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Parallel session IVBBiology of ageing and cancerBiology of ageing and cancer
Chair: Hans Wildiers
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IMMUNOSENESCENCE
AND AGEING
Tamas Fulop M.D., PhDTamas Fulop M.D., PhD
Research Center on Aging, Division of Geriatrics,
University of Sherbrooke, Sherbrooke, Canada
SIOG, Paris, 4 November 2011
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The immune system
adaptive (memory) non-adaptive (innate)
B cells(humoral viaantibodies)
T cells(cellular effectors;
cytokines)
antigen-presenting
cells
dendritic
cells
phagocytes
NK cells
A.E. 1998
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Cooperation between innate and adaptive immune responses
www.goodpsych.com/stress-psychology/
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Immunosurveillance\immunoediting
Innate + adaptive
adaptive
Zitvogel L. Nat Rev Immunol. 2006
adaptive
+ immunosenescence
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users.rcn.com/.../ D/Death_Rate_by_age.gif
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WHAT IS
IMMUNOSENESCENCE?IMMUNOSENESCENCE?
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IMMUNITY AND AGEING
•AGEING: Immune deregulation
•CAUSE: multifactorial
-genetic-genetic
-intrinsic
-environmental: nutrition
•BASIC ALTERATION : cellular immunity
•MODULABLE
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Decreased Increased CD3+ cells (slightly) CD3+DR+ cells
many changes have been reported over the years but there is little
agreement between cross-sectional studies
Major changes in T cells with age
CD3+ cells (slightly) CD3+DR+ cells TCR1 (γδ) cells (slightly) TCR oligoclonality CD4+CD7+ cells TCR variants (mutants) CD4+ cells (slightly or unchanged) CD4+CD8 (αα)+ cells CD45RA+ cells CD45RO+ cells CD28+ cells CD28-negative cells CD95+ cells CD152 (CTLA-4)+ cells
i.e. naive T cells i.e. memory T cells - have never seen antigen - are sensitised to antigen
Pawelec. G et al
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Proliferation with mitogens TCR signal transduction Nuclear transcription factor activation
(AP-1, NF-AT, NF-κB)
Functions
Decreased Increased
(AP-1, NF-AT, NF- B)
IL 2 secretion IL 10 secretion soluble IL 2R secretion IL 6 secretion
IL 2R expression after activation TNF-α secretion CTL generation CD40L (CD154) upregulation and thus B cell help
Telomere lengths DNA damage
Telomerase induction DNA repair hprt & HLA mutations;
Pawelec. G et al
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CELLULAR IMMUNITY: T Lymphocytes
CAUSES OF ALTERATIONS: INTRINSIC
���� Chronic antigenic stimulation
���� Changes in T lymphocytes sub-populations
���� Thymic involution
���� Alteration in T cell intracellular signalling
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It is suggested that many of these changes are caused by:
chronic antigenic stress and oxidative stress
� stimulation by tumour antigens in cancer patients
� stimulation by persistent viruses in the elderly.• CMV, Herpes
Chronic antigenic stress
• CMV, Herpes• Varicella-Zoster Virus (VZV)
� The CD8 cells are characterised by increased resistance
to apoptosis and the CD4 cells by increased susceptibility
� Hence dysfunctional CD8 cells accumulate and specific
CD4 cells are clonally deleted;
� the CD4:8 ratio can become inverted
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CD57 expression on CD8+ T-cells
0
10
20
30
40
50
60
70
% p
ositiv
e c
ells
CD57+KLRG1+ CD8+T-cells
5
10
15
20
25
30
35
40
45
50
55
CMV infection is associated with accumulation of
the most late-differentiated CD8 cells
Seropositive Seronegative0
Seropositive Seronegative05
KLRG1+ CD8+T-cells
Seropositive Seronegative05
101520253035404550556065
Derhovanessian 2008
Most age-associated changes
are exacerbated by or even
caused by, chronic antigenic
stressors, commonly CMV
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Involution of the thymus
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Activation ofnaive cells
Expansion(ca. 28 PDin IM)
Contraction Memory
Antigen Compromised in the elderly
Result: an accumulation of dysfunctional cells
Dysfunctional cells
in IM)Apoptosis Cytokines (IL-15)-
Hypothesis: Because T cell homeostasis maintains constant numbersof T cells in the periphery, even if naive cells continue to be generatedfrom the thymus, the T cell repertoire will be shrunken, contributing toincreased susceptibility to infectious disease and cancer and Inflam-aging.
Pawelec. G et al
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Derhovanessian et al.Immum. Age. 2008
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1818High et al .JAGS. 2010
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Schröder and Rink MAD 2003
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Elimination of pathogen
Control of inflammation
Cell homeostasis
Immune memory
V
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IL
LI
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V
I
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I
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The immune system and aging
Immune memoryT ����
mainly T lymphocytes
T N
T
IMMUNOSENESCENCE
Is accompanied with a greater susceptibility to Inflam-aging,
infections, autoimmune diseases, Alzheimer disease and cancers.
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IMMUNOSENESCENCE
monocytemacrophage
lymphocyte
20% CD3 and CD4
60% capacities of
Immune stimulation
IL 1
IL 6
TNF
Functional deficit
functional
60% capacities of
proliferation
Inadequate response
Prolonged inflammatory syndrome: Inflam-aging
Groupe de travail sur la vaccination en gériatrie
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Fulop et al.
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Fulop et al.
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AGING
Immune system
dysregulation
• Endocrine function
• Neural function
• Cardiovascular health
• Muscle homeostasis
• Glucose metabolism
• Oxidative stress
Immunosenescence
Infection
Cancer
Chronic inflammatory diseases: AD, CVD
Autoimmune disorders
Frailty
Naïve CD4+ T cells
Immunosurveillance
Inflam-Aging
Nutrition
Loss of specificity
Immune Risk Phenotype
CD8+CD28-CD57+
CD4:CD8 < 1
CMV seropositivity
T-cell proliferation
+
Fulop et al. CIA, 2008
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Conclusion
• Elderly are immunocompromised with few naive cells and dysfunctional (exhausted) memory cells, due to chronic antigenic cells, due to chronic antigenic stress (CMV, cancer antigens, …) and thymic involution with altered innate immune response resulting in inflamm-aging as well as cancer development.
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Acknowledgements
Prof Gilles DUPUIS
Prof Abdelouahed KHALIL
Dre Nadine DOUZIECH
FUNDS:IRSCCRSNGCDARQRV
Dr Anis Larbi
Dre Krassimira Tsvetkova
Nancy Allard
Dr Carl Fortin
Prof Eric Frost
Prof Graham PawelecThank you!
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