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Updated: Sep 7, 2026
A Methodological Approach to Non-invasive Assessments of Vascular Function and Morphology
Published on: February 7, 2015
Crohn's disease: in defense of a microvascular aetiology
Michelle Thornton1, Michael J Solomon
1Department of Colorectal Surgery, Royal Prince Alfred Hospital, Newton, Australia.
Insights
Microvascular ischemia in Crohn's disease may stem from factors like increased platelet aggregation and inflammatory markers. These pathological processes appear to precede the characteristic mucosal inflammation in Crohn's disease.
Area of Science:
- Gastroenterology
- Vascular Biology
- Immunology
Background:
- Crohn's disease is associated with reduced blood vessel number and volume in affected bowel segments.
- The precise cause of microvascular ischemia in Crohn's disease remains undetermined.
- Several disease-specific and general factors are implicated in the pathophysiology.
Purpose of the Study:
- To investigate potential etiological factors contributing to microvascular ischemia in Crohn's disease.
- To explore the role of platelet activation and inflammatory markers in disease development.
Main Methods:
- Analysis of platelet aggregation and surface marker expression (P-selectin, GP53).
- Assessment of inflammatory mediators, including endothelin-1, interleukins, TNF-alpha, PAF, and thrombomodulin.
- Evaluation of cellular adhesion molecule expression.
Main Results:
- Increased mesenteric platelet aggregation and P-selectin/GP53 expression suggest a disease-specific role.
- Elevated levels of endothelin-1, TNF-alpha, PAF, and thrombomodulin are observed, though disease specificity is under investigation.
- Altered cellular adhesion molecule expression is also noted.
Conclusions:
- The findings support the involvement of multiple factors, potentially acting in concert, in the development of microvascular ischemia.
- Microvascular ischemia is proposed as a pathological process that may precede the classic mucosal changes seen in Crohn's disease.
- Establishing direct causality is challenging due to the complex interplay of inflammatory and coagulation cascades.
Background And Aims:
There appears little doubt that microvascular ischaemia is involved in Crohn's disease. Studies have consistently demonstrated that the number of blood vessels and the total volume of blood feeding segments of bowel with Crohn's disease are reduced. However, the aetiology of the microvascular ischaemia is yet to be determined. Potential aetiological factors that appear to be disease specific include increased mesenteric platelet aggregation and increased platelet surface expression of P-selectin and GP53. However, there are several other factors known to be raised in active and quiescent disease for which disease specificity is not yet known, including increased submucosal endothelial endothelin-1 receptor expression, increased m RNA expression for several interleukins and cytokines including TNFalpha, increased PAF and thrombomodulin and finally altered cellular adhesion molecule expression.
Conclusion:
Proving cause and effect will always be a difficult task given the self-perpetuating nature of the inflammatory and coagulation cascades and our inability at present to identify persons who subsequently develop Crohn's disease at a point prior to mucosal inflammation. Results to date however, are supportive of each of these factors, alone or in combination playing an integral part in the development of microvascular ischaemia, a pathological process which appears to precede the classic changes which characterize Crohn's disease.
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