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BMC Cancer
Published in: BMC Cancer 1/2006

Open Access 01-12-2006 | Research article

The monoclonal antibody SM5-1 recognizes a fibronectin variant which is widely expressed in melanoma

Authors: Uwe Trefzer, Yingwen Chen, Gunda Herberth, Maja Ann Hofmann, Felix Kiecker, Yajun Guo, Wolfram Sterry

Published in: BMC Cancer | Issue 1/2006

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Abstract

Background

Previously we have generated the monoclonal antibody SM5-1 by using a subtractive immunization protocol of human melanoma. This antibody exhibits a high sensitivity for primary melanomas of 99% (248/250 tested) and for metastatic melanoma of 96% (146/151 tested) in paraffin embedded sections. This reactivity is superior to the one obtained by HMB-45, anti-MelanA or anti-Tyrosinase and is comparable to anti-S100. However, as compared to anti-S100, the antibody SM5-1 is highly specific for melanocytic lesions since 40 different neoplasms were found to be negative for SM5-1 by immunohistochemistry. The antigen recognized by SM5-1 is unknown.

Methods

In order to characterize the antigen recognized by mAb SM5-1, a cDNA library was constructed from the metastatic human melanoma cell line SMMUpos in the Uni-ZAP lambda phage and screened by mAb SM5-1. The cDNA clones identified by this approach were then sequenced and subsequently analyzed.

Results

Sequence analysis of nine independent overlapping clones (length 3100–5600 bp) represent fibronectin cDNA including the ED-A, but not the ED-B region which are produced by alternative splicing. The 89aa splicing variant of the IIICS region was found in 8/9 clones and the 120aa splicing variant in 1/9 clones, both of which are included in the CS1 region of fibronectin being involved in melanoma cell adhesion and spreading.

Conclusion

The molecule recognized by SM5-1 is a melanoma associated FN variant expressed by virtually all primary and metastatic melanomas and may play an important role in melanoma formation and progression. This antibody is therefore not only of value in immunohistochemistry, but potentially also for diagnostic imaging and immunotherapy.
Appendix
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Metadata
Title
The monoclonal antibody SM5-1 recognizes a fibronectin variant which is widely expressed in melanoma
Authors
Uwe Trefzer
Yingwen Chen
Gunda Herberth
Maja Ann Hofmann
Felix Kiecker
Yajun Guo
Wolfram Sterry
Publication date
01-12-2006
Publisher
BioMed Central
Published in
BMC Cancer / Issue 1/2006
Electronic ISSN: 1471-2407
DOI
https://doi.org/10.1186/1471-2407-6-8

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