Abstract
Ablation of the myenteric plexus in mouse colon with the detergent benzalkonium chloride (BAC) is followed by considerable recovery of the nerves, indicating that this plexus is capable of regeneration and has plasticity. Interstitial cells of Cajal (ICC) are closely associated with enteric nerves, and the acquisition and maintenance of their adult phenotype are nerve-dependent. Little is known about the regenerative processes of ICC or about the possible dependence of these processes on neurons. To address these questions, we ablated the myenteric plexus in the mouse colon with BAC and followed changes in the adjacent ICC (ICC-MP) from day 2 to day 70 after treatment, by using c-kit-immunohistochemistry and electron microscopy. In the untreated area, c-kit-positive cells and ICC-MP with normal ultrastructural features were always present. The region partially affected by BAC contained some c-kit-positive cells, and either normal or vacuolated ICC-MP were observed by electron microscopy. Moreover, at days 60–70, ICC-MP with particularly extended rough endoplasmic reticulum were present in this area. In the treated area, either denervated or reinnervated, c-kit-positive cells were always absent. By day 14 after BAC treatment, nerve fibers had started to grow back into the treated region and, in the reinnervated area, cells with fibroblast-like features appeared and were seen to contact both nerve endings and smooth muscle cells and to acquire some typical ICC features. Thus, ICC are vulnerable to external insult but appear to have some ability to regenerate.
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We thank Patrizio Guasti, Daniele Guasti, and Laura Calosi for their expert technical support.
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This work was supported by the US-Israel Binational Science Foundation (BSF, 98-00185; to M.H.) and University funds “quota di ateneo ex 60%” (M.-S. F.-P.).
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Faussone-Pellegrini, MS., Vannucchi, MG., Ledder, O. et al. Plasticity of interstitial cells of Cajal: a study of mouse colon. Cell Tissue Res 325, 211–217 (2006). https://doi.org/10.1007/s00441-006-0174-8
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DOI: https://doi.org/10.1007/s00441-006-0174-8