The Usual Suspects: Cholesterol and Triglyceride
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The Usual Suspects: Cholesterol and Triglyceride. Lipid Structure. Cholesterol: Membranes Bile Acids Steroid Hormones Protein modification. HO. Fatty Acids: Fuel, Prostanoids. Triglycerides:FA for Fuel, Prostanoids Protein modification. COOH. COO. COOH. COO. COOH.

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The Usual Suspects: Cholesterol and Triglyceride

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The usual suspects cholesterol and triglyceride

The Usual Suspects: Cholesterol and Triglyceride


Lipid structure

Lipid Structure

Cholesterol: Membranes

Bile Acids

Steroid Hormones

Protein modification

HO

Fatty Acids: Fuel,

Prostanoids

Triglycerides:FA for Fuel, Prostanoids

Protein modification

COOH

COO

COOH

COO

COOH

COO

Phospholipid: LecithinMembranes

2nd Messengers

HO

+

Glycerol

COO

HO

COO

HO

+

OPOO

N


Structure of a typical lipoprotein

Structure of a Typical Lipoprotein

Free cholesterol

(surface and core)

Phospholipid

(amphipath at

surface only)

Triglyceride

(core only)

Cholesteryl ester

(core only)

Apolipoprotein

(amphipath at

surface only)


Lipoprotein classes and sub classes

VLDL

VLDL

Remnants

Chylomicron

Remnants

Directly atherogenic

(found in plaque)

HDL2

Lipoprotein classes and sub-Classes

Chylomicron

0.95

1.006

IDL

Density (g/ml)

1.02

LDL

1.06

Lp(a)

1.10

HDL3

pre-β2 HDL

1.20

pre-β1 HDL

1000

5

10

20

40

60

80

Particle Size (nm)


Substrates for triacylglycerol synthesis

CPT I

Acyl-Carnitine

CPT II

Substrates for Triacylglycerol Synthesis

Plasma

NEFA

Triglycerides

Glucose

Acyl-CoA Synthetase

Glc-6-Pase

CoA

Acyl-CoA

Multiple steps

Glucose-6-P

Acyl-CoA

PEPCK

Mitochondria

Pyruvate kinase

Fatty Acid Synthase

Hepatocyte

Malonyl-CoA

PEP

Acyl-CoA

Acyl-CoA Carboxylase

Krebs Cycle

Acetyl-CoA

Citrate

Pyruvate

ATP Citrate Lyase

Acetyl-CoA

CO2

Pyruvate

Citrate

HMG-CoA Synthase

Ketone Bodies

Beta-oxidation

PEP = phosphoenolpyruvate PEPCK = PEP carboxylase

CPT = Carnitine palmitoyl transferase


Structures of fatty acids

Structures of Fatty Acids

O

16:0 (palmitic)

C

HO

O

C

cis-18:1 -6 (oleic)

HO

O

trans-18:1 -6 (elaidic)

C

HO

O

C

18:2 -6 (linoleic)

HO

(alpha

linolenic)

O

18:3 -3

C

HO

O

20:5 -3 (EPA)

C

HO


The usual suspects cholesterol and triglyceride

Exogenous (dietary) lipid metabolism

Muscle and adipose tissue

Fatty acids

Lipoprotein lipase

Lipoprotein Lipase

Apo C-II enhances

and apo C-III inhibits

LPL activity

Chylomicron

Remnant

Bloodstream

Plasma

chylomicron

Apo B and apo E are ligandsfor LDL receptor

LDL (apo B,E) receptor clears Chylomicron

Remnants

I

N

T

E

S

T

I

N

E

LDL

receptor

Lymphatic

chylomicron

Hepatocyte

Liver

Xenical blocks diatary

fat digestion


The usual suspects cholesterol and triglyceride

Endogenous (hepatic) lipid metabolism

Muscle and adipose tissue

Fatty acids

Lipoprotein lipase

Lipoprotein Lipase

And hepatic lipase

Apo C-II enhances

and apo C-III inhibits

LPL activity

LDL

Bloodstream

IDL

Apo B and apo E are ligandsfor LDL receptor

LDL (apo B,E) receptor clears VLDL, IDL & LDL

LDL

receptor

VLDL

Hepatocyte

Liver


Clinical hypertriglyceridaemia

Clinical Hypertriglyceridaemia

ConditionFeatures

SecondaryRelatively common (obesity, diabetes,

renal impairment, liver disease, drugs)

