hiv 2012: you are only as young as your immune system.. daniel nixon do, phd associate professor of...

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HIV 2012: You are only as YOUNG as your Immune System.. Daniel Nixon DO, PhD Associate Professor of Medicine Director – VCU HIV/AIDS Center (http://www.hivcenter.vcu.edu/) [email protected] Office 804-828-4510

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Page 1: HIV 2012: You are only as YOUNG as your Immune System.. Daniel Nixon DO, PhD Associate Professor of Medicine Director – VCU HIV/AIDS Center Director –

HIV 2012: You are only as YOUNG as

your Immune System..

Daniel Nixon DO, PhDAssociate Professor of Medicine Director – VCU HIV/AIDS Center (http://www.hivcenter.vcu.edu/)

[email protected] Office 804-828-4510

Page 2: HIV 2012: You are only as YOUNG as your Immune System.. Daniel Nixon DO, PhD Associate Professor of Medicine Director – VCU HIV/AIDS Center Director –

HIV…we now know where it came from and when (slide from Paul Sharp’s 2006 CROI

lecture)

When? Between ~ 1884 and 1924Nature. Oct 2, 2008

Page 3: HIV 2012: You are only as YOUNG as your Immune System.. Daniel Nixon DO, PhD Associate Professor of Medicine Director – VCU HIV/AIDS Center Director –

“Rumble in the Jungle”

Page 4: HIV 2012: You are only as YOUNG as your Immune System.. Daniel Nixon DO, PhD Associate Professor of Medicine Director – VCU HIV/AIDS Center Director –

Natural History of HIV: Focus on Advanced HIV and Opportunistic Diseases

Page 5: HIV 2012: You are only as YOUNG as your Immune System.. Daniel Nixon DO, PhD Associate Professor of Medicine Director – VCU HIV/AIDS Center Director –

Shifting recommendations for “When to start ART” – IAS USA panel, 1996-2010

> 500 VL>5K VL>10K

350-500

VL>5K VL>5K

200-350

<200

CD4 1996

1998

2000

2002

2004

2006

2008

2010

Page 6: HIV 2012: You are only as YOUNG as your Immune System.. Daniel Nixon DO, PhD Associate Professor of Medicine Director – VCU HIV/AIDS Center Director –

Guidelines 2012: When to Start ART

Guideline HIV with symptoms or Hep B/C

Asymptomatic/No Hepatitis – CD4

<200 200-350 350-500

DHHSMar2012 Yes Yes Yes Yes (mod Rec)

IAS-USA Yes Yes Yes Yes

BHIVAFeb2012 Yes Yes Yes Defer

EACSOct2011 Yes Yes Yes Concider

WHO Yes1 Yes Yes No

1initiate at any CD4 if Hep B or active TBGuidelines for the Use of Antiretroviral Agents in HIV-1-Infected Adults and Adolescents - www.aidsinfo.nih.gov

Page 7: HIV 2012: You are only as YOUNG as your Immune System.. Daniel Nixon DO, PhD Associate Professor of Medicine Director – VCU HIV/AIDS Center Director –

Conflicting Evidence from Observational Studies for Initiating ART with CD4 > 350

Comparison CD4+ count strata HR for death

NA ACCORD <350 vs 350-500 1.7 (1.3 - 2.3) 350-500 vs > 500 1.9 (1.4 – 2.8)

ART CC 251-350 vs 351-450 1.1 (0.8 - 1.6)

351-450 vs 451-550 0.9 (0.6 - 1.4)

HIV-Causal 350 vs 500 1.0 (0.8-1.2)

• Kitahata MM et al, N Engl J Med 2009 • When to Start Consortium, Lancet 2009• HIV Causal Collaboration, Annals Int Med, 2011

Page 8: HIV 2012: You are only as YOUNG as your Immune System.. Daniel Nixon DO, PhD Associate Professor of Medicine Director – VCU HIV/AIDS Center Director –

CD4 at Initiation of ARV Therapy Predicts Extent of CD4 RecoveryCD4 at Initiation of ARV Therapy Predicts Extent of CD4 Recovery

• 1,378 Patients at 10 US Clinics followed From 1996-2007

• Median Peak CD4 was progressively higher for specific CD4 strata (p<0.001)

• Multivariate analysis: Increased mortality with CD4 < 50 (HR=4.6) and CD4 50-199 (HR=2.6) compared to 350 cells/mm3

• Lower baseline CD4 at initiation also associated with increased risk of death from non-AIDS-related causes

Med

ian

CD

4+ c

ell c

ou

nt

Palella F, et al. 17th CROI, 2010

Page 9: HIV 2012: You are only as YOUNG as your Immune System.. Daniel Nixon DO, PhD Associate Professor of Medicine Director – VCU HIV/AIDS Center Director –

Evidence from Randomized Trials for Initiating Treatment at CD4 200-350

• CIPRA-HT001 – a single center trial in Haiti – 2/3 of patients were clinical stage 2 or 3 and the median CD4+ count

at initiation in the deferred ART group was 166 cells/mm3 (IQR: 130, 190).

