Penn study suggests a new type of pain reliever that may benefit the heart

Furthermore, the composition of the animals’ blood vessels showed that the disease process had not only slowed, but also stabilized. This study points to the possibility of a new class of nonsteroidal anti-inflammatory drugs (NSAIDs) that steer clear of heart-disease risk and work to reduce it.

NSAIDs like ibuprofen and naproxen relieve pain and inflammation by blocking the cyclooxygenases, or COX enzymes. These enzymes help make fats called prostaglandins. COX-2 is the most important source of the two prostaglandins – PGE2 and prostacyclin – that mediate pain and inflammation. However, COX-2-derived PGE2 and prostacyclin may also protect the heart, and loss of this function – particularly suppression of prostacyclin – explains the risk of heart attacks from NSAIDs that inhibit COX-2, such as rofecoxib (Vioxx), valdecoxib (Bextra), and celecoxib (Celebrex).

The problems with COX-2 inhibitors have prompted the search for alternative drug targets that suppress pain and inflammation yet are safe for the cardiovascular system. One possibility is an enzyme called mPGES-1, which converts PGH2 (a chemical product of COX-2) into PGE2. Previous studies at other institutions in mice lacking mPGES-1 suggest that inhibitors of this enzyme might retain much of the effectiveness of NSAIDs in combating pain and inflammation.

However, unlike COX-2 inhibition or deletion, the Penn researchers had found that mPGES-1 deletion did not elevate blood pressure or predispose the mice to thrombosis. This work began to raise the possibility that mPGES-1 inhibitors might even benefit the heart.

In the PNAS study, the researchers studied the impact of deleting the mPGES-1 gene in mice predisposed to hardening of the arteries. Removing the enzyme had a dramatic effect on the development of the disease. “Both male and female mice slowed their development of atherosclerosis,” explained first author Miao Wang, a postdoctoral fellow in the Penn Institute.

“It seems that it is the complete reverse of the mechanism that creates problems for COX-2 inhibitors,” commented Dr Garret FitzGerald, director of the Institute for Translational Medicine and Therapeutics at Penn. Mice lacking mPGES-1 boost their production of prostacyclin, the major heart-protecting fat produced by COX-2. They do this by redirecting prostacylcin to vascular smooth muscle cells. The same mechanism explains the group’s earlier findings on blood pressure and thrombosis.

“It remains to be determined whether specific inhibitors of mPGES-1 can replicate the consequences of removing the gene” explains FitzGerald, “And if so, whether these results will translate from mice to humans.”

In the meantime, these results, say the investigators, will fuel interest in the possibility of a new class of “super NSAIDs,” which may not just avoid the risk of heart disease, but also actually work to diminish it.