GH release after GHRP-6 or GHRH + GHRP-6 is fully preserved in patients with microprolactinomas and does not differ before and after treatment with bromocriptine. Patients with macroprolactinoma have blunted responses of GH after GHRH and GHRP-6 and synergism is severely compromised. GH responsiveness to and synergistic interaction between GHRH and GHRP-6 recovers after shrinkage of macroprolactinoma with bromocriptine. Prolactin release stimulated by intravenous administration of GHRP-6 in healthy subjects was not seen in patients with micro- or macroprolactinomas.
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