This document discusses gene delivery and therapy techniques. It focuses on magnetofection, which uses magnetic force to improve attraction between cells and nucleic acids or transfection reagents for gene delivery. The document examines magnetofection methods using HEK293 cells and plasmid DNA, analyzing transfection efficiency and cell viability with lipofectamine, polyMAG and CombiMAG. While results varied, CombiMAG nanoparticles with lipoplexes showed potential for in vivo gene delivery with enhanced targeting.
Stephen Friend Complex Traits: Genomics and Computational Approaches 2012-02-23
Presentation Gene Delivery
1. Instituto Superior Técnico
2009/2010
Mestrado em Bioengenharia e Nanossistemas
Projecto Integrado I
David Conceição nº64405
2. Gene delivery/therapy Gene
delivery/therapy
Magneto-
Gene therapy is a technique for correcting defective fection
genes responsible for disease development.
HEK293
cell line
A carrier molecule called a vector must be used to
deliver the therapeutic gene to the patient's target
Cell
cells.
culture
Plasmid DNA
protect the transgene against degradation by transfection
nucleases in intercellular matrices;
Results &
3 major bring the transgene across the plasma
Discussion
criteria membrane and into the nucleus of target cells;
no detrimental effects Conclusion
Projecto Integrado I, July 2010
3. Gene delivery/therapy Gene
delivery/therapy
Viral vectors Magneto-
fection
Retroviruses;
HEK293
cell line
Adenoviruses;
Adeno-associated Cell
viruses (AAV); culture
Herpes simplex
viruses (HSV) Plasmid DNA
transfection
Results &
Discussion
Efficient gene transfer;
Host’s reaction; Conclusion
Unfavorable Pharmaceutical issue-large scale production
Projecto Integrado I, July 2010
4. Gene delivery/therapy Gene
delivery/therapy
Non-Viral vectors Magneto-
fection
HEK293
Physical methods (carrier-free gene delivery)
cell line
Cell
culture
Chemical methods (synthetic vector-based gene delivery
Plasmid DNA
transfection
Results &
Discussion
Conclusion
Projecto Integrado I, July 2010
5. Gene delivery/therapy Gene
delivery/therapy
Non-Viral vectors Magneto-
fection
HEK293
cell line
Cell
culture
Plasmid DNA
transfection
Results &
Discussion
Conclusion
Projecto Integrado I, July 2010
6. Magnetofection Gene
delivery/therapy
Magneto-
fection
HEK293
cell line
Cell
culture
Plasmid DNA
transfection
A magnetic force aroused from a magnetic field applied among
magnetic particles and a magnetofactor plate induces a bigger Results &
Discussion
attraction between cells and the nucleic acids, or transfection
reagents or virus associated with magnetic particles, targeting the Conclusion
gene delivery without changing much the standard protocol.
Projecto Integrado I, July 2010
7. Magnetofection Gene
delivery/therapy
Magneto-
fection
HEK293
cell line
Cell
culture
Usable with all types of nucleic Plasmid DNA
acids (plasmid DNA, RNA, siRNA, transfection
ODN)
Results &
Designed to be associated with Discussion
viruses, or with another
commercial transfection reagent
Conclusion
These magnetofection reagents are
composed with magnetic nanoparticles
associated with a proprietary polymer
Projecto Integrado I, July 2010
8. HEK293 cell line Gene
delivery/therapy
Magneto-
fection
Human embryonic kidney cells
HEK293
cell line
Transformation and culturing of
normal HEK cells with sheared
Cell
adenovirus 5 DNA culture
Plasmid DNA
Incorporation of approximately 4.5 transfection
kilobases from the viral genome into
human chromosome 19 of the HEK cells
Results &
Discussion
The name HEK293 is thusly named
Conclusion
because it was Frank Graham's 293rd
experiment
Projecto Integrado I, July 2010
9. Cell culture Gene
delivery/therapy
Magneto-
Laminar Flow Hood fection
Medium bottles
HEK293
T flasks cell line
Well plates
Cell
Pipettes culture
Etc,
Plasmid DNA
transfection
Culture medium:
Dulbecco's Modified Eagle
Results &
Medium (DMEM) high Discussion
glucose (4.5 g/l), 10%
fetal bovine serum (FBS), Conclusion
1% penicillin/streptomycin
(100 μg/ml) (Invitrogen)
Projecto Integrado I, July 2010
10. Cell culture Gene
delivery/therapy
Magneto-
fection
HEK293
cell line
Cell
culture
Plasmid DNA
transfection
Results &
Discussion
*- Trypan blue is the most common stain used to
distinguish viable cells from nonviable cells; Conclusion
- Neubauer hemacytometer
Projecto Integrado I, July 2010
11. Plasmid DNA transfection Gene
delivery/therapy
Plasmid Magneto-
fection
Vector carrier of the transgene of interest: HEK293
cell line
- pcDNA 3.1 (Invitrogen)
Cell
Identification and measurement of the culture
fluorescence level by flow cytometry using
Plasmid DNA
FACSCalibur equipment (BD Biosciences) - transfection
Fluorescence Activated Cell Sorting
Results &
Discussion
Conclusion
Projecto Integrado I, July 2010
12. Plasmid DNA transfection Gene
delivery/therapy
With lipofectamine Magneto-
fection
HEK293
cell line
Cell
culture
Plasmid DNA
transfection
- Complexes were prepared using a DNA (µg) to Lipofectamine™ 2000
