Exfoliated cells in stool: a source for reverse transcription-PCR-based analysis of biomarkers of gastrointestinal cancer.
Cancer Epidemiol Biomarkers Prev
; 17(2): 455-8, 2008 Feb.
Article
in En
| MEDLINE
| ID: mdl-18268130
ABSTRACT
Because the colonic mucosa is in direct contact with digesta, luminal exposure to potentially carcinogenic or chemopreventive agents may be important in colorectal carcinogenesis, independently of the effects of systemic exposure through the circulation. To date, few biomarkers for luminal exposure have been identified, and isolation of reasonably good quality fecal human RNA remains difficult. In this study, we assessed the yield and quality of RNA extracted from 10 human stool samples after storage with several commercially available preservatives compared with stool samples immediately frozen in liquid nitrogen. This study shows that careful design of primer pairs which amplify a short length of DNA is key to obtaining interpretable and reproducible results. Moreover, the use of commercially available RNA preservation kits enables investigators to collect usable fecal samples from large populations. Of all the preservative methods tested, RNAlater had the best performance in terms of overall quality, quantity, and level of genomic DNA contamination, and thus deserves further investigation.
Full text:
1
Collection:
01-internacional
Database:
MEDLINE
Main subject:
Biomarkers, Tumor
/
Reverse Transcriptase Polymerase Chain Reaction
/
Feces
/
Gastrointestinal Neoplasms
Limits:
Humans
Language:
En
Journal:
Cancer Epidemiol Biomarkers Prev
Journal subject:
BIOQUIMICA
/
EPIDEMIOLOGIA
/
NEOPLASIAS
Year:
2008
Document type:
Article
Affiliation country:
Publication country:
EEUU
/
ESTADOS UNIDOS
/
ESTADOS UNIDOS DA AMERICA
/
EUA
/
UNITED STATES
/
UNITED STATES OF AMERICA
/
US
/
USA