Abstract
Congestive heart failure (CHF) is a complex syndrome involving altered neurohormonal levels and impaired cardiac and renal function. In recent years, intravenous administration of exogenous human brain-type natriuretic peptide (hBNP) has become an important therapy in treating patients with acutely decompensated CHF. However, reports during the past year suggest that hBNP could play a prominent role in the chronic treatment of CHF patients as well. We are currently developing conjugates of hBNP suitable for oral delivery to provide a patient-friendly treatment option for chronic heart failure patients. In this report, we present in vitro activity results obtained from hBNP conjugates featuring a variety of rationally designed amphiphilic oligomers. Mapping studies revealed that the hydrophobic/hydrophilic balance of the oligomer impacted the regioselectivity of conjugation. Additionally, the regiochemistry and extent of conjugation had a significant impact on activity. Many monoconjugates retained activity comparable to native peptide and are currently under evaluation in subsequent in vivo screens.
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