Abstract
Background
The murine model of high fat diet (HFD)-induced obesity is characterized by an increment of intestinal permeability, secondary to an impairment of mucosal epithelial barrier and enteric inflammation, followed by morphofunctional rearrangement of the enteric nervous system. The present study investigated the involvement of abdominal macrophages in the mechanisms underlying the development of enteric dysmotility associated with obesity.
Methods
Wild type C57BL/6J mice were fed with HFD (60% kcal from fat) or normocaloric diet (NCD, 18% kcal from fat) for 8 weeks. Groups of mice fed with NCD or HFD were treated with clodronate encapsulated into liposomes to deplete abdominal macrophages. Tachykininergic contractions, elicited by electrical stimulation or exogenous substance P (SP), were recorded in vitro from longitudinal muscle colonic preparations. Substance P distribution was examined by confocal immunohistochemistry. The density of macrophages in the colonic wall was examined by immunohistochemical analysis. Malondialdehyde (MDA, colorimetric assay) and IL-1β (ELISA assay) levels were also evaluated.
Results
MDA and IL-1β levels were increased in colonic tissues from HFD-treated animals. In colonic preparations, electrically evoked tachykininergic contractions were enhanced in HFD mice. Immunohistochemistry displayed an increase in substance P immunoreactivity in myenteric ganglia, as well as in the muscular layers of colonic cryosections from obese mice. Macrophage depletion in HFD mice was associated with a significant reduction of colonic inflammation. In addition, the decrease in macrophage density attenuated the morphofunctional alterations of tachykininergic pathways observed in obese mice.
Conclusion
Obesity elicited by HFD determines a condition of colonic inflammation, followed by a marked rearrangement of motor excitatory tachykininergic enteric nerves. Macrophage depletion counteracted the morphofunctional changes of colonic neuromuscular compartment, suggesting a critical role for these immune cells in the onset of enteric dysmotility associated with obesity.
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Author contributions
LA, RC, MF, CP, GH and CB designed the study, DG, MCG, VC, GO, NB, CSe, CI, BC, and ZHN collected and analyzed data, LA, RC, MF, CSc, CP, GH, and CB wrote the manuscript. All authors discussed the results and commented on the manuscript.
Funding
This work was supported by PRA_2016_20 granted by the University of Pisa and by the supported by U.S. National Institutes of Health (NIH) NIH 1R01DK113790 grant. The present work was funded by University of Padova (Italy) PRID 2016 to R.C, by University of Padova (Italy) Assegno di Ricerca 2016 and by San Camillo Hospital, Treviso (Italy) Grant 2015 to M.C.G.
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Antonioli, L., Caputi, V., Fornai, M. et al. Interplay between colonic inflammation and tachykininergic pathways in the onset of colonic dysmotility in a mouse model of diet-induced obesity. Int J Obes 43, 331–343 (2019). https://doi.org/10.1038/s41366-018-0166-2
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DOI: https://doi.org/10.1038/s41366-018-0166-2