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Novel Target for Drug May Improve Effectiveness of Radiation Therapy

By MedImaging International staff writers
Posted on 13 Oct 2010
Image: Inhibition of the enzyme cPLA2 leads to collapsed vessels, stopping blood flow to the tumor (photo courtesy Washington University in St. Louis).
Image: Inhibition of the enzyme cPLA2 leads to collapsed vessels, stopping blood flow to the tumor (photo courtesy Washington University in St. Louis).
Scientists have found a new drug target that could improve the effectiveness of radiation for hard-to-treat cancers.

The study's findings, published online August 20, 2010, in the Journal of the National Cancer Institute, focuses on the role of the enzyme cytosolic phospholipase A2 (cPLA2). This enzyme promotes development and functioning of blood vessel networks that feed malignant tumors, enabling them to overcome the effects of radiation. They have also identified a drug that blocks production of the enzyme. Inhibiting the enzyme can stop the flow of blood tumors need to survive.

Tumors thrive and spread due to a unique ability to recruit networks of new blood vessels that penetrate into tumors, bringing oxygen, nutrients,and potentially transporting cancer cells to other areas of the body. Cancer cells trigger the process of new blood vessel construction, called angiogenesis, by releasing specific molecules into surrounding normal tissue, initiating a cascade of molecular signals that cause cells lining existing blood vessels to divide and create new vessels. These new vessel networks link the tumor to the circulatory system and its life-sustaining cargo.

Lung cancer and glioblastoma, the most common type of primary brain tumor, are particularly skillful at inducing new blood vessel creation via angiogenesis. They are also highly resistant to treatment by radiation. "Our original objective was to measure the signaling molecules that enable lung and brain cancer to be resistant to radiation,” noted Dennis Hallahan, M.D., a professor of medicine and chair of the department of radiation oncology at Washington University School of Medicine in St. Louis (MO, USA) and senior author of the study. "There are hundreds of signaling molecules, but the enzyme cPLA2 stood out,” Dr. Hallahan stated. "Radiation of tumor cells triggers production of cPLA2 within two minutes and it contributes to tumor survival.”

The cPLA2 enzyme is known to regulate the levels of at last three molecules that promote tumor angiogenesis (the creation of new blood vessel networks to feed cancer cells). The researchers set out to learn if they could enhance the effect of radiation therapy for lung and brain cancers by inhibiting this enzyme. The plan was to implant tumors into normal mice and into mice that had been genetically engineered to be unable to produce cPLA2 and then compare the effect of radiation therapy on tumor progression in each.

The enormous power of cPLA2 became apparent to Dr. Hallahan when a graduate student complained that her experiment failed because she could not grow tumors in mice that lacked the gene that produces cPLA2. "While implanted tumors progressed as expected in normal mice used in the experiment, they were virtually undetectable in cPLA2-deficient mice,” Dr. Hallahan stated. "The ‘failed experiment' was actually a significant discovery of the enormous control cPLA2 has in regulating tumor angiogenesis.”

The scientists then studied the blood vessels of the cPLA2-deficient mice. Whereas the blood vessels of cPLA2-deficient mice appeared normal, close inspection revealed the absence of a specific type of contractile cell that regulates blood flow. "Without these cells, blood vessels can still grow into the tumor but blood cannot flow to the tumor,” Dr. Hallahan stated. "Cancer cannot survive without blood flow to feed it.”

The essential role of cPLA2 in determining the presence or absence of these contractile cells makes it a prime target for interventional therapy. "Drugs that target cPLA2 have enormous potential for improving the success of radiation against highly angiogenic tumors,” Dr. Hallahan said.

Dr. Hallahan has already identified an existing drug that inhibits cPLA2. It is a compound originally developed by Wyeth (Madison, NJ, USA), now part of Pfizer (New York, NY, USA), as a treatment for arthritis. The drug had advanced to phase II testing before being discontinued as a potential arthritis treatment. Reaching phase II testing, however, suggests that a compound has been proven safe, regardless of whether or not it meets performance standards for the specific medical condition for which it was made. These drugs are typically then tested for other uses.

