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New nanomedicine resolves inflammation, promotes tissue healing
Date:3/19/2013

Ac2-26, which is derived from a naturally occurring protein mediator of inflammation resolution called annexin A1. Second, rather than simply inject the "naked" peptide into injured mice, they packaged the peptide into nanoparticles, designed by the BWH group, that are able to target drugs to sites of tissue injury. The nanoparticles were given this ability through the addition of two components: one that gives them stealthlike properties, enabling them to avoid detection and clearance by white blood cells and the liver; and a second that gives them the ability to target collagen IV, a protein found at sites of tissue injury.

Each nanoparticle is less than 100 nanometers in diameter, or 1/100,000th the diameter of a human hair.

The nanoparticles were tested in mice with peritonitis (inflammation of the peritoneum, the thin tissue that lines the inner wall of the abdomen) or hind-limb ischemia-reperfusion injury (tissue damage caused when blood supply returns to tissue after a period of ischemia, or lack of oxygen). In the mice with peritonitis, intravenous administration of the Ac2-26-containing nanoparticles was significantly more effective at limiting recruitment of neutrophils (a type of inflammatory white blood cell) and at increasing the resolution of inflammation than was intravenous administration of naked Ac2-26. In mice with reperfusion injury, the nanoparticles reduced tissue damage in comparison with either of two types of control nanoparticles: those with a peptide in which the 24 amino acids were scrambled to render it biologically inactive and Ac2-26 nanoparticles without the collagen IV-targeting component.

"These targeted polymeric nanoparticles are capable at very small doses of stopping neutrophils, the most abundant form of white blood cells, from infiltrating sites of disease or injury," said co-lead author Nazila Kamaly, PhD, a postdoctoral fellow at BWH. "This action stops the neutrophils from secreting further si
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Contact: Karin Eskenazi
ket2116@columbia.edu
212-342-0508
Columbia University Medical Center
Source:Eurekalert

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