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Treatment with Enzyme May Keep MS Muscle Stiffness at Bay

September 28, 2016

A new study shows that an enzyme called hyaluronidase may be effective in reducing muscle spasticity resulting from neurological disorders such as multiple sclerosis.

The results were published in a study titled “Human Recombinant Hyaluronidase Injections For Upper Limb Muscle Stiffness in Individuals With Cerebral Injury: A Case Series,” in the journal EBioMedicine by a group of researchers from the NYU Langone Medical Center.

Muscle spasticity is a condition characterized by muscle stiffness in one or more muscles and reduced joint movement, which causes pain and disability. The necessity for a treatment option that could effectively help patients with their movement problems led the team to consider the possible involvement of a sugar molecule, called hyaluronan. This molecule accumulates in the joints and muscles after neurological damage, promoting stiffness.

The team hypothesized that injections of an enzyme called hyaluronidase, which breaks down hyaluronan, would reverse its accumulation, reduce muscle stiffness, and increase joint movement. The team tested this idea by administering hyaluronidase injections in 20 patients ages 10 to 77 with moderate or severe spasticity in the arms resulting from neurological damage, and in whom other treatments had not been effective.

The neurological and musculoskeletal assessment of the patients was recorded in video in several time points: before the treatment; two, four, and six weeks after the injection; and three to five months after the injection.

Results showed that, whereas before the treatment the joints tested had moderate (50.6 percent) or severe (44.4 percent) stiffness, after the treatment these values decreased to 15.3 percent and 5.8 percent, respectively, within two weeks. The improvement in muscle stiffness induced by the injection lasted for at least three months, with no recorded muscle weakness or significant side effects.

“These findings fill a critical gap in the understanding of muscle stiffness, and present a promising treatment for spasticity, a vexing problem that affects millions of people worldwide,” Dr. Preeti Raghavan, MD, the leading author of the study, said in a news release.