Serpinin, an agonist of the protease inhibitor Nexin-1 (PN-1), upregulates PN-1 expression via the cAMP-PKA-Sp1 signaling pathway, facilitating granule biogenesis in endocrine cells. It is employed in research on secretory function regulation [1]. Serpinin selectively targets β-adrenergic receptors, particularly interacting with β1-adrenergic receptors to activate the AC-cAMP-PKA pathway, thereby regulating myocardial systolic and diastolic function. Additionally, pGlu-serpinin upregulates Bcl2 mRNA transcription and provides neuroprotective effects [2].