Electroporation is an electrical
technique that involves the application of high-voltage electric pulses for a
very short duration to enhance the skin permeability reversibly, for
macromolecules. It is a powerful transfection tool which is useful for studying
gene function. It actually focused on the vertebrate tissues and organisms,
recent work demonstrated the efficacy of this tool for delivering RNA into tick
eggs. Electroporation permeabilizes the membranes of cells. When an electrical
current is applied. The long RNA is usually delivered in a high ionic strength
medium. This process requires consideration of factors including tick
developmental stage, RNA does, electrode design, electrical field, and
duration. It is a useful method for delivering long RNA into immature tick
stages. It is a technique that is also being investigated for RNA delivery in
tick eggs. Ease of electroporation for
gene silencing in the tick egg stage would make RNA more widely. It is available
for biologists and future RNA applications in tick–host-pathogen interaction
and high-throughput tick functional genomic research. It is a transformation
technique that uses induction uptake by exposing cell walls to high-intensity
electrical field pulses.
Electroporation is performed with the
purpose-built appliances which create an electrostatic field in a cell
solution. The cell suspension is conveyed into a glass or plastic which has two
aluminum electrodes on its sides. For bacterial Electropermeabilization, a
suspension of around 50 microliters is used. This suspension of bacteria is
mixed with the plasmid and then ready to be transformed. The success of the Electropermeabilization
depends on the salt content and purity of the plasmid solution.
In vivo gene, electrotransfer was
first described in and now there are many preclinical studies of gene
electrotransfer. The method is used to deliver a large variety of genes for the
potential treatment of several diseases. Disorders in the immune system,
tumors, metabolic disorders, cardiovascular diseases, monogenetic diseases,
analgesia are such reasons.
Uses of Electroporation in the field of Medical Science:
The first medical application was
used for introducing poorly anticancer drugs into tumor nodules. Soon also gene
electro-transfer became of special interest because it is low cost, easiness of
realization and safety. Viral vectors can have serious limitations and
pathogenicity when used for DNA transfer.
Electroporation is based on a very
simple process. Host cells and selected suspended and molecules are in a
conductive solution, and an electrical circuit is closed around the mixture. An
electrical pulse at only lasting a few microseconds and an optimized voltage
and to a millisecond is discharged through the cell suspension. This disturbs
the phospholipid layer of the membrane and results in the formation of
temporary pores. The electric potential all across the cell rises to allow the charged
molecules like the DNA to drive throughout the pores in a manner similar to the
electrophoresis. The main advantage is its applicability for transient and
stable transfection of all cell types. Electropermeabilization is a process
that is easy and rapid and that’s why it is able to transfect a large number of
cells in a short time once optimum conditions are determined. The major
drawback is substantial cell death caused by high voltage pulses and the only
partially successful membrane repair. Requiring the use of huge quantities of
cells compared to chemical transfection methods. Instrumentation overcomes high
cell mortality by distributing the electrical pulse equally among the cells. It
maintains a stable pH, optimization of pulse and field strength parameters that
are still required to balance the electroporation efficiency and cell
viability.
Electroporation permits the cellular outline
of large highly charged molecules as DNA which cannot diffuse passively across
the hydrophobic bilayer core. This indicates the machine is the creation of
nm-scale water-filled holes in the membrane. Although dielectric breakdown and
electroporation both result from the application of an electric field, the
mechanisms are involved fundamentally different. In dielectric breakdown the material
is ionized, creating a conductive pathway. The material alteration is chemical.
The lipid molecules shift instead of chemically altered of their position in
electroporation and it opens a pore which performs as the conductive pathway
through the bilayer as it is filled with water.
Electroporation is an active
phenomenon that relies on the local transmembrane voltage at each point. It is
generally a specific trans-membrane voltage threshold that exists for the
manifestation of the electropermeabilization phenomenon. This leads to the
definition of an electric field magnitude entry for electropermeabilization.
That is, only the cells within areas are electroporated. If a second entry is
reached or surpassed, this process will compromise the viability of the cells.
Electroporation is a multi-step
process with several well-defined phases. At first, a short electrical pulse
must be applied. The typical parameters would be 300–400 mV for < 1 ms
across the membrane. Once the critical field is achieved then there is a rapid
localized rearrangement in lipid morphology. Since it is not electrically the
resulting structure is believed to be a "pre-pore". Conductive but leads are rapid to the
creation of a conductive pore. Proof for the existence of such pre-pores comes
mostly from the "flickering" of pores, which suggests a transition
between insulating and conductive states. It has been suggested that these
pre-pores are smaller.
Here we discuss some of the advantages and disadvantages of
Electroporation:-
Advantages:
- It is very effective with nearly all cells and space types.
- A large number of cells taking in the target DNA and molecule.
- The amount of DNA required that is smaller than for other methods.
- The procedure VIVO may be performed with intact tissue.
Disadvantages:
- Poor flexibility and control of parameters in low cell survival.
- Amplitude drop during the pulse low amplitude flexibility.
- Complex switching elements required impedance matching.
- Complicated design low output power.
