An ice-inspired lubricant improves osteoarthritis signs in rats

With the Winter Olympics approaching, many individuals will quickly be tuning in to observe occasions that happen on ice, similar to determine skating, pace skating and ice hockey. An ultrathin, super-lubricating layer of water on the ice’s floor is crucial for skaters’ sleek glides. Impressed by this floor, researchers reporting in ACS Nano have developed a therapy for osteoarthritis that enhances lubrication and reduces friction and irritation in a rat mannequin of the illness.

Osteoarthritis, a continual illness frequent in middle-aged and older folks, is characterised by persistent irritation and degeneration of cartilage within the joints. Anti-inflammatory medication may also help relieve ache and irritation, however long-term use can cut back their effectiveness or trigger gastrointestinal issues. Corticosteroids injected straight into the joint present non permanent aid, however frequent remedies can generally harm the cartilage. Yuanjin Zhao and colleagues needed to develop drug supply particles that, when injected right into a joint, might safely improve lubrication and reduce irritation.

The researchers primarily based their particles on hyaluronic acid (HA), a pure polysaccharide already used as a lubricant to deal with osteoarthritis, however this molecule degrades quickly contained in the physique. So the researchers used a microfluidic gadget to make tiny methacrylate anhydride-HA gel particles, which they reasoned is likely to be stronger and persist longer within the physique than an HA answer. To reinforce the lubrication of the particles, the staff coated them with 2-methylacryloyloxyethyl phosphorylcholine (MPC), which has positively and negatively charged chemical teams that entice a skinny layer of water, just like ice. As well as, the particles’ pores had been loaded with an anti-inflammatory drug, which may very well be slowly and constantly launched. The researchers then injected drug-loaded HA-MPC particles into the knee joints of rats with early-stage osteoarthritis. The joints of handled rats had been extra lubricated and had much less cartilage destruction, joint friction and irritation in contrast with a management group. The handled rats additionally expressed greater ranges of collagen II and aggrecan, two markers of wholesome cartilage. The particles have nice potential for medical functions, however first they have to bear extra animal and biosafety checks, the researchers say.