Micro- & Nano-Systems: From Lab Clinic · 2013. 12. 26. · Micro- & Nano-Systems: From Lab Clinic...
Transcript of Micro- & Nano-Systems: From Lab Clinic · 2013. 12. 26. · Micro- & Nano-Systems: From Lab Clinic...
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Micro- & Nano-Systems: From
Lab Clinic
Dr. Javeed Shaikh Mohammed Assistant Professor, Biomedical Technology
College of Applied Medical Sciences
King Saud University
24 October, 2011
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General Outcomes
• Introduce the significance of micro- and nano-
systems in biomedical/clinical applications
• Introduce the challenges in bringing micro- and
systems from lab to the clinic (bench to
bedside)
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Bottom-up & Top-down Approaches
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Macro-, Micro- & Nano-
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Macro-, Micro- & Nano-
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Micro-, Nano- …. but why?
• As dimensions go smaller, surface area to volume
ratios increase
• Unique physical, chemical, and biological properties
can emerge in materials at the micro- and nano-scale
– Gold is inert at macroscale, but highly reactive when it is in
the form of 3nm particles
– At low microliter volumes, fluids act more like solids; two
fluids flowing alongside each other in a microchannel will not
mix (except by diffusion)
• Reduced sample size
• Reduced reagent use
• Improved response time
• High throughput
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Micro-, Nano- …. but why?
• Integrated multi-functionalities
• Improved performance
• Reduced manufacturing cost and time
• Portability
• Low power consumption
• Reach un-accessible sites
• Short time scales
• On-site analysis
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Micro-, Nano- …. but why?
• Nanotechnology
– Improved delivery of poorly water-soluble drugs
– Targeted delivery of drugs to specific cells or
tissues
– Intracellular delivery of macromolecules
– Enhanced half-lives (keeping in circulation at
therapeutic concentrations for longer time)
– Enhance and modulate the distribution of
hydrophobic and hydrophilic drugs into and within
different tissues
– Controlled release profiles
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Micro-Technology
• Any technology that employs micro-sized components,
volumes, dimensions, etc.
• MEMS: Micro Electro Mechanical Systems
• BioMEMS: Biological MEMS
• Microtechnology is not new to clinical labs
– Analyzers using micro volumes
– Micro-arrays (sub-microliter volume dispensing)
– valves, tubing, ion-specific electrodes, microparticles in
devices for immunoassays, capillary flow systems in
analyzers, point-of-care testing devices
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Micro-Technology
• Fabrication derived from the fabrication techniques
used in the microelectronics or IC industry
www.ee.ucla.edu/~jjudy/publications/conference/msc_2000_judy.pdf
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Microtechnology: Microfluidics
• Miniaturization of complex fluid handling and
integrated detection
– Dip stick devices with Lateral flow tests: pregnancy,
cardiac disease, and HIV-1
– POC devices incorporating disposable
microelectronic and microfluidic components
(Metrika, Biosite, iSTAT, unipath)
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Nano-Technology
• Current buzzword
• Any technology that employs 1-100nm sized
components, volumes, dimensions, etc.
• 1 nm is 1 billionth of a meter (5 atoms width)
• Interaction possible with nano-materials with
cells/tissues at molecular level
• Some devices in clinic use nanoparticles or beads as
absorbents and as medium to carry antibodies
• Use of nanotechnology in the clinical laboratory is still
limited
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Micro- and Nano-Technologies
• Micro- and nano-technology are being used
interchangeably as they are being used in
concert with each other
• Nanomaterials/components are important in
microscale devices
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Nanotechnology: Interdisciplinary Field
Chemistry Physics
Biology Engineering
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Nanotechnology
http://lib.bioinfo.pl/app/webroot/img/UserFiles/65944/Image/Figure%203.%20Diverse%20application%20of%20nanotechnology.JPG
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Nanoparticles
http://en.wikipedia.org/wiki/File:Mesoporous_Silica_Nanoparticle.jpg
TEM (a, b, and c)
images of prepared
mesoporous silica
nanoparticles with
mean outer diameter:
(a) 20nm, (b) 45nm,
and (c) 80nm. SEM
(d) image
corresponding to (b).
