Proliferative Study of Adipose-Derived Stem Cells Jay Sehgal North Allegheny Senior High School...
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Transcript of Proliferative Study of Adipose-Derived Stem Cells Jay Sehgal North Allegheny Senior High School...
Proliferative Study of Adipose-Derived Stem
Cells
Jay SehgalNorth Allegheny Senior
High SchoolGrade 11
Background Information
Stem cells Undifferentiated cells Pluripotent
Mature into specialized cells Embryonic vs. Adult
Embryonic Controversial (destruction of
embryo) Adult
Non-controversial Self-renewing Great therapeutic potential
Background Information
Adipose-derived stem cells (ASCs) Isolated from human adipose tissue (fat)
Abundant - Ideal source for regenerative medicine use
Plastic surgery Liposuction
Human ASCs Bone Cartilage Muscle Fat
Introduction
ASCs derived from: Abdominal superficial fat
Subcutaneous Above abdominal muscles
Omental fat Omentum Deep in abdomen
Which depot is better for clinical applications?
Purpose
Anecdotal evidence suggests omental fat stem cells have a greater proliferative capacity than those derived from other depots
Goal of this study is to confirm or deny this theory
Hypothesis
Null hypothesis Stem cells derived from omental
fat will have an equal proliferative capacity as stem cells derived from abdominal superficial fat
Key Materials
CyQUANT® Cell Proliferation Assay Kit
Hemacytometer Human abdominal superficial fat Human omental fat SpectraFluor fluorescence reader
Isolation & Expansion
Fat tissue from plastic surgeon 2 patients
67F & 52F Abdominal & Omental depots
ASCs isolated from fat into ASC growth media
ASCs cultured Incubator @ 37°C 1-2 weeks
Initial Count
ASCs: Rinsed in phosphate buffered saline
(PBS) w/ ethylenediaminetetraacetic acid (EDTA) to disengage clumped cells
Suspended w/ trypsin Centrifuged to form pellet Supernatant (w/ trypsin) removed Media added to pellet
ASCs vortexed to re-suspend Stained w/ Trypan blue Counted using hemacytometer
Pellet w/ set # of cells frozen for each depot
Proliferation
ASCs for each patient & depot incubated at 3 time points at 3 seating densities in triplicate 24, 48, 96 hrs 2.5k, 10k, 40k cells
At each time point Media aspirated ASCs rinsed in PBS Plate frozen to lyse cell membranes
DNA preserved
67F Omental – 24hrs
100x
67F Abd. Sup. – 24hrs
100x
67F Omental – 48hrs
100x
67F Abd. Sup. – 48hrs
100x
CyQUANT® Assay
Frozen pellet used to create standard curve Cells added from suspended pellet to 16
well plate w/ increasing cell #s Cells thawed & lysed w/ buffer Green fluorescent dye, CyQUANT® GR
dye, added to cells Exhibits strong fluorescence enhancement
when bound to cellular nucleic acids Std. curve plates read in SpectraFluor
fluorescence reader CyQUANT® GR dye & cell-lysis buffer
added to patient cells Fluorescence read in SpectraFluor Readings compared to std. curve to get
cell count
DataAverage Cell Counts
2,500 cells Omental Sup. Abd. p-value
24 hours3810.78 1745.75 0.095
48 hours4357.09 4685.33 0.837
96 hours9937.68 11155.51 0.709
10,000 cells Omental Sup. Abd. p-value
24 hours7895.20 6520.62 0.423
48 hours10770.66 9981.24 0.662
96 hours29716.99 45901.66 0.251
40,000 cells Omental Sup. Abd. p-value
24 hours18669.17 9168.58 0.098
48 hours15231.59 15316.03 0.938
96 hours31352.90 35671.46 0.736
DataAverage Cell Counts
20 30 40 50 60 70 80 90 1000
2000
4000
6000
8000
10000
12000
2,500 cells
OmentalSup. Abd.
time (hrs)
# of
cel
ls
DataAverage Cell Counts
20 30 40 50 60 70 80 90 1000
5000
10000
15000
20000
25000
30000
35000
40000
45000
50000
10,000 cells
OmentalSup. Abd.
time (hrs)
# of
cel
ls
DataAverage Cell Counts
20 30 40 50 60 70 80 90 1000
5000
10000
15000
20000
25000
30000
35000
40000
40,000 cells
OmentalSup. Abd.
time (hrs)
# of
cel
ls
Data Analysis/Conclusion
Trends show abdominal superficial cells proliferate faster
P-values of the t-tests state data is statistically insignificant p-value > 0.05
Insufficient evidence to reject the null hypothesis
Possible Sources of Error
Sample size Standard curve Initial count w/ hemacytometer Calibration of equipment
SpectraFluor Pipettes
Future Research
Further superficial abdominal vs. omental assays include: Differentiation
Adipogenesis (fat) Chondrogenesis (cartilage)
Apoptosis (PCD)