1 An Introduction to Stem Cell Biology Michael L. Shelanski, MD,PhD Professor of Pathology and Cell Biology Columbia University
2 Figures adapted from ISSCR. Presentations of Drs. Martin Pera (Monash University), Dr.Susan Kadereit, Children s Hospital, Boston and Dr. Catherine Verfaillie, University of Minnesota
3 Science 1999, 283: PNAS 1999, 96: Turning Blood into Brain: Cells Bearing Neuronal Antigens Generated in Vitro from Bone Marrow Science 2000, 290: Mezey, E., Chandross, K.J., Harta, G., Maki, R.A., McKercher, S.R. From Marrow to Brain: Expression of Neuronal Phenotypes in Adult Mice Science 2000, 290: Brazelton, T.R., Rossi, F.M., Keshet, G.I., Blau, H.M. Nature 2001, 410: Nat Med 2000, 11:
4 Stem Cell FAQs Do you need to get one from an egg? Must you sacrifice an Embryo? What is an ES cell? What about adult stem cells or cord blood stem cells Why can t this work be done in animals? Are cures on the horizon? Will this lead to human cloning human spare parts factories? Are we going to make a Frankenstein?
5 What is a stem cell? A primitive cell which can either self renew (reproduce itself) or give rise to more specialised cell types The stem cell is the ancestor at the top of the family tree of related cell types. One blood stem cell gives rise to red cells, white cells and platelets
6 Stem Cells Vary in their Developmental capacity A multipotent cell can give rise to several types of mature cell A pluripotent cell can give rise to all types of adult tissue cells plus extraembryonic tissue: cells which support embryonic development A totipotent cell can give rise to a new individual given appropriate maternal support
7 The Fertilized Egg The Ultimate Stem Cell the Newly Fertilized Egg (one Cell) will give rise to all the cells and tissues of the adult animal. Truly Totipotential but difficult to use.
8 Properties of human ES cells The defining feature of an ES cell is its ability to differentiate into a wide range of tissues
9 Embryonic stem cells Derived from five day old spare human embryos before specialised tissues of the body begin to form May be grown indefinitely in culture in the primitive embryonic state Retain the property of pluripotency during extended growth in vitro
11 Properties of pluripotent stem cells Derived directly and at high frequency from pluripotent cell populations in vivo Grow indefinitely in vitro (express telomerase) Maintain normal karyotype Cloned lines capable of differentiation into a wide range of somatic and extraembryonic tissues in vivo and in vitro-at high frequency and under a range of conditions Capable of colonising all tissues including germ line after blastocyst injection to give chimeric offspring
12 Where do human embryonic stem cells come from? ES cell colony Excess IVF Destroy Embryo bank
13 Early Stages of Human Development Zygote Blastocyst (pre-implantation) Catherine M. Verfaillie, University of Minnesota
14 Blastocyst stage of development Body plan not yet apparent Many cells will not form new human, but will give rise to tissue such as placenta which support pregnancy Embryo does not yet necessarily represent a unique individual (twins can form up to 14 days) No precursors of nervous system present yet Not possible to predict whether embryo will be able to develop to term
16 Establishment of ES cells Inner cell mass ES colony days later
17 Characterisation of primate pluripotent stem cells Immunological markers: TRA1-60 and related epitopes, SSEA-3, SSEA-4 Gene expression: transcripts for generic markers of pluripotent stem cells Biological properties: Differentiation into derivatives of all three germ layers
18 Human Embryonic Stem Cells (hesc) Derived from five day old spare human embryos created during IVF. Retain the property of pluripotency during extended culture growth: Unlimited supply for meaningful experiments. Can give rise to clinically relevant cell numbers.
19 What Actually Happens When Stem Cells Do Their Thing ALL SORTS OF THINGS LET S TAKE A LOOK
20 Teratoma formed by human ES cells
21 ES cells give rise to disorganised growths called teratomas Teratomas do not display axis formation or segmentation. Unlike embryos, ES cells on their own are incapable of generating the body plan. This lack of organisation is also seen when ES cells differentiate in vitro
22 ES cell differentiation Cartilage, bone, skin, nerves, gut and respiratory lining form when ES cells are injected into host animals
23 Spontaneous ES cell differentiation in vitro Stop ES cell multiplication ES cell Mixture of differentiated Cells with some pancreatic cells
24 Spontaneous ES cell differentiation in vitro Nerve and muscle cells are found in a complex mixture of many cell types
25 Neural precursors can be derived from ES cells
26 Routes to differentiation Commitment Signal Specific signals for growth and differentiation ES cell Selection and growth of committed precursor cell Production of large numbers of mature cell in pure form
27 How Do We Make A Stem Cell Into a Specific Cell Type? Need to understand biology of differentiation Much Data Can be Derived from Animal Experimentation Use growth factors and differentiation agents Key advantage is the ability to grow large quantities of identical cells
28 Studies of the mammalian embryo provide clues as to how embryonic stem cell differentiation might be controlled
29 The embryo and ES cells Cell interactions between pluripotent cells and extraembryonic cells mediate patterning and fate decisions Do the same cell populations exist in ES cell cultures? Do the same molecules mediate fate decisions in ES cell culture?
