Accurate quantification of PGE2 in the polyposis in rat colon (Pirc) model by surrogate analyte-based UPLC-MS/MS. Academic Article uri icon


  • 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.

published proceedings

  • J Pharm Biomed Anal

altmetric score

  • 0.25

author list (cited authors)

  • Yun, C., Dashwood, W., Kwong, L. N., Gao, S., Yin, T., Ling, Q., ... Hu, M.

citation count

  • 7

complete list of authors

  • Yun, Changhong||Dashwood, Wan-Mohaiza||Kwong, Lawrence N||Gao, Song||Yin, Taijun||Ling, Qinglan||Singh, Rashim||Dashwood, Roderick H||Hu, Ming

publication date

  • January 2018