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Real-time Imaging of Myeloid Cells Dynamics in ApcMin/+ Intestinal Tumors by Spinning Disk Confocal Microscopy
Published on: October 6, 2014
Spindle misorientation in tumors from APC(min/+) mice
Elizabeth S Fleming1, Maura Temchin, Qian Wu
1Center for Molecular Medicine, University of Connecticut Health Center, Farmington, Connecticut, USA.
Molecular Carcinogenesis
|January 6, 2009
Summary
Adenomatous polyposis coli (APC) gene mutations disrupt mitotic spindle orientation in intestinal cells, increasing angles in tumors. This APC mutation-specific misorientation may drive early cancer development and tissue disorganization.
Area of Science:
- Cell Biology
- Cancer Research
- Genetics
Background:
- The adenomatous polyposis coli (APC) gene is frequently mutated in colon cancers, potentially initiating tumorigenesis through various mechanisms.
- Previous studies indicated abnormal mitotic spindle orientation in normal tissues of APC-mutant mice.
Purpose of the Study:
- To investigate the impact of APC mutation on mitotic spindle orientation within intestinal tumors.
- To elucidate the underlying mechanisms of APC-driven spindle misorientation.
Main Methods:
- Three-dimensional reconstruction of confocal stacks using microtubule immunofluorescence imaging.
- Quantitative measurement of mitotic spindle angles in intestinal crypts and tumors from APC mutant mice.
Main Results:
- Spindle angles were significantly increased in intestinal crypts and tumors from APC mutant mice compared to wild-type controls.
- Abnormal beta-catenin staining was observed in APC mutant tissues, suggesting its potential involvement in spindle orientation.
- Spindle orientation in colon tumors with wild-type APC was normal, confirming specificity to APC mutation.
Conclusions:
- APC mutation leads to specific mitotic spindle misorientation in intestinal cells and tumors.
- Loss of astral microtubules is unlikely to be the primary cause of misorientation.
- Spindle misorientation may contribute to tissue disorganization during early stages of tumor formation, offering insights into carcinogenic events.
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