cardiac stem cell therapeutics from the outside, looking...
TRANSCRIPT
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State of the Art:
Cardiac Stem Cell Therapeutics
from the Outside, Looking In
Gerald W Dorn II
No conflicts or disclosures
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Those who can do;
those who can’t give “State of the Art” lectures.
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Myocardial infarction can kill ~1 billion cardiac myocytes.
Nadal-Ginard B et al. Circulation Research 2003;92:139-150
Early apoptosis, late necrosis
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Acute intervention for MI is unlikely
to get measurably faster or better.
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Heart failure is increasing in prevalence.
Medical therapy is not curative.
Heart transplants are for only a few.
Regenerative therapies offer a CURE.
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Poss KD et al. Science 2002; 2188-90
Some hearts can regenerate lost myocardium:
Adult zebrafish
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Neonatal mouse
Some hearts can regenerate lost myocardium:
Porrello ER et al. Science 2011;331:1078-80
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Neonatal mouse
Developing cardiomyocytes can generate new cardiomyocytes:
Porrello ER et al. Science 2011;331:1078-80
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Even adult mammalian hearts have (limited) regenerative potential
Nadal-Ginard B et al. Circ Res 2003;92:139-150
Regenerating
myocardium in
scarred infarct
Endogenous
myocardial
c-Kit+ stem cells Barile L et al. Prog Cardiovasc Dis 2007 ;50:31-48
Cultured human
“cardiosphere”
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Ronglih Liao, et al. Prog Cardiovasc Dis. 2007;50:18-30
What is the source of regenerative cardiac stem cells?
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Bone marrow mesenchymal stem cells are multipotent
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Rafii and Lyden. Nature Med. 2003;9:702-712
Bone marrow mesenchymal stem cells are angiogenic
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Bone marrow mesenchymal stem cells are useful
for occlusive arterial disease
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What is the optimal source of therapeutic cardiac stem cells?
Myocardium Bone marrow
Pros:
Cardiomyocyte progenitors (or not?)
Potential clinical utility
SCIPIO (atrial explants)
CADUCEUS (RV biopsy)
Cons:
Limited availability
Not likely transdifferentiation and
engraftment
Pros:
Ready availability in large amounts
Possibly more angiogenic
Cons:
Stem cell content low
Variable reported benefits
REPAIR-MI
POSEIDON
TIME
MultiStem
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What is the optimal cardiac disease for stem cell treatment?
Chronic heart failure Acute myocardial infarction
Pros:
HUGE clinical need
Ample opportunity for ex vivo cell
expansion
Cons:
Endogenous repair mechanisms are
inactive
Pros:
Endogenous repair mechanisms are
active
Prevent heart failure easier than cure
Cons:
Limited time for ex vivo cell
expansion
Progress has been better than for
heart failure
Cell engraftment/survival diminished
in ischemic tissue
Nahrendorf et al. Circulation 2010 121:2437-445
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What is the optimal method to deliver regenerative cardiac cells?
Trans-coronary infusion
Strauer and Steinhoff. JACC 2011 58:1095-1104
Intra-myocardial injection
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Once delivered, what is the fate of regenerative cardiac cells?
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Stem cell administration can provide clinical benefit
BUT
Stem cells do not survive to
regenerate damaged myocardium
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Lionetti V et al Heart Failure Rev 2010 15:531-542
In theory,
Direct regeneration
In practice,
Paracrine stimulation of
endogenous repair
The clinical benefits accruing from stem cell therapy are not because they
engraft, differentiate into, and replace cardiac tissue.
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Riley PR Mol Ther 2012 20:1294-6
Maybe cells will ultimately prove
dispensable for cell-mediated regeneration?