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The Spindle Assembly Checkpoint

The Spindle Assembly Checkpoint

The spindle assembly checkpoint is a molecular surveillance mechanism ensuring the fidelity of chromosome segregation during anaphase. The checkpoint monitors the completion of all the prerequisite steps before chromosome segregation to determine whether the segregation process should proceed or be delayed.
Many proteins function together to control the spindle assembly checkpoint. Mutations affecting these proteins may allow cells to proceed into anaphase prematurely, resulting in the...

The Spindle Assembly Checkpoint

The Spindle Assembly Checkpoint

The spindle assembly checkpoint is a molecular surveillance mechanism ensuring the fidelity of chromosome segregation during anaphase. The checkpoint monitors the completion of all the prerequisite steps before chromosome segregation to determine whether the segregation process should proceed or be delayed.
Many proteins function together to control the spindle assembly checkpoint. Mutations affecting these proteins may allow cells to proceed into anaphase prematurely, resulting in the...

Spindle Assembly

Spindle Assembly

Spindle assembly occurs through three, often coexisting, pathways – the centrosome-mediated pathway, the chromatin-mediated pathway, and the microtubule-mediated pathway – collectively contributing to form a robust spindle apparatus.
In most cells, centrosomes are the primary microtubule nucleation centers. In the centrosome-mediated pathway, the G2-prophase transition triggers centrosome maturation and increased microtubule nucleation. Progressive nucleation results in a microtubule array...

Abnormal Proliferation

Abnormal Proliferation

Under normal conditions, most adult cells remain in a non-proliferative state unless stimulated by internal or external factors to replace lost cells. Abnormal cell proliferation is a condition in which the cell's growth exceeds and is uncoordinated with normal cells. In such situations, cell division persists in the same excessive manner even after cessation of the stimuli, leading to persistent tumors. The tumor arises from the damaged cells that replicate to pass the damage to the daughter...

The Mitotic Spindle

The Mitotic Spindle

The mitotic spindle—or spindle apparatus—is a eukaryotic, cytoskeletal structure made up of long protein fibers called microtubules. Formed during cell division, the spindle separates sister chromatids and moves them to opposite ends of a parental cell, where the now individual chromosomes are distributed to two daughter cell nuclei.
The bipolar configuration of the mitotic spindle facilitates chromosomal segregation, preparing the cell for division. One mechanism that ensures bipolar mitotic...

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Related Experiment Videos

Spindle cell carcinoma in maxilla.

Soumi Samuel¹, S V Sreelatha, Nidarsh Hegde

¹Department of Oral & Maxillofacial Surgery, AB Shetty Memorial Institute of Dental Sciences, Mangalore, Karnataka, India.

BMJ Case Reports

|May 2, 2013

Summary

Spindle cell carcinoma, a rare variant of squamous cell carcinoma, presents aggressively in the head and neck. This case highlights the challenges in diagnosing and managing this uncommon maxillary tumor.

Area of Science:

Oncology
Pathology
Head and Neck Surgery

Background:

Spindle cell carcinomas (sarcomatoid carcinomas) are rare epithelial tumors mimicking sarcomas.
They are exceptionally uncommon in the head and neck, with only five maxillary cases reported.
This histology is associated with poor prognosis and advanced disease at presentation.

Observation:

A rare case of spindle cell carcinoma involving the maxilla is presented.
The tumor exhibited spindled cells of epithelial origin, simulating a sarcoma.
The patient presented with advanced disease, characteristic of this variant.

Findings:

Spindle cell carcinoma of the maxilla is associated with a poorer diagnosis than standard squamous cell carcinoma.
The rarity of this condition complicates standardized management protocols.

Related Experiment Videos

Surgical intervention and radiotherapy are the primary treatment modalities.

Implications:

Increased awareness and early detection are crucial for improving outcomes in maxillary spindle cell carcinoma.
Further research is needed to establish optimal treatment guidelines for this rare entity.
This case underscores the importance of considering sarcomatoid differentiation in head and neck squamous cell carcinomas.