Further, we examined the effect of scPPX1 on the single channel activity of TRPM8 in planar lipid bilayers (Fig. 8, 9). Channels were obtained in presence of 1% diC16 PtdIns(4,5)P2 and 500 μM menthol with subsequent addition of 2 μg/ml scPPX1. No change in channel activity was detected when scPPX1 was added to the external side of TRPM8. Conversely, addition of scPPX1 to the internal side resulted in the inhibition of TRPM8 currents by affecting both the open probability and conductance of the channel. We first analyzed the changes in the open probability of the channel upon the cleavage of polyP. We found that TRPM8 channel openings in inward direction were eliminated very rapidly (within 1–2 min) after the addition of scPPX1. In contrast, the open probabilityof the channel in outward direction exhibited much slower changes (up to 30min). Figure 8A demonstrates current traces recordings obtained at −150 +150 mV voltage ramps before and after the treatment with scPPX1 in a time courseat the beginning of 3rd, 10th, 18th, 28th and 33rd minutes. The statistics of
the changes in open probability was obtained at different voltages in gap-free recordings for TRPM8 alone or after the treatment with scPPX1 for the following intervals of time: 5–7 min, 9–11 min, 14–16 min, 20–23 min, and 28–32 min
(Fig. 8B). Overall 16 experiments were conducted and open probabilities valuesobtained for each voltage were derived from the analysis of at least 550–2636events.
Further, we examined the effect of scPPX1 on the single channel activity of TRPM8 in planar lipid bilayers (Fig. 8, 9). Channels were obtained in presence of 1% diC16 PtdIns(4,5)P2 and 500 μM menthol with subsequent addition of 2 μg/ml scPPX1. No change in channel activity was detected when scPPX1 was added to the external side of TRPM8. Conversely, addition of scPPX1 to the internal side resulted in the inhibition of TRPM8 currents by affecting both the open probability and conductance of the channel. We first analyzed the changes in the open probability of the channel upon the cleavage of polyP. We found that TRPM8 channel openings in inward direction were eliminated very rapidly (within 1–2 min) after the addition of scPPX1. In contrast, the open probabilityof the channel in outward direction exhibited much slower changes (up to 30min). Figure 8A demonstrates current traces recordings obtained at −150 +150 mV voltage ramps before and after the treatment with scPPX1 in a time courseat the beginning of 3rd, 10th, 18th, 28th and 33rd minutes. The statistics ofthe changes in open probability was obtained at different voltages in gap-free recordings for TRPM8 alone or after the treatment with scPPX1 for the following intervals of time: 5–7 min, 9–11 min, 14–16 min, 20–23 min, and 28–32 min(Fig. 8B). Overall 16 experiments were conducted and open probabilities valuesobtained for each voltage were derived from the analysis of at least 550–2636events.
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