30 Cell types derived from human ES cells in vitro Nerve, astrocyte, oligodendrocyte Hematopoietic stem cells Insulin producing cells Cardiomyocytes Hepatocytes Endothelial cells
31 Hematopoietic stem cells from human ES cells (Kaufman et al.) Culture of ES cells on marrow stromal support lines leads to formation of CD34 + hematopoietic precursor cells Will form myeloid erythroid and megakaryocytic colonies. Frequency 1-2%
32 Embryonic stem cells have important applications in biomedical research Basic studies of early human development and its disorders-birth defects, childhood cancers Functional genomics in human cells Discovery of novel factors controlling tissue regeneration and repair In vitro models for drug discovery and toxicology Source of tissue for transplantation medicine
33 Successful treatment of animal models of disease with mouse ES derived cells Severe immune deficiency Diabetes Parkinson s disease Spinal injury Demyelination Myocardial infarction
34 Challenges for transplantation therapy Production of required cell type in sufficient numbers and pure form What cell to transplant Delivery Problems of tissue rejection
35 The immune rejection issue in ES cell based therapy How immunogenic are embryonic or fetal derived grafts? Some transplantation sites will be immunologically privileged Interesting data to suggest embryonic cells can induce tolerance in hosts Fandrich et al Nat. Med. 8: 171, 2002
36 Solutions to the rejection problem Large banks of ES cell lines Manipulation of histocompatibility genes in ES cells Replacement of hematopoietic/lymphoid tissue of patient with ES derived cells prior to transplant Manipulation of T cell response with antibodies or drugs Therapeutic cloning or related techniques
37 Therapeutic cloning Combines cloning methods with embryonic stem cell technology to produce cells which are custom made for patient A promising solution to problem of tissue rejection Used to produce ES cells in mice and cure a severe immune disorder More research may enable us to reprogram adult cells without going through embryo step
38 Adult stem cells Proper tissue organisation and response to demands of growth or repair require that there be restrictions on developmental potential of adult stem cells These limits are strictly imposed by powerful molecular restraints on gene expression and are heritable during many rounds of cell division An adult stem cell may show relaxation of these restrictions in an altered environment, possibly accounting for plasticity. Even so, plasticity is observed usually at low frequency
39 Bone Marrow Stem Cells isolated from human, mouse and rat. Appear only after 35 population doublings. Can be grown to population doublings. Give rise to mesoderm, neuroectoderm and endoderm Can form chimeras with cells in all somatic tissues, when injected into blastocysts (multipotent).
42 Cord Blood Stem Cells rare cell, CD45 / HLA Grow robustly in vitro without differentiating. Give rise to mesoderm, neuroectoderm and endoderm. In vivo: differentiation into neural cells, bone andcartilage, blood, myocardial cells and Purkinje fibers, hepatic cells.
43 Nuclear Transfer To produce cells which are custom made for patient. A promising solution to problem of tissue rejection, as cells express the patients genes. Embryonic stem cell lines created from patients with certain diseases, to study disease development and to develop drugs.
44 Therapeutic cloning in transplantation: necessary or feasible? How severe will immune rejection problem be? Other solutions exist to the problem Is it practical? Where will the eggs come from? Can the procedure be turned around in the required time frame? Is it safe? Is it easier to make normal cells from cloned ES than to make normal animals?
45 Nuclear Transfer A D B E C Mark Denham & Richard Mollard, Monash University F
46 Problems with Nuclear Transfer (NT) Inefficient: blastocysts 1 cell line Time to derive therapeutic cells from NT blastocysts will take several weeks to months.
47 Somatic Cell Nuclear Transfer ES cells Source of eggs: Self, Mother, Relative, Egg bank Cells eg skin Compatible transplants Problems: Inefficient (may need hundreds of eggs) Technically demanding - need to be available in many or all hospitals
49 ARE THERE WAYS AROUND USING EGGS AND EMBRYOS? POSSIBLY
50 Reprogramming without using an egg or making an embryo Now In future Pluripotent cell Adult cell Adult cell Cell fusion Hybrid cell shows activation of embryonic genome Inject proteins from pluripotent cell or egg adult cell becomes pluripotent
51 Do We Have the Ability to Repair Ourselves? Endogenous Stem Cells Need to learn to manipulate in the body Indications from hematology that is possible
52 Cancer Stem Cells Not all the cells within a tumor can maintain tumor growth, most cancers are not clonal. Several long-known oncogenic pathways are pivotal to the maintenance of normal stem cell self-renewal. Techniques used in the stem cell field have identified selfrenewing cells. By identifying the stem cells in tumors, it could be shown that only the cancer stem cells propagated the tumor.
53 Cancer Stem Cells In breast cancer, brain tumors, certain forms of leukemia, and gastric tumor. Unknown whether the tissue stem cell degenerates, or if a more differentiated cell reacquires stem cell phenotype. Despite preventive mechanisms adult stem cells may accumulate mutations over the years.
54 Why we need new stem cell lines Panels of cell lines required for tissue matching in transplantation Safety hazards with current cells derived using animal tissue Current bona fide lines few in number; improvements to techniques will enable production of second generation ES cells with better properties; Need cell lines in the public domain without commercial restrictions on use
55 Are We Making a Frankenstein? Not That Dramatic But, Beware of hype Remember the Law of Unintended Consequences
Stem cells possess 2 main characteristics: -Long-term self renewal. - They give rise to all types of differentiate cells. Sources of pluripotent stem cells: -The inner cell mass of the blastocyst. - Fetal
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