• SMART study - post-hoc analysis – Only involved 477 patients and of these only 249 were ART-naïve.

• HPTN 052 – Deferral strategy was 200-250 cells; significant difference in

extrapulmonary TB; not powered to address survival (10 versus 13 deaths).

Page 10: HIV 2012: You are only as YOUNG as your Immune System.. Daniel Nixon DO, PhD Associate Professor of Medicine Director – VCU HIV/AIDS Center Director –

Continuous ART at CD4> 350 associated with decreased serious non-AIDS Events in Subset of “relatively” Naïve to ART in SMART

DC Group VS GroupHR (DC/VS)

Deferred vs. EarlyP-valueN Rate N Rate 95% CI

• OD or death 15 4.8 4 1.1 4.4 [1.5, 13.2]0.009

• OD fatal or non-fatal 11 3.5 3 0.8 4.4 [1.2, 15.8]0.02

• Serious non-AIDS 12 3.9 2 0.5 7.1 [1.6, 31.5]0.01

• Composite 21* 7.0 5 1.3 5.1 [1.9, 13.5]

0.001Emery et al, JID, April 2008

Page 11: HIV 2012: You are only as YOUNG as your Immune System.. Daniel Nixon DO, PhD Associate Professor of Medicine Director – VCU HIV/AIDS Center Director –

HPTN 052:ART prevents HIV transmission

• 1763 discordant couples (one HIV-infected partner)• Botswana, Brazil, India, Kenya, Malawi, South Africa, Thailand,

Zimbabwe (+ single US couple)• CD4 count at entry: 350 – 550 cells/mm 䔡

• Index case randomized to IMMEDIATE ART vs DEFERRED ART– Deferral until CD4 count drops to < 250 cells/mm 䔡 or disease

– RESULTS:

• 1 new HIV infection in partners of those on ART• 27 new HIV infections in partners of those deferring ART• 96% efficacy of ART to prevent transmission in this

population!!

Page 12: HIV 2012: You are only as YOUNG as your Immune System.. Daniel Nixon DO, PhD Associate Professor of Medicine Director – VCU HIV/AIDS Center Director –

START Study

HIV-infected individuals who are ART-naïve with CD4+ count > 500 cells/mm3

Early ART Group

Initiate ART immediately following randomization

N=2,000

Deferred ART Group

Defer ART until the CD4+ count declines to < 350 cells/mm3 or

AIDS develops

N=2,000

Page 13: HIV 2012: You are only as YOUNG as your Immune System.. Daniel Nixon DO, PhD Associate Professor of Medicine Director – VCU HIV/AIDS Center Director –

What to Start 2012: DHHS Initial ART Recs

NNRTI based • Efavirenz1 + Tenofovir/Emtricitibine (TDF/FTC) daily

Protease-Inhibitor based

• Atazanvir or Darunavir with low dose Ritonavir “boosting agent”+ TDF/FTC daily

Integrase Inhibitor based

• Raltegravir bid + TDF/FTC daily

Pregnant Women • Lopinavir/Ritonavir bid + AZT and Lamiviudine bid

1. EFV NOT to be used during the 1st trimester of pregnancy or in women who are not using effective and consistent contraception.

Page 14: HIV 2012: You are only as YOUNG as your Immune System.. Daniel Nixon DO, PhD Associate Professor of Medicine Director – VCU HIV/AIDS Center Director –

HIV drugs and especially protease inhibitors have many Interactions..

Guidelines for the Use of Antiretroviral Agents in HIV-1-Infected Adults and Adolescents. March 29, 2012. www.aidsinfo.nih.gov.

