Affiliation:
1. University Institute of Animal Health and Food Safety
2. Hospital Universitario de Gran Canaria Doctor Negrín
3. Instituto de Salud Carlos III
4. Banco Español de Algas
5. Barcelona Biomedical Research Park
6. Karolinska Institutet
Abstract
Abstract
Curdlan, a β-1,3/1,6-glucan found in Alcaligenes faecalis (A. faecalis) wall, activates innate and humoral immunity. The aim of this study is to evaluate whether pre-treated rats with A.faecalis A12C could prevent sepsis disturbances and identify the immunomodulatory mechanisms involved. Experiments occurred in two stages: a survival study with 16 rats randomly divided into septic (SC) (n = 8) and septic pre-treated (SA) (n = 8) groups; and 45 rats divided into four groups: healthy (AGUSAN) (n = 9), septic (AGUIC) (n = 13), septic pre-treated (AGUIA) (n = 14), and healthy pre-treated (AGUSTO) (n = 9). Sepsis was induced by cecal ligation and puncture after 30 days of A.faecalis A12C pre-treatment or without. SA group had a higher survival rate (58%) vs SC group (16%) (P < 0.05). Overall, AGUIA showed better status than AGUIC (P < 0.01). Higher monocytosis was found in AGUIA and AGUSTO vs AGUIC and AGUSAN, respectively (P < 0.05). A gradual increase in curdlan fecal concentration was observed in AGUIA during pre-treatment. Fecal concentrations of E. coli significantly decreased in AGUIA and AGUSTO. Bacterial load in urine, peritoneal, and bronchoalveolar lavage fluids (PLF and BALF) decreased (P < 0.05) in AGUIA vs AGUIC. Finally, lower inflammation was observed in serum, BALF, and PLF, with reduced IL-6, IL-10, IL-1β, and TNF-α, along with less damage in lungs and peritoneum in AGUIA vs AGUIC. These findings suggest the connection between curdlan -produced by A. faecalis A12C- with the immune system and the reduction in severity of experimental sepsis.
Publisher
Research Square Platform LLC
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