beta-2 agonists will effect (inhibit) GH release. Here's a chart showing (in both the human and the rodent), the various neuropeptides and neurotransmitters which contribute to secretion or inhibition of GH release:
Summary representation of the putative roles of the principal neuropeptides and neurotransmitters that supervise GH secretion via GHRH or somatostatin (SS) or by acting directly on the pituitary gland (GH) in the rat (panel A) or human (panel B). Asterisks denote that two or more loci of action are recognized. Not shown are numerous other metabolic and hormonal effectors that also act via multiple pathways, e.g., IGF-I, sex steroids, age, glucocorticoids, diabetes mellitus, obesity, T4, etc. (see text). An unproven role for a putative (as yet unidentified) GHRP-like endogenous ligand is also noted, given that receptors for GHRP ligands are expressed in the hypothalamus and pituitary gland. Table 4 gives some further species distinctions among the rat, sheep, and human.
p.s. AR worked this out :bigsmile don't give me credit