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. 2020 Oct 7;10:16686. doi: 10.1038/s41598-020-73840-4

Figure 7.

Figure 7

Schematic representation of the proposed putative mechanism of action of NESF and NLP in the regulation of GH synthesis in the mammalian somatotrophs. While the GH-secretagogue ghrelin (GRL) activates the cAMP/PKA/CREB pathway to stimulate the synthesis of GH through a GPCR with a Gα-stimulatory subunit (Gαs), NESF and NLP prevent the activation of this signalling pathway by the adenylyl cyclase stimulator forskolin (FK). However, the phosphorylation of CREB is not compromised when the pathway is directly activated at the level of PKA by the cAMP-analog CPT. These results suggest that exogenous nucleobindin encoded peptides likely exert their effects by the inhibition of the adenylyl cyclase, possibly through a GPCR associated with a Gα-inhibitory subunit (Gαi). Figure created with BioRender.com tools.