TY - JOUR
T1 - Accurate quantification of PGE2 in the polyposis in rat colon (Pirc) model by surrogate analyte-based UPLC–MS/MS
AU - Yun, Changhong
AU - Dashwood, Wan Mohaiza
AU - Kwong, Lawrence N.
AU - Gao, Song
AU - Yin, Taijun
AU - Ling, Qinglan
AU - Singh, Rashim
AU - Dashwood, Roderick H.
AU - Hu, Ming
N1 - Funding Information:
The work is supported by a NIGMS grant (GM-070737) to MH.R. Dashwood is supported by NCI grants CA122959 and HHSN26100004. We are also gratitude for the suggestion of Dr. Praveen Rajendran (Center for Epigenetics & Disease Prevention) on the animal experiment.
Publisher Copyright:
© 2017 Elsevier B.V.
PY - 2018/1/30
Y1 - 2018/1/30
N2 - An accurate and reliable UPLC–MS/MS method is reported for the quantification of endogenous Prostaglandin E2 (PGE2) in rat colonic mucosa and polyps. This method adopted the “surrogate analyte plus authentic bio-matrix” approach, using two different stable isotopic labeled analogs — PGE2-d9 as the surrogate analyte and PGE2-d4 as the internal standard. A quantitative standard curve was constructed with the surrogate analyte in colonic mucosa homogenate, and the method was successfully validated with the authentic bio-matrix. Concentrations of endogenous PGE2 in both normal and inflammatory tissue homogenates were back-calculated based on the regression equation. Because of no endogenous interference on the surrogate analyte determination, the specificity was particularly good. By using authentic bio-matrix for validation, the matrix effect and exaction recovery are identically same for the quantitative standard curve and actual samples – this notably increased the assay accuracy. The method is easy, fast, robust and reliable for colon PGE2 determination. This “surrogate analyte” approach was applied to measure the Pirc (an Apc-mutant rat kindred that models human FAP) mucosa and polyps PGE2, one of the strong biomarkers of colorectal cancer. A similar concept could be applied to endogenous biomarkers in other tissues.
AB - An accurate and reliable UPLC–MS/MS method is reported for the quantification of endogenous Prostaglandin E2 (PGE2) in rat colonic mucosa and polyps. This method adopted the “surrogate analyte plus authentic bio-matrix” approach, using two different stable isotopic labeled analogs — PGE2-d9 as the surrogate analyte and PGE2-d4 as the internal standard. A quantitative standard curve was constructed with the surrogate analyte in colonic mucosa homogenate, and the method was successfully validated with the authentic bio-matrix. Concentrations of endogenous PGE2 in both normal and inflammatory tissue homogenates were back-calculated based on the regression equation. Because of no endogenous interference on the surrogate analyte determination, the specificity was particularly good. By using authentic bio-matrix for validation, the matrix effect and exaction recovery are identically same for the quantitative standard curve and actual samples – this notably increased the assay accuracy. The method is easy, fast, robust and reliable for colon PGE2 determination. This “surrogate analyte” approach was applied to measure the Pirc (an Apc-mutant rat kindred that models human FAP) mucosa and polyps PGE2, one of the strong biomarkers of colorectal cancer. A similar concept could be applied to endogenous biomarkers in other tissues.
KW - COX-2
KW - CRC
KW - Colon
KW - Endogenous biomarker
KW - FAP
KW - PGE
KW - Pirc rat
KW - UPLC–MS/MS
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U2 - 10.1016/j.jpba.2017.07.025
DO - 10.1016/j.jpba.2017.07.025
M3 - Article
C2 - 28957718
AN - SCOPUS:85029794334
SN - 0731-7085
VL - 148
SP - 42
EP - 50
JO - Journal of Pharmaceutical and Biomedical Analysis
JF - Journal of Pharmaceutical and Biomedical Analysis
ER -