Provided is a liposome for use in the delivery of nucleic acids, comprising a cationic lipid compound, a phospholipid and a long-acting lipid, wherin the weight percentage content of the cationic lipid compound is from 50% to 90%, and the cationic lipid compound is composed of a lipid compound and a cholesterol lipid compound. Also provided are a nucleic acid-liposome preparation comprising the above-mentioned liposome and a nucleic acid encapsulated therein, and a preparation method for the preparation. The content of the nucleic acid drug loaded in the nucleic acid-liposome preparation is comparatively high, and hence, under the conditions of administration of the same dose, the intake amount of the cationic lipid compound relatively decreases, such that the toxicity is lowered.
本发明提供了一种用于递送核酸的脂质体,由阳离子脂质化合物、
磷脂和长效脂质组成,其中阳离子脂质化合物的重量百分比含量为 50%至 90%,阳离子脂质化合物由脂质化合物和
胆固醇脂质化合物组成。还提供了一种核酸-脂质体制剂,包括上述脂质体和封装在其中的核酸,以及该制剂的制备方法。该核酸-脂质体制剂中负载的核酸药物含量相对较高,因此在相同剂量给药条件下,阳离子脂质化合物的摄入量相对减少,从而降低了毒性。