Modified chitosan for effective renal delivery of siRNA to treat acute kidney injury

Weimin Tang, Sudipta Panja, Chinmay M. Jogdeo, Siyuan Tang, Ling Ding, Ao Yu, Kirk W. Foster, Del L. Dsouza, Yashpal S. Chhonker, Heather Jensen-Smith, Hee Seong Jang, Erika I. Boesen, Daryl J. Murry, Babu Padanilam, David Oupický

Research output: Contribution to journalArticlepeer-review

26 Scopus citations


Acute kidney injury (AKI) is characterized by a sudden decrease in renal function and impacts growing number of people worldwide. RNA interference (RNAi) showed potential to treat diseases with no or limited conventional therapies, including AKI. Suitable carriers are needed to protect and selectively deliver RNAi to target cells to fully explore this therapeutic modality. Here, we report on the synthesis of chitosan modified with α-cyclam-p-toluic acid (C-CS) as a novel siRNA carrier for targeted delivery to injured kidneys. We demonstrate that conjugation of the α-cyclam-p-toluic acid to chitosan imparts the C-CS polymer with targeting and antagonistic properties to cells overexpressing chemokine receptor CXCR4. In contrast, the parent α-cyclam-p-toluic acid showed no such properties. Self-assembled C-CS/siRNA nanoparticles rapidly accumulate in the injured kidneys and show long retention in renal tubules. Apoptosis and metabolic and inflammatory pathways induced by p53 are important pathological mechanisms in the development of AKI. Nanoparticles with siRNA against p53 (sip53) were formulated and intravenously injected for attenuation of IRI-AKI. Due to the favorable accumulation in injured kidneys, the treatment with C-CS/sip53 decreased renal injury, extent of renal apoptosis, macrophage and neutrophil infiltration, and improved renal function. Overall, our study suggests that C-CS/siRNA nanoparticles have the potential to effectively accumulate and deliver therapeutic siRNAs to injured kidneys through CXCR4 binding, providing a novel way for AKI therapy.

Original languageEnglish (US)
Article number121562
StatePublished - Jun 2022


  • Acute kidney injury
  • CXCR4
  • Chitosan
  • Ischemia-reperfusion injury
  • Polyplexes
  • p53

ASJC Scopus subject areas

  • Mechanics of Materials
  • Ceramics and Composites
  • Bioengineering
  • Biophysics
  • Biomaterials


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