Document Detail

SSTR5 P335L monoclonal antibody differentiates pancreatic neuroendocrine neuroplasms with different SSTR5 genotypes.
MedLine Citation:
PMID:  22136833     Owner:  NLM     Status:  MEDLINE    
BACKGROUND: Somatostatin receptor type 5 (SSTR5) P335L is a hypofunctional, single nucleotide polymorphism of SSTR5 with implications in the diagnostics and therapy of pancreatic neuroendocrine neoplasms. The purpose of this study is to determine whether a SSTR5 P335L-specific monoclonal antibody could sufficiently differentiate pancreatic neuroendocrine neoplasms (PNENs) with different SSTR5 genotypes.
METHODS: Cellular proliferation rate, SSTR5 mRNA level, and SSTR5 protein level were measured by performing MTS assay, a quantitative reverse transcription polymerase chain reaction study, Western blot analysis, and immunohistochemistry, respectively. SSTR5 genotype was determined with the TaqMan SNP Genotyping assay (Applied Biosystems, Foster City, CA).
RESULTS: We found that the SSTR5 analogue RPL-1980 inhibited cellular proliferation of CAPAN-1 cells more than that of PANC-1 cells. Only PANC-1 (TT) cells, but not CAPAN-1 (CC) cells expressed SSTR5 P335L. In 29 white patients with PNENs, 38% had a TT genotype for SSTR5 P335L, 24% had a CC genotype for WT SSTR5, and 38% hada CT genotype for both SSTR5 P335L and WT SSTR5. Immunohistochemistry using SSTR5 P335L monoclonal antibody detected immunostaining signals only from the neuroendocrine specimens with TT and CT genotypes, but not those with CC genotypes.
CONCLUSION: A SSTR5 P335L monoclonal antibody that specifically recognizes SSTR5 P335L but not WT SSTR5 could differentiate PNENs with different SSTR5 genotypes, thereby providing a potential tool for the clinical diagnosis of PNEN.
Guisheng Zhou; Marie-Claude Gingras; Shi-He Liu; Robbi Sanchez; Dean Edwards; David Dawson; Kurt Christensen; Giovanni Paganelli; Richard Gibbs; William Fisher; Francis C Brunicardi
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Publication Detail:
Type:  Journal Article; Research Support, N.I.H., Extramural; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Surgery     Volume:  150     ISSN:  1532-7361     ISO Abbreviation:  Surgery     Publication Date:  2011 Dec 
Date Detail:
Created Date:  2011-12-05     Completed Date:  2012-02-06     Revised Date:  2013-07-19    
Medline Journal Info:
Nlm Unique ID:  0417347     Medline TA:  Surgery     Country:  United States    
Other Details:
Languages:  eng     Pagination:  1136-42     Citation Subset:  AIM; IM    
Copyright Information:
Copyright © 2011 Mosby, Inc. All rights reserved.
Michael E. DeBakey Department of Surgery, Baylor College of Medicine, Houston, TX 77030, USA.
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MeSH Terms
Antibodies, Monoclonal, Murine-Derived / diagnostic use*
Blotting, Western
Cell Line, Tumor
Neuroendocrine Tumors / diagnosis,  genetics*
Pancreatic Neoplasms / diagnosis,  genetics*
Polymorphism, Single Nucleotide
Receptors, Somatostatin / genetics*,  immunology
Reverse Transcriptase Polymerase Chain Reaction
Grant Support
Reg. No./Substance:
0/Antibodies, Monoclonal, Murine-Derived; 0/Receptors, Somatostatin; 0/somatostatin receptor 5

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