REVOLUTION IN

TREATMENT OF CANCER

BY

NANOTECHNOLOGY

POSTER PRESENTED BY :- MAYANK RATHORE

SCHOOL OF STUDIES IN PHARMACEUTICAL SCIENCES

JIWAJI UNIVERSITY GWALIOR (M .P.)

mayank_rathore2003@yahoo.co.inPoster awarded 2nd prize by Department of Biotechnology and

MPCST Cell of Jiwaji University (Govt. of India)Venue :- Department of Neurosciences

Jiwaji University Gwalior Held on 28th February on occasion of

“World Science Day”Having a theme “Emerging Horizon of Sciences”.

Nano technology

• In ancient Greek ‘Nano’ means dwarf.  • Nano technology is the creation of useful

materials, devices and systems through the manipulation of mini scale matter (including anything with at least one dimension less than 100 nanometers).

• The emerging field of nano technology involves scientists from many different disciplines, including physicists, chemists, engineers and biologists R. P. Feynman, a physicist, initially used the Nanoscale.

• Tiny man-made nanoparticles have been used to successfully smuggle a powerful cancer drug into tumor cells leaving healthy cells unharmed.

• When tested in mice, the Nan structure-based therapy was 10 times as effective at delaying tumor growth and far less toxic than the drug given alone.

• Researchers believe the therapy could transform many cancers from killer into chronic, treatable diseases.

• The major goals in designing nanoparticles as a delivery system are to control particle size, surface properties and release of pharmacologically active agents in order to achieve the site-specific action of the drug at the therapeutically optimal rate and dose regimen.

• The purpose of the chemotherapy and radiation is to kill the tumor cells as these cells are more susceptible to the actions of these drugs and methods because of their growth at a much faster rate than healthy cells, at least in adults.

• Research efforts to improve chemotherapy over the past 25 years have led to an improvement in patient survival but there is still a need for improvement.

• Current research areas include development of carriers to allow alternative dosing routes, new therapeutic targets such as blood vessels fueling tumor growth and targeted therapeutics that are more specific in their activity. Several nano biotechnologies mostly based on nanoparticles, have been used to facilitate drug delivery in cancer.

• The magic of nanoparticles mesmerizes everyone because of their multifunctional character and they have given us hope for the recovery from this disease.

• Although we are practicing better drug delivery paths into the body, we ultimately seek more accurate protocols to eradicate cancer from our society.  This review will primarily address new methods for delivering drugs, both old and new, with a focus on nano particle formulations and ones that specifically target tumors.

Core features of cancer cells:-

• Abnormal growth control

• Improved cell survival

• Abnormal differentiation

• Unlimited replicated potential

• Host tumor symbiosis

The Vision for Nano particles in the Treatment of Cancer

• Nano technology is the creation and utilization of materials, devices, and systems through the control of matter on the nanometer-length scale, i.e. at the level of atoms, molecules, and supramolecular structures.

• These technologies have been applied to improve drug delivery and to overcome some of the problems of drug delivery for cancer treatment. Several nanobiotechnologies mostly based on Nanoparticles, have been used to facilitate drug delivery in cancer.

• The magic of Nan particles mesmerizes everyone because of their multifunctional character and they have given us hope for the recovery from this disease.

• Although we are practicing better drug delivery paths into the body, we ultimately seek more accurate protocols to eradicate cancer from our society. This review focuses on progress in treatment of cancer through delivery of anticancer agents via Nanoparticles. In addition, it pays attention to development of different types of Nanoparticles for cancer drug delivery.

Drug therapy of cancer treatment:-

• Transport of an anticancer drug in interestium (target cell) will be governed by physiological (i.e. pressure) and physiochemical (i.e. composition ,structure & charge) property of target cell.

• Also by physiochemical properties of molecules (size, configuration, charge and hydrophobicity) itself.

Thus to deliver therapeutic agent to tumour cell in –vivo one must overcome the following problems:-

• Drug resistance at the tumor level due to physiochemical barrier (non cellular based mechanism).

• Drug resistance at the cellular level (cellular mechanism).

• Distribution, biotransformation & clearance of anticancer drugs in the body.

• A strategy could be associate antitumor drug with colloidal nanoparticles,with the aim to overcome noncellular and cellular based mechanism of resistance

• & to increase the selectivity of drugs toward cancer cells while reducing their toxicity toward normal cells.

