JOURNAL ARTICLE
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Influences of stress hormones on microbial infections.

Stress hormones have been recently suggested to influence the pathogenicity of bacteria significantly. Stress has been identified as part of the factors causing an outbreak of infections in the aquaculture industry. The most studied neuroendocrine hormonal family from a microbial endocrinology perspective is the catecholamine comprising of norepinephrine, epinephrine, and dopamine. It is of importance that catecholamine affects the growth and virulence of bacteria. The influence of stress on bacterial infections is attributed to the ability of catecholamines to suppress the immune system as the mode of action for increased bacterial growth. Catecholamines have increased the growth of bacteria, virulence-associated factors, adhesions, and biofilm formation and consequently influence the outcome of infections by these bacteria in many hosts. The siderophores and the ferric iron transport system plays a vital role in the mechanism by which catecholamines stimulates growth and exposure of genes to stress hormones enhances the expression of genes involved in bacterial virulence. In recent years, it has been discovered that intestinal microflora takes part in bidirectional communication between the gut and brain. The rapidly growing field of microbiome research, understanding the communities of bacteria living within our bodies and the genes they contain is yielding new perspectives. This review reveals catecholamines effects on the growth and virulence of bacteria and the latest trends in microbial endocrinology.

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