FDA drug safety communication, March 1, 2012, www.fda.gov

Statins Interacting Protease Inhibitor

Prescribing recommendation

Atorvastatin Tipranavir/r

Lopinavir/r

Darunavir/rFosamprenavir

Fosamprenavir/rSaquinavir/r

Nelfinavir

Avoid concurrent administration

Use with caution and lowest dose

Do not exceed 20 mg atorvastatin

Do not exceed 40 mg atorvastatin

Fluvastatin No data available

Lovastatin/Simvastatin Contraindicated

Pitavastatin Atazanavir/rDarunavir/rLopinavir/r

No dose limitations

Pravastatin Darunavir/rLopinavir/r

No dose limitions

Rosuvastatin Atazanavir/rLopinavir/r

Do not exceed 10mg

Statins

Page 15: HIV 2012: You are only as YOUNG as your Immune System.. Daniel Nixon DO, PhD Associate Professor of Medicine Director – VCU HIV/AIDS Center Director –

Survival Trends in HIV-infected Patients Have Changed Since the

Adoption of HAART

Survival Trends in HIV-infected Patients Have Changed Since the

Adoption of HAART

Lohse N, et al. Ann Int Med. 2007

Cumulative survival curve for HIV-infected persons (without hepatitis C coinfection) and persons from the general population. N=383,862 (HIV-infected patients, n=3990; General population controls, n=379,872)

Survival From Age 25 Years

1

0.75

0.5

0.25

0

25 30 35 40 45 50 55 60 65 70

Age (years)

Pro

ba

bil

ity

of

Su

rviv

al

Population

Controls

Late HAART (2000-2005)

Early HAART (1997-1999)

Pre-HAART (1995-1996)

Page 16: HIV 2012: You are only as YOUNG as your Immune System.. Daniel Nixon DO, PhD Associate Professor of Medicine Director – VCU HIV/AIDS Center Director –

HIV - the Good News & the Bad• Antiretroviral drugs have tripled average life

expectancy over the last decade, by reducing opportunistic infections, however:

– In ART era only ~10% deaths in HIV infected clinical trials subjects were due to AIDS defining illnesses.

Non-AIDS malig ~ 21%CVD ~ 9%

Liver Disease ~ 9%Non-AIDS Infection ~8%

Page 17: HIV 2012: You are only as YOUNG as your Immune System.. Daniel Nixon DO, PhD Associate Professor of Medicine Director – VCU HIV/AIDS Center Director –

In addition to reducing AIDS/Death, ART reduces serious Non-AIDS Outcomes

No. of Patients with EventsEndpoints

Major CVD, hepatic or renal disease 104 1.8 1.1CVD+ 79 1.3 0.8

Hazard Ratio (95% CI)

RateDC VS

Renal (ESRD) 11 0.2 0.1

1.4Hepatic (Cirrhosis) 17 0.3 0.2

0.1 1 10

1.4

4.5

1.7

Non-AIDS Malig++ 47 0.8 0.5

1.8

1.6

Favors DC Favors VS

Other non-AIDS death 51 0.9 0.5

Any of the above 186 3.2 2.0

1.6

+ MI (clinical or silent), stroke, surgery for CAD++ Except non-melanoma skin

The SMART Study Group. N Engl J Med 2006

Page 18: HIV 2012: You are only as YOUNG as your Immune System.. Daniel Nixon DO, PhD Associate Professor of Medicine Director – VCU HIV/AIDS Center Director –

INFLAMMATION?? Inflammatory Biomakers are Elevated with HIV (SMART) compared to non-HIV (MESA)

Neuhaus J et al. JID 2010

Page 19: HIV 2012: You are only as YOUNG as your Immune System.. Daniel Nixon DO, PhD Associate Professor of Medicine Director – VCU HIV/AIDS Center Director –

SMART Nested Case Control Biomarker Study (85 cases/170con)

Conditional logistic used to estimate ORs for mortality (lowest quartile as reference)

Adjusted OR consider covariates corresponding to: age, race, ART, HIV RNA, CD4+ count, BMI, total/HDL cholesterol, smoking, diabetes, Hep B/C co-infection, use of lipid and BP lowering medication

Page 20: HIV 2012: You are only as YOUNG as your Immune System.. Daniel Nixon DO, PhD Associate Professor of Medicine Director – VCU HIV/AIDS Center Director –

Baseline Biomarkers and All Cause Mortality

Un-adjusted Adjusted

Marker OR (4th/1st) P-value OR (4th/1st) P-value

hs-CRP 2.0 0.05 3.1 0.02

Amyloid A 2.2 0.07 3.1 0.05

Amyloid P 0.7 0.39 1.1 0.78

IL-6 8.3 <0.0001 12.4 <0.0001

D-dimer 12.4 <0.0001 41.2 <0.0001

F1.2 1.0 0.92 1.3 0.64

Kuller L et al, PLoS Med 2008

Page 21: HIV 2012: You are only as YOUNG as your Immune System.. Daniel Nixon DO, PhD Associate Professor of Medicine Director – VCU HIV/AIDS Center Director –

