期刊
ANALYTICAL AND BIOANALYTICAL CHEMISTRY
卷 407, 期 8, 页码 2107-2116出版社
SPRINGER HEIDELBERG
DOI: 10.1007/s00216-014-8237-2
关键词
Mass spectrometry; MALDI imaging; Drug monitoring/drug screening; Irinotecan; SN-38
资金
- Ministry of Education and Research of the Federal Republic of Germany BMBF [01ZX1310B, 01IB10004E]
- Deutsche Forschungsgemeinschaft [SFB 824 TP Z2, WA 1656/3-1, HO 1258/3-1]
- Helmholtz Zentrum Munchen (TKP-Project)
Tissue distribution and quantitative analysis of small molecules is a key to assess the mechanism of drug action and evaluate treatment efficacy. The prodrug irinotecan (CPT-11) is widely used for chemotherapeutic treatment of colorectal cancer. CPT-11 requires conversion into its active metabolite SN-38 to exert the desired pharmacological effect. MALDI-Fourier transform ion cyclotron resonance (FT-ICR) and MALDI-time-of-flight (TOF) mass spectrometry imaging (MSI) were performed for detection of CPT-11 and SN-38 in tissue sections from mice post CPT-11 injection. In-depth information was gained about the distribution and quantity of drug compounds in normal and tumor tissue. The prodrug was metabolized, as proven by the detection of SN-38 in liver, kidney and digestive tract. In tumors from genetic mouse models for colorectal cancer (Apc (1638N/wt) x pvillin-Kras (V12G) ), CPT-11 was detected but not the active metabolite. In order to correlate drug distribution relative to vascularization, MALDI data were superimposed with CD31 (PECAM-1) immunohistochemistry. This analysis indicated that intratumoral access of CPT-11 mainly occurred by extravasation from microvessels. The present study exploits the power of MALDI MSI in drug analysis, and presents a novel approach to monitor drug distribution in relation to vessel functionality in preclinical and clinical research.
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