PolygenicAccounts for the majority of cases

Familial HTGTG predominates. CVD risk varies

Predisposes to massive HTG

FamilialOverproduction of apo B lipoproteins

Combined H/LTG and TC vary with age and weight

Massive HTGLipoprotein Lipase deficiency or

saturation. Risk of pancreatitis


Therapy for hypertriglyceridaemia

Therapy for Hypertriglyceridaemia

InterventionFeatures

Diet, ExerciseRelatively responsive

Alcohol restrictionOften sufficient in heavy intake

Manage 2o causesDiabetes, renal

FibratesEffective in high TG, low HDL

StatinsMild TG and HDL benefit

Fish oils (eg 6gm/d)Benefits TG rather than HDL

NiacinEffective, but increases glu, urate.

FutureDGAT 2 Inhibitors?

Bile acid resinsContraindicated. Increase TG


The usual suspects cholesterol and triglyceride

NORMAL CHOLESTEROL ABSORPTION

1,300 mg/day

400 mg/day

Oil phase


The usual suspects cholesterol and triglyceride

NORMAL CHOLESTEROL ABSORPTION

1,300 mg/day

400 mg/day

Oil phase

Plant sterols compete

with cholesterol here


The usual suspects cholesterol and triglyceride

NORMAL CHOLESTEROL ABSORPTION

1,300 mg/day

400 mg/day

17,400 mg/day

Oil phase

850 mg/day

Ezetimibe competes

with cholesterol here


The usual suspects cholesterol and triglyceride

NORMAL CHOLESTEROL ABSORPTION

1,300 mg/day

400 mg/day

17,400 mg/day

Oil phase

850 mg/day


Intracellular cholesterol sensing by srebps sterol regulatory element binding proteins

Intracellular cholesterol sensing by SREBPs (Sterol Regulatory Element Binding Proteins)

  • Membrane fluidity reflects intracellular cholesterol. Low levels allow cleavage to active form which binds nuclear receptor to control gene expression.

SCAP or SREBP activating protein

Reg

WD

bHLH

bHLH

bHLH

bHLH

Reg

WD

Nucleus

SCAP

SREBP

SRE

ER

Cytosol

  • SREBP-2 controls cholesterol synthesis and sterol metabolism

Lumen

Sterols

  • SREBP-1c is the major isoform in liver and is a key regulator of fatty acid & triglyceride synthesis

Golgi Apparatus

ZN++

S1P

S2P

Metalloproteinase

Serine protease

Other nuclear receptors: FXR, LXR.


Ldl receptor activity reflects intracellular cholesterol homeostasis

LDL Receptor activity reflects intracellular cholesterol homeostasis

Cholesterol delivery via LDL-R alters intracellular membrane cholesterol and SREBP, which

Reduces synthesis via HMGCoAReductase

Reduces LDL-R synthesis

Increases storage as ester

Reduces counter-regulatory PCSK9

*[SREBP] = sterol regulatory element-binding protein.

Goldstein JL, et al. Arterioscler Thromb Vasc Biol. 2009;29:431-438..


The role of hdl in reverse cholesterol transport

The Role of HDL inReverse Cholesterol Transport

Bile

ABCG1 &SR-B1

Spheroidal HDL

Pre-β HDL

UC

Liver

LCAT

ABCA1

UC

Hepatic lipase, endothelial lipase

PL&UC

SR-BI

SR-A

CETP

LDLReceptor

Macrophage

Oxidation

VLDL/LDL

ABCA1, ATP-binding cassette protein A1; CETP, cholesterol ester transfer protein; FC, free cholesterol; LCAT, lecithin:cholesterol acyltransferase; SR-A, scavenger receptor class A; SR-BI, scavenger receptor class B type I.

