BC #12 tumor progression.txt

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Author:
kepling
ID:
60988
Filename:
BC #12 tumor progression.txt
Updated:
2011-01-20 18:38:32
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BC tumor progression
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BC #12 tumor progression
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  1. Are oncogenes gain or loss-of-function?
    GOF
  2. Does a GOF function dominantly or recessively?
    Dominant
  3. How does the RAS oncogene function?
    • RAS generally binds GTP to activate growth
    • After time, RAS is hydrolyzed by GAP (like NF1) to hydrolyze GTP and inactivate
    • When RAS is an oncogene, it cannot hydrolyze the GTP so it is always on, even in the absence of a mitogen
  4. How does MYC act as an oncogene?
    • MYC is not mutated
    • 1) Active promoter: more transcription of MYC RNA
    • 2) Increased gene copies: multiple on one chromosome, MYC gene amplified
  5. What is Burkitt's lymphoma?
    • ***Ebstein-barr virus, HIV
    • translocation b/t chromo. 8 &14
    • 14 has an active promoter
    • Transcription increased from single gene
  6. How does MYC amplification work?
    • DNA problems can cause multiple MYC genes to appear on chromosomes
    • Normal mRNA but from multiple genes (leads to more protein)
  7. What is the philadelphia chromosome?
    chromosome 9 and ABL coming together with chromosome 22 and BCR
  8. What does the Philadelphia Chrom. produce? How?
    • CML (leukemia)
    • ABL is generally a tyrosine kinase
    • When ABL-BCR the TK is constantly active
  9. What is clonal expansion?
    • Mutated cells replicating self
    • over time causes higher mutations and more chance of cancer
  10. What are the 3 phases of tumor growth?
    • 1) initiation
    • 2) promotion
    • 3) pogression
  11. What is 1) initiation?
    mutation with potential
  12. What is 2) promotion?
    proliferation of mutated cells only (not normal cells)
  13. What is 3) Progression?
    • oncogene + inactivated tumor suppressor
    • benign to malignant
    • No tumor promoter required
  14. Initiation or Promotion: Cigarette Smoke and Alcohol??
    • Cigarette Smoke: initiator
    • Alcohol: promoter
  15. What causes Angiogenesis?
    • Cell lacks oxygen and nutrients
    • Releases growth factors (VEGF)
  16. When is a tumor malignant?
    When it has chewed through the basal lamina and began to protrude into underlying tissue
  17. What chemical is used by the malignant tumor to chew through the basal lamina?
    Matrix Metalloproteinases (MMP)
  18. How does a cell travel to a new place? (Seed and Soil)
    • Initiate, Promote, and Progress
    • MMP to break basal lamina
    • enter blood and lymph
    • MMP to break into new cell
    • **Certain cells are very picky about their soil so they only metastasize to certain places.

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