A proposed model for cortisol effect on growth and immune suppression in trout liver.

Abstract

<p>Stressed levels of cortisol elevate SOCS transcript levels and reduce GH signaling and the corresponding IGF-1 expression in rainbow trout liver by preventing STAT5 phosphorylation and decreasing total JAK2 protein expression. The cortisol-induced upregulation of SOCS may be playing a role in the suppression of LPS-induced IL-6 expression (a cytokine signaling through the JAK/STAT pathway). Immune challenge with LPS may indirectly inhibit GH signaling by elevating plasma cortisol levels or directly inhibit GH signaling and the corresponding IGF-1 expression by downregulating growth hormone receptors 1 and 2 and by preventing STAT5 phosphorylation.</p

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