Adapted with permission from Cuchel C et al. Arterioscler Thromb Vasc Biol. 2003;23:1710–1712


Clinical hypercholesterolaemia

Clinical Hypercholesterolaemia

ConditionFeatures

SecondaryRelatively uncommon, but potent

(hypothyroidism, nephrotic syndrome,

primary biliary cirrhosis)

PolygenicAccounts for the majority of cases

Familial Prevalent, Accelerates CVD.

Hyperchol’aemiaDue to defects in genes related to LDL-R

FamilialOverproduction of apo B lipoproteins

Combined H/LTG and TC vary with age and weight

Increased HDL?OK if LDL not raised?


Therapy for hypercholesterolaemia

Therapy for Hypercholesterolaemia

InterventionFeatures

DietPlant sterols, avoid sat & trans FA

Manage 2o causesRarer, but potent: (Thyroid, liver,

renal.)

StatinsFirst line for LDL reduction

Ezetimibe2nd line. Neutral for TG & HDL

Niacin Improves LDL, TG, HDL & Lp(a)

Bile acid resinsColesevalam better tolerated

FuturePCSK9 Inhibitors, MTP inhibitors?

Apo B antisense oligonucleotides


Triglyceride and cholesterol why are they linked

Triglyceride and Cholesterol:Why are they linked?

Most lipoproteins have TG and/or CE in their core

Hepatic Triglyceride rich lipoproteins are precursors of cholesterol-rich LDL

Cholesterol-ester transfer protein allows all triglyceride-rich lipoproteins to modify the composition of cholesterol-rich HDL and LDL. As a result, hypertriglyceridaemia is associated with reduced HDL cholersterol as well as “small dense LDL”.

The major gene regulators for lipid metabolism affect both TG and Chol


Key regulators of genes in fatty acid and triglyceride metabolism

SHP

LXR

PPAR

RXR

Key Regulators of Genes in Fatty Acid and Triglyceride Metabolism

Bile Acids

SHP = Short Heterodimer Partner

SREBP-1c

FXR

Acetyl CoA Carboxylase Fatty Acid Synthase Spot 14

Acyl CoA

NEFA

Unsaturated

Saturated

HNF-4α

L-FABP

Fatty acid metabolism

Transport Oxidation Fatty Acid Binding Protein Ketogenesis

Apolipoproteins Pyruvatekinase Glucose-6-phosphalase Transferin Bile Acids

Adapted from Pegorier JP et al. J Nutr 2004;134:2444S-9S


Key regulators of genes in lipid metabolism

Key Regulators of Genes in Lipid Metabolism

Sterol Regulatory Element Binding Protein (SREBP2)

Peroxisome proliferated activator receptors PPARs

Synthesis

Delivery

Acquisition

Cellular Cholesterol Homeostasis

Excretion

Intestine

Hepatobiliary

Liver X Receptor (LXR)

Farnesoid X Receptor (FXR)


Link to mixed hl cases

Link to mixed HL cases


The usual suspects cholesterol and triglyceride

Case MC

Patient is a 43 year-old male with a strong family history of premature CVD who presents for initial evaluation.

He has a 10 year history of dyslipidaemia and hypertension, for which he has received beta blockers in the past. More recently he has been on an ARB/diuretic combination. Three months prior to this visit a fasting lipid profile showed:

Total Cholesterol:5.7 mmol/LTriglyceride:2.8 mmol/LHDL-C:0.7 mmol/LLDL-C:3.6 mmol/L

He has managed to lose 3 kg and today results include:

Total Cholesterol:6.9 mmol/LTriglyceride:1.8 mmol/L HDL-C:0.8 mmol/LLDL-C:5.2 mmol/L


Questions concerning mr m c

Questions concerning Mr M.C.

  • 1) Is ethnicity an independent risk factor for CVD? Yes / No?

  • 2) In the absence of any symptoms or signs of hypothyroidism, would you perform thyroid function tests? Yes / No?

