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CDL301 > Lectures 16 and 17 Atherosclerosis > Flashcards

Lectures 16 and 17 Atherosclerosis Flashcards

1
Q

When is inflammation good?

A

fighting against pathogens, parasites, tumours

wound healing

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2
Q

When is inflammation bad?

A 
myocardial reperfusion injury
atherosclerosis
IHD
rheumatoid arthritis
asthma
inflammatory bowel disease
shock 
excessive wound healing 
restenosis
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3
Q

What is modern day clinical problem with inflammation?

A

availability of antibiotics and advance trauma surgical techniques make the magnitude of inflammatory response a bigger treat than infection or injury

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4
Q

Define Atherosclerosis

A

chronic inflammatory disease influenced by many factors involving a vast array of inflammatory cells and cytokines

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5
Q

describe the pathogenesis of atherosclerosis

A

influenced by lifestyle and medical choices
influenced by the haemodynamics of the blood
can begin before birth and take years or decades to develop
symptoms often indicate advanced state of disease
beings with initial insult to artery wall

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6
Q

What are the non-modifiable risk factors of atherosclerosis?

A 
age
gender - male
genetics
inflammation
family history of CV disease
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7
Q

What are the modifiable risk factors of atherosclerosis?

A 
dyslipidaemia
diabetes
hypertension
obesity 
smoking/alcohol
stress
physical activity
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8
Q

Where are atherosclerotic plaques most likely to form?

A

peripheral and coronary arteries - at bifurcations

distribution impacted by haemodynamic factors

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9
Q

What is the mechanism that initiates atherosclerosis?

A

endothelial dysfunction
altered NO biosynthesis
accumulation of inflammatory cells

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10
Q

Give examples of atherosclerotic stimuli

How do they lead to atherosclerosis?

A 
adhesion - chemoattractants - transmigration of leukocytes
oxidised LDL (oxLDL) - engulfment by macrophages forming foam cells which release more pro-inflammatory cytokines
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11
Q

What cytokines are found in atherosclerotic plaques?

A 
IL-1, IL-6, IL-8
IFN-gamma
TGF-beta
MCP-1
PDGF
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12
Q

What is the process of atherosclerosis progression?

A

stage 1 - endothelial dysfunction, accumulation of lipid-laden macrophages with migrate into the vessel all (chemotaxis) and form foam cells (LDL engulfed) forming fatty streaks in the intimal layer - appear from 10 years old

stage 2 - intermediate lesions - foam cells and T-lymphocytes. VSMC migration into intima. platelet adhesion and aggregation to vessel wall. lipid transport in balance - LDL delivery and HDL removing cholesterol

stage 3 - added impetus needed - fibrous cap (collagen and elastin) with lipid core containing necrotic and apoptotic debris, SMCs, foam cells and macrophages

stage 4 - thinning of the cap, MMPs, weakening cap prone to rupture. may impeded blood flow.

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13
Q

What is the function of the reverse cholesterol transport pathway?

How does the reverse cholesterol transport work?

A

removes cholesterol from peripheral tissues and returns it to the liver
HDL contains apo-A1 particles that interact with ABC-A1 or ABC-G1 transport proteins in foam cells (macrophages) to adsorb cholesterol
mature HDL travels to liver to release cholesterol which is processes for excretion - indirectly or directly
HDL continues to recirculate

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14
Q

What is the difference between a ruptured and eroded plaque?

A

ruptured - thin fibrous cap, collagen-poor fibrous cap, large lipid core, many macrophages and fibrin-rich thrombus

eroded - proteoglycan and glycosaminoglycan rich, little-or-no lipid core, neutrophils and NETs, many smooth muscle cells and platelet-rich thrombus

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15
Q

What is the structure of lipoproteins?

A

central core of hydrophobic lipid - triglycerides and cholesterol
surrounded by hydrophilic coat - phospholipids, free cholesterol and apolipoproteins

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16
Q

What are the different classifications of lipoproteins?

What are the diameters of each lipoprotein class?

A

chylomicros - 100-1000nm
very-low density lipoprotein (VLDL) - 30-100nm
low density lipoprotein (LDL) - 20-30nm
high density lipoprotein (HDL) - 7-20nm

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17
Q

What apolipoproteins do each class of lipoproteins contain?

A

chylomicros - apoB-48
VLDL - apoB-100
LDL - apoB100
HDL - apoA1 and apoA2

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18
Q

What are the three lipoprotein transport pathways?

