Upload
val
View
44
Download
0
Tags:
Embed Size (px)
DESCRIPTION
Controlling Cancer. Shaenah Maguire, Sam Joswiak, Jim Slogar, Erin Lawrence. Estimated US Cancer Cases (2009). Men: 766,130. Women: 713,220. Prostate 25% Lung & bronchus 15% Colon & rectum 10% Urinary bladder 7% Melanoma of skin 5% - PowerPoint PPT Presentation
Citation preview
Controlling Cancer
Shaenah Maguire, Sam Joswiak, Jim Slogar, Erin Lawrence
Estimated US Cancer Cases (2009)
Prostate 25%
Lung & bronchus 15%
Colon & rectum 10%
Urinary bladder 7%
Melanoma of skin 5%
Non-Hodgkin lymphoma 5%
Kidney & renal pelvis 5%
Leukemia 3%
Oral cavity 3%
Pancreas 3%
All Other Sites 19%
Men: 766,130 Women: 713,220
27% Breast
14% Lung & bronchus
10% Colon & rectum
6% Uterine corpus
4% Non-Hodgkin lymphoma
4% Melanoma of skin
4% Thyroid
3% Kidney & renal pelvis
3% Ovary
3% Pancreas
22% All Other Sites
SMART Team
Students Modeling A Research Topic
Our Goal…
To understand cell processes, and the differences for cancer cells
Model and describe how cancer can be controlled
Project
Part I– Write a 200-250 word abstract describing how tyrosine kinase
domain of the epidermal growth factor receptor functions in normal cell division, and what role this protein plays in breast cancer. The abstract should also address the role that the inhibitor, lapatinib, plays in treating women with breast cancer
Part II– Design a model of the tyrosine kinase domain of the epidermal
growth factor receptor using the parameter set forth in the Qualification Challenge
Project Continued..
Part III– Write a 200-250 word abstract describing the
function of the Ras and its role in the cell signaling pathway to induce cell division
Part IV– Design a model of the GTP Binding Domain
Normal Cell Processes
EGFR
A signal is received by one of many EGFR (Epidermal Growth Factor Receptors) of a cell
It binds with another EGFR, activating the tyrosine kinase enzymes
EGFR
Tyrosine kinase
Tyrosine Kinase
Used to transmit signals and control cell processes
Includes growth, differentiation, metabolism, adhesion, motility, death
GRB2-SOS Activation
The 6 tyrosine kinases of EGFR become phosphlorated
Proteins such as GRB2-
SOS bind to it, becoming active
http://www.expertreviews.org/02004441h.htm
RAS
RAS releases GDP which is exchanged for GTP
GTP binds to RAS, activating it
http://jkweb.mcb.berkeley.edu/external/research-in-progress/5-3/signaling/ras_sos_schematic1.jpg
Into the Nucleus..
This activates raf-1, then MEK and MPKA, which goes into the nucleus & tells it to divide
Growth factors and map kinase Growth factors and map kinase
Fig. 14 Fig. 14 - - 18 18
Steps missing
Jun is part of
AP - 1.
Abnormal Cell Growth
Cancer abilities
Uncontrolled replication- doesn’t need signals
No signal to die (apoptosis)
Can metastasize- move to other parts of the body
Ways to Control Cancer…
Options
Mastectomy (breast cancer)
Removal of Tumor Chemotherapy Radiation Therapy Drugs
Hormone Therapy
Block or lower the effect
of estrogen receptors on breast cancer cells
– Tamoxifen and toremifene (Fareston): Temporarily blocks estrogen receptors, helps reduce risk of developing breast cancer
Biological Therapy
Uses Immune system– Make cancer cells more
recognizable– Enhance the body's
ability to repair or replace normal cells
– Prevent cancer cells from spreading
Targeted Therapy
Use drugs that block the growth and spread of cancer.
– Lapatinib: Control Breast Cancer; EGFR inhibitor
http://www.nature.com/nrclinonc/journal/v3/n5/images/ncponc0509-f1.jpg
How are drugs selected? How can it be predicted which drugs might work?
Xray Crystallography
•Bombard a sample with Xrays
•leaves an “image where the density is greater.
•This is where the atoms must be located.
• Different atoms have different densities.
