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Published on: November 14, 2016
Immunoelectron microscopic localization of lactase-phlorizin hydrolase in rat small intestine
Insights
This study reveals lactase-phlorizin hydrolase moves through rat jejunum lateral membranes to reach microvilli. This suggests an alternative intracellular transport pathway for this important digestive enzyme.
Area of Science:
- Cell Biology
- Gastroenterology
- Enzymology
Background:
- Lactase-phlorizin hydrolase is a key enzyme in intestinal carbohydrate digestion.
- Understanding its intracellular transport is crucial for comprehending digestive processes.
Purpose of the Study:
- To investigate the intracellular translocation pathway of lactase-phlorizin hydrolase in rat jejunum.
- To identify potential alternative routes for enzyme transport.
Main Methods:
- Immunoelectron microscopy was employed on rapidly embedded Lowicryl K4M sections of rat jejunum.
- Localization of lactase-phlorizin hydrolase immunoreactivity was assessed.
Main Results:
- Lactase-phlorizin hydrolase was found in microvillous membranes and apical vesicles.
- Significant immunoreactivity was also detected in the lateral membranes of jejunal cells.
Conclusions:
- The lateral membranes represent a potential alternative route for the intracellular transport of lactase-phlorizin hydrolase.
- This finding offers new insights into the trafficking of digestive enzymes within the enterocytes.
Abstract:
To provide insight into the intracellular translocation of lactase-phlorizin hydrolase, an immunoelectron microscopy was performed on rapidly embedded Lowicryl K4M sections of rat jejunum. Lactase-phlorizin hydrolase immunoreactivity was detected not only in the microvillous membranes and in the smooth apical vesicles, but also in the lateral membranes, suggesting an alternative route for intracellular transport of lactase-phlorizin hydrolase via the lateral membranes to the microvilli.
