Adipose Tissue Targeting Ultra‐Small Hybrid Nanoparticles for Synergistic Photodynamic Therapy and Browning Induction in Obesity Treatment

Abstract Photodynamic therapy (PDT), as a means of locally and rapidly inducing adipocyte death via light illumination, in combination with adipose browning induction, a more gradual and widespread effect that could transform white adipose tissue into thermogenic adipose tissue, manifests a promising approach to combat obesity. Herein, adipose‐targeting ultra‐small hybrid nanoparticles (Pep‐PPIX‐Baic NPs) composed of an adipose‐targeting peptide, Fe 3+ , a photosensitizer (protoporphyrin IX), and a browning agent (baicalin) are introduced. Pep‐PPIX‐Baic NPs have been designed to simultaneously enhance the photodynamic effect and induce browning. After intravenous injection in obese mice, the hybrid nanoparticles can specifically accumulate in white adipose tissues, especially those rich in blood supply, and drive adipose reduction owing to the synergy of the PDT effect and baicalin browning induction. Overall, Pep‐PPIX‐Baic NPs exhibited superior anti‐obesity potential through PDT synergistic with adipose browning induction. The designed multifunctional adipose‐targeting hybrid nanoparticles present a prospective nanoplatform for obesity treatment.