A

exogenous (dietary)
endogenous
reverse cholesterol

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19
Q

Describe the exogenous lipoprotein pathway

A

lipids are digested
chylomicrons assembled with apoB-48 and move into the liver then subsequently into the bloodstream
HDL donates apoC-II and apoE to form mature chylomicrons which activate lipoprotein lipase (LPL)
LPL catalyses a hydrolysis reaction releasing glycerol and fatty acids which can be absorbed by the tissue
remnants endocytosed and hydrolysed by lysosomes
chylomicron remnants taken up into the liver - cholesterol is stored and secreted into bile which can be oxidised into bile acids or converted into VLDL

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20
Q

What is the function of ApoC?

A

only bind to receptors found on adipose tissue

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21
Q

What is the function of ApoE?

A

only bind to receptors on hepatocytes

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22
Q

What is the endogenous lipoprotein pathway?

A

in liver - triglycerides and glycerol assembled with apoB-100 to form VLDL
HDL donates apoC-II and apo-E
apoC-II activates LPL causing hydrolysis of VLDL releasing glycerol and fatty acids which can be absorbed by adipose tissue and muscle
hydrolysed VLDL now called IDLs can be taken up into the liver, hydrolyses by hepatic lipase into LDL, or remain in circulation
IDLs return to the liver and are hydrolysed by hepatic lipase releasing glycerol and triglycerides leaving behind LDL

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23
Q

What is the indirect HDL cholesterol transport pathway?

A

cholesterol esters transfer to VLDL and LDL particles via cholesterol ester transport protein (CETP)
LDL binds to LDLR on the liver

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24
Q

What is the direct HDL cholesterol transport pathway?

A

Apo-A1 of HDL binds SRB1 receptor on liver
cholesterol transferred to liver
HDL recirculates

