Multiscale Modeling of Skin Electroporation

Human
skin, the largest external organ of the body, provides a
selective barrier to therapeutics applied topically. The molecules
having specific chemical and physical properties can only penetrate
the deeper layer of the skin. However, the lag time for reaching a
steady state in the deeper layer is generally of the order of hours.
In order to deliver higher-molecular-weight, charged, and hydrophilic
therapeutics in the deeper layer, the skin barrier must be breached.
Electroporation is one of the methods used to breach the skin barrier
for enhancement of drug permeation and reduction of lag time. However,
the underlying mechanism responsible for the enhancement of drug permeation
is not well understood. In this study, a multiscale model of skin
electroporation is developed by connecting molecular phenomena to
a macroscopic model. At the atomic scale, molecular dynamics simulations
of the lipid matrix of the human stratum corneum (SC) were performed
under the influence of an external electric field. The pores get formed
during the electroporation process and the transport properties (diffusivity)
of drug molecules are computed. The diffusion coefficient obtained
during electroporation was found to be higher than passive diffusion.
However, this alone could not explain the multifold increase in the
drug flux on application of an electric field as observed in the experiments.
Hence, a finite element method (FEM) model of the skin SC is also
developed. The release of fentanyl through this model is compared
with the available experimental results. Both experimental and simulated
results of pore formation on application of an electric field and
many folds’ increase in drug flux are comparable. Once validated,
the framework was used for the design of skin electroporation experiments
(in silico) by changing the electric pulse parameters such as voltage,
pulse duration, and number of pulses. This multiscale modeling framework
provides valuable insight at the molecular and macroscopic levels
to design the electroporation experiments. The framework can be utilized
as a design tool for skin electroporation applications.



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