Trigger 5: mediators fo B cell death Flashcards

1
Q

which virus’ have been specifically implicated

A

enterovirus’

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2
Q

how common are enterovirus’

A

the most common in the world

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3
Q

enterovirus’ are a group of virus’ which cause

A

mild infectious disease

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4
Q

name two enterovirus’ which are more severe illness

A

cocksakievirus, polio, hand, foot and mouth disease

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5
Q

symptoms of enterovirus

A

variable- usually no symptoms.

  • mild respiratory symptoms
  • flu-like illness
  • muscle ache
  • rash
  • gastrointestinal symptoms
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6
Q

How do you catch an enterovirus?

A

Spread either by coming into contact with secretions, like saliva, sputum or mucus, from an infected person or with their faeces.

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7
Q

individuals most at risk of entersvirus’

A

Children, pregnant women, newborns and people who are malnutritioned

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8
Q

treatment for enteroviral infction

A

Usually patients recover by themselves.

Treatment usually focuses on relieving symptoms and hydration.

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9
Q

when are antibiotic necessary for enteroviral infection

A

Anti-biotics are only given if a secondary bacterial infection occurs.

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10
Q

how are proposed diabetes causing viruses idnetified

A
  • blood tests
  • twin studies
  • case control (props fro decease patients)
  • animal models
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11
Q

how can viral infections be detected

A
PCR
Sequencing
Immunofluorescence assay 
ELISA
Hemagglutination assay
Electron microscopy (not used)
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12
Q

alpha cells

A

¥ trigger a more efficient antiviral response than β cells following infection with diabetogenic viruses, thus enabling α cells to eradicate viral infections without undergoing apoptosis

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13
Q

staining shows that islets of langerhans interact with immune cells in an

A

non-uniform manner

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14
Q

immune cells should

A

NOT BE PRESENT IN THE PANCREAS

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15
Q

immune cells are not present within the pancreas within

A

healthy people- therefore can deduce its an immune mediated process

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16
Q

which enterovirus’ are implicated

A

cocksackie (seasonal)
mumps
rubella

17
Q

acute viral infection

A

is characterized by rapid onset of disease, a relatively brief period of symptoms, and resolution within days.

18
Q

acute trial infection accompanied by

A

early production of infectious virions and elimination of infection by the host immune system.

19
Q

example of virus which causes acute infection

A

influenza and ebola

20
Q

often acute infections cause

A

little or no clinical symptoms

21
Q

persistent viral infections last for

A

long periods

22
Q

why do persistent viral infections occur

A

due to the primary infection not being cleared by the adapt immune resonse

23
Q

examples of persistent infections

A

Varicella-zoster virus, measles, HIV-1, man cytomegalovirus

24
Q

a chronic infection is a

A

type of persistent infection that is eventually cleared

25
Q

key host features

A
  • reduces host defence

- ability of virus to kill cells

26
Q

name a common enterovirus capsid protein

A

VP1

27
Q

VP1 has been detected

A

immunologically in the islet cells of patient with recent onset t1 diabetes at a much higher frequency than i age matched controls

28
Q

immunostaining shows that islet cells are susceptible to

A

the virus- V1

29
Q

usually viral infection is

A

systemic

30
Q

virus’ associate with T1D

A

very few islet infected

31
Q

scientists have hypotheses as that induction and activation of viral sensors and viral response pathways…

A

may generate a specific footprint within islet cells

32
Q

virus’ which case t1D are only ever found in

A

insulin producing cells and never alpha- B-Cell Selectie

33
Q

which viral sensors may become activated in infected viral cells (immunopositive VP1)

A
  • protein kinase R
  • Mda5
  • RIG-1
  • TLRs
34
Q

which viral sensor causes translation arrest

A

Protein kinase R

35
Q

which viral sensor causes interferon expression

A

Mda5, RIG-1, TLRs

36
Q

VP1 immunoposiitvity is restricted sole to

A

beta-cells within islet

37
Q

expression of what is increased in islets that are immunopositive for VP1

A

protein kinase R (PKR)

38
Q

PKR production is increased in

A

VP1 immunopositive B cells

39
Q

PKR causes

A

translational arrest