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小石头IX

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[求助] 有关药物非线性问题,如何回复SCI审稿人,请赐教

我现在正在做的一个植物药发现是非线性,随后做了蛋白结合实验和细胞色素P450的实验,结果发现蛋白结合在低浓度时很不稳定,应该是低浓度区域线性上升,高浓度区域基本稳定。CYP实验发现CYP2D6是主要代谢酶,而这个药或其代谢产物则主要可以诱导CYP3A4和CYPA2的催化活性。

请问这些结果要怎么解释非线性呢?本来已经投了文章,但是审稿人指出我们这一部分说的不是很清楚,怀疑这些不能解释非线性。

下面这段话是审稿人的话,请大神赐教该怎么回答啊?
The authors demonstrated that 5 microg/mL 药物A cannot inhibit metabolism of dextromethorphan, which is mainly mediated by CYP2D6.  And in the in vivo study, the authors suggested that non-linear pharmacokinetics of 药物A is due to the saturation of metabolism mediated by CYP2D6.  However, the maximum unbound concentration of 药物 is estimated to be around 13(药物体内最大浓度) * 0.15(体内游离的药物) = 1.95 microg/mL.  Thus, under such condition, CYP2D6-mediated metabolism cannot be inhibited at the plasma concentration of 药物A the authors tested judging from the in vitro inhibition study.  How do the authors explain such discrepancy?
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