Dr. Hallahan learned of the Pfizer compound from a partnership between Pfizer and Washington University that allows Washington University scientists to evaluate extensive research data on a large range of Pfizer pharmaceutical candidates that are or were in clinical testing.

Don Frail, Ph.D., chief scientific officer of Pfizer's Indication's Discovery Unit, reported that most of drug candidates tested in development do not give the desired result. "Yet those drugs that do succeed typically have multiple uses,” Dr. Frail said. "Hallahan's research has led to an entirely new potential use for one of these compounds in an area of high patient need that otherwise might have been overlooked. This is exactly what our partnership with Washington University is about and is among the first to be funded through the new relationship.”

Dr. Hallahan is currently collaborating with Craig Wegner, Ph.D., in the Indications Discovery Unit of Pfizer to understand further the pathways impacted by cPLA2 and to assess the drug that suppresses its action.

Related Links:

Washington University School of Medicine in St. Louis
Pfizer



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87 (60.081481933594): SELECT fid FROM jos_deeppockets WHERE cat=10 AND id=294731558 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
88 (40.054321289062): SELECT fid FROM jos_deeppockets_archive WHERE cat=10 AND id=294731558 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
89 (50.067901611328): SELECT id,name,title FROM jos_deeppockets WHERE cat=10 AND TYPE='file_folder' AND published=1 AND id != 294743300 AND id != 294743301 AND id != 294743302 AND id != 294743303 AND id != 294743304 AND id != 294743305 AND id != 294743306 AND id != 294743307 AND id != 294743308 AND id != 294743309 AND id != 294743310 AND metakey != 'aacc' ORDER BY `ordering`
90 (94.890594482422): SELECT show_live FROM jos_com_show_setting LIMIT 1
91 (48.160552978516): SELECT show_live FROM jos_com_show_setting LIMIT 1
92 (36.001205444336): SELECT show_live FROM jos_com_show_setting LIMIT 1
93 (67.949295043945): SELECT show_live FROM jos_com_show_setting LIMIT 1
94 (35.04753112793): SELECT show_live FROM jos_com_show_setting LIMIT 1
95 (30.994415283203): SELECT show_live FROM jos_com_show_setting LIMIT 1
96 (46.968460083008): SELECT show_live FROM jos_com_show_setting LIMIT 1
97 (30.040740966797): SELECT show_live FROM jos_com_show_setting LIMIT 1
98 (27.894973754883): SELECT show_live FROM jos_com_show_setting LIMIT 1
99 (37.908554077148): SELECT show_live FROM jos_com_show_setting LIMIT 1
100 (36.001205444336): SELECT show_live FROM jos_com_show_setting LIMIT 1
101 (28.848648071289): SELECT show_live FROM jos_com_show_setting LIMIT 1
102 (36.001205444336): SELECT show_live FROM jos_com_show_setting LIMIT 1
103 (40.054321289062): SELECT show_live FROM jos_com_show_setting LIMIT 1
104 (85.830688476562): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294731558 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294731558 AND published='1' LIMIT 1
105 (48.87580871582): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294731558 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294731558 AND published='1' LIMIT 1
106 (77.009201049805): SELECT dp.*, ch.title as channel, exp.name as author_name, exp.specialization as author_specialization, exp.images as author_photo FROM jos_deeppockets as dp LEFT JOIN jos_experts as exp ON exp.id = dp.author LEFT JOIN jos_deeppockets as ch ON dp.fid = ch.id WHERE 1=1 AND dp.cat=10 AND dp.id=294731558 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
107 (61.03515625): SELECT dp.*, ch.title as channel, exp.name as author_name, exp.specialization as author_specialization, exp.images as author_photo FROM jos_deeppockets_archive as dp LEFT JOIN jos_experts as exp ON exp.id = dp.author LEFT JOIN jos_deeppockets as ch ON dp.fid = ch.id WHERE 1=1 AND dp.cat=10 AND dp.id=294731558 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
