Age-Related Changes in Proliferation and Differentiation Capacity of Human Preadipocytes From Periorbital Fat.

Study Overview
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Brief Summary
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Periorbital rejuvenation has been an issue of great interest in plastic surgery. Adipose tissue plays an important role in the periorbital anatomy, and has a great impact on the aging process of the region. We believe age-related atrophy of the facial adipose tissue may be related to the decreased proliferation and differentiation capability of the preadipocytes (adipose precursor cells).

Detailed Description
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Understanding the age-related changes in periorbital adipose tissue is crucial for improving current rejuvenation techniques, or developing new ones. However, no such study has been reported in the literature. 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 pretarsal fat can be easily obtained from patients of various ages. This study is designed to objectively evaluate the age-related changes of the preadipocytes in human periorbital adipose tissue regarding their proliferation and differentiation capability. The adipose samples taken during the surgery are sent to the lab immediately to separate the preadipocytes from the specimens. Their number is estimated under the microscope, and then the cells are cultured in vitro to evaluate their proliferation and differentiation capability. Proliferation is assessed by counting the number of preadipocyte everyday for 7 days, and differentiation is assessed by Glycerol-3-phosphate dehydrogenase (GPDH) assay. A linear regression analysis is used to analyze correlations of the parameters with age. Moreover, by dividing the subjects who had their periorbital fat sampled during upper blepharoplasty operation into three age groups, the parameters are compared with ANOVA test. Therefore, the age-related changes of the proliferation and differentiation capability of the preadipocytes in human periorbital adipose tissue can be concluded.

Conditions
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Aging

Intervention / Treatment
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* Procedure: obtain surgical specimen for analysis


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: patients receiving lower blepharoplasty Exclusion Criteria: patients who do not require fat removal

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

Sexes Eligible for Study
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All

Accepts Healthy Volunteers
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Accepts Healthy Volunteers

Study Plan
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How is the study designed?
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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?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| preadipocyte proportion in aged versus young group |  |  |