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Flashcards in Overview of Organ Transplantation Deck (16)
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1

What is the culprit of hyperacute rejections?

Pre-existing circulating antibodies specific for graft antigens

2

How does inflammation occur in hyperacute rejection?

Antibodies bind and activate complement causing inflammation

3

Why do xenograft cells cause complement activation?

They do not have regulatory proteins able to inhibit complement activation

4

What cells are responsible for acute rejections?

CD8+
CTLs
CD4+

5

What cells are responsible for chronic rejections?

CD4+

6

What does acute rejection cause?

Inflammation

7

What does chronic rejection cause?

Concentric thickening of the vessels wall causing occlusion

8

What is direct allorecognition?

Donor dendritic cells (transferred inside the organ) present to the recipients T cells

9

What is indirect allorecognition?

Recipients own dendritic cells present to the recipients T cells

10

Two possible ways a T cell will recognized an allogeneic MHC molecule and think it's self?

1.) T cell recognizes the allogeneic MHC molecule whose structure resemble a self MHC + foreign peptide complex
2.) T cell recognizes structure formed by both the allogeneic MHC molecule and bound peptide

11

What occurs mainly in acute rejection?

Alloantibodies mainly damage graft vasculature

12

What occurs mainly in chronic rejection?

Alloantibodies mainly damage endothelial cells

13

What are minor histocompatibility antigens?

Non-MHC antigens but proteins that differ in allelic form such as blood cells that are seen as antigen in another person's body

14

When does a graft versus host disease occur?

When mature allogeneic T cells or their precursor are transplanted into a recipient

15

What occurs in a GVHD?

Transferred allogeneic T cells recognize recipient alloantigens and attack recipient tissues

16

Two types of GVHD?

Acute
Chronic