Testing the <em>In Vitro</em> and <em>In Vivo</em> Efficiency of mRNA-Lipid Nanoparticles Formulated by Microfluidic Mixing

Rakan El-Mayta; Marshall S. Padilla; Margaret M. Billingsley; Xuexiang Han; Michael J. Mitchell

doi:10.3791/64810

Testing the In Vitro and In Vivo Efficiency of mRNA-Lipid Nanoparticles Formula...

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Bioengineering

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JoVE Journal Bioengineering

Testing the In Vitro and In Vivo Efficiency of mRNA-Lipid Nanoparticles Formulated by Microfluidic Mixing

Testing the In Vitro and In Vivo Efficiency of mRNA-Lipid Nanoparticles Formulated by Microfluidic Mixing

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08:55 min

January 20, 2023

DOI: 10.3791/64810-v

Rakan El-Mayta¹, Marshall S. Padilla¹, Margaret M. Billingsley¹, Xuexiang Han¹, Michael J. Mitchell¹

¹Department of Bioengineering,University of Pennsylvania

Overview

This article presents a protocol for formulating lipid nanoparticles (LNPs) that encapsulate mRNA encoding firefly luciferase. The LNPs were evaluated for their potency both in vitro in HepG2 cells and in vivo in C57BL/6 mice.

Key Study Components

Area of Science

Nanoparticle formulation
mRNA delivery systems
In vitro and in vivo testing

Background

Lipid nanoparticles are crucial for mRNA delivery.
Formulation parameters can significantly affect nanoparticle performance.
Standardized protocols enhance reproducibility and comparability.
Understanding potency and biodistribution is essential for therapeutic applications.

Purpose of Study

To develop a reliable protocol for LNP formulation.
To assess the potency of LNPs in different biological contexts.
To provide a framework for comparing various LNP formulations.

Methods Used

Preparation of lipid nanoparticles encapsulating mRNA.
In vitro testing in HepG2 cells.
In vivo testing in C57BL/6 mice.
Evaluation of formulation parameters and biodistribution.

Main Results

Successful formulation of LNPs encapsulating mRNA.
Demonstrated potency in both in vitro and in vivo models.
Identified key formulation parameters affecting performance.
Standardized protocol allows for consistent comparisons.

Conclusions

The developed protocol is effective for LNP formulation.
In vitro and in vivo testing confirms the utility of LNPs for mRNA delivery.
Future studies can build on this framework for further optimization.

Frequently Asked Questions

What are lipid nanoparticles?

Lipid nanoparticles are carriers used to deliver mRNA and other therapeutic agents effectively.

How are the potency and biodistribution of LNPs evaluated?

Potency is assessed through in vitro and in vivo testing, while biodistribution studies track the location and concentration of LNPs in biological systems.

What is the significance of using firefly luciferase mRNA?

Firefly luciferase serves as a reporter gene, allowing researchers to measure the effectiveness of mRNA delivery and expression.

Can the protocol be adapted for other types of mRNA?

Yes, the protocol can be modified to accommodate different mRNA sequences and formulations.

What are the challenges in formulating LNPs?

Challenges include optimizing formulation parameters and ensuring consistent potency and biodistribution across different batches.

Is this protocol suitable for clinical applications?

While this protocol is designed for research purposes, it lays the groundwork for potential clinical applications of LNPs in mRNA therapeutics.

Here, a protocol for formulating lipid nanoparticles (LNPs) that encapsulate mRNA encoding firefly luciferase is presented. These LNPs were tested for their potency in vitro in HepG2 cells and in vivo in C57BL/6 mice.

This protocol can be used to formulate consistent lipid nanoparticles encapsulating MRA. Formulation parameters can be tuned and the various lipid nanoparticles can be evaluated for their potency and biodistribution. A standardized protocol for lipid nanoparticle formulation and in vitro and in vivo testing can be used to formulate consistent lipid nanoparticles that can be compared with each other.

There are a lot of small details to keep in mind when formulating and evaluating nanoparticle potency, but which details accounted for? Preparing the formulation should not be difficult. Begin by filling a clean, four liter beaker with 200 to 300 milliliters of fresh 10X PBS, and diluting it to 1X with ultrapure water.

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