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Non-invasive Assessment of the Efficacy of New Therapeutics for Intestinal Pathologies Using Serial Endoscopic Imaging of Live Mice

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Pointers and pitfalls of mycophenolate-associated colitis.

Stephen Lee¹, W Bastiaan de Boer, Kavitha Subramaniam

¹Department of Anatomical Pathology, PathWest Laboratory Medicine, QE II Medical Centre, Nedlands, Western Australia, Australia. stephenlee.au@gmail.com

Journal of Clinical Pathology

|October 6, 2012

Summary

Mycophenolate mofetil (MMF)-associated colitis presents with mixed injury patterns, including crypt apoptosis and architectural distortion. Pathologists should consider proximal accentuation and dual pathology in transplant patients on MMF.

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Area of Science:

Gastroenterology
Transplant Pathology
Colorectal Histopathology

Background:

Mycophenolate mofetil (MMF) is an immunosuppressant used in transplant patients.
MMF-associated colitis can mimic other colonic diseases, posing diagnostic challenges.
Characterizing MMF-induced mucosal injury is crucial for accurate diagnosis.

Purpose of the Study:

To semiquantitatively characterize the pathological changes in mycophenolate mofetil (MMF) associated mucosal injury.
To identify key histological features distinguishing MMF-associated colitis.

Main Methods:

Retrospective analysis of colonoscopic biopsies from seven transplant patients on MMF.
Semiquantitative evaluation of histological parameters: architectural distortion, cryptitis, stromal inflammation, individual damaged crypts (IDC), and crypt apoptosis.
Assessment of parameters in right and left colon biopsies separately.

Main Results:

All cases exhibited mixed patterns of mucosal injury.
Common findings included architectural distortion, cryptitis, increased crypt apoptosis, and IDC.
Three cases showed features of acute self-limited colitis; three had dual pathology (CMV or IBD).

Conclusions:

MMF-associated colitis shows a spectrum of changes, with mixed injury patterns being key.
Microscopic clues include crypt apoptosis, isolated crypt damage, architectural distortion, and potential proximal accentuation.
Clinical correlation is vital due to dual pathology occurrence in MMF-treated patients.