KCC activity is controlled by protein phosphorylation, involving cascades of regulatory protein kinases (PK) and phosphatases (PP), on both serine–threonine and tyrosine residues [26,27]. The inhibitory action of o-vanillin could therefore be mediated via this cascade. To investigate this possibility, RBCs were pre-treated with N-ethylmaleimide
(NEM; 1 mM), a thiol-reacting reagent which activates KCC activity and abolishes its sensitivity to (de)phosphorylation [26]. Under these conditions, substantial inhibition of KCC activity by o-vanillin (5 mM) was still observed in RBCs from both HbSS and HbSC individuals (Figs. 4a & b). The IC50 for o-vanillin on KCC activity in NEM-treated RBCs from
HbSS patients was about 0.3 mM (Fig. 4c). It would therefore appear that the action of o-vanillin on KCC is not via the regulatory phosphorylation cascade but more likely directly on the transporter itself.
KCC activity is controlled by protein phosphorylation, involving cascades of regulatory protein kinases (PK) and phosphatases (PP), on both serine–threonine and tyrosine residues [26,27]. The inhibitory action of o-vanillin could therefore be mediated via this cascade. To investigate this possibility, RBCs were pre-treated with N-ethylmaleimide
(NEM; 1 mM), a thiol-reacting reagent which activates KCC activity and abolishes its sensitivity to (de)phosphorylation [26]. Under these conditions, substantial inhibition of KCC activity by o-vanillin (5 mM) was still observed in RBCs from both HbSS and HbSC individuals (Figs. 4a & b). The IC50 for o-vanillin on KCC activity in NEM-treated RBCs from
HbSS patients was about 0.3 mM (Fig. 4c). It would therefore appear that the action of o-vanillin on KCC is not via the regulatory phosphorylation cascade but more likely directly on the transporter itself.
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KCC activity is controlled by protein phosphorylation, involving cascades of regulatory protein kinases (PK) and phosphatases (PP), on both serine–threonine and tyrosine residues [26,27]. The inhibitory action of o-vanillin could therefore be mediated via this cascade. To investigate this possibility, RBCs were pre-treated with N-ethylmaleimide
(NEM; 1 mM), a thiol-reacting reagent which activates KCC activity and abolishes its sensitivity to (de)phosphorylation [26]. Under these conditions, substantial inhibition of KCC activity by o-vanillin (5 mM) was still observed in RBCs from both HbSS and HbSC individuals (Figs. 4a & b). The IC50 for o-vanillin on KCC activity in NEM-treated RBCs from
HbSS patients was about 0.3 mM (Fig. 4c). It would therefore appear that the action of o-vanillin on KCC is not via the regulatory phosphorylation cascade but more likely directly on the transporter itself.
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