D-dimer: Effect of ART Interruption (DC) for Participants on ART and with an HIV-RNA ≤ 400 copies/mL

0

0.2

0.4

0.6

0.8

DC Group

VS Group

Baseline Month 1

Med

ian

(IQ

R)

D-d

imer

g/m

L)

P<0.001 (27% increase in DC)

Kuller L et al, PLoS Med 2008

Page 22: HIV 2012: You are only as YOUNG as your Immune System.. Daniel Nixon DO, PhD Associate Professor of Medicine Director – VCU HIV/AIDS Center Director –

D-dimer: Effect of ART Initiation (VS) for Participants Not on ART at Entry

Stored plasma for 254 subjects (126 DC arm, 128 VS arm), naïve to ART or off ART >6 mo analyzed for IL-6, hs-CRP, & D-dimer (baseline, mo 2 & 6)

0

0.5

1

Med

ian

(IQR

)D-d

imer

(µg/

mL)

Baseline Month 6Month 2

P<0.001P=0.002

DC Group

VS Group

Baker JV et al. JAIDS 2010

(22% lower for VS)

Page 23: HIV 2012: You are only as YOUNG as your Immune System.. Daniel Nixon DO, PhD Associate Professor of Medicine Director – VCU HIV/AIDS Center Director –

Inflammatory or Coagulopathy Biomarkers Associated with Mortality in RCTs of HIV-infected Individuals

Biomarker Odds ratios*: 1st vs 4th Quartile Effect of HAART Other HIV disease Associations

D-dimer 12.4 (SMART), 2.4 (FIRST) 2.6 (Phidisa)

Decreases CVD

hs-CRP 2.0 (SMART), 2.1 (FIRST), 3.6 (Phidisa)

No decrease CVD, OD

IL-6 8.3 (SMART), 1.8 (FIRST), 3.8 (Phidisa), 1.5** (ACTG 384 and 5015 )

May decrease CVD, OD

sCD14 6.0 (SMART) Unknown Microbial translocation

• While HAART partially reduces some biomarker levels, they still remain elevated compared with healthy non-HIV infected individuals

Page 24: HIV 2012: You are only as YOUNG as your Immune System.. Daniel Nixon DO, PhD Associate Professor of Medicine Director – VCU HIV/AIDS Center Director –

But where would the inflammation be coming from??

Infection destroys gut-associated lymphoid tissue within 4 weeks of infection

-> Recovery is impaired, even with ART..

Brenchley JM et al J Exp Med. 2004

Page 25: HIV 2012: You are only as YOUNG as your Immune System.. Daniel Nixon DO, PhD Associate Professor of Medicine Director – VCU HIV/AIDS Center Director –

HIV-induced gut CD4+ T-cell depletion leads to LPS/microbial translocation into the circulation

-> CHRONIC IMMUNE ACTIVATION

Brenchley, JM et al. Nature Medicine 2006

Page 26: HIV 2012: You are only as YOUNG as your Immune System.. Daniel Nixon DO, PhD Associate Professor of Medicine Director – VCU HIV/AIDS Center Director –

Excessive CD8+T-cell stimulation and activation predicts CD4+ depletion and AIDS

• CD8+ T-cell activation is predictive of HIV disease progression, independent of HIV viral load (Giorgi JV et al. JID 1999 Calbone J et al. AIDS 2000)

• Patients with HIV viremia fully suppressed by ART that have blunted CD4 recovery show continued CD8+ T-cell activation (Anthony KB et al. JAIDS. 2003, Hunt PW et al. JID 2003)

• Elite controllers not on ART with undetectable HIV RNA & CD4 depletion have CD8+ T-cell activation (Hunt PW et al. JID 2008)

– Note: that CD8 “activation” refers to expression of cell surface markers (e.g. CD38 and HLA-DR)..in REALITY, the CD4/CD8 cells are hypoactive/anergic functionally in setting of HIV infection

Page 27: HIV 2012: You are only as YOUNG as your Immune System.. Daniel Nixon DO, PhD Associate Professor of Medicine Director – VCU HIV/AIDS Center Director –

