Long-Term Treatment with Alcaligenes Faecalis A12C Improves Host Resistance to Pathogens in Septic Rats: Possible Contribution of Curdlan-Like Immune Trainer

Overview

Journal Probiotics Antimicrob Proteins

Publisher Springer

Specialties Infectious Diseases
Microbiology
Nutritional Sciences
Pharmacology

Date 2024 Apr 26

PMID 38668821

Authors

C J Martel-Benitez

R Alayon-Afonso

D Padilla Castillo

F J Chamizo-Lopez

M Isabel Garcia-Laorden

A Espinosa de Los Monteros Y Zayas

J C Rivero-Vera

P Nogueira Salgueiro

F Real

A Bordes-Benitez

A Martel Quintana

C Almeida Pena

C Dominguez Cabrera

J M Gonzalez-Martin

J Martin Caballero

R Frias Beneyto

Jesus Villar

J L Martin-Barrasa

Affiliations

Soon will be listed here.

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 pretreated 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 pretreated (SA) (n = 8) groups and 45 rats divided into four groups: healthy (AGUSAN) (n = 9), septic (AGUIC) (n = 13), septic pretreated (AGUIA) (n = 14), and healthy pretreated (AGUSTO) (n = 9). Sepsis was induced by cecal ligation and puncture after 30 days of A. faecalis A12C pretreatment or without. SA group had a higher survival rate of 58% vs. 16% for SC group (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 pretreatment. Fecal concentrations of Escherichia coli significantly decreased in AGUIA and AGUSTO. Bacterial load in urine, peritoneal lavage fluid (PLF), and bronchoalveolar lavage fluid (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.

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