•http://upload.wikimedia.org/wikipedia/en/thumb/e/e3/X-ray_crystallography.svg/691px-X-ray_crystallography.svg.png
http://en.wikipedia.org/wiki/Image:X_ray_diffraction.png#file
Steps in Determining a
Protein’s Structure Using X-Ray
Crystallography
•Relate to EGFR and the drugs..
X Ray Crystallography data obtained
from the Protein Data Bank
Notice the X,Y, Z coordinates are given for each atom from the Xray Data
Rasmol Program used
– to make the models– Manipulate the
molecules– Uses xray
crystallography information from a world-wide data bank showing various protein structures.
We used 1XKK (EGFR) and 5P21 (RAS)
EGFR
FMM
Drug’s Impact
Lapatinib
Blocks signaling in EGFR
Falls out at a certain point, so the cell doesn’t just die
Other Drugs…
ErbB enzyme Inhibition by Compounds in Clinical Development Ki values
a=Kiapp, b=IC50, c=cKiapp(nM)
Compound EGFR ErbB-2 ErbB-4
GW 3 13 347
ZD 0.4 870 1130
OSI 0.7 1000 1530
CI 30 127 388
RAS (activated)
*Looking for a drug to fit in here, help with abnormal signaling
*Cover it to prevent GTP from going there
Modeling…Importance
Here are two different ways that cancer is attempted to be blocked…
X-ray crystallography and its associated modeling have allowed people to make predictions as to what chemicals/drugs might work for treatment, how diseases such as cancer can be treated.
Conclusion
Modeling helps visualize Shared some possible treatments Hopefully we have given you a better image as
to how cancer is combated, how modeling helps…
A Special Thanks to…
Dr. Shannon Colton, Dr. Margaret Franzen,
Dr. Tim Herman Center for Biological Modeling, Milwaukee
School of Engineering, Thanks to Brandon Radloff and Jon Hohol
for their initial help in Rasmol trainingMr. Heeren
Bibliography
“1XKK.” RCSB Protein Data Bank. RCSB. 22 Apr. 2009
<http://www.rcsb.org/pdb/explore.do?structureId=1XKK>. “5P21.” RCSB Protein Data Bank. RCSB. 22 Apr. 2009
<http://www.rcsb.org/pdb/explore/explore.do?structureId=5P21>. “Biotherapy / Immunotherapy.” Cancer Treatment Centers of America. Cancer
Treatment Centers of America. 29 Apr. 2009 <http://www.cancercenter.com/conventional-cancer-treatment/biotherapy-immunotherapy.cfm?source=googlemw&c=Google_Midwest_Core:General_Biological_Therapy:biological_therapy:Exact&ef_id=1812:3:s_94578445c51ff44f08be23993ba17125_2607217011:gCHM1UGvMaAAABgVdPcAAAAN:20090429121300>.
“Chemical Communication in Cells.” Biology of Cancer. University of Colorado. 22 Apr. 2009 <http://mama.uchsc.edu/vc/cancer/signal/p1.cfm>.
Cloford. “500+ Colors.” Cloford.com. 2000. Cloford. 22 Apr. 2009 <http://cloford.com/resources/colours/500col.htm>.
Bibliography Continued
Goodsell, David S. “The Molecular Perspective: Epidermal Growth Factor.” The Oncologist. 2003. AlphaMed Press. 22 Apr. 2009 <http://theoncologist.alphamedpress.org/cgi/content/full/8/5/496#F1>.
“Hormonal Therapy.” BreastCancer.Org. 27 Feb. 2009. BreastCancer.Org. 29 Apr. 2009 <http://www.breastcancer.org/treatment/hormonal/>.
“MAP Kinase Pathways.” Biocreations. 2006. Biocreations. 22 Apr. 2009 <http://www.biocreations.com/animations/MAP_Kinase.swf>.
– RasMol. RasMol. 21 Mar. 2008. 22 Apr. 2009 <http://www.openrasmol.org/>. “Receptor Tyrosine Kinase Animation.” Wiley. Wiley. 22 Apr. 2009
<http://www.wiley.com/college/fob/quiz/quiz21/21-15.html>. “Targeted Cancer Therapies: Questions and Answers.” National Cancer Institute.
National Cancer Institute. 29 Apr. 2009 <http://www.cancer.gov/cancertopics/factsheet/Therapy/targeted>.