“Inflamm-aging” - Francesch C. et al. Ann NY Acad Sc 2000

De Martinis M et al. Exp and Mol Path 2006

Page 28: HIV 2012: You are only as YOUNG as your Immune System.. Daniel Nixon DO, PhD Associate Professor of Medicine Director – VCU HIV/AIDS Center Director –

HIV and “Inflamm-aging”• HIV infection shares numerous clinical similarities w/ aging

– increased incidence of CVD, malignancy, infection, and chronic viral reactivation, sarco/osteopenia, neurocognitive decline, & frailty

Page 29: HIV 2012: You are only as YOUNG as your Immune System.. Daniel Nixon DO, PhD Associate Professor of Medicine Director – VCU HIV/AIDS Center Director –

HIV and “Inflamm-aging”• HIV infection shares numerous clinical similarities w/ aging

– increased incidence of CVD, malignancy, infection, and chronic viral reactivation, sarco/osteopenia, neurocognitive decline, & frailty

• HIV infection results in T-cell activation and Immunosenescence

– In both aging and HIV infection, this leads to an elevated proportion of CD28(-), CD57(+), memory CD8+ T cells characterized by reduced capacity to produce IL-2, Incr IL-6, apoptosis resistance, & shortened telomers

– Up to half of peripheral CD8+ T-cells are activated in HIV+ individuals, compared with < 10% in healthy HIV - people

Page 30: HIV 2012: You are only as YOUNG as your Immune System.. Daniel Nixon DO, PhD Associate Professor of Medicine Director – VCU HIV/AIDS Center Director –

HIV and “Inflamm-aging”• HIV infection shares numerous clinical similarities w/ aging

– increased incidence of CVD, malignancy, infection, and chronic viral reactivation, sarco/osteopenia, neurocognitive decline, & frailty

• HIV infection results in T-cell activation and Immunosenescence

– In both aging and HIV infection, this leads to an elevated proportion of CD28(-), CD57(+), memory CD8+ T cells characterized by reduced capacity to produce IL-2, Incr IL-6, apoptosis resistance, & shortened telomers

– Up to half of peripheral CD8+ T-cells are activated in HIV+ individuals, compared with < 10% in healthy HIV - people

• HIV+ individuals (median age, 56 years) with good immune reconstitution and viral suppression had T-cell similarities to older (median age, 88 years) HIV- individuals (Desai SR et al. CROI 2009)

Page 31: HIV 2012: You are only as YOUNG as your Immune System.. Daniel Nixon DO, PhD Associate Professor of Medicine Director – VCU HIV/AIDS Center Director –

HIV and “Inflamm-aging”• HIV infection shares numerous clinical similarities w/ aging

– increased incidence of CVD, malignancy, infection, and chronic viral reactivation, sarco/osteopenia, neurocognitive decline, & frailty

• HIV infection results in T-cell activation and Immunosenescence

– In both aging and HIV infection, this leads to an elevated proportion of CD28(-), CD57(+), memory CD8+ T cells characterized by reduced capacity to produce IL-2, Incr IL-6, apoptosis resistance, & shortened telomers

– Up to half of peripheral CD8+ T-cells are activated in HIV+ individuals, compared with < 10% in healthy HIV - people

• HIV+ individuals (median age, 56 years) with good immune reconstitution and viral suppression had T-cell similarities to older (median age, 88 years) HIV- individuals (Desai SR et al. CROI 2009)

• As with increased CD8+ T-cell activation, increased senescence (reduced CD28 expression on CD8+ & CD4+ T cells) associated with more rapid HIV disease progression (Cao W et al. JAIDS 2009)

Page 32: HIV 2012: You are only as YOUNG as your Immune System.. Daniel Nixon DO, PhD Associate Professor of Medicine Director – VCU HIV/AIDS Center Director –

CMV and “Inflamm-aging”• CMV+ adults over ~ 65y/o have a much greater expansion

of CD28- cells than age-matched CMV- controls – many of these cells reflect the oligoclonal expansion of CMV-

specific T cells Hadrup SR et al. J Immuno 2006, Ouyang Q et al. J Clin Immuno 2003 Almanzar G et al. J Virol 2005

Page 33: HIV 2012: You are only as YOUNG as your Immune System.. Daniel Nixon DO, PhD Associate Professor of Medicine Director – VCU HIV/AIDS Center Director –

CMV and “Inflamm-aging”• CMV+ adults over ~ 65y/o have a much greater expansion

of CD28- cells than age-matched CMV- controls – many of these cells reflect the oligoclonal expansion of CMV-

specific T cells Hadrup SR et al. J Immuno 2006, Ouyang Q et al. J Clin Immuno 2003 Almanzar G et al. J Virol 2005