  • 3) His brother’s lipids include LDL = 5.4 mmol/l, TG = 1.9 mmol/l, HDL = 0.9 mmol/l . What is the most likely cause of MC’s lipid abnormality?

    • A) Dyslipidaemia secondary to Insulin resistance and the Metabolic Syndrome

    • B) Polygencdyslipidamia

    • C) Familial Combined Hyperlipidaemia

    • D) Familial Hypercholesterolaemia

    • E) Lipids aren’t really an issue in this patient


The usual suspects cholesterol and triglyceride

Patient is a 43 year-old male with a strong family history of premature CVD who presents for initial evaluation.

He has a 10 year history of dyslipidaemia. Hypertension, for which he has received beta blockers in the past. More recently he has been on an ARB/diuretic combination. Three months prior to this visit a fasting lipid profile showed:

TC: 5.7 Triglyceride: 2.8 mmol/L HDL-C: 0.7 mmol/L LDL-C: 3.6 mmol/L

He has managed to lose 3 kg and today results include:

TC: 6.9 Triglyceride:1.8 mmol/L HDL-C: 0.8 mmol/L LDL-C: 5.2 mmol/L

  • 1) Is ethnicity an independent risk factor for CVD? Yes / No?

  • 2) In the absence of any symptoms or signs of hypothyroidism, would you perform thyroid function tests? Yes / No?

  • 3) His brother’s lipids include LDL = 5.4 mmol/l, TG = 1.9 mmol/l, HDL = 0.9 mmol/l . What is the most likely cause of MC’s lipid abnormality?

    • A) Dyslipidaemia secondary to Insulin resistance and the Metabolic Syndrome

    • B) Polygencdyslipidamia

    • C) Familial Combined Hyperlipidaemia

    • D) Familial Hypercholesterolaemia

    • E) Lipids aren’t really an issue in this patient


Is ethnicity an independent risk factor for cvd yes no

Is ethnicity an independent risk factor for CVD? Yes / No?

YES:

NO:


The usual suspects cholesterol and triglyceride

Is ethnicity an independent risk factor for CVD? Case for a qualified “Yes”.Same risk factors, different pattern

 INTERHEART, Karthikeyan et al 2009,

INTERHEART, Joshi et al 2007


The usual suspects cholesterol and triglyceride

2) In the absence of any symptoms or signs of hypothyroidism, would you perform thyroid function tests? Yes / No?

Yes:

No:


The usual suspects cholesterol and triglyceride

2) In the absence of any symptoms or signs of hypothyroidism, would you perform thyroid function tests? The case for “Yes”


What is the most likely cause of mc s lipid abnormality

What is the most likely cause of MC’s lipid abnormality?

  • A) Dyslipidaemia secondary to Insulin resistance and the Metabolic Syndrome

  • B) Polygencdyslipidamia

  • C) Familial Combined Hyperlipidaemia

  • D) Familial Hypercholesterolaemia

  • E) Lipids aren’t really an issue in this patient


What is the most likely cause of mc s lipid abnormality the case for c maybe a or b

What is the most likely cause of MC’s lipid abnormality? The case for “C”, maybe “A” or “B”

ConditionFeatures

SecondaryRelatively uncommon, but potent

(hypothyroidism, nephrotic syndrome,

primary biliary cirrhosis)

PolygenicAccounts for the majority of cases

Familial Prevalent, Accelerates CVD.

Hyperchol’aemiaDue to defects in genes related to LDL-R

FamilialOverproduction of apo B lipoproteins

Combined H/LTG and TC vary with age and weight

Increased HDL?OK if LDL not raised?


The usual suspects cholesterol and triglyceride

Case MC (continued)

  • Mr MC started statin, therapy, Atorvastatin 20 mg/ day, but unfortunately he had and inferior AMI still 4 months later. His discuharge medication include:

  • Atorvastatin 20mg, Metoprolol 20 mg, Aspirin 100mg, and his previous ARB/diuretic. Follow-up 2 months later reveals:2 kg weight loss, BP 118 / 78, Fasting tests:

  • Glu 5.3 mmol/l, TC 4.4 mmol/l TG 4.2 mmol/l,

  • HDL 0.7 mmol/l, LDL 1.8 mmol/l


The usual suspects cholesterol and triglyceride

Case MC: Further questions:

  • Should you stop his beta blocker? Yes / No?

