4.7 Article

Connexin 37, 40, 43 and Pannexin 1 Expression in the Gastric Mucosa of Patients with Systemic Sclerosis

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BIOMEDICINES
卷 11, 期 9, 页码 -

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MDPI
DOI: 10.3390/biomedicines11092487

关键词

connexin 37; connexin 40; connexin 43; pannexin 1; systemic sclerosis; gastric mucosa

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In patients with systemic sclerosis (SSc), protein levels of Cx37 were slightly increased, while levels of Cx40 were significantly decreased in the gastric mucosa. These changes were proportional to SSc severity, particularly in patients with severe diffuse cutaneous SSc. No differences in Cx43 expression were found, which is different from previous associations with fibrosis.
Systemic sclerosis (SSc) is an autoimmune disease characterized by fibrosis of the skin and internal organs. Although its pathogenesis is not fully understood, connexins (Cxs) and pannexins (Panx) could be involved in the process of fibrosis. We analyzed the protein expression of Cx37, Cx40, Cx43, and Panx1 in the gastric mucosa of patients with SSc and healthy volunteers, using immunofluorescence staining. Protein levels of Cx37 were slightly increased, while the levels of Cx40 were significantly decreased in the lamina propria of the gastric mucosa of SSc patients compared to the controls. The changes were proportional to SSc severity, with the most prominent changes found in patients with severe diffuse cutaneous SSc. No differences in Cx43 or Panx1 levels were found between the analyzed groups of samples. The lack of changes in Cx43 expression, which has been previously associated with fibrosis, could be due to the weak expression of Cx43 in the gastric mucosa in general. Further studies on full-thickness gastric biopsies containing muscle layers and animal SSc models are needed to fully elucidate the role of Cxs and Panxs in SSc-associated fibrosis.

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