Related Experiment Videos
Analysis of cholesteryl ester transfer activity in adipose tissue
G X Shen1, J Y Zhang, R Blanchard
1Department of Internal Medicine, University of Manitoba, Winnipeg, Canada.
Summary
Adipose tissue secretes cholesteryl ester transfer protein (CETP), mediating cholesterol transport. Measuring CETP activity in adipose tissue reliably indicates its secretion and storage, crucial for reverse cholesterol transport.
Area of Science:
- Lipid metabolism and cardiovascular research.
- Biochemistry of lipoprotein interactions.
Background:
- Cholesteryl ester transfer protein (CETP) facilitates cholesteryl ester (CE) transfer between lipoproteins, vital for reverse cholesterol transport.
- Adipose tissue is a key site for cholesterol storage and lipoprotein metabolism.
Purpose of the Study:
- To investigate CE transfer activity in cultured adipose tissue.
- To determine if adipose tissue secretes CETP and if its activity can be measured.
- To correlate adipose tissue CETP activity with CETP mass.
Main Methods:
- In vitro CE transfer assay using cultured adipose tissue from humans, hamsters, and CETP transgenic mice.
- Inhibition studies using monoclonal antibodies against human CETP.
- Assay of CE transfer activity in adipose tissue homogenates and conditioned media.
Main Results:
- Significant CE transfer activity was detected in conditioned media of cultured adipose tissues.
- CETP activity varied by species and adipose region, and was inhibited by anti-CETP antibodies.
- Increased CE transfer activity in media correlated with decreased tissue activity and increased CETP mass.
Conclusions:
- Adipose tissue actively secretes CETP, contributing to CE transfer.
- Measuring CE transfer activity in adipose tissue is a reliable method to assess CETP secretion and storage.
- These findings highlight adipose tissue's role in cholesterol homeostasis.