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TLR2 and TLR4 interact with sulfide system in the modulation of mouse colonic motility

Artikel i vetenskaplig tidskrift
Författare L. Grasa
L. Abecia
A. Peña-Cearra
S. Robles
Elena Layunta
E. Latorre
J. E. Mesonero
R. Forcén
Publicerad i Neurogastroenterology and Motility
Volym 31
Nummer/häfte 9
ISSN 1350-1925
Publiceringsår 2019
Publicerad vid Institutionen för biomedicin, avdelningen för medicinsk kemi och cellbiologi
Språk en
Länkar dx.doi.org/10.1111/nmo.13648
Ämnesord H2S, intestinal motility, microbiota, Toll-like receptors
Ämneskategorier Medicinsk cellbiologi

Sammanfattning

Background: H2S is a neuromodulator that may inhibit intestinal motility. H2S production in colon is yielded by cystathionine β-synthase (CBS) and cystathionine γ-lyase (CSE) enzymes and sulfate-reducing bacteria (SRB). Toll-like receptors (TLRs) recognize intestinal microbiota. The aim of this work was to evaluate the influence of TLR2 and TLR4 on the endogenous and SRB-mediated synthesis of H2S and its consequences on the colonic motility of mouse. Methods: Muscle contractility studies were performed in colon from WT, Tlr2-/-, and Tlr4-/- mice. The mRNA levels of TLR2, TLR4, CBS, CSE, and SRB were measured by real-time PCR. Free sulfide levels in colon and feces were determined by colorimetric assays. Results: NaHS and GYY4137, donors of H2S, reduced the contractility of colon. Aminooxyacetic acid (AOAA), inhibitor of CBS, and D-L propargylglycine (PAG), inhibitor of CSE, increased the contractility of colon. In vivo treatment with NaHS or GYY4137 inhibited the spontaneous contractions and upregulated TLR2 expression. The in vivo activation of TLR4 with lipopolysaccharide increased the contractile response to PAG, mRNA levels of CSE, and the free sulfide levels of H2S in colon. In Tlr2-/- and Tlr4-/- mice, the contractions induced by AOAA and PAG and mRNA levels of CBS and CSE were lower with respect to WT mice. Deficiency of TLR2 or TLR4 provokes alterations in free sulfide levels and SRB of colon. Conclusions and Inferences: Our study demonstrates interaction between TLR2 and TLR4 and the sulfide system in the regulation of colonic motility and contributes to the pathophysiology knowledge of intestinal motility disorders. © 2019 John Wiley & Sons Ltd

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