Immunotherapy Flashcards

1
Q

What are the 2 inhibitor checkpoint molecules that are used for therapy?

A

PD-1 and CTLA-4

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2
Q

Explain the MOA of PD-1 and CTLA-4.

A

They suppress stimulation of T-cells.
They are both expressed on T cells and NK cells.
PD-1 is also expressed by myeloid cells and by certain tumours.

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3
Q

Do cancer cells expression MHC I or II?

A
  • most tumours are generally MHC II negative.
  • some are also MHC I negative to evade recognized by CD8+ cytotoxic T cells
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4
Q

What’s the MOA of myeloid derived suppressor cells?

A

the MDCS are recruited from the bone marrow normally by cytokines leased in inflammation. But can also be from the tumour.

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5
Q

Which are the major cytokines involved in the recruitment of MDSC during inflammation?

A
  • granulocyte-macrophage colony stimulating factor
  • IL-3
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6
Q

How does the tumour recruit MDSCs?

A

from multiple cytokines that are produced by tumours during hypoxia –> regulated by hypoxia inducible factor

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7
Q

What do the MDSCs do once they are in the tumour microenvironment?

A
  • They differentiate into neutrophils and macrophages and actively suppress local anti-tumour response.
  • potentiate Tregs
  • differentiate into tumour associated macrophages
  • They also produce metalloproteinases (MMPs)
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8
Q

How do tumour associated macrophage contribute to cancer progression?

A

it will stimulate tumour angiogenesis and promote metastasis

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9
Q

What’s produced by the MDSCs that can stimulate Tregs and differentiation of TAMs?

A

TGF-beta, and IL-10

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10
Q

What cytokine is involved in T cell activation?

A

IL-12, which is produced by TAMs to suppress T cell function

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11
Q

What else can lack of IL-12 and TGF-beta do in terms of immune suppression?

A

can cause NK anergy (lack of function)

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12
Q

What cell surface markers are expressed by Tregs?

A

CD4 and CD25

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13
Q

Which is the most specific marker for Tregs?

A

FoxP3, it’s an intracellular transcription factor

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14
Q

What are the actions of Tregs on the immune system?

A

can directly suppress CD4+ and CD8+ T cells, and NK cells

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15
Q

How does Tregs convert CD4+ cells to Tregs?

A

by locally produced IL-6, the TGF-beta

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16
Q

Which chemo drugs have shown to decrease Tregs?

A

cyclophosphamide
toceranib

17
Q

What happens if there is an impairment of dendritic cell function?

A

less antigen presentation and stimulation of T cells –> T cell tolerance rather than activation

18
Q

What are a few key immunosuppressive cytokines produced by the tumour cells?

A
  • IL-10: Treg production and function
  • VEGF
  • TGF-beta: similar to IL-10; EMT
  • TNF-alpha: induction of anti-apoptotic factors; promote angiogenesis and metastasis and hamper cytotoxic T cell and macrophage response
19
Q

Which cytokines are related to anti-tumour immunity?

A

IL-12, IL-2, IL-3, IFN-gamma

20
Q

How do MDSCs suppress T cells, NK cells, and dendritic cells?

A

Production of NO and ROS

21
Q

What co-inhibitory surface molecules can tumour cells express to evade the immune system?

A

PD-L1/ CD73

22
Q

What’s the outcome of liposome-encapsulated muramyl tripeptide for canine OSA, HSA, and MM?

A

OSA: no statistical difference in survival
HSA: better (DFI, and OS, 9m vs 5.7m)
MM: no statistical difference in DFI; but stage I had sig longer ST

23
Q

What’s the response of Oncept IL-2 for FISS?

A

significantly longer mDFI (>730 days) compared to control group (287 days)

24
Q

Can Oncept be used in cats?

A

yes, safe with minimal risks

25
Q

What’s the outcome of canine cortical allograft for OSA that get infection versus not?

A

MST 685 days vs 289 days

26
Q

Is there a difference in survival if there is infection at the site of OSA amputation site in dogs?

27
Q

What are the functions of TAMs?

A
  • IL-10 and TGF-β: increases & potentiates Tregs
  • Produces NO, and reactive oxygen: Suppressed dendritic cells, NK cells, T cells
  • MMP production: first step of metastatic cascade –> Angiogenesis