生物等效性和生物利用度杂志

抽象的

Season Variation and Starvation Period Influence on the Antithrombotic Activity of Leech Saliva Extract From the Medicinal Malaysian Leech, Hirudinaria Manillensis

Abbas Mohammad Ghawi, Abdualrahman M Abdualkader, Ahmed Merzouk and Mohamed Alaama

Leech therapy has been practiced for a wide range of therapeutical purposes since the extreme old ages. Nowadays, leech application in plastic and microsurgery has been considered as a promising tool. In Malaysia, traditional physicians have used the medicinal leeches as an effective remedy for bloodletting and many body disorders. Leech saliva extract (LSE) was collected after feeding leeches on the phagostimulatory solution through parafilm membrane. The total protein concentration was estimated using Bradford assay. The antithrombin activity was evaluated using the amidolytic assay of the synthetic substrate S-2238 and thrombin time assay in vitro. It was found that LSE could inhibit thrombin-medicated hydrolysis of the substrate. The extract effectively prolonged thrombin time of the citrated plasma in a linear dose-dependent manner. It was found that the extract collected during the dry season was more biologically active than those collected during the rainy season. Likewise, results revealed that the longer the starvation period, the lower the antithrombin activity. For effective utilization of leech therapy or leech products, we recommend to be used during the dry season and after a starvation period not more than 16 weeks.