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Induced morphological changes in isolated microvilli: regulation of membrane topology in vitro by submembranous
Abstract:
We have investigated the effects of treating isolated microvilli with 1 mM ATP, 5 mM CaCl2, and 25 mM MgCl2 in terms of the morphological changes induced and the solubilization of cytoskeletal proteins. Neither ATP nor MgCl2 treatment alone induced significant morphological changes, despite some solubilization of cytoskeletal proteins; yet combined ATP and MgCl2 treatment resulted in "beading" of the membrane and some loss of membrane from the basal end of the structures. CaCl2 treatment resulted in a very regular beading of the microvillus membrane together with partial disassembly and solubilization of the core. These changes could be induced by free Ca++ in the micromolar range, which therefore suggests that they may be of physiological importance. Induced morphological changes are discussed in terms of the effects of these treatments on the microvillus cytoskeleton.
Insights
Calcium chloride (CaCl2) treatment significantly alters microvillus morphology and cytoskeleton, suggesting physiological relevance for calcium ions in microvillus structure regulation.
Area of Science:
- Cell Biology
- Biochemistry
- Cytoskeleton Dynamics
Background:
- Microvilli are crucial for nutrient absorption and cell signaling.
- The role of specific ions and ATP in microvillus structural integrity is not fully understood.
Purpose of the Study:
- To investigate the effects of ATP, CaCl2, and MgCl2 on isolated microvilli.
- To determine the impact of these treatments on microvillus morphology and cytoskeletal protein solubilization.
Main Methods:
- Isolated microvilli were treated with ATP, CaCl2, and MgCl2.
- Morphological changes were observed.
- Solubilization of cytoskeletal proteins was quantified.
Main Results:
- ATP and MgCl2 alone caused minor cytoskeletal protein solubilization but no significant morphological changes.
- Combined ATP and MgCl2 induced membrane beading and basal membrane loss.
- CaCl2 treatment led to regular membrane beading and core disassembly, suggesting physiological relevance of micromolar calcium levels.
Conclusions:
- Calcium ions play a significant role in regulating microvillus morphology and cytoskeletal organization.
- The observed changes suggest potential physiological mechanisms involving calcium in microvillus function.