108 (111.10305786133): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294731558 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294731558 AND published='1' LIMIT 1
109 (67.949295043945): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294731558 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294731558 AND published='1' LIMIT 1
110 (89.883804321289): SELECT dp.*, ch.title as channel, exp.name as author_name, exp.specialization as author_specialization, exp.images as author_photo FROM jos_deeppockets as dp LEFT JOIN jos_experts as exp ON exp.id = dp.author LEFT JOIN jos_deeppockets as ch ON dp.fid = ch.id WHERE 1=1 AND dp.id=294731558 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
111 (743.86596679688): SELECT dp.*, ch.title as channel, exp.name as author_name, exp.specialization as author_specialization, exp.images as author_photo FROM jos_deeppockets_archive as dp LEFT JOIN jos_experts as exp ON exp.id = dp.author LEFT JOIN jos_deeppockets as ch ON dp.fid = ch.id WHERE 1=1 AND dp.id=294731558 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
112 (656.8431854248): SELECT dp.name, dp.id, dp2.name as channel, ex.name as author_name, ex.specialization, ex.images FROM jos_deeppockets as dp LEFT JOIN jos_experts as ex ON ex.id = dp.author LEFT JOIN jos_deeppockets as dp2 ON dp2.id = dp.fid WHERE dp.author != 0 AND dp.cat = 10 AND dp.published = 1 AND ( (dp.fid = 294743300) OR (dp.fid = 294743301) OR (dp.fid = 294743302) OR (dp.fid = 294743303) OR (dp.fid = 294743304) OR (dp.fid = 294743305) OR (dp.fid = 294743306) OR (dp.fid = 294743307) OR (dp.fid = 294743308) OR (dp.fid = 294743309) OR (dp.fid = 294743310) ) ORDER BY RAND() LIMIT 1
113 (535.96496582031): SELECT dp.name, dp.id, dp2.name as channel, ex.name as author_name, ex.specialization, ex.images FROM jos_deeppockets as dp LEFT JOIN jos_experts as ex ON ex.id = dp.author LEFT JOIN jos_deeppockets as dp2 ON dp2.id = dp.fid WHERE dp.author != 0 AND dp.cat = 10 AND dp.published = 1 AND ( (dp.fid = 294743300) OR (dp.fid = 294743301) OR (dp.fid = 294743302) OR (dp.fid = 294743303) OR (dp.fid = 294743304) OR (dp.fid = 294743305) OR (dp.fid = 294743306) OR (dp.fid = 294743307) OR (dp.fid = 294743308) OR (dp.fid = 294743309) OR (dp.fid = 294743310) ) ORDER BY RAND() LIMIT 1
114 (123.02398681641): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294731558 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294731558 AND published='1' LIMIT 1
115 (55.074691772461): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294731558 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294731558 AND published='1' LIMIT 1
116 (52.928924560547): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294731558 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294731558 AND published='1' LIMIT 1
117 (37.193298339844): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294731558 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294731558 AND published='1' LIMIT 1
118 (61.988830566406): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294731558 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294731558 AND published='1' LIMIT 1
119 (37.193298339844): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294731558 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294731558 AND published='1' LIMIT 1
120 (45.061111450195): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294731558 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294731558 AND published='1' LIMIT 1
121 (61.988830566406): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294731558 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294731558 AND published='1' LIMIT 1
122 (336.88545227051): SELECT * FROM trending_articles WHERE `journal_id` = 10 AND `timestamp` <= NOW() + INTERVAL 7 DAY ORDER BY `order`
123 (!!!!! 25814.056396484): SELECT * FROM jos_deeppockets WHERE jos_deeppockets.cat = 10 AND jos_deeppockets.type = 'deeppockets_item' AND jos_deeppockets.published = 1 AND jos_deeppockets.created + INTERVAL 14 DAY >= NOW() ORDER BY jos_deeppockets.hits DESC LIMIT 7