Drug delivery strategies used to fight cancers:-

Direct introduction of anticancer drugs into tumour

• Injection directly into the tumour.• Tumour necrosis therapy.• Injection into the arterial blood supply of cancer.• Local injection into tumour for radio potentiation.• Localized delivery of anticancer drugs by electro-chemotherapy.• Local delivery by anticancer drug implants.

Routes of drug delivery

1. Intraperitoneal

2. Intrathecal

3. Nasal

4. Pulmonary inhalation

5. Subcutaneous injection or implant

6. Transdermal drug delivery

7. Vascular route intravenous ,intra-arterial.

Systemic delivery targeted to tumour

1. Heat-activated targeted drug delivery .2. Tissue-selective drug delivery for cancer using carrier-

mediated transport systems .3. Tumour-activated prodrug therapy for targeted delivery

of chemotherapy .4. Pressure-induced filtration of drug across vessels to

tumour .5. Promoting selective permeation of the anticancer agent

into the tumour .6. Two-step targeting using bispecific antibody .7. Site-specific delivery and light-activation of anticancer

proteins .

Drug delivery targeted to blood vessels of tumors

1. Antiangiogenesis therapy .

2. Angiolytic therapy .

3. Drugs to induce clotting in blood vessels of tumour .

4. Vascular targeting agents .

Special formulations and carriers of anticancer drugs

• Albumin based drug carriers • Carbohydrate-enhanced chemotherapy • Delivery of proteins and peptides for cancer therapy • Fatty acids as targeting vectors linked to active drugs • Microspheres • Monoclonal antibodies • Nanoparticles • Pegylated liposome’s (enclosed in a polyethylene glycol

bilayer) • Polyethylene glycol (PEG) technology • Single-chain antigen-binding technology

Transmembrane drug delivery to intracellular targets

• Cytoporter

• Receptor-mediated endocytosis

• Transduction of proteins and Peptides

• Vitamins as carriers for anticancer agents

Biological Therapies

• Antisense therapy

• Cell therapy

• Gene therapy

• Genetically modified bacteria

• Oncolytic viruses

• RNA interference

Pathways For Nanoparticles In Cancer Drug Delivery:

• Nanotechnology has tremendous potential to make an important contribution in cancer prevention, detection,

diagnosis, imaging and treatment. • It can target a tumor, carry imaging capability to

document the presence of tumor, sense pathophysiological defects in tumor cells, deliver therapeutic genes or drugs based on tumor characteristics, respond to external triggers to release the agent and document the tumor response and identify residual tumor cells.

• Nanoparticles are important because of their nanoscaled structure but nanoparticles in cancer are still bigger than many anticancer drugs.

• Their “large” size can make it difficult for them to evade organs such as the liver, spleen, and lungs, which are constantly clearing foreign materials from the body. In addition, they must be able to take advantage of subtle differences in cells to distinguish between normal and cancerous tissues.

• Indeed, it is only recently that researchers have begun to successfully engineer nanoparticles that can effectively evade the immune system and actively target tumors. Active tumor targeting of nanoparticles involves attaching molecules, known collectively as ligands to the outsides of nanoparticles.

• These ligands are special in that they can recognize and bind to complementary molecules, or receptors, found on the surface of tumor cells. When such targeting molecules are added to a drug delivery nanoparticle, more of the anticancer drug finds and enters the tumor cell, increasing the efficacy of the treatment and reducing toxic effects on surrounding normal tissues.

Development And Commercialization Of Nanomaterials:

• Drug delivery techniques were established to deliver or control the amount, rate and, sometimes location of a drug in the body to optimize its therapeutic effect, convenience and dose. Combining a well established drug formulation with a new delivery system is a relatively low risk activity and can be used to enhance a company’s product portfolio by extending the drug’s commercial life-cycle.

• Most companies are developing pharmaceutical applications, mainly for drug delivery. Most major and established pharmaceutical companies have internal research programs on drug delivery that are on formulations or

dispersions containing components down to nano sizes. • With the total global investment in nanotechnologies currently at € 5

billion, the global market is estimated to reach over € 1 trillion by 2011-2015. Nano and Micro technologies are part of the latest advanced solutions and new paradigm for decreasing the discovery and development time for new drugs and potentially reducing the

development costs. 

