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iPS	
  cells:	
  
A	
  BREAKTHROUGH	
  IN	
  STEM	
  CELL	
  RESEARCH

          Presented	
  by	
  Mridula	
  Ray
                  H+	
  2010
Outline
• Embryonic	
  Stem	
  Cells
• iPS	
  cells	
  –	
  turning	
  Adult	
  Cells	
  into	
  Embryonic-­‐
  like	
  cells

• ImplicaCons	
  in	
  research	
  &	
  drug	
  design
• ImplicaCons	
  in	
  medicine
Embryonic	
  Stem	
  Cells
• Self-­‐renewal
	
     Can	
  divide	
  indefinitely	
  into	
  two	
  iden/cal	
  “daughter	
  cells”	
  that	
  have	
  the	
  same	
  
       proper/es	
  as	
  the	
  original	
  cell




• Pluripotency
	
     Can	
  turn	
  into	
  ANY	
  cell	
  in	
  the	
  body
Where	
  do	
  ES	
  cells	
  come	
  from?




                           Modified	
  from
                           h@p://www.biology-­‐online.com
differenCaCon   What	
  can	
  ES	
  cells	
  do?




                                                               reprogramming
                                             Courtesy	
  Biobusiness.tv
Induced	
  Pluripotent	
  Stem	
  (iPS)	
  Cells
• RevoluConary	
  technique	
  to	
  turn	
  cells	
  from	
  
     adult	
  Cssue	
  into	
  an	
  ES	
  cell-­‐like	
  state	
  
	
   Shinya	
  Yamanaka	
  2006

• RelaCvely	
  easy	
  to	
  do,	
  phenomenon	
  reproduced	
  
  by	
  many	
  labs	
  around	
  the	
  world
How	
  are	
  iPS	
  cells	
  made?
THE	
  TECHNIQUE


                                                                        DNA
                                 human	
  DNA


  Replace	
  most	
  of	
  a	
  virus’s	
  DNA	
  with	
  
  human	
  DNA.                                                         Infect	
  a	
  human	
  cell   The	
  the	
  human	
  DNA	
  (and	
  the	
  virus’s	
  DNA)	
  
  The	
  part	
  of	
  the	
  virus	
  DNA	
  that	
  makes	
  it	
                                    get	
  integrated	
  into	
  the	
  cell’s	
  DNA
  dangerous	
  is	
  removed



THE	
  EXPERIMENT


    • Put	
  in	
  4*	
  genes	
  involved	
  in	
  development	
  and	
  
      cancer
    • Conferred	
  ES	
  cell	
  like	
  properCes	
  
Embryonic	
  Stem	
  Cells                                                                     lls!!
                                                                                              S	
  Ce
                                                                                    And	
  iP
• Self-­‐renewal
	
      Can	
  divide	
  indefinitely	
  into	
  two	
  iden/cal	
  “daughter	
  cells”	
  that	
  have	
  the	
  same	
  
        proper/es	
  as	
  the	
  original	
  cell




• Pluripotency
	
      Can	
  turn	
  into	
  ANY	
  cell	
  in	
  the	
  body
WHAT	
  CAN	
  IPS	
  CELLS	
  DO?
The	
  near-­‐future	
  of	
  scienPfic	
  discovery
THE	
  PROBLEM
  • Cannot	
  always	
  obtain,	
  idenCfy	
  or	
  purify	
  stem	
  cells	
  from	
  a	
  
    diseased	
  paCent
  • Cannot	
  always	
  study	
  diseased	
  cells	
  in	
  a	
  lab	
  (limited	
  lifespan	
  
    even	
  if	
  you	
  can)
  • May	
  take	
  years	
  to	
  see	
  effect

iPS	
  SOLUTION

  • Disease	
  model	
  is	
  improved
  • Drug	
  targets	
  found	
   discovery	
  improved
  • Toxicity	
  studies	
  are	
  improved
iPS	
  cells	
  are	
  a	
  LONG	
  way	
  off	
  from	
  
• Mice	
  grown	
  from	
  iPS	
  cells	
  are	
  more	
  likely	
  to	
  get	
  cancer	
  than	
  
  natural	
  babies
• Is	
  an	
  iPS	
  cell	
  completely	
  reprogrammed	
  on	
  the	
  molecular	
  
  level?	
  	
  
• Quality	
  standards?
• Making	
  iPS	
  cells	
  takes	
  a	
  long	
  Cme!


• Stem	
  cells	
   increases	
  risk	
  of	
  cancer
• Delivery	
  of	
  a	
  stem	
  cell	
  to	
  the	
  right	
  place	
  may	
  be	
  a	
  challenge!
• Ge^ngthe	
  right	
  signals	
  to	
  the	
  stem	
  cells	
  is	
  hard	
  to	
  control
Autologous	
  versus	
  Allogenic
• Autologous	
  –	
  from	
  your	
  own	
  body
• Allogenic	
  –	
  from	
  a	
  donor

Your	
  immune	
  system	
  can	
  recognize	
  “self”	
  from	
  “non-­‐self”

If	
  the	
  donor	
  does	
  not	
  have	
  similar	
  enough	
  geneCc	
  properCes	
  as	
  
       you,	
  your	
  immune	
  system	
  will	
  reject	
  the	
  transplanted	
  organ,	
  
       blood,	
  cells	
  etc

PaCents	
  who	
  have	
  had	
  organ	
  transplants	
  oden	
  have	
  to	
  take	
  
  immuno-­‐suppressive	
  medicines	
  for	
  the	
  rest	
  of	
  their	
  lives
Current	
  and	
  PotenPal	
  Uses	
  of	
  Stem	
  Cells