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25
Define Dyslipidaemia
abnormal amount of lipid in the blood
26
What is primary dyslipidaemia?
cause - combination of diet and genetics | usually polygenic but can be monogenic
27
What is secondary dyslipidaemia?
consequence of other conditions - diabetes, alcoholism, chronic renal failure, liver disease and administration of drugs
28
Give examples of drugs that cause secondary hyperlipidaemia
isotretinoin - treatment of severe acne tamoxifen ciclosporine protease inhibitors - HIV treatment
29
What are the dyslipidaemias Frederickson classifications?
``` Ia - familial hyperchylomicronemia Ib - familial apoprotein CII deficiency Ic IIa - familial hypercholesterolaemia IIb - familial combined hyperlipidaemia III - familial dysbetalipoproteinaemia IV - familial hypertriglyceridaemia V ```
30
Which dyslipidaemias raise the risk of atherosclerosis?
moderate risk - III and IV | high risk - IIa and IIb
31
What is the increased lipoprotein in different dyslipidaemias? How are they treated?
Ia, Ib and Ic - chylomicrons - diet control IIa - LDL - bile acid, resins, statins and niacin IIb - LDL and VLDL - statins, niacin and fibrate III - IDL - fibrate and statins IV - VLDL - fibres, niacin and statins V - VLDL and chylomicrons - niacin and fibres
32
What mutations cause FH?
LDLR gene mutation - encodes LDL receptor protein that removes LDL from circulation apo-B mutation - part of LDL that binds with the receptor
33
How does a LDLR gene defect affect CVD?
heterozygous - premature CVD age 30-40 | homozygous - severe CVD in childhood
34
What are the treatments for homozygous FH?
often don't respond to medical therapy | alternative treatments - LDL aphaeresis (similar to dialysis) or liver transplant
35
What are the main dyslipidaemia/atherosclerosis treatments?
statins - HMG-CoA reductase inhibitors fibrates inhibitors of cholesterol absorption PCSK9 inhibitor
36
Give examples of statins
HMG-CoA reductase inhibitors simvastatin, lovastatin, pravastatin - specific and reversible atorvastatin, rosuvastain - long-lasting inhibitors
37
What are the pharmacokinetics of statins?
short-acting given overnight to reduce peak cholesterol synthesis in the morning efficiently absorbed and extracted by the liver pre-systemic metabolism by cytochrome P450 and glucuronidation pathways
38
How do statins work?
decreases cholesterol synthesis and increased LDL receptor synthesis in liver increased LDLR causes increased LDL clearance from plasma into liver also reduce plasma triglycerides and increase HDL
39
How do statins affect lipidation?
statins inhibit the mevalonate pathway and as a result reduce lipidation
40
What effect does reducing lipidation have?
improved endothelial function reduced vascular inflammation reduced platelet aggregabaillity increased neovascularisation of ischaemic tissue increased circulating endothelial progenitor cells stabilisation of atherosclerotic plaque antithrombotic actions enhanced fibrinolysis inhibition of germ cell migration during development immune suppression protection against sepsis
41
Why is statin use not recommended during pregnancy?
HMG-CoA reductase is important for migrating primordial germ cells
42
What are the adverse effects of statins?
``` muscle pain (myalgia) GI disturbance increased [liver enzyme] in plasma insomnia rash angio-oedema (rare) skeletal muscle damage - rare and more common in patients with low lean body mass or uncorrected hypothyroidism - myositis and rhabdomyolysis (severe) ```
43
What is the problem with statins?
99.3% of statin-treated patients see no benefit - does it make the side effects worth it for low-risk patients? can slightly increase risk of developing diabetes - more common in women
44
What may future researchers like to study about the effect of statins?
the interaction of lifestyle and medication | statin users tend to consume more calories, gain weight and exercise less
45
Give examples of fibrates (fabric acid derivatives)
``` bezafibrate ciprofibrate gemfibrozil fenofibrate clofibrate ```
46
What is the pharmacology of fibrates?
activate of PPAR(-alpha) - induces transcription of genes that facilitate lipid metabolism (LDL, apoA-I, apoA-II) fibrates are metabolised by cytochrome P450 (CYP3A4)
47
What are PPARs?
peroxisome proliferator-activated receptors | which are IC receptor modulating carbohydrate and fat metabolism, and adipose tissue differentiation
48
What is the effect of fibrates overall?
markedly decrease circulating VLDL and so decrease triglyceride levels 10% reduction in LDL 10% reduction in HDL
49
When are fibrates prescribed?
only when statins or ezetimibe are not tolerated | combined with other treatments in severe cases
50
What are the adverse effects and disadvantages of fibrates?
mild stomach upset myopathy clofibrate - only give to patients with removed gall bladder combination with statin increases risk of muscle damage leading to kidney failure fibrates shouldn't be given to patients with advanced kidney disease fibrates shouldn't be given to alcoholics
51
Give examples of inhibitors of cholesterol absorption
ezetimibe (zetia) resins plant sterols/stanols
52
What is the action of ezetimibe?
blocks intestinal absorption of cholesterol by blocking transport protein NPC1L1 in the brush border of enterocytes
53
What is the effect of ezetimibe?
does not effect fat-soluble vitamins, triglycerides or bile acids high potency reduces LDL cholesterol by 17-19%
54
What is INEGY? | What is the effect of this treatment?
combination drug therapy single tablet containing simvastatin (statin) and ezetimibe decrease LDL levels by 25%
55
What are the advantages of INEGY? | What are the disadvantages of INEGY?
adv. low potential to interact with other medications convenience single table once a day disadv. expensive
56
Who are prescribed INEGY?
high dose statin patients with side effects severe dyslipidaemia cases shouldn't be given to women who are breastfeeding
57
What are the side effects of INEGY?
``` mild diarrhoae abdominal pain headache rash angio-oedema ```
58
Give examples of resins
colestyramine, colestipol, colesevelam
59
How do resins work? What are the results?
taken orally remain in intestinal tract and bind bile acids preventing their absorption into the blood stream liver compensates by increasing metabolism of endogenous cholesterol into bile acids increased expression of LDL receptor increased clearance LDL from blood decrease concentration of LDL in plasma
60
What are the side effects of resins?
``` bloating constipation diarrhoea nausea interfere with absorption of fat-soluble vitamins, digoxin, warfarin, thyroid hormones, beta blockers and calcium channel blockers rarely used due to intolerance ```
61
Give an example of a PCSK9 inhibitor
evolocumab (repatha) | human monoclonal antibody (IgG2) for PCSK9
62
What is PCSK9?
pro protein converts subtilising/kexin type 9 | negative regulator of LDLR leading to continued/increased LDL circulation
63
What is the mechanism of action of evolocumab?
binds to PSCK9 prevents PCSK9 binding to LDLR prevents PSCK9-mediated LDLR degradation allows increased binding LDL to LDLR lowering circulating LDL levels
64
When is evolocumab prescribed?
adjunction to diet and maximally tolerated statin therapy patients with HeFH patients or clinical CVD adjunction to diet and LDL-lowering therapies for HoFH patients
65
What are the adverse effects of evolocumba (repatha)?
nasopharyngitis upper respiratory tract infection influenza back pain injection site reactions - erythema, pain, bruising hypersensitivity reactions - rash, eczema, erythema, urticaria - indicates to discontinue treatment

CDL301 (14 decks)

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