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Amani Cheikh,Rym Benkhalifa,Zied Landoulsi,Imen Chatti,Mohamed El Ayeb 대한약학회 2014 Archives of Pharmacal Research Vol.37 No.11
AahG50, the toxic fraction of Androctonus australishector venom, was studied on human Kv3.1 channelsactivation, stably expressed in Xenopus oocytes using the twoelectrodevoltage clamp technique. AahG50 reduced Kv3.1currents in a reversible concentration-dependent manner,withan IC50 value and a Hill coefficient of 40.4 ± 0.2 lg/ml and1.3 ± 0.05, respectively. AahG50 inhibited IKv3.1 withoutmodifying the current activation kinetics. The AahG50-induced inhibition of Kv3.1 channels was voltage-dependent,with a gradual increase at lower concentrations and over thevoltage range of channels opening. However, at higher concentrations,the inhibition exhibited voltage dependence onlyin the first range of channels opening from -20 to ?10 mV,but demonstrates a low degree of voltage-dependence whenchannels are fully activated. In the literature, toxins havepreviously been isolated from AahG50, KAaH1 and KAaH2and were reported not to have any effect on IKv3.1. Thepresent article’s findings suggest that AahG50 may contain apeptidic component active on Kv3.1 channels, which inhibitsIKv3.1 in a selective manner.
Mounawer Badri,Amina Ayadi,Asma Mahjoub,Amani Benltoufa,Manel Chaouachi,Rania Ranouch,Najah Ben Cheikh,Aissa Abdelguerfi,Meriem Laouar,Chedly Abdelly,Ndiko Ludidi,Naceur Djébali 한국식물병리학회 2023 Plant Pathology Journal Vol.39 No.2
Spring black stem and leaf spot, caused by Phoma medicaginis, is an issue in annual Medicago species. Therefore, in this study, we analyzed the response to P. medicaginis infection in a collection of 46 lines of three annual Medicago species (M. truncatula, M. ciliaris, and M. polymorpha) showing different geographic distribution in Tunisia. The reaction in the host to the disease is explained by the effects based on plant species, lines nested within species, treatment, the interaction of species × treatment, and the interaction of lines nested within species × treatment. Medicago ciliaris was the least affected for aerial growth under infection. Furthermore, the largest variation within species was found for M. truncatula under both conditions. Principal component analysis and hierarchical classification showed that M. ciliaris lines formed a separate group under control treatment and P. medicaginis infection and they are the most vigorous in growth. These results indicate that M. ciliaris is the least susceptible in response to P. medicaginis infection among the three Medicago species investigated here, which can be used as a good candidate in crop rotation to reduce disease pressure in the field and as a source of P. medicaginis resistance for the improvement of forage legumes.