Laminin-gamma2 overexpression in head-and-neck squamous cell carcinoma.

Abstract:

:To identify molecular markers for the progression of head-and-neck squamous cell carcinoma (HNSCC), we used RNA arbitrarily primed (RAP) PCR to determine the qualitative and quantitative differences in gene expression between normal epithelial cells, those derived from dysplastic oral mucosa and invasive and metastatic HNSCC. Three differentially expressed DNA fragments (RAP20, RAP21, RAP26) that were upregulated in a tumor cell line (T45) were identified as being regions of the gamma2 subunit of human laminin-5. Northern blot analysis of total cellular RNA revealed overexpression of these transcripts in 6 of 7 HNSCC cell lines compared with normal epidermal keratinocytes. In contrast, no differences were observed in HeLa (cervical carcinoma) or HCT116 (colon carcinoma) cells. Immunostaining of HNSCC cells derived from primary (HN4) and metastatic (HN12) tumors indicated elevated levels of endogenous laminin-gamma2 protein. Furthermore, HNSCC tissues demonstrated strong laminin-gamma2 staining, particularly in the peripheral basaloid cells of tumor islands at the invasion front. In contrast, only minimal staining of laminin-gamma2 was detected in basal cells of the normal epithelium. The data indicate that laminin-gamma2 is frequently overexpressed in HNSCCs and derivative cell lines and that its overexpression is likely to be useful as a marker of head-and-neck squamous malignancy.

journal_name

Int J Cancer

authors

Patel V,Aldridge K,Ensley JF,Odell E,Boyd A,Jones J,Gutkind JS,Yeudall WA

doi

10.1002/ijc.10403

keywords:

subject

Has Abstract

pub_date

2002-06-01 00:00:00

pages

583-8

issue

4

eissn

0020-7136

issn

1097-0215

journal_volume

99

pub_type

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