Biomolecular Condensates Based on Amino Acid for Enhancing Oral Bioavailability and Therapeutic Efficacy of Hydrophobic Drugs

Abstract

The oral administration of chemo- or immunotherapeutic drugs presents a compelling alternative for patients with malignant colorectal cancer, offering a convenient and patient-compliant “hospital-free” strategy. Unfortunately, the hydrophobic nature of many drug candidates, alongside the harsh conditions of the gastrointestinal tract, frequently results in suboptimal bioavailability and heightened systemic toxicity. To address these challenges, we harnessed the unique properties of biomolecular condensates, which form through a liquid–liquid phase separation mechanism, to develop a versatile platform for drug encapsulation and delivery. In this study, we introduce a reliable and effective amorphous oral drug delivery system based on biomolecular condensates derived from the amino acid derivative N-(benzyloxycarbonyl)-l-proline (ZP). These ZP condensates exhibit dynamic intermolecular interactions and possess unique physicochemical attributes such as fluidity and viscoelasticity. They significantly improve the solubility of hydrophobic drugs, ensuring enhanced stability and optimized pharmacokinetics under physiological and gastrointestinal conditions. By maintaining drugs in an amorphous state, we substantially increased drug bioavailability and markedly improved pharmacokinetics. Furthermore, the ZP condensates demonstrate potential as an integrated therapeutic platform capable of potentiating the synergies between chemotherapy and immunotherapy while concurrently reducing systemic toxicity. This has resulted in a significant enhancement of chemo-immunotherapy efficacy in the treatment of colorectal cancer, representing a notable advancement in drug delivery and oncology.