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Arthritis News

Flare-responsive hydrogel developed to treat arthritis

April 11, 2018 By Namita Nayyar (WF Team)

Flare-responsive hydrogel

“Arthritis represents a huge unmet clinical need,” said co-senior author Jeff Karp, PhD, a bioengineer and principal investigator at BWH. “Although new therapeutics have been developed, many have had systemic, toxic effects. We wanted to design a delivery system that could be efficient, deliver drugs locally and release drugs in response to inflammation.”

The newly created flare-responsive hydrogel is made from triglycerol monostearate (TG-18), a compound from the Food and Drug Administration’s list of “generally recognized as safe” compounds. TG-18 is a molecule capable of self-assembling, meaning that it can form a gel-like structure comprising fibers. This structure can be easily injected as a suspension In this study, the TG-18 hydrogel was loaded with triamcinolone acetonide (TA) used here as a model drug, but could potentially be loaded with many other kinds of anti-inflammatory compounds.

“The hydrogel is designed so that drug release is triggered by the activity of specific, arthritis-related enzymes that are increased during flares. To test the TG-18 hydrogel, we exposed the gel to several different kinds of environments mimicking conditions in arthritic joints,” said Nitin Joshi, co-first author on the work an Instructor of Medicine at BWH.

When the gel was incubated in synovial fluid from a healthy human joint, drug release was minimal, but when incubated in synovial fluid from a patient with rheumatoid arthritis, the drug was readily released from the hydrogel. Importantly, the drug supply was not exhausted in one spike of synovial fluid — instead, it could be released in response to multiple spikes over time. The team also tested hydrogel’s effects on cells from cartilage and joints, finding that it appeared to be safe.

The team further tested the clinical efficacy of the TG-18 hydrogel in a mouse model of inflammatory arthritis. They choose a model, the K/BxN serum transfer model, in which disease severity can be precisely controlled, which allowed them to test the hydrogel in animals with different degrees of arthritis severity. They found that when arthritis was more severe, the locally injected hydrogel degraded more rapidly corresponding to increased drug release. Swelling and severity of arthritis diminished in response to the drug-loaded hydrogel.

One of the advantages of the hydrogel is that it offers the promise of treating arthritis specifically in the joints where the disease is flaring, rather than delivering a drug throughout the body.

“Local therapy could be a viable treatment option for patients with only one or a few inflamed joints, said co-corresponding author Joerg Ermann, MD, a rheumatologist in the BWH Division of Rheumatology, Immunology and Allergy. “Moreover, if a patient is already on a systemic drug but is experiencing a flare in a limited number of joints, we could specifically treat these joints rather than switching systemic therapy or adding another systemic drug. Having this option would substantially increase our ability to successfully manage arthritis flares in the clinic.”

The team will continue testing the hydrogel in preclinical models to further validate it, and continue to advance toward human clinical trials. The technology has been licensed by Alivio Therapeutics, which is developing therapies to treat inflammatory disorders via targeted disease immunomodulation.

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