Abstract
Background
The pathogenesis of diverticular disease (DD) is considered to be multifactorial and involves intestinal motor disturbances and an underlying enteric neuromuscular pathology. While an enteric neuropathy has been well documented, actual studies on concomitant alterations of the enteric musculature are limited. This study is aimed at reassessing the smooth muscle tissue by histological, ultrastructural and molecular-biological approaches.
Methods
Full-thickness sigmoid specimens were obtained from patients with DD (n = 20) and controls (n = 19). Morphometric analysis was performed to evaluate the thickness and connective tissue index of the circular and longitudinal muscle layers as well as the myenteric plexus. Structural alterations were determined by light and transmission electron microscopy. mRNA profiles of components of the contractile smooth muscle apparatus including smooth muscle α-actin, smoothelin, histone deacetylase 8, and smooth muscle myosin heavy chain (SMMHC) were assessed by qPCR. Altered gene expression levels were confirmed at protein level by immunohistochemistry.
Results
Compared to controls, patients with DD showed (1) increased thickness of the circular and longitudinal muscle layers, (2) architectural alterations of smooth muscle cells, (3) increased connective tissue index of the longitudinal muscle layer, (4) focally reduced density of myofilaments at ultrastructural level, (5) specific down-regulation of SMMHC mRNA levels, (6) decreased immunoreactivity of SMMHC, (7) oligo-neuronal hypoganglionosis.
Conclusions
DD is associated with distinct structural and functional alterations of the enteric musculature. The enteric myopathy is characterized by disturbed muscular architecture, connective tissue replacement and loss of specific myofilaments and thus may contribute to the pathogenesis and progression of DD.
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Abbreviations
- α-SMA:
-
α-Smooth muscle actin
- DD:
-
Diverticular disease
- ENS:
-
Enteric nervous system
- HDAC8:
-
Histone deacetylase 8
- qPCR:
-
Quantitative PCR
- SM:
-
Smoothelin
- SMMHC:
-
Smooth muscle myosin heavy chain
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Acknowledgments
The authors thank Jürgen Hedderich and Oliver Vollrath (Institute of Medical Informatics and Statistics, University Hospital Schleswig–Holstein, Campus Kiel) for statistical advice and Karin Stengel, Inka Geurink, Miriam Lemmer, Frank Lichte, Bettina Facompré and Clemens Franke (Institute of Anatomy, Christian-Albrecht′s University in Kiel) for their excellent technical assistance. The study was supported by a research grant from the German Research Foundation (DFG, WE 2366/4-2) and the Faculty of Medicine, Christian Albrechts University of Kiel (F347022). The funding source has no role in study design, management of data and writing of the paper.
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The authors declare that they have no conflict of interest.
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Ines Hellwig, Martina Böttner authors contributed equally to this study.
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Hellwig, I., Böttner, M., Barrenschee, M. et al. Alterations of the enteric smooth musculature in diverticular disease. J Gastroenterol 49, 1241–1252 (2014). https://doi.org/10.1007/s00535-013-0886-y
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DOI: https://doi.org/10.1007/s00535-013-0886-y