Cancer as an Infectious Disease - Test 1 Flashcards

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1
Q

What was the conclusion from cancer research in the 1970s?

A
  • Virus-induced cancers represent only a minority of the cancer types affecting humans
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2
Q

What was cancer considered as?

A
  • A candidate for infectious disease
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3
Q

In 1911 what virus caused cancer in chickens?

A
  • Rous Sarcoma Virus (RSV)
  • A virus can transform a normal cell into a tumor
  • Rous’s protocol for inducing sarcomas in chickens
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4
Q

What were the two categories of disease in the 19th century?

A
  • Bacteria - trapped in pores upon filtration
  • Viruses - pass through filters
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5
Q

Density Dependant Inhibition (contact inhibition)

A

The behavior exhibited by cells propagated in monolayer culture reflects the halt in cell proliferation.

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6
Q

Anchorage dependence

A

Requirement of cells for tethering to a solid substrate before they will grow.

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7
Q

Cancer cells do not exhibit…

A
  • Anchorage Dependence
  • Density Dependence
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8
Q

Transformation

A
  • Process of converting a normal mammalian cell into a cell having some or many attributes of a cancer cell
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9
Q

Transfection

A
  • a procedure for introducing DNA or RNA molecules into cells which may thereafter be expresses transiently in such cells, in case of DNA, stably in such cells
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10
Q

Transduction

A
  1. [as in signal transduction]
  2. Process by which a gene is introduced into a cell, usually by a vector such as a viral vector.
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11
Q

Immortalization

A
  • Process whereby a cell population normally having limited reproductive potential acquires the ability to multiply indefinitely
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12
Q

Tumorigenicity

A

The ability of cells to serve as founders of new tumors is often gauged experimentally by transplanting cells into appropriate hosts.

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13
Q

Tumorigenic

A
  1. Referring to the ability of cells to form tumors when introduced into appropriate animal hosts
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14
Q

Tumorigenesis

A

The process of forming a tumor,often involving a succession of steps.

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15
Q

What becomes integrated into the chromosomes of infected cells?

A

Retroviral genomes

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16
Q

Provirus

A
  • a virus genome that is integrated into the DNA of a host cell.
17
Q

How does RSV transform cells?

A
  • It exploits a kidnapped cellular gene
18
Q

SRC gene

A
  • specifies the src protein which causes cell transformation
  • src was named to indicate its role in triggering the formation of sarcomas in infecting chickens
19
Q

Where were src sequences present?

A
  • In the genome of uninfected cells
20
Q

What does src possess the properties of?

A

It possesses the properties of a normal cellular gene
- The relation “created a revolution in thinking about the origins of cancer”

21
Q

What are tree ways that retroviruses contribute to tumorigenesis?

A
  • Carry an oncogene acquired from a cellular proto-oncogene precursor
  • Upregulate cellular porto-oncogenes through “insertional mutagenesis” thereby converting the port-onogene into an oncogene
  • Naturally carry oncogenes
22
Q

What classes of DNA viruses are able to induce cancer?

A
  • papilloma virus
  • polyomavirus
  • human adenovirus
  • herpesvirus
  • poxvirus
23
Q

DNA tumor virus genomes

A
  • integrate into host-cell chromosomal DNA which allows for transmission of viral DNA sequences
24
Q

T antigen

A

Tumor-associated protein

25
Q

SV40 large T antigen

A
  • Product of an early gene
  • Involved in viral genome replication and virion assembly
  • Capable of inducing malignant transformation of a variety of cell types largely through disrupting pRb and p53
26
Q

Gastric carcinoma

A
  • Bacterial Cancer -Most deaths resulting from stomach cancer are due to chronic infection by pathogenic strains of the common bacterium
27
Q

How does H. Pylori cause stomach cancer?

A
  • Chronic, long-term infections and associated inflammation
  • Cag pathogenicity island (PAI), carried by certain H. pylori strains, encodes the CagA protein.
    The bacteria inject CagA into gastric epithelial cells where it deregulates cellular signals resulting in transformation-related phenotypes
28
Q
A