  • Do you trust the LDL-C result? Yes / No?

  • Is it practical to try to manage Mr M.C’s lipid profile to target levels?Yes / No?

  • What is the next lipid-lowering drug that you would add to his therapy?

  • Ezetimibe

  • Niacin

  • I would increase Atorvastatin to 80 mg but I wouldn’t give anything other than a statin

  • Fenofibrate

  • Fish Oil


The usual suspects cholesterol and triglyceride

  • Mr MC started statin, therapy, Atorvastatin 20 mg/ day, but unfortunately he had and inferior AMI still 4 months later. His discuharge medication include:

  • Atorvastatin 20mg, Metoprolol 20 mg, Aspirin 100mg, and his previous ARB/diuretic. Follow-up 2 months later reveals:2 kg weight loss, BP 118 / 78, Fasting tests:

  • Glu 5.3 mmol/l, TC 4.4 mmol/l TG 4.2 mmol/l,

  • HDL 0.7 mmol/l, LDL 1.8 mmol/l

  • Should you stop his beta blocker? Yes / No?

  • Do you trust the LDL-C result? Yes / No?

  • Is it practical to try to manage Mr M.C’s lipid profile to target levels?Yes / No?

  • What is the next lipid-lowering drug that you would add to his therapy?

  • Ezetimibe b) Niacin c) Increase Atorvastatin to 80 mg but don’t give anything other than a statin

  • d) Fenofibrate e) Fish Oil


The usual suspects cholesterol and triglyceride

Should you stop his beta blocker?

  • Yes

  • No


The usual suspects cholesterol and triglyceride

Should you stop his beta blocker?

The case for “no”

Some β-blockers decrease HDL and increase triglycerides.25 In spite of this, BHAT data showed that propranolol improves survival after MI.26 Low-dose metoprolol CR/XL alone or in combination with a statin resulted in significant slowing of the progression of carotid artery’s intima-media thickness over a 3-year period.27

M Gheorghiade et al Circulation.2002; 106: 394-398


The usual suspects cholesterol and triglyceride

Do you trust the LDL-C result?

  • Yes

  • No


The usual suspects cholesterol and triglyceride

Do you trust the LDL-C result?

The case for “No”

Discussion of the effect of Cholesterol ester transfer protein will

Explain why LDL-C underestimates risk when TG is elevated


The usual suspects cholesterol and triglyceride

Is it practical to try to manage Mr M.C’s lipid profile to target levels?

  • Yes

  • No


The usual suspects cholesterol and triglyceride

Is it practical to try to manage Mr M.C’s lipid profile to target levels? The case for “Yes”

Combination therapy is safe and effective, but yet to

be supported by clinical endpoint data.


The usual suspects cholesterol and triglyceride

What is the next lipid-lowering drug that you would add to his therapy?

  • Ezetimibe

  • Niacin

  • I would increase Atorvastatin to 80 mg but I wouldn’t give anything other than a statin

  • Fenofibrate

  • Fish Oil


The usual suspects cholesterol and triglyceride

What is the next lipid-lowering drug that you would add to his therapy?

The case for “d” or “b”, possibly “c” or “e”

anticipate “residual risk” module


The usual suspects cholesterol and triglyceride

Case GS

Patient is a 47 year-old female who has been gaining weight for several years.

