Calcinosis--calcinogenic plants.
The calcinogenic plants are among the most noxious plants to animals in the world. The pathological and biochemical effects of calcinogenic plants in cattle, sheep, goats, pigs, horses, buffalo and laboratory animals have been determined. The chemical nature of the toxic agents and the precise mechanism by with the calcinogenic plants induces calcinosis have been defined. Most of the active principle present as steroidal glycoside is hydrolyzed in intestine, rumen and other tissues or by the bacterial flora releasing the steroidal fragment, in most cases 1,25(OH)(2)D(3). The excess of vitamin D stimulates CaBP synthesis and calcium and phosphate absorption, producing hypercalcemia and/or hyperphosphatemia. The excessively absorbed mineral cannot be physiologically accommodated, and the deposition in soft tissues results in calcinosis. The different means of treatment of calcinosis and control of calcinogenic plants are discussed with regards to their effectiveness. A number of potential uses of calcinogenic plants have been suggested but none has been exploited on a large scale. The understanding of the mechanisms involved with calcinosis contributed enormously to the compression of vitamin D mechanism. Research methods were developed and improved but a lot is to be done in this fascinating subject.
Mello
J R B
JR
Department of Pharmacology, Federal University of Rio Grande do Sul, R. Sarmento Leite, 500/202, RS CEP 90046-900, Porto Alegre, Brazil.
D000818:Animals; D002020:Buffaloes; D002114:Calcinosis / Q000662:veterinary*; D002417:Cattle; D006041:Goats; D006736:Horses; D010939:Plant Poisoning / Q000662:veterinary*; D010947:Plants, Toxic; D012756:Sheep; D013552:Swine