• Clinical significance of these findings is not clear, however, it has already been shown that:– CMV+ older persons are less likely to respond to vaccines

than age-matched, CMV- persons Trzonkowski P et al. Vaccine 2003

– CMV-associated changes in the immune system are predictive of early mortality among older persons Hadrup SR et al. J Immuno 2006, Wikby A et al. J Gerontol 2005

Page 34: HIV 2012: You are only as YOUNG as your Immune System.. Daniel Nixon DO, PhD Associate Professor of Medicine Director – VCU HIV/AIDS Center Director –

CMV & the Swedish OCTO and NONA

studies• 231/240 individuals– mean age of ~ 90 years– followed longitudinally x 4+yrs– Grouped by Immune Risk

Profile

.

Pawelec G et al. Immuno Reviews 2005

Page 35: HIV 2012: You are only as YOUNG as your Immune System.. Daniel Nixon DO, PhD Associate Professor of Medicine Director – VCU HIV/AIDS Center Director –

T-cells are not the only problem…HIV infection Associated w/ BOTH Adaptive

and Innate Immune System Activation • Excess CD4 and CD8 T-cell activation observed in

patients with HIV– Increased CD8 HLA-DR/CD38 expression associated with rapid

CD4 loss, impaired CD4 recovery, poor immunologic responder on ART, & accelerated immune senescence

• Excess B-cell activation observed in patients w/ HIV – Hypergammaglobulinemia, Autoantibodies

• Excess Platelet activation observed in patients w/ HIV – Increased expression of TF, P-selectin, sCD40

• Excess Monocyte/Macrophage activation w/ HIV– Increased expression of TF, CD14/sCD14 – NOTE: CMV infection of monocytes differentiation to

proinflammatory “M1” macrophages (Chan G et al. J Immun 2008)

Page 36: HIV 2012: You are only as YOUNG as your Immune System.. Daniel Nixon DO, PhD Associate Professor of Medicine Director – VCU HIV/AIDS Center Director –

Macrophage Activation and HIV-Associated Vascular Disease

Moore KJ Cell 2011

HIV+ persons are at 2-fold risk for CHD “risk equivalent”

Freiberg CROI 2011

Page 37: HIV 2012: You are only as YOUNG as your Immune System.. Daniel Nixon DO, PhD Associate Professor of Medicine Director – VCU HIV/AIDS Center Director –

CHD Risk Factors:Traditional and HIV-specific

CHD Risk

HIV Infection

AntiretroviralTherapy

Lipids & Lipoproteins

EndothelialInjury and

Inflammation

Hypertension

Smoking

Metabolic Disease(hyperglycemia, insulin resistance, and obesity)

Age Gender FamilyHistory

Page 38: HIV 2012: You are only as YOUNG as your Immune System.. Daniel Nixon DO, PhD Associate Professor of Medicine Director – VCU HIV/AIDS Center Director –

Biomarkers and Cardiovascular Disease:SMART: HDL, D-dimer, IL-6, CRP, & NT-pro-B BNP associated with CVD

• Baseline hsCRP (p<0.0001), IL-6 (p<0.0001), & D-dimer (p=0.0008) elevated in CVD cases

• Total HDL (p<0.0001) was reduced in CVD cases– HDL negatively associated with D-

dimer and IL-6 (R= -0.25)

• N-terminal pro-B-type Natriuretic Peptide elevated in CVD (OR highest vs. lowest quartile – adjusted = 2.3, P =0.02)

Duprez D.A. et al. Atherosclerosis 2009Duprez D.A. et al. 17th CROI 2010

Page 39: HIV 2012: You are only as YOUNG as your Immune System.. Daniel Nixon DO, PhD Associate Professor of Medicine Director – VCU HIV/AIDS Center Director –

Modulating Immune Activation:

AspirinPopulation ASA

doseDesign CRP IL-6 TNF-α

Chronic stable angina 300mg Placebo controlled

--

Metabolic syndrome 300mg Placebo controlled

Metabolic syndrome 100mg Placebo controlled

NS NS

Post-myocardial infarction

160mg vs. warfarin --

Diabetes (Type 2)* 300/100mg

Dose comparison

NS* NS* --

Healthy volunteers 325mg Cross-over NS NS NS

Circulation 1999, Diab. Ob. Met 2008, JPP 2009, AJC 2003, AJC 2003

*Levels declined after starting aspirin but did not reach significance for either dose (n=20/arm)

