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Lymphocyte Isolation from Human Skin for Phenotypic Analysis and Ex Vivo Cell Culture

Lymphocyte Isolation from Human Skin for Phenotypic Analysis and Ex Vivo Cell Culture

Published on: April 8, 2016

In vitro skin puncture methodology for material characterization.

Joseph LeSueur¹, Carolyn Hampton², Michael Kleinberger²

¹Joint Department of Biomedical Engineering, Marquette University and Medical College of Wisconsin, WI, USA; Neroscience Research Labs, Zablocki Veterans Affairs Medical Center, WI, USA.

Medical Engineering & Physics

|August 19, 2024

Summary

Understanding natural skin tension is crucial for accurate puncture studies. Pre-conditioning skin samples under physiological tension improves mechanical testing reliability for cosmetics, surgery, and protective gear development.

Keywords:

Boundary conditions Failure thresholds Material testing Natural tension Porcine skin Pre-conditioning

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Area of Science:

Biomechanics
Materials Science
Dermatology

Background:

Quantifying skin's mechanical properties is vital for cosmetics, surgery, forensics, and protective clothing.
Previous skin puncture studies lacked consistent, physiological boundary conditions.
Skin exhibits varying natural tension based on anatomical location.

Purpose of the Study:

To establish natural skin tension using shrinkage experiments.
To investigate the effects of initial tension and pre-conditioning on skin puncture resistance.
To define optimal boundary conditions for in vitro skin mechanical testing.

Main Methods:

Porcine skin samples from different anatomical locations were excised to measure natural tension via diameter reduction.
Quasistatic puncture tests were conducted using a 5 mm spherical impactor on skin samples under varying initial tensions and pre-conditioning cycles.
An electrohydraulic load frame and custom clamping apparatus were employed for controlled testing.

Main Results:

Skin shrinkage varied significantly by anatomical location (leg: 19.5%, flank: 28.5%, abdomen: 38.4%).
Lower initial tension (<5%) resulted in higher force at failure (279.2 N) compared to higher initial tension (>25%, 195.1 N).
Eight pre-conditioning cycles reduced hysteresis by 45% and significantly decreased variation in mechanical properties.
Pre-conditioned samples at physiological tension (14-25%) showed greater normalized force at failure (278.3 N/mm) than non-conditioned samples (234.4 N/mm).

Conclusions:

Physiological initial tension and pre-conditioning are essential for reliable in vitro skin puncture studies.
Anatomical location dictates natural skin tension, which must be replicated for accurate testing.
Characterizing skin's mechanical behavior under defined boundary conditions aids in developing finite element models for protective clothing and forensic analysis.