The Cell Cycle and Cancer

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Presentation transcript:

The Cell Cycle and Cancer

The Check points of the G1 and G2 phases assure a cell divides correctly. 1.Before a cell divides, the DNA is checked to make sure it has replicated correctly. (If DNA does not copy itself correctly, a gene mutation occurs. DNA replication animation:click on DNA picture

Chemical Signals in these phasescan tell a cell when to start and stop dividing. (Target cells animation: click on go sign)

Also…..Neighboring cells communicate with dividing cells to regulate their growth, to prevent too many cells in one area. (Normal contact inhibition animation: click on petri dish)

Cancer is a disease of the cell cycle Cancer is a disease of the cell cycle. Some of the body’s cells divide uncontrollably and tumors form. Tumors in Liver Tumor in Colon

DNA mutations disrupt the cell cycle. Mutations may be caused by: 1. radiation 2. smoking 3. Pollutants 4. chemicals 5. viruses

While normal cells will stop dividing if there is a mutation in the DNA, cancer cells will continue to divide with mutation.

Due to DNA mutations, cancer cells ignore the chemical signals that start and stop the cell cycle. 2 animations of cancer cells dividing: click on picture

And…. cancer cells cannot communicate with neighboring cells And…. cancer cells cannot communicate with neighboring cells. So these cells continue to grow and form tumors. Skin cancer (cancer cells dividing: click on picture.)

SUMMARY Normal Cell Division DNA is replicated properly. 2. Chemical signals start and stop the cell cycle. 3. Cells communicate with each other so they don’t become overcrowded. Cancer Cells Mutations occur in the DNA when it is replicated. 2. Chemical signals that start and stop the cell cycle are ignored. 3. Cells do not communicate with each other and tumors form.

Treating Cancers Cancer treatments include drugs (chemotherapy) that attack the rapidly dividing cells and can stop cancer cells from going through the cell cycle.

CANCER PRESENTATIONS

Get in groups of 4 Pick a Cancer off of the list that is of interest to you as a group. Look at the grading rubric and as a group write me a short paragraph on what each person in the group is doing After I get your roles…. Begin your research