(Invitrogen) (µl) ratio of 1:2 Results &
Discussion
49 µl of Opti-MEM and 1 µl of DNA solution
20 min of
incubation 48 µl of Opti-MEM and 2 µl of Lipofectamine (with 5 min of Conclusion
incubation)
18-48h of incubation in the CO2 incubator
Projecto Integrado I, July 2010
13. Plasmid DNA transfection Gene
delivery/therapy
With PolyMAG Magneto-
fection
HEK293
cell line
Cell
culture
Plasmid DNA
transfection
The proper amount of DNA (1 µg = 1 µl of DNA plasmid solution) was diluted in
200 µl of Opti-MEM® I Medium Results &
Discussion
This solution was then added to the eppendorf containig 0.5 µl of PolyMAG
and mixed gently before a 15 minutes incubation
Conclusion
DNA-PolyMAG complexes were added to each well containing cells and Opti-
MEM® I Medium, and the plate was put over the magnetofector plate
30 min of incubation in the CO2 incubator Projecto Integrado I, July 2010
14. Plasmid DNA transfection Gene
delivery/therapy
With CombiMAG Magneto-
fection
HEK293
cell line
Cell
culture
Plasmid DNA
transfection
Lipoplexes were formed as it was described previously Results &
Discussion
Lipoplexes were added to an eppendorf containing 0.5 µl of CombiMAG
15 minutes of incubation Conclusion
The plate was put onto the magnetofactor plate and
was left in the incubator for 30 minutes
Projecto Integrado I, July 2010
15. Plasmid DNA transfection Gene
delivery/therapy
FACS analysis Magneto-
fection
-Re-suspension of cells and HEK293
centrifugation; cell line
- Cell counting; Cell
culture
Trypsin
Plasmid DNA
PBS transfection
Results &
Discussion
Cells transferred to FACS tubes and subsequent analysis
Conclusion
Projecto Integrado I, July 2010
16. Results & Discussion Gene
delivery/therapy
Magneto-
fection
HEK293
cell line
Cell
culture
Control group for toxicity effects
Plasmid DNA
transfection
Histogram plots of the fluorescence signal carried by
the analyzed cells
Results &
FACS analysis YFP-negative and positive cells: Discussion
M2 and M1
Mean value of fluorescence Conclusion
Projecto Integrado I, July 2010
17. Results & Discussion Gene
delivery/therapy
Magneto-
fection
With lipofectamine
HEK293
cell line
Cell
culture
Plasmid DNA
transfection
Results &
Discussion
%Gated cells (in M1): 61,84
Conclusion
Mean value of fluorescence: 5865,26
Projecto Integrado I, July 2010
18. Results & Discussion Gene
delivery/therapy
Magneto-
fection
With polyMAG
HEK293
cell line
Cell
culture
Plasmid DNA
transfection
Results &
Discussion
%Gated cells (in M1): 22,47
Conclusion
Mean value of fluorescence: 4245,55
Projecto Integrado I, July 2010
19. Results & Discussion Gene
delivery/therapy
Magneto-
fection
With CombiMAG
HEK293
cell line
Cell
culture
Plasmid DNA
transfection
Results &
Discussion
%Gated cells (in M1): 46,71
Conclusion
Mean value of fluorescence: 5156,33
Projecto Integrado I, July 2010
20. Results & Discussion Gene
delivery/therapy
Magneto-
fection
Transfection efficiency, HEK293
Cell Viability, Cell cell line
Recovery and Yield
Cell
culture
Plasmid DNA
transfection
Results &
Discussion
Conclusion
Projecto Integrado I, July 2010
21. Results & Discussion Gene
delivery/therapy
Magneto-
Lipoplexes and CombiMAG complexes have the more intense fection
level of fluorescence thereby having the higher level of protein
expression, and also the bigger amount of YFP positive cells HEK293
cell line
Scherer et al, proposed the use of magnetofection using its
associated concepts such the magnetic force to improve the Cell
DNA attraction to cells culture
Plasmid DNA
transfection
Results &
Discussion
Conclusion
Projecto Integrado I, July 2010
22. Results & Discussion Gene
delivery/therapy
Magnetofection does not necessarily improve the overall performance of a Magneto-
given standard gene transfer method in vitro, but its major advantage consists fection
on the possibility of remotely controlled vector targeting in vivo
HEK293
cell line
As Wang et al proposed,
the preparation of Cell
magnetic nanoparticles culture
with other transfection
reagents like cationic
Plasmid DNA
polymers or cationic transfection
liposomes could be a
great solution.
Results &
Discussion
Conclusion
Projecto Integrado I, July 2010
23. Conclusion Gene
delivery/therapy
Magneto-
fection
CombiMAG nanoparticles associated with lipoplexes gives
interesting results (specially for a possible application in HEK293
cell line
in vivo gene delivery with enhanced targeting).
Cell
culture
Regarding cell viability, PolyMAG exhibited significant
improval towards the other methods
Plasmid DNA
transfection
This work gives a general readout for potential benefits
and disadvantages but, for more coherent conclusions, Results &
Discussion
much more data must be collected
Conclusion
Projecto Integrado I, July 2010
24. Additional features Gene
delivery/therapy
Magneto-
fection
HEK293
cell line
Cell
culture
Plasmid DNA
transfection
Results &
Discussion
Conclusion
In vivo magnetofection Projecto Integrado I, July 2010