124 (498.77166748047): SELECT fid FROM jos_deeppockets WHERE cat=10 AND id=294731558 AND type='deeppockets_item' AND published='1' union SELECT fid FROM jos_deeppockets_archive WHERE cat=10 AND id=294731558 AND type='deeppockets_item' AND published='1' LIMIT 1
125 (!!!!! 8530.1399230957): ( SELECT dp.id, dp.name, dp.title, dp.video, dp.video_source, dp.created FROM jos_deeppockets AS dp WHERE dp.video != '' AND dp.video_source != '' AND dp.cat = 10 AND dp.published = 1 AND dp.type != 'deeppockets_item_link' ORDER BY created DESC LIMIT 3 ) UNION ( SELECT dpa.id, dpa.name, dpa.title, dpa.video, dpa.video_source, dpa.created FROM jos_deeppockets_archive AS dpa WHERE dpa.video != '' AND dpa.video_source != '' AND dpa.cat = 10 AND dpa.published = 1 AND dpa.type != 'deeppockets_item_link' ORDER BY created DESC LIMIT 3 ) ORDER BY created DESC LIMIT 3
126 (123.97766113281): ( SELECT dp.id, dp.name, dp.title, dp.video, dp.video_source, dp.created FROM jos_deeppockets AS dp WHERE dp.video != '' AND dp.video_source != '' AND dp.cat = 10 AND dp.published = 1 AND dp.type != 'deeppockets_item_link' ORDER BY created DESC LIMIT 3 ) UNION ( SELECT dpa.id, dpa.name, dpa.title, dpa.video, dpa.video_source, dpa.created FROM jos_deeppockets_archive AS dpa WHERE dpa.video != '' AND dpa.video_source != '' AND dpa.cat = 10 AND dpa.published = 1 AND dpa.type != 'deeppockets_item_link' ORDER BY created DESC LIMIT 3 ) ORDER BY created DESC LIMIT 3
127 (77.009201049805): SELECT dp.id, dp.name, dp.title, dp.video, dp.video_source, dp.created FROM jos_deeppockets AS dp WHERE dp.id = 294803337 LIMIT 1
128 (46.014785766602): SELECT dp.id, dp.name, dp.title, dp.video, dp.video_source, dp.created FROM jos_deeppockets AS dp WHERE dp.id = 294803337 LIMIT 1
129 (87.976455688477): SELECT dp.id, dp.name, dp.title, dp.video, dp.video_source, dp.created FROM jos_deeppockets AS dp WHERE dp.id = 294803276 LIMIT 1
130 (46.968460083008): SELECT dp.id, dp.name, dp.title, dp.video, dp.video_source, dp.created FROM jos_deeppockets AS dp WHERE dp.id = 294803276 LIMIT 1
131 (410.07995605469): SELECT dp.id, dp.name, dp.title, dp.video, dp.video_source, dp.created FROM jos_deeppockets_archive AS dp WHERE dp.id = 294803276 LIMIT 1
132 (82.015991210938): SELECT dp.id, dp.name, dp.title, dp.video, dp.video_source, dp.created FROM jos_deeppockets_archive AS dp WHERE dp.id = 294803276 LIMIT 1
133 (62.942504882812): SELECT dp.id, dp.name, dp.title, dp.video, dp.video_source, dp.created FROM jos_deeppockets AS dp WHERE dp.id = 294802958 LIMIT 1
134 (42.915344238281): SELECT dp.id, dp.name, dp.title, dp.video, dp.video_source, dp.created FROM jos_deeppockets AS dp WHERE dp.id = 294802958 LIMIT 1
135 (524.99771118164): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294731558 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
136 (418.90144348145): SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294731558 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
137 (43.869018554688): SELECT name FROM jos_deeppockets WHERE id=213
138 (47.922134399414): SELECT name FROM jos_deeppockets WHERE id=213
139 (854.9690246582): SELECT *, DATE_FORMAT(publish_up,'%d %b %Y') AS date_publish_up, DATE_FORMAT(publish_down,'%d %b %Y') AS date_publish_down FROM jos_events WHERE state=1 AND publish_up > NOW() and extra_info REGEXP '((;)|(^))213((;)|($))' AND catid IN (0,110) ORDER BY publish_up ASC LIMIT 3
140 (708.10317993164): SELECT *, DATE_FORMAT(publish_up,'%d %b %Y') AS date_publish_up, DATE_FORMAT(publish_down,'%d %b %Y') AS date_publish_down FROM jos_events WHERE state=1 AND publish_up > NOW() and extra_info REGEXP '((;)|(^))213((;)|($))' AND catid IN (0,110) ORDER BY publish_up ASC LIMIT 3
141 (106.0962677002): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294731558 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294731558 AND published='1' LIMIT 1