Current	
  Use                                                PotenCal	
  use	
  with	
  iPS
• IVF                                                         •   N/A
• Bone	
  marrow	
  transplants                               •   Autologous
• Cord	
  blood	
  banking                                    •   Not	
  necessary
• Drug	
  Screening	
  &	
  toxicity
                                                              •   Personalized	
  medicine
• Disease	
  models
• Diabetes                                                    •   From	
  actual	
  diseased	
  cells
• Cornea	
  repair	
  (Australia,	
  India)                   •   Autologous
• Skin	
  grads                                               •   Autologous	
  (no	
  difference)
• Spinal	
  Cord	
  injury	
  (1st	
  ES	
  C	
  FDA	
        •   Autologous
  approved	
  	
  clinical	
  trial	
  in	
  the	
  US)	
  
• Cardiac	
  and	
  bone/carClage	
  regen.                   •   Autologous
• Full	
  organ	
  regeneraCon	
  challenges
THANK	
  YOU!

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Breakthrough Stem Cell Research - Millie Ray - H+ Summit @ Harvard

  • 1. iPS  cells:   A  BREAKTHROUGH  IN  STEM  CELL  RESEARCH Presented  by  Mridula  Ray H+  2010
  • 2. Outline • Embryonic  Stem  Cells • iPS  cells  –  turning  Adult  Cells  into  Embryonic-­‐ like  cells • ImplicaCons  in  research  &  drug  design • ImplicaCons  in  medicine
  • 3. Embryonic  Stem  Cells • Self-­‐renewal   Can  divide  indefinitely  into  two  iden/cal  “daughter  cells”  that  have  the  same   proper/es  as  the  original  cell • Pluripotency   Can  turn  into  ANY  cell  in  the  body
  • 4. Where  do  ES  cells  come  from? Modified  from h@p://www.biology-­‐online.com
  • 5. differenCaCon What  can  ES  cells  do? reprogramming Courtesy  Biobusiness.tv
  • 6. Induced  Pluripotent  Stem  (iPS)  Cells • RevoluConary  technique  to  turn  cells  from   adult  Cssue  into  an  ES  cell-­‐like  state     Shinya  Yamanaka  2006 • RelaCvely  easy  to  do,  phenomenon  reproduced   by  many  labs  around  the  world
  • 7. How  are  iPS  cells  made? THE  TECHNIQUE DNA human  DNA Replace  most  of  a  virus’s  DNA  with   human  DNA. Infect  a  human  cell The  the  human  DNA  (and  the  virus’s  DNA)   The  part  of  the  virus  DNA  that  makes  it   get  integrated  into  the  cell’s  DNA dangerous  is  removed THE  EXPERIMENT • Put  in  4*  genes  involved  in  development  and   cancer • Conferred  ES  cell  like  properCes  
  • 8. Embryonic  Stem  Cells lls!! S  Ce And  iP • Self-­‐renewal   Can  divide  indefinitely  into  two  iden/cal  “daughter  cells”  that  have  the  same   proper/es  as  the  original  cell • Pluripotency   Can  turn  into  ANY  cell  in  the  body
  • 9. WHAT  CAN  IPS  CELLS  DO?
  • 10. The  near-­‐future  of  scienPfic  discovery THE  PROBLEM • Cannot  always  obtain,  idenCfy  or  purify  stem  cells  from  a   diseased  paCent • Cannot  always  study  diseased  cells  in  a  lab  (limited  lifespan   even  if  you  can) • May  take  years  to  see  effect iPS  SOLUTION • Disease  model  is  improved • Drug  targets  found   discovery  improved • Toxicity  studies  are  improved
  • 11. iPS  cells  are  a  LONG  way  off  from   • Mice  grown  from  iPS  cells  are  more  likely  to  get  cancer  than   natural  babies • Is  an  iPS  cell  completely  reprogrammed  on  the  molecular   level?     • Quality  standards? • Making  iPS  cells  takes  a  long  Cme! • Stem  cells   increases  risk  of  cancer • Delivery  of  a  stem  cell  to  the  right  place  may  be  a  challenge! • Ge^ngthe  right  signals  to  the  stem  cells  is  hard  to  control
  • 12. Autologous  versus  Allogenic • Autologous  –  from  your  own  body • Allogenic  –  from  a  donor Your  immune  system  can  recognize  “self”  from  “non-­‐self” If  the  donor  does  not  have  similar  enough  geneCc  properCes  as   you,  your  immune  system  will  reject  the  transplanted  organ,   blood,  cells  etc PaCents  who  have  had  organ  transplants  oden  have  to  take   immuno-­‐suppressive  medicines  for  the  rest  of  their  lives
  • 13. Current  and  PotenPal  Uses  of  Stem  Cells Current  Use PotenCal  use  with  iPS • IVF • N/A • Bone  marrow  transplants • Autologous • Cord  blood  banking • Not  necessary • Drug  Screening  &  toxicity • Personalized  medicine • Disease  models • Diabetes • From  actual  diseased  cells • Cornea  repair  (Australia,  India) • Autologous • Skin  grads • Autologous  (no  difference) • Spinal  Cord  injury  (1st  ES  C  FDA   • Autologous approved    clinical  trial  in  the  US)   • Cardiac  and  bone/carClage  regen. • Autologous • Full  organ  regeneraCon  challenges