title: In vitro immunomodulating properties of selected Sudanese medicinal plants.
abstract: Ethanolic extracts of 23 medicinal plants, commonly used in Sudanese folk medicines against infectious diseases, were investigated for their immunomodulating activity using luminol/lucigenin-based chemiluminescence assay. Preliminary screenings on whole blood oxidative burst activity showed inhibitory activities of 14 plant extracts, while only one plant, Balanites aegyptiaca fruits exhibited a proinflammatory activity. Further investigation was conducted by monitoring their effects on oxidative burst of isolated polymorphonuclear cells (PMNs) and mononuclear cells (MNCs) by using two different phagocytosis activators (serum opsonizing zymosan-A and PMA). Results obtained showed that the fruits and barks of Acacia nilotica, and leaves and barks of Khaya senegalensis, possess average inhibitory effects in the range of 70.7, 67.1, 69.5 and 67.4% on both types of phagocytes (PMNs and MNCs), respectively, at a 6.25 microg/mL concentration. Moderate inhibitory activity (52.2%) was exerted by the aerial parts of Xanthium brasilicum, while the rest of the plants showed only a weak inhibitory activity. The inhibition of oxidative burst activity was found to be irreversible in most of the extracts, except for Peganum harmala, Tephrosia apollinea, Tinospora bakis, and Vernonia amygdalina. Interestingly, the fruits of Balanites aegyptiaca exhibited a moderate proinflammatory effect (37-40.4% increases in ROS level compared to the control) at 25-100 microg/mL concentration in the case of whole blood along with PMNs phagocyte activity. The Tinospora bakis extract showed proinflammatory response at a low concentration (6.25 microg/mL) during activation with PMA. None of these extracts affected PMNs viability (90-98%) upon 2 h incubation, except of the ethanolic extracts of Acacia nilotica fruits and Balanites aegyptiaca barks.
authors.affiliation: Medicinal and Aromatic Plants Research Institute, National Center for Research, Khartoum, Sudan. wasyko2002@yahoo.com
authors.forename: W S
authors.initials: WS
authors.lastname: Koko
authors.forename: M Ahmed
authors.initials: MA
authors.lastname: Mesaik
authors.forename: S
authors.initials: S
authors.lastname: Yousaf
authors.forename: M
authors.initials: M
authors.lastname: Galal
authors.forename: M Iqbal
authors.initials: MI
authors.lastname: Choudhary
mesh_terms: D000166:Acridines / Q000737:chemistry; D000328:Adult; D004305:Dose-Response Relationship, Drug; D006801:Humans; D007155:Immunologic Factors / Q000008:administration & dosage / Q000302:isolation & purification / Q000494:pharmacology*; D007963:Leukocytes, Mononuclear / Q000187:drug effects / Q000378:metabolism; D008163:Luminescent Measurements; D008165:Luminol / Q000737:chemistry; D016488:Medicine, African Traditional; D009504:Neutrophils / Q000187:drug effects / Q000378:metabolism; D010936:Plant Extracts / Q000008:administration & dosage / Q000737:chemistry / Q000494:pharmacology*; D010946:Plants, Medicinal / Q000737:chemistry*; D016897:Respiratory Burst / Q000187:drug effects*; D013397:Sudan
chemical_list: D000166:Acridines; D007155:Immunologic Factors; D010936:Plant Extracts; C033472:10,10'-dimethyl-9,9'-biacridinium; D008165:Luminol