Structural Analysis of Human Tissue

The object of this study is to analyze fresh human skin samples using several up-to-date technologies to get parameters on the mechanical, biochemical and structural distribution of the main components of the capillary-tissue unit.

Our working hypothesis is that both structural components of the dermis are not evenly distributed along parallel planes. The investigators further hypothesize the the distribution patterns determine functional and mechanical differences along dermal layers.

Study Overview

• Status: Terminated
• Conditions: Cutis Laxa

Detailed Description

Background The skin is a large organ that participates in many protective and homeostatic processes. The functions of the skin can be roughly divided into systemic and local ; both are interrelated but relationships are poorly understood and studying them requires a multiscale approach. Particularly, for the local responses that are mediated by activation of proteolytic and signaling pathways such as coagulation and inflammation, the relevant scale corresponds to the micrometer and nanometer dimensions of cells and macromolecules, respectively. There is very little information on the physicochemical characteristics of the skin at these scales.

Objective The investigators propose to analyze fresh human skin samples using several up-to-date technologies to obtain parameters on the mechanical, biochemical and structural distribution of the main components of the capillary-tissue unit.

Hypothesis/Rationale Our working hypothesis is that both structural components of the dermis, such as glycosaminoglycans, and key mediators of homeostatic pathways, such as the procoagulant tissue factor are not evenly distributed along parallel planes. The investigators further hypothesize that the distribution patterns determine functional and mechanical differences along dermal layers.

Methods Using a dermatome, human skin will be dissected along planes parallel to the epidermis into several layers each approximately .0012mm thick. The layers will be analyzed with respect to composition of diffusible proteins and glycosaminoglycans; subjected to high resolution MRI and AFM scanning; and evaluated for swelling rate and equilibrium swelling pressure.

Significance This study will provide new information on material characteristics and functional structure of the human skin at resolutions relevant to the macromolecular and cellular processes that mediate local responses to injury and maintain local homeostatic mechanisms. The data will be further processed to obtain realistic parameters that are needed to develop predictive models of the skin capillary tissue unit. These models will bring new and deeper understanding on skin physiology and pathology and will aid in the discovery and testing of new preventive and therapeutic approaches targeting dysfunctions of the local homeostatic balance in the skin. Potentially, by exploiting the versatility of mathematical simulations in the skin model, the findings will also be applicable to other tissue organs.

• Study Type: Observational
• Enrollment (Actual): 35

Contacts and Locations

Study Locations

• United States
  • North Carolina
    • Winston-Salem, North Carolina, United States, 27157-1075
      • Wake Forest University School of Medicine, Department of Plastic & Reconstructive Surgery

Participation Criteria

Eligibility Criteria

• Ages Eligible for Study: 14 years to 61 years (Adult, Older Adult)
• Accepts Healthy Volunteers: No
• Genders Eligible for Study: All

• Sampling Method: Non-Probability Sample

Study Population

Study population consists of patients who are being seen in the Plastic & Reconstructive Surgery Clinic for surgical removal of excess abdominal skin (abdominoplasty).

Description

Inclusion Criteria:

• Subjects, male or female , between the ages of 18 to 65 years of age, who will be having surgery to remove excess skin from the abdominal area by surgeons in the Department of Plastic & Reconstructive Surgery

Exclusion Criteria:

• Subjects younger then 18 years of age or older than 65 years of age, and are not having excxess skin surgically removed

Study Plan

How is the study designed?

Design Details

• Observational Models: Case-Only
• Time Perspectives: Prospective

Collaborators and Investigators

• Sponsor: Wake Forest University
• Investigators: Principal Investigator: Michael J Morykwas, PhD, Wake Forest University Health Sciences

Study record dates

Study Major Dates

• Study Start: April 1, 2007
• Primary Completion (Actual): April 1, 2012
• Study Completion (Actual): April 1, 2012

Study Registration Dates

• First Submitted: February 10, 2011
• First Submitted That Met QC Criteria: February 10, 2011
• First Posted (Estimate): February 11, 2011

Study Record Updates

• Last Update Posted (Actual): November 6, 2017
• Last Update Submitted That Met QC Criteria: November 2, 2017
• Last Verified: December 1, 2015

More Information

Terms related to this study

• Keywords: structural analysis, diffusible proteins, glycosaminoglycans
• Additional Relevant MeSH Terms: Skin Diseases; Genetic Diseases, Inborn; Connective Tissue Diseases; Skin Diseases, Genetic; Cutis Laxa
• Other Study ID Numbers: IRB00002154