调节脂质纳米颗粒与胺胺结合胆固醇用于改善mRNA的细胞内传递
Onesun Jung1, Hye-Youn Jung2, Le Thi Thuy1
1Department of Biochemistry, College of Natural Sciences, Chungnam National University, Daejeon, 34134, Republic of Korea.
Advanced healthcare materials
|February 12, 2024
概括
研究人员使用Hchol开发了一种新的脂质纳米粒子 (LNP),以改善mRNA输送. 这些增强的LNP显示出更高的效率和稳定性,提高了mRNA疫苗和基因疗法的治疗潜力.
科学领域:
- 生物技术是生物技术.
- 基因治疗 基因治疗
- 疫苗学 疫苗学 疫苗学
背景情况:
- 使者RNA (mRNA) 疗法在基因疗法和疫苗方面表现有前途.
- 脂质纳米粒子 (LNP) 是有效的mRNA输送载体,但在效率和稳定性方面面临挑战.
- 胆固醇是用于mRNA输送的LNP配方中的一个关键成分.
研究的目的:
- 开发一种新的可电离辅助胆固醇模拟物,3β[L-histidinamide-carbamoyl]胆固醇 (Hchol),以增强LNP在mRNA传递中的功效.
- 调查Hchol结合对LNP特性的影响,包括pKa值,内体逃逸和体内传递效率.
- 评估Hchol-LNPs在传递编码SARS-CoV-2的mRNA中的免疫性和有效性.
主要方法:
- 合成和表征的Hchol脂质.
- 将Hchol纳入LNP配方 (基于MC3和SM102) 中.
- 测量LNP pKa值的方法.
- 在pH值为5.5的红细胞血解的评估,以评估内体逃逸.
- 在小鼠体内mRNA输送研究.
- 用Hchol-LNP封装SARS-CoV-2尖端mRNA接种疫苗后对抗原特异性抗体反应的评估.
主要成果:
- 在基于MC3和SM102的配方中,Hchol-LNPs的pKa值约为6.03和6.61,分别为6.03和6.61.
- Hchol-LNPs显著提高了mRNA传递效率,这归因于增强的内体逃生.
- 在pH值为5.5的红细胞血解效率增加,表明有协同作用的膜不稳定.
- 在接受Hchol-LNPs治疗的小鼠体内显著增强mRNA输送.
- 用Hchol-LNP封装的SARS-CoV-2尖端mRNA接种疫苗诱导了强大的抗原特异性抗体.
结论:
- 将Hchol纳入LNP配方可以提高mRNA递送效率和稳定性.
- Hchol-LNP促进了有效的内体体逃生,从而改善了治疗结果.
- 这种新型LNP配方具有很大的潜力,可以推进基于mRNA的治疗方法,包括疫苗.
关键词:
3β[L-histidinamide-carbamoyl]胆固醇 (Hchol) 脂质的3β[L-histidinamide-carbamoyl]胆固醇 (Hchol) 脂质的3β[L-histidinamide-carbamoyl]胆固醇的3β[L-histidinamide-carbamoyl]胆固醇的3β[L-histidinamide-carbamoyl]胆固醇的3β[L-histidinamide-carbamoyl]胆固醇的3β[L-histidinamide-carbamoyl]胆固醇的3β[L-histidinamide-carbamoyl]胆固醇的3β[L-histidinamide-carbamoyl]胆固醇的3β[L-histidinamide-carbamoyl]胆固醇的3β[L-histidinamide-carbamoyl]胆固醇的3β细胞内体逃脱的方法帮助性脂质是帮助性脂质.脂质纳米颗粒的使用方法基于mRNA的治疗方法相关概念视频
pre-mRNA Processing
In eukaryotic cells, transcripts made by RNA polymerase are modified and processed before exiting the nucleus. Unprocessed RNA is called precursor mRNA or pre-mRNA to distinguish it from mature mRNA.
Once about 20-40 ribonucleotides have been joined together by RNA polymerase, a group of enzymes adds a “cap” to the 5’ end of the growing transcript. In this process, a 5’ phosphate is replaced by modified guanosine that has a methyl group attached to it (7-Methyl guanosine). This 5’ cap helps the...
Once about 20-40 ribonucleotides have been joined together by RNA polymerase, a group of enzymes adds a “cap” to the 5’ end of the growing transcript. In this process, a 5’ phosphate is replaced by modified guanosine that has a methyl group attached to it (7-Methyl guanosine). This 5’ cap helps the...
Chromatin Structure Regulates pre-mRNA Processing
In eukaryotic cells, nascent mRNA transcripts need to undergo many post-transcriptional modifications to reach the cell cytoplasm and translate into functional proteins. For a long time, transcription and pre-mRNA processing were considered two independent events that occur sequentially in the cell. However, it has now been well established that transcription and pre-mRNA processing are two simultaneous processes that are precisely regulated inside the cell.
The chromatin structure, especially...
The chromatin structure, especially...
Regulation of Expression Occurs at Multiple Steps
Gene expression can be regulated at almost every step from gene to protein. Transcription is the step that is most commonly regulated. This involves the binding of proteins to short regulatory sequences on the DNA. This association can either promote or inhibit the transcription of a gene associated with the respective sequence.
Transcription results in the generation of precursor (pre-mRNA) that consists of both exons and introns, which needs further processing before being translated to a...
Transcription results in the generation of precursor (pre-mRNA) that consists of both exons and introns, which needs further processing before being translated to a...
RNA Editing
RNA editing is a post-transcriptional modification where a precursor mRNA (pre-mRNA) nucleotide sequence is changed by base insertion, deletion, or modification. The extent of RNA editing varies from a few hundred bases, in mitochondrial DNA of trypanosomes, to a just single base, in nuclear genes of mammals. Even a single base change in the pre-mRNA can convert a codon for one amino acid into the codon for another amino acid or a stop codon. This type of re-coding can significantly affect the...
mRNA Stability and Gene Expression
The structure and stability of mRNA molecules regulates gene expression, as mRNAs are a key step in the pathway from gene to protein. In eukaryotes, the half-life of mRNA varies from a few minutes up to several days. mRNA stability is essential in growth and development. The absence of the proteins regulating its stability, such as tristetraprolin in mice, can cause systemic issues, including bone marrow overgrowth, inflammation, and autoimmunity.
Cis-acting Elements involved in mRNA stability
Cis-acting Elements involved in mRNA stability
Regulation of Expression at Multiple Steps
The gene expression in cells is regulated at different stages: (i) transcription, (ii) RNA processing, (iii) RNA localization, and (iv) translation. Transcriptional regulation is mediated by regulatory proteins such as transcription factors, activators, or repressors—these control gene expression by initiating or inhibiting the transcription of genes. Once a precursor or pre-mRNA is produced, it undergoes post-transcriptional modification, including 5' capping, splicing, and the addition of a...