Tools Of Nanotechnology:Some of the tools of nanotechnology having applications in cancer

treatment are the following:

1. Cantilevers

2. Nanopores

3. Nanotubes

4. Quantum dotes

5. Nanoshells

6. Dendrimers

7. Nanoboms

8. Nanowires

9. Nanoparticles

10. Gold nano-shells

1.Cantilevers

• Tiny bars anchored at one end can be engineered to bind to molecules associated with cancer. These molecules may bind to altered DNA proteins that are present in certain types of cancer monitoring the bending of cantilevers; it would be possible to tell whether the cancer molecules are present and hence detect early molecular events in the development of.

2.Nanopores • Nanopores (holes) allow DNA to pass through

one strand at a time and hence DNA sequencing can be made more efficient. Thus the shape and electrical properties of each base on the strand can be monitored. As these properties are unique for each of the four bases that make up the genetic code, the passage of DNA through a nano pore can be used to decipher the encoded information, including errors in the code known to be associated with cancer.

3.Nanotubes • Nanotubes are smaller than Nanopores. Nanotubes &

carbon rods, about half the diameter of a molecule of DNA, will also help identify DNA changes associated with. It helps to exactly pin point location of the changes. Mutated regions associated with cancer are first tagged with bulky molecules. Using a nano tube tip, resembling the needle on a record player, the physical shape of the DNA can be traced. A computer translates this information into topographical map. The bulky molecules identify the regions on the map where mutations are present. Since the location of mutations can influence the effects they have on a cell, these techniques will be important in predicting disease.

4.Quantum Dotes (QD)

• These are tiny crystals that glow when these are stimulated by ultraviolet light. The latex beads filled with these crystals when stimulated by light, the colors they emit act as dyes that light up the sequence of interest. By combining different sized quantum dotes within a single bead, probes can be created that release a distinct spectrum of various colors and intensities of lights, serving as sort of spectral bar code.

5.Nanoshells (NS)

• These are another recent invention. NS are miniscule beads coated with gold.

• By manipulating the thickness of the layers making up the NS, the beads can be designed that absorb specific wavelength of light.

• The most useful nanoshells are those that absorb near infrared light that can easily penetrate several centimeters in human tissues.

• Absorption of light by nanoshells creates an intense heat that is lethal to cells. Nanoshells can be linked to antibodies that recognize cancer cells. In laboratory cultures, the heat generated by the light-absorbing nanoshells has successfully killed tumor cells while leaving neighboring cells intact .

6.Dendrimer • A number of nanoparticles that will facilitate drug delivery are being

developed. One such molecule that has potential to link treatment with detection and diagnostic is known as dendrimer.

• These have branching shape which gives them vast amounts of surface area to which therapeutic agents or other biologically active molecules can be attached. A single dendrimer can carry a molecule that recognizes cancer cells, a therapeutic agent to kill those cells and a molecule that recognizes the signals of cell death.

• It is hoped that dendrimers can be manipulated to release their contents only in the presence of certain trigger molecules associated with cancer. Following drug releases, the dendrimers may also report back whether they are successfully killing their targets. 

• The technologies mentioned above are in the various stages of discovery and development. Some of the technologies like quantum dots, nano pores and other devices may be available for detection and diagnosis and for clinical use within next ten years.

7.Nanoparticles•Nanoscale  devices  have the  potential  to radically  change  cancer  therapy  for the better  and  to dramatically  increase  the  number  of  highly effective  therapeutic  agents.

•In  this  example, nanoparticles  are  targeted to  cancer  cells for  use  in the molecular  imaging of  a  malignant lesion.  Large  numbers of  nanoparticles  are  safely  injected  into the  body  and preferentially  bind  to the  cancer  cell,  defining  the  anatomical contour  of  the lesion  and  making it  visible.

•These  nanoparticles  give us  the  ability to  see  cells  and  molecules  that we  otherwise  cannot detect  through  conventional  imaging.  The  ability to  pick  up  what  happens  in the  cell  ,  to  monitor  therapeutic intervention  and  to  see  when a  cancer  cell  is  mortally  wounded or  is  actually activated  ,  is critical  to  the  successful  diagnosis  and treatment  of  the disease.

