Gene transfer into mammalian cells by jet injection

Area of Science:

• Biotechnology
• Molecular Biology
• Animal Science

Background:

• Gene transfer into animal tissues is crucial for research and therapeutic applications.
• Existing methods like needle injection, lipofection, and particle bombardment have limitations.
• Developing efficient and non-invasive DNA delivery systems is an ongoing challenge.

Purpose of the Study:

• To evaluate jet injection as a method for delivering DNA into living animal tissues.
• To determine the efficiency and range of DNA transfection using jet injection.
• To explore the potential of jet injection for genetic vaccination and gene therapy.

Main Methods:

• Utilized a jet injector (Ped-o-jet) to deliver DNA solutions (100–300 microliters) into various tissues (muscle, fat, skin, mammary) of mice and sheep.
• Assessed DNA presence in cells surrounding the injection path, up to 2 cm from the injection site.
• Investigated the impact of injection force on the efficiency of DNA transfer.

Main Results:

• Demonstrated successful transfection of muscle, fat, skin, and mammary tissues in mice and sheep.
• Confirmed that introduced DNA is expressed in cells surrounding the jet's path.
• Established that DNA transfer efficiency is directly dependent on the force of the jet injection.
• Showed successful transfection up to 2 cm from the injection site through intact skin.

Conclusions:

• Jet injection is a viable and effective technique for delivering "naked" DNA into a variety of animal tissues.
• The efficiency of this gene transfer method is controllable by adjusting the injection force.
• Jet injection presents a promising alternative to conventional methods for applications in genetic vaccination and gene therapy.