She has a 10 year history of mildly elevated triglyceride. She received therapeutic lifestyle counseling but she has been largely non-compliant. Three months prior to this visit, a fasting lipid profile showed: Total Cholesterol:5.5mmol/L Triglyceride: 2.4mmol/LHDL-C: 1.0mmol/LLDL-C:3.6 mmol/L

Now she has symptoms of hyperglycaemia and repeat fasting glucose confirms Type 2 diabetes


The usual suspects cholesterol and triglyceride

Case GS

  • Review of Symptoms: Thirst, polyuria, folliculitis,

  • Weight unchanged (increased 2kg, then lost when polyuria commenced

  • BP 118/72 Pulse 72 Wt 85kg Ht 175cm Waist 93 cm BMI 27.8: Physical examination unremarkable

  • Current fasting lipid results surprise you:

    • Total Cholesterol:8.5mmol/L

    • Triglyceride:7.4mmol/L

    • HDL-C:1.0mmol/L

    • LDL-C:unable to be calculated


  • The usual suspects cholesterol and triglyceride

    Questions:

    • How could you obtain an LDL-C result?

    • Friedewald equation

    • Abusive phonecall to lab

    • “Direct method” involving detergents

    • Ultracentifugation

    • Subtract HDL-C from Total cholesterol

    • Which class or classes of lipoproteins would you expect to be increased?

    • Chylomicrons and LDL

    • VLDL and LDL

    • VLDL and HDL

    • IDL and chylmicron “remnants”

    • Why bother? It doesn’t matter Which combination of extra tests would be most useful?

    • a) LDL size+HDLsubfractions b) Lipid EPG+ApoEphenotype c) LDL subfractions HDL size d) Lp(a)+ homocysteine

    • e) Routine fasting lipids are the only lipid tests that are ever required


    The usual suspects cholesterol and triglyceride

    • She has a 10 year history of mildly elevated triglyceride. She received therapeutic lifestyle counseling but she has been largely non-compliant. Three months prior to this visit, a fasting lipid profile showed: Total Cholesterol:5.5mmol/L Triglyceride: 2.4mmol/LHDL-C: 1.0mmol/LLDL-C:3.6 mmol/LNow she has symptoms of hyperglycaemia and repeat fasting glucose confirms Type 2 diabetes. Symptoms: Thirst, polyuria, folliculitis, Weight increased 2kg, then lost when polyuria commenced

      • BP 118/72 Pulse 72 Wt 85kg Ht 175cm Waist 93 cm BMI 27.8: Physical examination unremarkable

  • Current fasting lipid results surprise you: TC:8.5mmol/L TG: 7.4mmol/L HDL-C: 1.0mmol/L

  • LDL-C: unable to be calculated

    • How could you obtain an LDL-C result?

    • Which class or classes of lipoproteins would you expect to be increased?

    • Which combination of extra tests would be most useful?


    The usual suspects cholesterol and triglyceride

    How could you obtain an LDL-C result?

    • Friedewald equation

    • Abusive phonecall to lab

    • “Direct method” involving detergents

    • Ultracentifugation

    • Subtract HDL-C from Total cholesterol


    The usual suspects cholesterol and triglyceride

    How could you obtain an LDL-C result?The case for “d”, but “c” is misleading

    Lab Tests Online:

    “Direct LDL-C is ordered whenever calculation of LDL cholesterol will

    not be accurate because the person's triglyceridesare significantly

    elevated. It may be ordered by a doctor when prior test results have

    indicated high triglycerides. In some laboratories, this direct LDL test

    will automatically be performed when the triglyceride levels are too high

    to calculate LDL-C. This saves the doctor time by not needing to order

    another test, saves the patient time by not needing to have a second

    blood sample drawn, and speeds up the time to provide the test result.”

    Ultracentrifuge gives absolute result. Detergent methods assume LDL


    The usual suspects cholesterol and triglyceride

    Which class or classes of lipoproteins would you expect to be increased?

    • Chylomicrons and LDL

    • VLDL and LDL

    • VLDL and HDL

    • IDL and chylmicron “remnants”

    • Why bother? It doesn’t matter


    The usual suspects cholesterol and triglyceride

    • Which class or classes of lipoproteins would you expect to be increased?

    • The case for “b”(orange) or “d” (green)


    Which combination of extra tests would be most useful

    Which combination of extra tests would be most useful?

