Enzymatic Degradation: The Role of DPP-4, Peptidases, and Renal Clearance in Peptide Half-Life

In their native physiological state, human regulatory peptides circulate with fleeting half-lives—often between 90 seconds and 10 minutes. While this rapid turnover is essential for finely tuned hormonal signaling, it presents a substantial challenge for therapeutic translation.

Primary Clearance Mechanisms:

1. 1Dipeptidyl Peptidase-4 (DPP-4):

1. 1Neutral Endopeptidase (Neprilysin / NEP):

1. 1Renal Glomerular Filtration:

Bioengineering Countermeasures:
Modern peptide engineering circumvents these barriers through non-natural amino acid substitutions (e.g. Aib at position 8 in Semaglutide) and lipid acylation to anchor the molecule to circulating albumin.