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Revised:  Cell cycle kinetics of hematopoietic stem cells Alexey Bersenev Journal Club May 12, 2011
Definitions ,[object Object],[object Object],Cell cycle kinetics: turnover rate –  one division per ... days # of divisions during lifetime
Cycling cell fate decisions: quiescence senescence apoptosis proliferation self-renewal differentiation/ maturation dormancy?
Current general assumptions from HSC biology: ,[object Object],[object Object]
active dormant feedback loop long-term progenitors short-term HSC quiescence self-renewal Conventional model Dormancy model mature blood cells LSK/34-/Flk2-/48-/150+ Dormancy model of hematopoiesis:
Dormant versus active HSC Andreas Trumpp 2008-2009, Linheng Li, Hans Clevers 2010  characteristics dormant HSC active HSC synonyms quiescent primed, self-renewing phenotype LSK/CD34-/Flk2-/CD48-/CD150+ % in HSC pool  ~ 15% ~ 85% quiescence +++ + self-renewal rate +++ + proliferation + +++ replication machinery off on metabolism hibernation/hypoxia active function repair in emergency normal blood turnover niche endosteal vascular signaling Wnt-off/ BMP-on Wnt-on/ BMP-off activation signals active HSC depletion/ INF-α progenitors delpetion feedback loop +++ +
Unresolved questions from dormancy model: ,[object Object],[object Object],[object Object]
Studying of stem cell quiescence - methodology ,[object Object],[object Object],[object Object],[object Object]
BrdU method ,[object Object],[object Object],[object Object],[object Object],[object Object],advantages: disadvantages:
H2B method ,[object Object],[object Object],[object Object],[object Object],[object Object],advantages: disadvantages:
CFSE method – Proposed for studying HSC cell cycle kinetics by  Takizawa  H, from Manz group, 2011   ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],advantages: disadvantages:
Significance of  Takizawa’s study : ,[object Object],[object Object],[object Object],[object Object]
Conclusions (methodology): ,[object Object],[object Object],[object Object]
Conclusions (HSC biology): ,[object Object],[object Object],[object Object]
Challenge the dormancy model: Long-term repopulation HSC are not necessarily permanently split into subpopulations with different cycling kinetics
Hypothetical models of steady state hematopoiesis  turnover rate:  HSC divide every 17.8 days (BrdU/ biotin) aHSC divide every 9-36 days (H2B) dHSC divide every 56-145d HSC divide every 39 days – 18 divisions during lifetime (CFSE)
“ Dynamic repetition” model - Some HSC dominate blood formation for a time, subsequently enter a quiescent state in which other HSC increase hematopoietic contribution, and get reactivated again – repetitive cycles “ dynamic equilibrium” between quiescent fraction and cycling fraction within the HSC population For the first time was proposed by  Ingmar Glauche et al.  Stem cell proliferation and quiescence--two sides of the same coin .  PLoS Comput Biol. 2009 Jul;5(7):e1000447 2009 Glauche concept: HSC flexibly and reversibly adapt their cycling state according to systemic needs
Unresolved questions: ,[object Object],[object Object],[object Object]

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Hsc quiescence online

  • 1. Revised: Cell cycle kinetics of hematopoietic stem cells Alexey Bersenev Journal Club May 12, 2011
  • 2.
  • 3. Cycling cell fate decisions: quiescence senescence apoptosis proliferation self-renewal differentiation/ maturation dormancy?
  • 4.
  • 5. active dormant feedback loop long-term progenitors short-term HSC quiescence self-renewal Conventional model Dormancy model mature blood cells LSK/34-/Flk2-/48-/150+ Dormancy model of hematopoiesis:
  • 6. Dormant versus active HSC Andreas Trumpp 2008-2009, Linheng Li, Hans Clevers 2010 characteristics dormant HSC active HSC synonyms quiescent primed, self-renewing phenotype LSK/CD34-/Flk2-/CD48-/CD150+ % in HSC pool ~ 15% ~ 85% quiescence +++ + self-renewal rate +++ + proliferation + +++ replication machinery off on metabolism hibernation/hypoxia active function repair in emergency normal blood turnover niche endosteal vascular signaling Wnt-off/ BMP-on Wnt-on/ BMP-off activation signals active HSC depletion/ INF-α progenitors delpetion feedback loop +++ +
  • 7.
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  • 15. Challenge the dormancy model: Long-term repopulation HSC are not necessarily permanently split into subpopulations with different cycling kinetics
  • 16. Hypothetical models of steady state hematopoiesis turnover rate: HSC divide every 17.8 days (BrdU/ biotin) aHSC divide every 9-36 days (H2B) dHSC divide every 56-145d HSC divide every 39 days – 18 divisions during lifetime (CFSE)
  • 17. “ Dynamic repetition” model - Some HSC dominate blood formation for a time, subsequently enter a quiescent state in which other HSC increase hematopoietic contribution, and get reactivated again – repetitive cycles “ dynamic equilibrium” between quiescent fraction and cycling fraction within the HSC population For the first time was proposed by Ingmar Glauche et al. Stem cell proliferation and quiescence--two sides of the same coin . PLoS Comput Biol. 2009 Jul;5(7):e1000447 2009 Glauche concept: HSC flexibly and reversibly adapt their cycling state according to systemic needs
  • 18.