Page 40: HIV 2012: You are only as YOUNG as your Immune System.. Daniel Nixon DO, PhD Associate Professor of Medicine Director – VCU HIV/AIDS Center Director –

Relative Risk of MI by baseline CRP Stratified by Aspirin (325mg QOD) versus Placebo

Ridker et. al. NEJM 1997

However, A 2009 Lancet Meta-analysis of RCTs found that: Aspirin is of uncertain net value as primary prevention of vascular diseaseHowever, A 2009 Lancet Meta-analysis of RCTs found that: Aspirin is of uncertain net value as primary prevention of vascular disease

Page 41: HIV 2012: You are only as YOUNG as your Immune System.. Daniel Nixon DO, PhD Associate Professor of Medicine Director – VCU HIV/AIDS Center Director –

Modulating Immune Activation: ACTG A5275 - Atorvastatin

• Why look at statins in (non-hyperlipidemic) HIV+ patients?– Blocking HMG-CoA reductase with a statin reduces activation of GTP-

binding proteins RAS and Rho - “molecular switches” that regulate transcription of inflammatory response genes

– Statins inhibit expression of IL-6 (hs- CRP), TF (d-dimer), sCD14, and TNF-a– Statins decrease CD8+ T-cell activation– Statins reduce these biomarkers in numerous settings (e.g. sepsis,

pneumonia, influenza, COPD, hepatocellular CA, CVD)

• JUPITER Study– Rosuvastatin decreased mortality and venous thrombotic disease in

subjects with hsCRP>2 mg/L and “normal” LDL (<130 mg/dl)

– Individuals achieving hsCRP < 2 mg/L (entry criteria >2) had 62% decrease in events

• Ridker et al. NEJM 2008, Ridker et al. Lancet 2009

Page 42: HIV 2012: You are only as YOUNG as your Immune System.. Daniel Nixon DO, PhD Associate Professor of Medicine Director – VCU HIV/AIDS Center Director –

MI Rates by SBP & HIV Status in VACS

<120 120-124 125-129 130-134 135-139 140-144 145-149 150-154 155-159 >160 .0

200

400

600

800

1000

HIV(-) HIV(+)

Systolic BP (mmHg)

AMI r

ate

per 1

0,00

0 p-

y

Armah & Freiberg CROI 2012

SBP Category (mmHg):

<120 120-139 <140 (on Rx) ≥140

aHR for HIV uninfected ref 1.1 1.2 1.4

aHR for HIV infected ref 1.7 2.8 2.8

* Adjusted for age, race/ethnicity, diabetes cholesterol, smoking, HCV, BMI, renal disease, and cocain/EtOH

Page 43: HIV 2012: You are only as YOUNG as your Immune System.. Daniel Nixon DO, PhD Associate Professor of Medicine Director – VCU HIV/AIDS Center Director –

Brusselle et al. Lancet 2011

Page 44: HIV 2012: You are only as YOUNG as your Immune System.. Daniel Nixon DO, PhD Associate Professor of Medicine Director – VCU HIV/AIDS Center Director –

Macrophage Activation and HIV-Associated Pulmonary Disease

• Alveolar Macrophage expression of Matrix MP from HIV+ smokers w/ early emphysema >> than in HIV- smokers w/ early emphysema – Kaner RJ et al. J. Leuk Bio 2009

• HIV and Matrix MP co-localize to areas of empysema at autopsy

Crothers K et al. Am J Resp Crit Care Med 2011

VA Cohort (n=100,000 matched)

Yearsly MM et al. Diag Mol Path 2005

Page 45: HIV 2012: You are only as YOUNG as your Immune System.. Daniel Nixon DO, PhD Associate Professor of Medicine Director – VCU HIV/AIDS Center Director –

Macrophage Activation and HIV-Associated Bone Density Loss

• HIV infection associated with an increased risk (~3X higher that HIV neg) of osteopenia, fracture, and avascular necrosis of bone

• Bone is an immunologically rich tissue & activated macrophages, T-cells, osteoclasts, & inflammatory cytokines play a central role in accelerated bone loss

Mansky KC Clin Interventions in Aging 2010

Page 46: HIV 2012: You are only as YOUNG as your Immune System.. Daniel Nixon DO, PhD Associate Professor of Medicine Director – VCU HIV/AIDS Center Director –

HIV and Osteopenia – Some Issues

• DXA Scanning if >50 y/o (McComskey et al. CID 2010)

• Quit Smoking and Drinking (>3drinks/d)!• Treat Hypogonadism or Hypothyroidism• Weight Bearing Exercise• Safe Home • Vit D – treating low Vit D (<25 ng/dl) reasonable

– Efavirenz is associated with reduction in 25-hydroxy vit D levels – Limited data on vitamin D supplementation in HIV-positive

patients have shown transient, beneficial effects on PTH, but no effects on BMD.