    • a) LDL size+HDLsubfractions

    • b) Lipid EPG+ApoE genotype/phenotype

    • c) LDL subfractions HDL size

    • d) Lp(a)+ homocysteine

    • e) Routine fasting lipids are the only lipid tests that are ever required


    Which combination of extra tests would be most useful the case for b

    Which combination of extra tests would be most useful?The case for “b”

    CM βpreβα

    ApoEisoforms


    The usual suspects cholesterol and triglyceride

    Case GS (continued)

    • The patient subsequently complied with diet and started on Simvastatin 40 mg daily and other treatment, which she tolerates without difficulty. Current Medications:

    • 1. Metformin 850 mg bid

      • 2. Enalapril  10 mg q day

        3. ASA 81 mg q day

        4. Simvastatin 40 mg q day

        Subsequent results include:LEPG – Broad beta pattern present

        Apo E Genotype: Apo E2:E2


    The usual suspects cholesterol and triglyceride

    Questions

    This implies the accumulation of which lipoprotein class(es)?

    a) VLDL + LDLb) IDL and Chylomicron “remnants”

    Which lipid-lowering drug is the ideal treatment for this situation?

    a) Simvastatin b) Nicotinic Acid c) Questran d) Fibrate

    e) Fish oil f) Ezetimibe

    Which lipid-lowering therapy is strongly CONTRAindicated? a) Simvastatin b) Nicotinic Acid c) Questran d) Fibrate

    e) Fish oil f) Ezetimibe

    Would you stop his statin therapy? Yes / No

    Do you agree with the use of low-dose aspirin in this patient? Yes / No


    The usual suspects cholesterol and triglyceride

    • The patient subsequently complied with diet and started on Simvastatin 40 mg daily and other treatment, which she tolerates without difficulty. Current Medications:

    • 1. Metformin 850 mg bid

      • 2. Enalapril  10 mg q day

        3. ASA 81 mg q day

        4. Simvastatin 40 mg q day

        Subsequent results include:LEPG – Broad beta pattern present

        Apo E Genotype: Apo E2:E2

    This implies the accumulation of which lipoprotein class(es)?

    Which lipid-lowering drug is the ideal treatment for this situation?

    Which lipid-lowering therapy is strongly CONTRAindicated?

    Would you stop his statin therapy?

    Do you agree with the use of low-dose aspirin in this patient?

    The patient asks you about his risk of Alzheimers’ Disease. Is it increased?


    The usual suspects cholesterol and triglyceride

    This implies the accumulation of which lipoprotein class(es)?

    a) VLDL + LDL

    b) IDL and Chylomicron “remnants”


    The usual suspects cholesterol and triglyceride

    This implies the accumulation of which lipoprotein class(es)? The case for “b”


    The usual suspects cholesterol and triglyceride

    Which lipid-lowering drug is the ideal treatment for this situation?

    a) Simvastatin

    b) Nicotinic Acid

    c) Questran

    d) Fibrate

    e) Fish oil

    f) Ezetimibe


    The usual suspects cholesterol and triglyceride

    Which lipid-lowering drug is the ideal treatment for this situation? The case for “d”


    The usual suspects cholesterol and triglyceride

    Which lipid-lowering therapy is strongly CONTRAindicated?

    a) Simvastatin

    b) Nicotinic Acid

    c) Questran

    d) Fibrate

    e) Fish oil

    f) Ezetimibe


    The usual suspects cholesterol and triglyceride

    MDRP2/3

    Which lipid-lowering therapy is strongly CONTRAindicated? The case for “c”

    Hepatocyte

    Heterodimerization with RXR

    Acetyl CoA

    SREPB-1c

    Bile Duct

    FA, TG

    FXR

    VLDL (TG levels)

    Phospholipids


    Do you agree with the aspirin dose comment on the role of aspirin in this patient

    Do you agree with the aspirin dose? Comment on the role of aspirin in this patient.

    Yes

    No


    The usual suspects cholesterol and triglyceride

    Do you agree with the aspirin dose? Comment on the role of aspirin in this patient.Evidence and opinion tending towards “no”?


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