The insets are a high
magnification of
mesoporous silica
particle
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Nanotubes
http://en.wikipedia.org/wiki/Portal:Nanotechnology
This animation of
a spinning carbon
nanotube
showcases its 3D
structure
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Nanowires
http://en.wikipedia.org/wiki/File:Epitaxial_Nanowire_Heterostructures_SEM_image.jpg
An SEM image
of epitaxial
nanowire
heterostructures
grown from
catalytic gold
nanoparticles
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Quantum Dots
http://en.wikipedia.org/wiki/File:QD_mini_rainbow.jpg
Colloidal quantum
dots irradiated with a
UV light; Different
sized quantum dots
emit different color
light due to quantum
confinement
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Dendrimers
http://en.wikipedia.org/wiki/File:Graphs.jpg
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Fullerenes
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Rotating view of Buckminsterfullerene C60
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Nanofibers
http://en.wikipedia.org/wiki/File:N2_2.kesit.JPG
SEM image
of nanofibers
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Microtechnology: General Applications
• Accelerometers for air bag sensors
• Tire-pressure sensors
• Gyroscopes for advanced vehicle stability
control
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Micro-Technology: Clinical Applications
• DNA microarrays
• Protein microarrays
• Microfluidics
• Tissue engineering
• Surface modification
• Implantable systems
• Drug delivery systems
• Biomedical sensors
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Micro-Technology: Clinical Applications
• BioMEMS
– Electronic nose or tongue
– Neural systems capable of controlling motor or sensory
prosthetic devices
– Painless micro-surgical tools
– Microfluidic systems for total chemical or genetic analysis
• Strain gauges: orthopedic research, study of muscles
• Inertial micro-sensors: determine impact level and
patient posture
• Pressure sensors: blood pressure, bladder pressure,
cerebral spinal fluid pressure…
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Microtechnology: Clinical Applications
• Glucose testing: low cost, convenient, fast
turnover time using microtechnology
• Breath sensors for glucose detection
• Abbott: bioresorbable vascular scaffold dubbed
the Absorb
• Drug screening, urine analysis, coagulation,
cardiac assessment, virus detection (HIV)
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Microtechnology: Clinical Applications
• Agilent bioanalyzer (DNA, RNA, or protein
sizing…based on capillary electrophoresis
using small microchips)
• Pharmaceutical industry: screening of
thousands of compounds as candidates for
drugs
• i-STAT analyzer: 12 or more analytes
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Microtechnology: Clinical Applications
• Clinical applications of Electrophoresis for
manipulating particles and droplets and for
sorting cells
– Isolation of rare circulating tumor cells from blood
– Discrimination of cell subpopulations from tumor
tissues
– Analysis of nanoliter sample droplets by highly-
versatile programmable fluidic processors
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Microtechnology: Clinical Applications
Organ Printing
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Microtechnology: Clinical Applications
"medical telesensor"
chip on a fingertip can
measure and transmit
body temperature http://www.imec.be
Cortical probe
http://www.ornl.gov/info/ornlreview/rev29_3/graphics/p55.gif
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Microtechnology: Clinical Applications
Blood pressure
sensors
http://www.acreo.se
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Microtechnology: Clinical Applications
Neural probes
http://actuators.stanford.edu/
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Microtechnology: Clinical Applications
Surgical tools
www.ee.ucla.edu/~jjudy/publications/conference/msc_2000_judy.pdf
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Microtechnology: Clinical Applications
http://www.angiogenesis-center.org
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Microtechnology: Clinical Applications
http://www.nlm.nih.gov/ http://www.mediresource.com
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Microtechnology: Clinical Applications
Parallel screening of
40,000 different
compounds on a 1 cm
chip with 50 μm
oligonucleotide probe
areas
Affymetrix
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Microtechnology: Clinical Applications
Agilent microarrays
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Microtechnology: Clinical Applications
• Rheonix Inc.: Rheonix CARD platform is
complete hands-free operation of molecular
diagnosis across all of potential applications
from infectious disease detection to genotyping
analysis
• Sample in, result out: Cell lysis, DNA extraction
and purification, molecular amplification and
multiplexed end-point detection using
microarrays
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Microtechnology: Clinical Applications
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Microtechnology: Clinical Applications
Ratio Inc.
