topic 4.2: chronic inflammation Flashcards

1
Q

what occurs during chronic inflmmation (overview of chronic inflammation)

A

invloves active inflammation, tissue injury and healing proces simulatenously

tissue destruction induced by products of inflammatory cells (eg proteases)

tissue repair/healing process: fomration of fibrorus tissue, new vessel proliferation

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2
Q

overview of chronic inflmmation

A

-slow preogression
-persistant inflammation response for longer than 10-14 days (acute inflmmation), up to a year or more
-non exudative
-active inflammation, tissue injury and healing procress simulatenously
tissue destruction: induced by products of inflmmatory cells
tissue repair: formation of fibrous tissues, new vessle proliferation
major cells invloved: macrophage, lymphocytes , plasma cells

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3
Q

what causes chronic inflmmation

A

unresolved accute inflmmation (acute inflammation progressing to chronic inflmation)

-persistent infections (microbes that are difficult to eradicate) (body stuck in a cycle of destruction and repair)

-harmful stimulus that tirggers a chronic inflmmatory response from the onset (eg viral infections, autoimmune disease) (eg straight away go into chronic inflmmation)

prolonged exposure to toxic agents eg. atherosclerosis – chronically elevated plasma lipids (toxic agent) (too long, body have to keep fighting)

PPUH: persistant infection, prolonged exposure to toxic agent, unresolved acute inflammation, harmful stimulus that triggers chronic inflammatory response from its onset

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4
Q

what are the two examples of hypersentivity rxns/types we learn about

A

glomerulonephritis and vasculitis

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5
Q

tell me about the mechanism of glomerulonephritis

A

what is glomerulonephritis: inflammation of the glomeruli in the kidney

cause: consequence of some other disease, such as infection/cancer. many dogs with glomerulonephritis, the trigger cannot be determined

mechanism: immune complexes (antinody-antigen complex) become trapped in the glomeruli-> activation of the body’s inflmmatory defence system-> damages the glomeruli

immune complex deposition in gomeruli-> basement membrane thicend and stimulates glomerlar cells to proliferate (form new cells) -> form lesions-> this it is called Membranoproliferative glumerulonephritis

any or all of the three glomerular cells populations-epithelail,enodthelial and mesangial cells can proliferate

MPGN lesion are classified into three types (I, II & III) based on histopathology &
pathogenesis.

impact of glomerulonephritis: protein in the urine during a urine test is the first indication

treatment: 1.treating any underlying disease
2.reducing the amount of protein lost in the urine
3.managing existing kidney disease
4.giving and immunosuppressive drugs to reduce the formation of immune complexes

untreated-> chronic kidney failure

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6
Q

what is glomerulonephritis

A

inflmammation of the glomeruli in the kidneys

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7
Q

explain the mechanism of glomerulonephritis

A

-the inflammation develops when immune complexes (antibody and antigen) become trapped in the gloeruli (too big, cannot come out) (actually not harmful but immune system mistake it to be harmful-> hypersitivity)
- this leads to activation of the bodys inflmmatiory defense system (to clear the complexes) which in turns damages the glomeruli
- also the immune complex deposition in the glomeruli cause basement membrane thickening and stimulate gommerular crlls to proliferate
- any or all three of the glmerular cell population- epithelial, enodthelial and mesangial cells can proliferate
- the formation of lesions therefore called Membranoproliferative glumerulonephritis (MPGN).
- MPGN lesions are classifyed into three types (I, II,III) based on histophathology (tissue) and pathogenesis (process)

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8
Q

causes of immune complex formation on glomerulonephritis

A

formed as a consequence of some other disease (eg infection, cancer)
however, many dogs with glomerulonephritis, the triggers cannot be determiend

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9
Q

result of glomerulonephritis

A

results in excessive loss of protein in urine (proteinuria)

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10
Q

testing for glomerulonephritis

A

protein in the urine during a urine test may be the first indication that dogs has glomerulonephritis

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11
Q

treatment of glomerulonephritis

A

-treating any underlying diseases
-reducing amt of ptotein lost in urine
-managing existing kidney disease
-giving immunosupressive drugs to reduce the formation of the immune complees

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12
Q

effect of not treating glumerulomephritis

A

can lead to chronic kidney failure

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13
Q

tell me about vasculitis

A

what is vasculitis: inflmmation of the blood vessles casued by immune complexes (rem immune complex cause other cells to come to clear it-> inflmmation-> hence inflmmation of the blood vessels)

causes: drugs are a frequent cause of vasculitis in dogs

signs: skin abnormalities are seen as purplish red dots, (bleeding under the skin) ulcerations (sores/wonds) and scabs (crust-due to healing)

where: depending on which blood vessles invloved, signs appear on the lower leg, paws, ears, mouth or tongue

diagnosis: The disorder is diagnosed by performing tests on samples removed from the affected areas (biopsies)

treatment: Vasculitis is treated by stopping the offending drug (if implicated as the cause) or by giving drugs that suppress the immune system (reduce the formation of complexes causing the imflammtion)

