Effects of the aqueous fraction of the ethanol extract of the leaves of Cissampelos sympodialis eichl. in human neutrophils

✍ Scribed by G. Thomas; M. Selak; P. M. Henson

• Publisher: John Wiley and Sons
• Year: 1999
• Tongue: English
• Weight: 84 KB
• Volume: 13
• Category: Article
• ISSN: 0951-418X
• DOI: 10.1002/(sici)1099-1573(199902)13:1<9::aid-ptr389>3.0.co;2-e

✦ Synopsis

An aqueous fraction (10-300 mg/mL) of the ethanol extract of the leaves of Cissampelos sympodialis Eichl inhibited N-formyl-Met-Leu-Phe (fMLP)-induced release of lysozyme and myeloperoxidase from human neutrophils. Inhibition by the fraction, as well as by dibutyryl-cAMP and prostaglandin E 2 , was substantially greater when the cells were pretreated with the phosphodiesterase (PDE) inhibitor isobutyl methyl xanthine (IBMX) indicating that the effect may be mediated by cAMP. Measurement of intracellular cAMP levels showed that the fraction (30-100 mg/mL) increased the nucleotide levels in IBMX-pretreated neutrophils which was unaffected by propranolol. Cyclic AMP dependent protein kinase A activity was also increased by the fraction (1.5-100 mg/mL). Superoxide anion generation induced by fMLP in cytochalasin B-treated cells primed with PAF was not inhibited by the aqueous fraction. The results indicate that the aqueous fraction of Cissampelos sympodialis inhibits neutrophil degranulation by a cAMPdependent mechanism which may be relevant to the use of the plant as an anti-asthmatic agent in folk medicine.