• Bisphosphonates effective (6 RCTs) – Treat with t-score ≤ 2.5 or -1.0-2.5 with FRAX 10 year fracture

prob score >20 (NOF 2008) • Protease Inhibitors and Tenofovir as Risks?

– Avoid starting protease inhibitors if possible with t-score ≤ 2.5

Page 47: HIV 2012: You are only as YOUNG as your Immune System.. Daniel Nixon DO, PhD Associate Professor of Medicine Director – VCU HIV/AIDS Center Director –

Biomarker DC-arm VS-arm p-value forInteraction

OR (95% CI)a p-value OR (95% CI)

p-value

sCD14 (x106 pg/ml) 3.5 (1.5,8.3) 0.004 2.0 (0.8,5.4)

0.15 0.43

LPS (pg/ml) 1.0 (0.6,1.7) 0.96 0.7 (0.3,1.7)

0.40 0.63

I-FABP (pg/ml) 0.9 (0.4,2.1) 0.84 2.3 (0.6,8.8)

0.19 0.58

16S rDNA (copies/l) 0.9 (0.3,2.2) 0.90 0.5 (0.2,1.4)

0.21 0.26

EndoCAb (MMU/ml) 1.1 (0.8,1.6) 0.49 0.9 (0.5,1.4)

0.66 0.57

Macrophage Activation and HIV-Associated Mortality

Only sCD14 levels* (a marker of monocyte/macrophage activation) are associated with mortality among microbial translocation biomarkers

*after adjustment for other risk factors/biomarkers 1st/4th OR = 4.1 (p=0.02)

Sandler N. et al J. Infect Dis. 2011

Page 48: HIV 2012: You are only as YOUNG as your Immune System.. Daniel Nixon DO, PhD Associate Professor of Medicine Director – VCU HIV/AIDS Center Director –

Model of HIV induced “Aging”

Desai S and Landay A Curr HIV/AIDS Rep 2010

Page 49: HIV 2012: You are only as YOUNG as your Immune System.. Daniel Nixon DO, PhD Associate Professor of Medicine Director – VCU HIV/AIDS Center Director –

Model of VIRAL induced “Aging”

Activated Macrophages and T-cells produce IL-6, MMP, etc. in brain, bone, lung, liver, vasculature ~ tissue level

HCVCMV

Bact 16sDNA

LPS

CMV

HIV

Page 50: HIV 2012: You are only as YOUNG as your Immune System.. Daniel Nixon DO, PhD Associate Professor of Medicine Director – VCU HIV/AIDS Center Director –

Take Home Points• Chronic antigen (HIV, LPS, CMV, HCV, etc.) stimulation

leads to excessive stimulation/activation of ALL arms of the immune system

• Chronic immune activation leads to an immune system more likely to cause tissue inflammation & less likely to do its job! This has implications that extend well beyond HIV!– Premature aging – senescence and hypofunction of

the immune system– Progression to AIDS– End organ damage

• Inflammation correlates with many bad outcomes– Treating HIV helps & should be done but doesn’t

entirely halt this problem– Numerous strategies to modulate immune

activation/inflammation under study

Page 51: HIV 2012: You are only as YOUNG as your Immune System.. Daniel Nixon DO, PhD Associate Professor of Medicine Director – VCU HIV/AIDS Center Director –

Take Home Points• Inflammation also increased by:

– Smoking: e.g. a study found that HIV - women who stopped smoking showed decreased levels of CRP, IL-6, TNF-alpha within weeks after quitting

– Diet / Obesity: adipocytes are “cytokine factories”

– Other common disease processes like diabetes

• Role of PCP: Managing these sources of inflammation, CVD risk reduction (e.g. BP, ASA, Statin), alcohol cessation, expanded cancer and bone density screening, helping with adherence, watch drug-drug interactions, & STD risk reduction

• Don’t forget routine OPT-OUT HIV testing.. Inpatient, outpatient, ED

Page 52: HIV 2012: You are only as YOUNG as your Immune System.. Daniel Nixon DO, PhD Associate Professor of Medicine Director – VCU HIV/AIDS Center Director –

THANK YOU for your ATTENTION!