In Vivo Effects of Mesalazine or E. Coli Nissle 1917 on Microsatellite Instability in Ulcerative Colitis
Overview
Pharmacology
Affiliations
Background: Microsatellite instability (MSI) occurs in chronically inflamed colorectal tissue and may evolve to colitis-associated cancer. In vitro data suggest that mesalazine (5-ASA) improves MSI.
Aim: To analyse the changes in MSI in 156 distal colonic biopsies of 39 patients with ulcerative colitis that had been treated within a randomized, double-blind trial comparing 5-ASA with E. coli Nissle (EcN).
Methods: Two biopsies had been collected before and after 1 year of treatment. MSI testing was performed using a panel of eight markers, including 3 dinucleotide and 5 mononucleotide repeats.
Results: No MSI was observed with any of the mono-repeats, and among dinucleotide repeats, only D5S346 (maps to APC) and D17S250 (p53) were consistently informative. Overall, 31/156 (20%) biopsies displayed MSI. After 1 year, 3/11 patients displayed MSI improvement [change to microsatellite stability (MSS); 1 on 5-ASA, 2 on EcN] at D5S346 and 4/11 showed MSI worsening (change from MSS to MSI; all 5-ASA). For D17S250, the corresponding data were for 3/9 patients (2 on 5-ASA, 1 on EcN) and 2/9 (both on 5-ASA), respectively.
Conclusions: In the set of biopsies taken from patients treated with 1.5 g 5-ASA for 1 year, there was no improvement in the prevalence of MSI in the distal colon.
Zhang H, Shi Y, Lin C, He C, Wang S, Li Q Front Immunol. 2024; 14:1338918.
PMID: 38288125 PMC: 10822953. DOI: 10.3389/fimmu.2023.1338918.
Dubbert S, von Bunau R mSphere. 2021; 6(6):e0085621.
PMID: 34935447 PMC: 8694194. DOI: 10.1128/mSphere.00856-21.
Huang J, Yang Z, Li Y, Chai X, Liang Y, Lin B J Transl Med. 2021; 19(1):356.
PMID: 34407839 PMC: 8371868. DOI: 10.1186/s12967-021-02943-x.
Munakata K, Koi M, Kitajima T, Tseng-Rogenski S, Uemura M, Matsuno H Clin Transl Gastroenterol. 2019; 10(12):e00105.
PMID: 31789935 PMC: 6970556. DOI: 10.14309/ctg.0000000000000105.
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Wassenaar T Eur J Microbiol Immunol (Bp). 2016; 6(3):147-161.
PMID: 27766164 PMC: 5063008. DOI: 10.1556/1886.2016.00029.