Osteoporosis :: New drug to prevent osteoporosis

Substances produced in the body that act like those found in the cannabis plant help preserve bone density, according to researchers at the Hebrew University of Jerusalem.

Based on this finding, a prototype for a new drug to prevent osteoporosis (loss of bone density) without any psychoactive side effects has already been developed.

The researchers, from the Bone Laboratory of the Hebrew University, are headed by Prof. Itai Bab, working in cooperation with Prof. Esther Shohami of the Laboratory for the Study of Bain Trauma; Prof. Raphael Mechoulam of the Hebrew University School of Pharmacy; doctoral students Orr Ofek, Vardits Krem and Yossi Tam; and master’s degree student Meirav Fogel.

Substances made in the body called endocannabinoids are composed mainly of fatty acids which were discovered during the last 15 years. (The fatty acid anandamid was discovered by Prof. Mechoulam in 1992.) These materials, which are produced mainly in the brain, are present also in the bone and other tissues and have similar effects to those of the active components in hashish and marijuana, produced from the cannabis plant.

These substances bind to and activate two receptors, CB1 and CB2. The first is found in the nervous system and is responsible for the psychoactive effects of the active components in the cannabis plant and endocannanoids. The second receptor is found in the immune system. It is not known to be involved with psychoactive responses, and there has been little information about its physiological function.

The scientists’ findings have thus assigned, for the first time, a physiological function to CB2 in preserving bone density and showed that it stimulates bone building and reduces bone loss. This indicates that substances that active the CB2 receptor can be used as basis for the development of drugs for osteoporosis patients. Indeed, the Hebrew University researchers have developed a new synthetic compound, HU-308, which activates CB2 and slows the development of osteoporosis in mice. This compound forms the basis for a cannabinoid-based, anti-osteoporotic type drug which has also been found to be free of any psychoactive side effects.

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