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Álvaro Peña ; Juan Heredero ; Beatriz Blandín , et al. bioRxiv,2024. DOI: 10.1101/2024.10.09.617396
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Abstract: Ionizable lipids are an essential component of lipid nanoparticles (LNPs) for an efficient mRNA delivery. However, optimizing their chemical structures for high protein expression, efficient endosomal escape, and selective organ targeting remains challenging due to complex structure-activity relationships and multistep synthesis. In this study, we introduce a rapid, high-throughput platform for screening ionizable lipids using a two-step, scalable synthesis involving a one-pot 3-component click-like reaction. This method, herein known as the STAAR approach, standing for Sequential Thiolactone Amine Acrylate Reaction, allowed for the combinatorial synthesis and in vivo screening of 91 novel lipids, followed by a structure-activity study. This led to the development of CP-LC-0729, an ionizable lipid that significantly surpasses the benchmark in protein expression while showing no in vivo toxicity. Additionally, the STAAR lipid platform was further validated by incorporating a one-step strategy to yield a permanently cationic lipid which was tested following a fifth-lipid formulation strategy. The in vivo results showed a highly selective lung delivery with a 32-fold increase in protein expression, outperforming current endogenous targeting strategies. All these findings underscore the potential of lipid CP-LC-0729 and the STAAR lipid platform in advancing the efficiency and specificity of mRNA delivery systems, while also advancing the development of new ionizable lipids.
Keywords: lipid nanoparticle ; ionizable lipid ; drug delivery ; lipids ; extrahepatic ; lung targeting ; mRNA therapeutics
Purchased from AmBeed: 41838-46-4 ; 27578-60-5
CAS No. : | 27578-60-5 | MDL No. : | MFCD00006516 |
Formula : | C7H16N2 | Boiling Point : | No data available |
Linear Structure Formula : | NH2C2H4NC5H10 | InChI Key : | CJNRGSHEMCMUOE-UHFFFAOYSA-N |
M.W : | 128.22 | Pubchem ID : | 33944 |
Synonyms : |
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Chemical Name : | N-(2-Aminoethyl)piperidine |
Signal Word: | Danger | Class: | 8,3 |
Precautionary Statements: | P280-P305+P351+P338-P310 | UN#: | 2734 |
Hazard Statements: | H226-H314 | Packing Group: | Ⅱ |
GHS Pictogram: |
* All experimental methods are cited from the reference, please refer to the original source for details. We do not guarantee the accuracy of the content in the reference.
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
64% | at 120℃; | Step 1: tert-Butyl 4- (2- (piperidin-1-yl) ethylamino) benzoate (187) [0348] tert-Butyl 4-FLUOROBENZOATE 185 (0.502g, 2.55 MMOL) and 24PIPERIDIN-1-YL) ETHANAMINE 186 (1.46 mL, 10.21 MMOL) were stirred neat at 120C overnight then diluted with ethyl acetate, washed with saturated aqueous sodium bicarbonate (LX), brine (LX), dried over magnesium sulfate and evaporated to give 187 (0.501g, 64%). H NMR: (DMSO) 6 (ppm): 400 MHz, (DMSO) d (ppm): 7.59 (d, J= 8.8 Hz, 2H), 6.55 (d, J= 8.8 Hz, 2H), 6.24 (t, J= 5.1 Hz, 1H), 4.11 (m, 2H), 3.21 to 3.13 (m, 6H), 2.44 (t, J= 7.1 Hz, 2H), 2.37 (m, 2H), 1.49 (s, 9H), 1.47 to 1.38 (m, 2H). MS: 304.22 (CALC), 249.1 (M-T8U). |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
65% | In dichloromethane; at 20℃; for 0.5h; | General procedure: To a solution of benzoyl chloride (1 mmol) in dry dichloromethane (10 ml) was added amine (1 mmol), and the mixture was stirred for 0.5 h at room temperature. After solvent evaporation, the crude product was purified by column chromatography on silica (CHCl3:CH3CH2OH = 9:1) resulting in yellow thick oil and crystallized from the dichloromethane-petroleum ether mixture. |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
89% | With benzotriazol-1-ol; 1-ethyl-(3-(3-dimethylamino)propyl)-carbodiimide hydrochloride; In N,N-dimethyl-formamide; at 20℃; for 16h; | To a solution of <strong>[23351-91-9]5-bromoisophthalic acid</strong> 1(200 mg, 0.82 mmol) and 1-piperidineethanamine (240 mL, 1.17mmol) in DMF (2.5 mL) was added EDC*HCl (330 mg, 1.73 mmol) and HOBt-H2O (25.2 mg, 0.165 mmol). The reaction mixture was stirred for 16 h at room temperature. 10 mL of saturated NaHCO3 solution was added. The aqueous layer was extracted with DCM(3 10 mL). The combined organic layer was dried over MgSO4 and evaporated. The residue was purified by flash chromatography(DCM/MeOH(NH3), 10:0 to 9.7:0.3 (v/v)). The title compound 14(340 mg, 0.73 mmol, 89percent) was obtained as a white solid. Mp:127.3 C. 1H NMR (300 MHz), d (ppm, CDCl3): 8.23 (t, J = 1.5 Hz,1H); 8.04 (d, J = 1.5 Hz, 2H); 7.46 (t, J = 4.7 Hz, 2H); 3.48 (td, J =5.9 Hz, J = 5.5 Hz, 4H); 2.50 (t, J = 6.1 Hz, 4H); 2.38 (m, 8H); 1.54(m, 8H); 1.40 (m, 4H). 13C NMR (75 MHz), d (ppm, CDCl3): 165.3;136.3; 133.2; 123.7; 123.0; 57.4; 54.3; 36.6; 25.7; 24.2. LC?MS(ESI) m/z Calculated: 465.2?467.2, Found: 465.0?466.9, 233.1?234.0 [(M+2H)/2]+. |
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