1. Aballe, Karen Marie L.
Lamberte, Joshua L.
Sebastian, Marie Elaine S.
Ateneo de Zamboanga University
2. Cell Lineages
• Stem cell divides by mitosis to yield either 2 daughter
cells like itself or one that is a partially progenitor cell
• Stem cell is the main cell that reproduces 2 different
types of daughter cell
• There are 260 or so cell types in the body develop from
stem and progenitor cells such as blood cell, connective
tissue cell, bone cell, neuron, skin cell and sebaceous
gland cells
5. Stem Cell Potentialities
Totipotent – gives rise to any cell types
Pluripotent – gives rise to any cell under a certain cell type
Multipotent – gives rise to other types of cell but is limited
in its ability to be differentiated
Unipotent – gives rise to a certain cell
6. STEM CELL POTENTIALITIES DURING
EMBRYONIC DEVELOPMENT
Organogen
esis and so
Gastrulation on
Multipotent Unipotent
cells
Blastocyst
formation
Pluripotent
cells
Fertilization
Totipotent cells
8. USING EMBRYOS
- Stem cells is one type of, “regenerative
medicine”
- In 1998, a breakthrough occurred when led by
James Thomson
- SOURCES
* all organs (rare)
* earliest embryo through the elderly
* even from corpses and medical waste
(e.g fatty material discarded after liposuction
and surgically removed organs.)
9. EMBRYONIC STEM (ES)
CELLS
2 sources of ES Cells
1. Use of embryos from fertility clinics
where couples undergoing in vitro (test
tube).
2. Somatic-cell nuclear transfer
15. Somatic Stem Cell Therapy: Using
a Bone Marrow Transplant to Cure
Leukemia
• A sample of donor bone marrow containing
healthy stem cells is introduced into the
patient's bloodstream.
• Stem cells will migrate into the patient's bone
marrow and begin producing new, healthy
leukocytes to replace the abnormal cells.
16. Peripheral Blood Stem cells
• Stem cells from bloodstreams
• PBSCs are easier to collect than bone marrow
stem cells, which must be extracted from
within bones.
17. Umbilical Cord Blood Stem
Cells
Umbilical cord blood stem cell transplants are less
prone to rejection than either bone marrow or
peripheral blood stem cells.
first developed a technique to isolate and grow human embryonic stem cells in cell culture.- These sources are not considered really promising because of the inability to locate most adult stem cells within the body and successfully grow them in the lab. ( Ex: in bone marrow, out of 10,000 cells, only one is a stem cell
After being inserted into the egg, the lone (somatic-cell) nucleus is reprogrammed by the host egg cell. The egg, now containing the somatic cell's nucleus, is stimulated with a shock and will begin to divide. After many mitotic divisions, this single cell forms a blastocyst (an early stage embryo with about 100 cells) with almost identical DNA to the original organism