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Microtechnology: Clinical Applications
BellBrook Labs
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Microtechnology: Clinical Applications
BellBrook Labs
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Nanotechnology in KSA
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Nanotechnology in KSA
• Nansulate®, a nanotechnology based specialty
coating, provides qualities of thermal insulation,
corrosion prevention, resistance to mold
growth, fire resistance, chemical resistance &
lead encapsulation in a water-based coating
formulation
• KSA: Nansulate for energy saving projects and
for asset protection, especially in harsh
environmental conditions (corrosion prevention
for oil pipelines in marine)
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Nanotechnology in KSA
• Saudi Aramco, the oil-giant, plans to employ
nanotechnology for a better assessment of oil
reservoirs
• Saudi Aramco's EXPEC Advanced Research
Center has been developing the concept of
nanoscale Resbots (reservoir robots) for such
applications and hopes to use them in the field
in the near future
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Nanotechnology: General Applications
www.gtlaw.com/portalresource/nanoeh
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Nanotechnology: General Applications
www.gtlaw.com/portalresource/nanoeh
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Nanotechnology: General Applications
www.gtlaw.com/portalresource/nanoeh
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Nanotechnology: General Applications
www.gtlaw.com/portalresource/nanoeh
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Nanotechnology: General Applications
www.gtlaw.com/portalresource/nanoeh
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Nanotechnology: Medical Applications
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Nanotechnology: Medical Applications
www.gtlaw.com/portalresource/nanoeh
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Nanotechnology: Medical Applications
www.gtlaw.com/portalresource/nanoeh
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Nanotechnology: Medical Applications
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Nanotechnology: Oncology
http://nano.cancer.gov/learn/understanding/nanotech_nanoparticles.asp
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Nanotechnology: Oncology
http://nano.cancer.gov/learn/understanding/nanotech_nanoshells.asp
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Nanotechnology: Oncology
http://nano.cancer.gov/learn/understanding/nanotech_cantilevers.asp
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Nanotechnology: Oncology
http://nano.cancer.gov/learn/understanding/nanotech_nanowires.asp
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Nanotechnology: Current Status
Ind
ian J
Exp B
iol, F
eb
200
7
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Nanotechnology: Status
• PSA Bio-barcode assay (FDA approved after 10
years): detect markers at very low concentration
(prostrate-specific antigen)
• Before: toward fundamental research, exploring
potential of nanotechnologies applied to healthcare,
and understand the medical potential of the interface
between inert matter and living organisms
• Now: towards clinical applications in diagnostics and
therapy
• FDA: medical devices and biologics; cosmetics and
dietary supplements do not
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Nanotechnology: Clinical Trials
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Nanotechnology: Clinical Trials
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Nanotechnology: Clinical Trials
• Nanosystems Biology Cancer Center (Caltech/UCLA CCNE):
series of PET imaging agents ([18F]-FAC)
• Center of Nanotechnology for Treatment, Understanding, and
Monitoring of Cancer (UC-San Diego CCNE): chemically
engineered adenovirus nanoparticle to deliver a molecule that
stimulates the immune system (Phase I); significant reductions
in leukemia cell counts, reductions in size of all lymph nodes
• Calando Pharmaceuticals: cyclodextrin-based nanoparticle
(CALAA-01) that safely encapsulates a siRNA agent that shuts
down a key enzyme in cancer cells; tested on patients who
have become resistant to other chemotherapies
• Cerulean Pharma, Inc.: cyclodextrin-based polymer conjugated
to camptothecin (CRLX101); patients with solid tumor
malignancies
http://nano.cancer.gov/learn/now/clinical-trials.asp
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Nanotechnology: Clinical Trials
• Siteman Center of Cancer Nanotechnology Excellence
(Washington U. CCNE): nanoparticle MRI contrast agent that
binds to the αvβ3-intregrin found on the surface of the newly
developing blood vessels associated with early tumor
development (Phase I)
• Diagnostic company Nanosphere: received FDA approval for a
nanosensor test for the drug Coumadin; clinical study using
human tissue samples to monitor very low levels of PSA
• MIT-Harvard Center for Cancer Nanotechnology Excellence:
lymphotrophic superparamagnetic nanoparticles to identify
small and otherwise undetectable lymph node metastases
