRA1 and Ret mRNA, but only GFRA1 was detected at the protein level. In TCam-2 cells, although GDNF is not mitogenic, it is able to induce migration, as demonstrated by a Boyden chamber assay, possibly through the Src and MEK pathways. Moreover, GDNF promotes invasive behaviour, an effect dependent on pericellular protease activity, possibly through the activity of matrix metalloproteinases. GFRA1 over-expression in CIS and seminoma cells, along with the functional analyses in TCam-2 cells, suggests an involvement of the GDNF pathway in the progression of testicular germ cell cancer.
authors.affiliation: Department of Anatomy, Histology, Forensic Medicine and Orthopedic, Section of Histology, Fondazione Pasteur Cenci Bolognetti, Sapienza University of Rome, Rome, Italy.
authors.forename: F
authors.initials: F
authors.lastname: Ferranti
authors.forename: B
authors.initials: B
authors.lastname: Muciaccia
authors.forename: G
authors.initials: G
authors.lastname: Ricci
authors.forename: L
authors.initials: L
authors.lastname: Dovere
authors.forename: R
authors.initials: R
authors.lastname: Canipari
authors.forename: F
authors.initials: F
authors.lastname: Magliocca
authors.forename: M
authors.initials: M
authors.lastname: Stefanini
authors.forename: A
authors.initials: A
authors.lastname: Catizone
authors.forename: E
authors.initials: E
authors.lastname: Vicini
mesh_terms: D000328:Adult; D002278:Carcinoma in Situ / Q000378:metabolism; D045744:Cell Line, Tumor; D051100:Glial Cell Line-Derived Neurotrophic Factor / Q000494:pharmacology; D051097:Glial Cell Line-Derived Neurotrophic Factor Receptors / Q000096:biosynthesis; D006801:Humans; D008297:Male; D008875:Middle Aged; D009361:Neoplasm Invasiveness / Q000503:physiopathology; D051096:Proto-Oncogene Proteins c-ret / Q000096:biosynthesis; D012333:RNA, Messenger / Q000378:metabolism; D018239:Seminoma / Q000378:metabolism / Q000473:pathology*; D013736:Testicular Neoplasms / Q000473:pathology
chemical_list: C494987:GFRA1 protein, human; D051100:Glial Cell Line-Derived Neurotrophic Factor; D051097:Glial Cell Line-Derived Neurotrophic Factor Receptors; D012333:RNA, Messenger; D051096:Proto-Oncogene Proteins c-ret; C099282:RET protein, human