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14
Q

what is vasculitis

A

inflammation of the blood vessels caused by immune complexes occuring in dogs

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15
Q

what are the clinical signs of vasculitis

A

skin abnormalities are seen as purplish red dots, ulcerations and scabs .
depending on which blood vessels are invloved, signs appear on lower legs, paws, ears, mouth or tongue

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16
Q

cause of vasculitis

A

drugs are a frequent cause of vasculits

17
Q

what are the test done to confirm vasculitis

A

performing tests on samples removed from the affected area (biopsies)

18
Q

treatment of vasculitis

A

stopping the offending drug (if it is the cause)
or giving drugs to supress the immune system

19
Q

what cells are invloved in chronic inflammation

A

macrphage
lymphocytes
eosinophils

20
Q

charactersitics and function of machropage in chronic inflmmation

A

Dominant cells of chronic inflammation.
- Blood monocytes (og form of cell when in blood)→ (migrate to tissues) →macrophage

  • Phagocytes
  • When activated: increased cell size,
    lysosomal enzyme content & phagocytic
    capacity. (better able to recognise and engulf pathogens)
  • H&E stain: large, flat, pink
  • function: Activated macrophages secrete products
    that cause tissue injury & inflammation
    (eg. proteases, cytokines) and fibrosis (eg.
    growth factors)
  • Can be stimulated by lymphocytes to fuse
    into large, multinucleated giant cells
    (MNGC) (response in chronic inflamation) (bigger cells, more powerful phagocytic capabilities)
21
Q

```

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function and characteristics of lymphocyte in chronic inflmmation

A

Macrophages and lymphocytes interact in a
bidirectional way that sustain chronic
inflammation. (keep activating each other)
➢ Macrophage stimulate T cell response
by displaying antigens.
➢ Activated T cells produce cytokines that
activate macrophages
Plasma cells (from activated B cells)
produce antibodies directed against
persistent antigens.

crucial to sustain chronic inflammation, eg chronic inflammation

22
Q

function and characteristic of eosinophils in chronic inflmation

A

Usually found in parasitic or allergic
inflammatory sites

23
Q

what are the two main types of chronic inflmmation

A

non-granulomatous and granulomatous

24
Q

how does non granulomatous chronic inflmation look like under the microscope

A

Microscopically: Loose clusters of inflammatory cells with no particular arrangement.
* Macroscopically: Variable (could be either) background of fibrosis, or reactive hyperplasia or hypertrophy in surrounding tissues.
*
* Eg: Chronic inflammation of skin – skin thickens, become greasy because of hyperplasia of skin
glands; chronic inflammation of gut – wall is thicker than normal.

25
Q

what does granulomatous chronic inflamation look like under the microscope (microscopincally)

A

Distinct arrangements of inflammatory cells – ‘granulomas’
* (Microscopically) Granulomas = central aggregates (clumping) of macrophages with mononuclear (lymphocyte, plasma cells) inflammatory cells clustered around the macrophages, and a rim of fibrous tissue around the outside. (macrophage, mononuclear cells and then fiborous tissue)

May be present (microscopically):
* Multinucleated giant cells = fusion of macrophages (due to lymphocytes)
* Neutrophils + macrophages in the centre of granulomas → known as pyogranulomatous (seen in feline infectious peritonitis, FIP).

26
Q

what does granulmatous chronic inflmation look lole macrscopically

A

Single, large, visible lumps (the granulomas)
* Numerous, smaller lumps (tissue feels thickened and nodular)
* Formed when: cause of inflammation resists destruction (eg suture cannot be broken down) by inflammatory or immune mediated processes (attaching its own cell)

  • Eg. foreign material (suture, splinter); infectious organisms (bacteria with protective capsules eg
    tuberculosis, parasites with tough outer walls); hypersensitivity response.
27
Q

what are harmful effects of chronic inflmmation

A

1.Long term disease and lasting dysfunction of affected organ/tissue.
* Chronic nephritis → persistent renal disease
* Chronic enteritis → diarrhea, weight loss, inability to absorb nutrients efficiently.

2.Loss of organ/tissue function due to pain, swelling, fibrosis (scarring), discharge

3.Weight loss, persistent fever due to chronic effects of chemical mediators (porstaglandins)

  1. Changes in blood – increased leukocytes, globulins (producing antibodies), decreased RBCs (anaemia) (more energy for leuk poduction than RBC)