• Integrated Blood Barcode (IBBC) chip: (Caltech/UCLA CCNE):
validation tests to measure the levels of approximately 800
miRNAs from melanoma patients before and after therapy
http://nano.cancer.gov/learn/now/clinical-trials.asp
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Nanotechnology: Clinical Trials
• Carolina Center of Cancer Nanotechnology Excellence
(University of North Carolina CCNE): CT scanner that uses
carbon nanotubes as the x-ray source (increases the precision
and speed of CT scanning) for detecting small tumors
• Center for Cancer Nanotechnology Excellence Focused on
Therapy Response (Stanford University CCNE): carbon
nanotubes to improve colorectal cancer imaging
• BIND Biosciences (MIT-Harvard CCNE): targeted nanoparticles
consist of a polymer matrix, therapeutic payloads, functional
surface moieties, and targeting ligands which allow for particle
optimization (i.e., accumulation in target tissue, avoidance of
being cleared by immune system, and delivery of drug with
desired release profile)
http://nano.cancer.gov/learn/now/clinical-trials.asp
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Nanotechnology: Regulatory Stage
• MagForce Nanotechnologies (EU regulatory
approval): injecting aminosilane-coated iron oxide
nanoparticles into a tumor; subject to high-frequency
alternating magnetic field; causing vibration of
particles and generation of heat to damage the tumors
• Magnetofluid NanoTherm: iron oxide nanoparticles
• NanoActivator: magnetic field applicator for warming
the nanoparticle loaded tissue
• NanoPlan: software for thermal treatment planning
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Nanotechnology: Regulatory Stage
www.gtlaw.com/portalresource/nanoeh
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Nanotechnology: Approved Drugs
• Two approved nanotechnology based drugs for
cancer treatment
– Doxil (liposome preparation of doxorubicin)
– Abraxane (paclitaxel in nanoparticle formulation)
www.gtlaw.com/portalresource/nanoeh
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Example1: Lab to Clinic
• Islet characterization: viability, purity, and sterility
• Transplant η ↔ Islet function
• Our goal: high-throughput platform for use in islet isolation arena
Shaikh Mohammed, J., Wang, Y., Oberholzer, J., Eddington, D.T., Lab on a Chip 2009
Islet Quantification: Pre Implantation
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Example1: Lab to Clinic
Experimental Setup
Shaikh Mohammed, J., Wang, Y., Oberholzer, J., Eddington, D.T., Lab on a Chip 2009
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Example1: Lab to Clinic
Non potent
islets
Potent
islets
Mice transplantation data: 1000 human islets transplanted into nude mice
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Example2: Lab Clinic
PDB: 3cln PDB: 1lin
50Å 15Å
Protein, Calmodulin (CaM)
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Example2: Lab Clinic
King W.J., Shaikh Mohammed, J., Murphy W.L., Soft Matter 2009
CaM Hydrogel:
Growth Factor
Delivery
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Example2: Lab Clinic
0
25
50
75
100
0 10 20 30 40 50
% V
EG
F R
ele
as
ed
Time (hr)
Collapsed Hydrogel
Expanded Hydrogel
Conformation Change Induced Release
King W.J., Shaikh Mohammed, J., Murphy W.L., Soft Matter 2009
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Challenges: Lab to Clinic
• Environmental health, human health, animal
health, and safety (EHS) concerns
• Stability of nanoparticles in physiological
conditions
• Scalability for large-scale production
• Cost of drug
• Long FDA approval times (10 years or more)
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Challenges: Lab to Clinic
• Toxicity of nanomaterials:
– short term- no toxicity in animals
– long term- not known
• Conjugation Chemistry Challenges:
– Making nanoparticles that are application-specific
– Putting the ‘drug’ in the particle
– Maintaining drug activity in the particle
– Making the drug come off the particle once
application is done
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Challenges: Lab to Clinic
• Patient understanding and willingness
• Lack of patient awareness regarding novel
technologies
• Patient willingness to try the novel technologies
• Knowledge of associated risks is still in early
phase
• Ethical and societal aspects
• Safety of patients and clinicians
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Challenges: Lab to Clinic
• Failure to develop low-cost and convenient
devices that compete with current systems
• POC devices require extreme simplicity in use:
making many technologies not come to clinic
• Healthcare workers accept the point-of-care
devices when assay time is important and
technology is convenient
• Safety and manufacturing feasibility
• Industry interest
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Challenges: Lab to Clinic
• Collaboration between academic researchers
and industry
• Interdisciplinary interactions
• Collaboration among scientists is critical
– Material science experts
– Nanotechnology researchers
– Biomedical scientists
– Medical device engineers
– Practicing clinicians
– Medical entrepreneurs
– Corporate R&D managers