Age-Related Changes in Myosin Heavy Chain Composition in Human Orbicularis Oculi Muscle
| Tracking Information | |||||
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| First Received Date ICMJE | September 9, 2005 | ||||
| Last Updated Date | September 9, 2005 | ||||
| Start Date ICMJE | January 2004 | ||||
| Primary Completion Date | Not Provided | ||||
| Current Primary Outcome Measures ICMJE |
Differentiation capability of preadipocyte | ||||
| Original Primary Outcome Measures ICMJE | Same as current | ||||
| Change History | No Changes Posted | ||||
| Current Secondary Outcome Measures ICMJE |
Proliferation capability of preadipocyte | ||||
| Original Secondary Outcome Measures ICMJE | Same as current | ||||
| Current Other Outcome Measures ICMJE | Not Provided | ||||
| Original Other Outcome Measures ICMJE | Not Provided | ||||
| Descriptive Information | |||||
| Brief Title ICMJE | Age-Related Changes in Myosin Heavy Chain Composition in Human Orbicularis Oculi Muscle | ||||
| Official Title ICMJE | Not Provided | ||||
| 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. |
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| 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. |
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| Study Type ICMJE | Interventional | ||||
| Study Phase | Phase 1 | ||||
| Study Design ICMJE | Allocation: Non-Randomized Endpoint Classification: Efficacy Study Intervention Model: Single Group Assignment Masking: Open Label Primary Purpose: Educational/Counseling/Training |
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| Condition ICMJE | Aging | ||||
| Intervention ICMJE | Procedure: obtain surgical specimen for analysis | ||||
| Study Arm (s) | Not Provided | ||||
| Publications * | Not Provided | ||||
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* Includes publications given by the data provider as well as publications identified by ClinicalTrials.gov Identifier (NCT Number) in Medline. |
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| Recruitment Information | |||||
| Recruitment Status ICMJE | Completed | ||||
| Enrollment ICMJE | 60 | ||||
| Completion Date | August 2004 | ||||
| Primary Completion Date | Not Provided | ||||
| Eligibility Criteria ICMJE | Inclusion Criteria:
Exclusion Criteria: - |
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| Gender | Both | ||||
| Ages | 20 Years to 80 Years | ||||
| Accepts Healthy Volunteers | Yes | ||||
| Contacts ICMJE | Contact information is only displayed when the study is recruiting subjects | ||||
| Location Countries ICMJE | Not Provided | ||||
| Administrative Information | |||||
| NCT Number ICMJE | NCT00154453 | ||||
| Other Study ID Numbers ICMJE | 9261701166 | ||||
| Has Data Monitoring Committee | Not Provided | ||||
| Responsible Party | Not Provided | ||||
| Study Sponsor ICMJE | National Taiwan University Hospital | ||||
| Collaborators ICMJE | Not Provided | ||||
| Investigators ICMJE |
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| Information Provided By | National Taiwan University Hospital | ||||
| Verification Date | October 2003 | ||||
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ICMJE Data element required by the International Committee of Medical Journal Editors and the World Health Organization ICTRP |
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