142 (58.889389038086): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294731558 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294731558 AND published='1' LIMIT 1
143 (!!!!! 11008.024215698): TRUNCATE TABLE jos_trademed_module
144 (98.943710327148): SELECT dp.*, ch.title as channel, exp.name as author_name, exp.specialization as author_specialization, exp.images as author_photo FROM jos_deeppockets as dp LEFT JOIN jos_experts as exp ON exp.id = dp.author LEFT JOIN jos_deeppockets as ch ON dp.fid = ch.id WHERE 1=1 AND dp.cat=10 AND dp.id=294731558 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
145 (57.93571472168): SELECT dp.*, ch.title as channel, exp.name as author_name, exp.specialization as author_specialization, exp.images as author_photo FROM jos_deeppockets_archive as dp LEFT JOIN jos_experts as exp ON exp.id = dp.author LEFT JOIN jos_deeppockets as ch ON dp.fid = ch.id WHERE 1=1 AND dp.cat=10 AND dp.id=294731558 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
146 (900.0301361084): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294731558 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
147 (267.02880859375): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294731558 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
148 (729.08401489258): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294731558 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294731558 AND published='1' LIMIT 1
149 (178.09867858887): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294731558 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294731558 AND published='1' LIMIT 1
150 (!!!!! 1513.0043029785): SELECT jos_item.* FROM jos_item INNER JOIN jos_number ON jos_item.numberID=jos_number.id WHERE 1=1 AND (jos_item.imgMini<>'') AND jos_item.type='L' AND jos_item.numberID= ( SELECT jos_number.id FROM jos_number WHERE jos_number.journalID IN (10) and jos_number.id in (select distinct jos_number.id from jos_number join jos_item on jos_item.numberid=jos_number.id where jos_item.type='P') ORDER BY (CONVERT(SUBSTRING(issue,1,2),SIGNED) + (CONVERT(SUBSTRING(issue,3,2),SIGNED)*100)) DESC LIMIT 0,1 ) ORDER BY RAND() DESC LIMIT 6
151 (72.956085205078): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294731558 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294731558 AND published='1' LIMIT 1
152 (813.96102905273): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294731558 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294731558 AND published='1' LIMIT 1
153 (725.98457336426): SELECT fid FROM jos_deeppockets WHERE cat=10 AND id=294731558 AND type='deeppockets_item' AND published='1' union SELECT fid FROM jos_deeppockets_archive WHERE cat=10 AND id=294731558 AND type='deeppockets_item' AND published='1' LIMIT 1
154 (51.021575927734): select distinct links.* from jos_textlinks links join jos_textlinks_placement placement on links.id=placement.link_id where journal_id=(10) and (channel_id=213 or channel_id is null)
155 (197.8874206543): select distinct links.* from jos_textlinks links join jos_textlinks_placement placement on links.id=placement.link_id where journal_id=(10) and (channel_id=213 or channel_id is null)
156 (!!!!! 1204.0138244629): SELECT livesite FROM jos_dp_categories WHERE id=10 AND published='1' LIMIT 1
157 (!!!!! 3278.0170440674): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294731558 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294731558 AND published='1' LIMIT 1
158 (!!!!! 1687.0498657227): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294731558 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294731558 AND published='1' LIMIT 1
159 (47.922134399414): select jos_twitters.link from jos_twitters where cat=10
160 (!!!!! 2519.8459625244): select jos_facebook.link from jos_facebook where cat=10
161 (57.220458984375): select jos_google_plus.link from jos_google_plus where cat=10
162 (30.994415283203): select jos_linkedin.link from jos_linkedin where cat=10