•Nanoparticulate  technology  can prove  to  be very  useful  in  cancer  therapy which is   effective  and targeted  drug  delivery  by  overcoming  the many  biological,  biophysical and  biomedical  barriers  that  the  body stages  against  a standard  intervention  such  as  the  administration  of drugs  or  contrast agents.

8.Gold nanoshells• Here use  of  Nanoparticle  based electrochemical  detector 

is done.  • Principle: A  standard  glass electrode  is  first coated  with 

chitosan, a  complex  sugar obtained  from  crab and  shrimp  shells, and  then  with  gold  nanoparticles.  The bold  nanoparticles  provide a  electrically  conductive  surface  upon  which cancer  cells  can stick without  damaging the  cells.  The  cancer  cells  can be  taken  from the  patient  and suspended  in  a  suitable  growth  solution.

• After cells  are  allowed to  bind  to the  electrode,  two monoclonal  antibodies  are added  to  the assay  solution.  The first  antibody  binds  to  glycoprotein, which  the  second cause an electrochemical reaction  to  occur  only if  the  first antibody  has  bound to  any  glycoprotein.  The electrochemical  reaction  triggers an  of  cells  with glycoprotein  present  on  their  surfaces.  

9.Nanobombs• the nanobomb holds great promise as a therapeutic agent for killing

cancer cells, with particular emphasis on breast cancer cells, because its shockwave kills the cancerous cells as well as the biological pathways that carry instructions to generate additional cancerous cells and the small veins that nourish the diseased cells. Also, it can be spread over a wide area to create structural damage to the cancer cells that are close by.

• The nanobombs are superior to a variety of current treatments because they are powerful, selective, non-invasive, nontoxic and can incorporate current technology, including microsurgery.

• An advantage over other carbon nanotube treatments being

considered by scientists is that with nanobombs, the carbon nanotubes are destroyed along with the cancer cells.

Future  goals  through  Nanotechnology  in  cancer  diagnosis  and  treatment:-

• Imaging  agents and  diagnostics  that will  allow  clinicians  to detect  cancer in  its  earliest stages. 

• Systems  that will  provide  real time  assessments  of therapeutic  and  surgical  efficacy  for  accelerating clinical  translation.

• Multifunctional  targeted devices  capable  of bypassing  biological  barriers  to  deliver  multiple therapeutic  agents  directly to  cancer  cells  and  those  tissues in  the  microenvironment  that play a critical  role  in  the growth  and  metastasis of cancer.

• Agents  that can  monitor  predictive molecular  changes and prevent  precancerous  cells from  becoming  malignant. • Novel  method’s to  manage  the symptoms  of  cancer  that

adversely  impact quality  of  life.  • Research  tools that  will  enable rapid  identification  of  new 

targets  for clinical  development  and predict  drug  resistance. 

Challenges Of Technology

• Today, much of the science on the nanoscale is basic research, designed to reach a better understanding of how matter behaves on this small scale.

• The surface area of nano-materials being large, the phenomena like friction and sticking are more important than they are in large systems. These factors will affect the use of nanomaterials both inside and outside the body.

• Nanostructures being so small; the body may clear them too rapidly to be effective in detection or imaging. Larger nanoparticles may accumulate in vital organs, creating a toxicity problem.

Conclusion• Nanotechnology  has  made the  diagnosis 

and treatment  of  cancer  easy,  safe,  and efficient.  Scientist  believe that  with  nanotechnology  it  would  be  possible to  turn  cancer   (life  threatening  disease) into  a  chronic and  manageable  disease.

 • Nanotechnology will radically change the way we

diagnose, treat and prevent cancer to help meet the goal of eliminating suffering and death from cancer.

• Although most of the technologies described are promising and fit well with the current methods of treatment, there are still safety concerns associated with the introduction of nanoparticles in the human body.

• These will require further studies before some of the products can be approved. The most promising methods of drug delivery in cancer will be those that combine diagnostics with treatment. These will enable personalized management of cancer and provide an integrated protocol for diagnosis and follow up that is so important in management of cancer patients. There are still many advances needed to improve nanoparticles for treatment of cancers.

• Future efforts will focus on identifying the mechanism and location of action for the vector and determining the general applicability of the vector to treat all stages of tumors in preclinical models. Further studies are focused on expanding the selection of drugs to deliver novel nanoparticle vectors. Hopefully, this will allow the development of innovative new strategies for cancer cures.