Nanoparticles target anti-inflammatory drugs where needed

Nanoparticles target anti-inflammatory drugs where needed

A system for precisely delivering anti-inflammatory drugs to immune cells gone out of control, has been developed that spares the well-behaved counterpart cells in the body. The system uses nanoparticles made of tiny bits of protein designed to bind to unique receptors found only on neutrophils, a type of immune cell engaged in detrimental acute and chronic inflammatory responses. In chronic inflammation, neutrophils can pile up at the site of injury, sticking to the blood vessel walls and to each other and contributing to tissue damage.

via Top Health News — ScienceDaily:

Researchers at the University of Illinois at Chicago have developed a system for precisely delivering anti-inflammatory drugs to immune cells gone out of control, while sparing their well-behaved counterparts. Their findings were published online Feb. 23 in Nature Nanotechnology.The system uses nanoparticles made of tiny bits of protein designed to bind to unique receptors found only on neutrophils, a type of immune cell engaged in detrimental acute and chronic inflammatory responses.In a normal immune response, neutrophils circulating in the blood respond to signals given off by injured or damaged blood vessels and begin to accumulate at the injury, where they engulf bacteria or debris from injured tissue that might cause infection. In chronic inflammation, neutrophils can pile up at the site of injury, sticking to the blood vessel walls and to each other and contributing to tissue damage.Adhesion of neutrophils to blood vessel walls is a major factor in acute lung injury, where it can impair the exchange of gases between the lungs and blood, leading to severe breathing problems. If untreated, the disease has a 50 percent mortality rate in intensive care units.Corticosteroids and non-steroidal anti-inflammatory drugs used to treat inflammatory diseases are “blunt instruments that affect the whole body and carry some significant side effects,” says Asrar B. Malik, the Schweppe Family Distinguished Professor and head of pharmacology in the UIC College of Medicine, who is lead author of the paper.Neutrophils that are stuck to blood vessels or clumped together have unique receptors on their surface that circulating neutrophils lack. Malik and his colleagues designed a nanoparticle to take advantage by embedding it with an anti-inflammatory drug. The nanoparticles bind to the receptors, and the neutrophils internalize the nanoparticle. Once inside, the anti-inflammatory drug works to “unzip” the neutrophil and allow it to re-enter the bloodstream.”The nanoparticle is very much like a Trojan horse,” Malik said. “It binds to a receptor found only on these activated, sticky neutrophils, and the cell automatically engulfs whatever binds there. …

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Top Health News — ScienceDaily

Nanoparticles target anti-inflammatory drugs where needed

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