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Summary
Researchers identified a new phospholipid exchange protein in rat intestines. This protein
Area of Science:
- Biochemistry
- Cell Biology
- Gastroenterology
Background:
- Phosphatidylcholine is a key phospholipid in cell membranes.
- Phospholipid exchange proteins facilitate the transfer of phospholipids between membranes.
Purpose of the Study:
- To characterize phospholipid exchange activity in rat intestinal homogenates.
- To identify and localize phospholipid exchange proteins within the intestine.
Main Methods:
- Differential centrifugation and pH fractionation of rat intestinal homogenates.
- Isoelectric focusing to separate proteins by charge.
- Assay of phosphatidylcholine exchange activity.
Main Results:
- Rat intestinal fractions stimulated phosphatidylcholine exchange.
- Two peaks of activity were observed after isoelectric focusing, suggesting two distinct proteins.
- A novel phospholipid exchange protein was identified with activity in the basic pH range.
- Phosphatidylcholine exchange activity was highest in the intestinal mucosa.
- Activity per mg of protein was not significantly altered by fasting or diet, nor different between villi and crypts or jejunum and ileum.
Conclusions:
- A novel phospholipid exchange protein exists in the rat intestine.
- Intestinal phospholipid exchange activity is primarily localized in the mucosa.
- Phospholipid exchange activity in absorptive cells does not appear to be a rate-limiting factor in fat absorption.