Age-Related Changes in Myosin Heavy Chain Composition in Human Orbicularis Oculi Muscle

Study Overview
=================
Brief Summary
-----------------
Orbicularis oculi muscle is a key structure in the peri-orbital anatomy and is responsible for the major changes of aging in this area. Peri-orbital rejuvenation has been an issue of great interest in plastic surgery. We believe that understanding the age-related histomorphometric changes in orbicularis oculi muscle is important for improving the current rejuvenation techniques or developing the new ones. Nevertheless, a study focusing on this topic has never been performed before, simply because it is difficult and dangerous to perform needle biopsy on orbicularis oculi muscle.

Detailed Description
-----------------
Hundreds of people came to our hospital requesting upper blepharoplasty every year. Taking advantage of the discarded soft tissue in the blepharoplasty surgery, samples of bilateral orbicularis oculi muscle can be easily obtained from patients of various ages. This study is designed to objectively evaluate the age-related changes in human orbicularis oculi muscle by analyzing the composition of isoforms of myosin heavy chain (MHC), which is the predominant protein in skeletal muscle. MHC isoforms exist in different types of muscle fibers, and determines the maximum contraction speed of the muscle fiber. Therefore, The composition of MHC isoforms represents the composition of different types of muscle fiber. These muscle specimens are stored with liquid nitrogen right after surgery. In the lab, the specimens are sectioned to 40μm in thickness, and soaked in special buffer solution. After electrophoresis and staining, bands of different types of MHC can be visualized. The gel is scanned and processed with an image analysis system. The density of each band can be determined, and the ratio of the different types of MHC can be calculated. By dividing the subjects who had their orbicularis oculi muscle sampled during upper blepharoplasty operation into age groups of 20, 30, 40, 50, 60 and 70 years, these MHC subtypes composition ratios can be compared among the different groups. Therefore, the age-related changes of the composition of different muscle types can be concluded.

Conditions
-----------------
Aging

Intervention / Treatment
-----------------
* Procedure: obtain surgical specimen for analysis


Participation Criteria
=================
Eligibility Criteria
-----------------
Inclusion Criteria: patients receiving blepharoplasty Exclusion Criteria: -

Ages Eligible for Study
-----------------
Minimum Age: 20 Years
Maximum Age: 80 Years

Sexes Eligible for Study
-----------------
All

Accepts Healthy Volunteers
-----------------
Accepts Healthy Volunteers

Study Plan
=================
How is the study designed?
-----------------

Design Details

Primary Purpose: Educational/Counseling/Training
Allocation: Non-Randomized
Intervention Model: Single Group Assignment
Masking: None (Open Label)


Arms and Interventions

| Intervention/Treatment |
| --- |
|Procedure: obtain surgical specimen for analysis|nan|

What is the study measuring?
-----------------
Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Differentiation capability of preadipocyte |  |  | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Proliferation capability of preadipocyte |  |  | 

 Terms related to the study
=================
Keywords Provided by Centre Hospitalier Valida
-----------------
Aging, Orbicularis oculi, Blepharoplasty, Myosin heavy chain (MHC)