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Biodegradable Ultrasound Could Make Brain Cancers More Treatable

By MedImaging International staff writers
Posted on 15 Jun 2023

When a person is found to have a malignant brain tumor, the usual treatment is surgical removal followed by chemotherapy to eradicate any remaining cancer cells. However, brain cancers are notoriously resistant to chemotherapy, due to the blood-brain barrier, which is a protective membrane preventing large potentially harmful molecules from entering the brain. This same barrier also blocks beneficial chemo-drugs and other treatments from attacking brain cancer cells and treating other brain diseases. A safe and effective method of breaching the blood-brain barrier involves using ultrasound to vibrate cells sufficiently to create pores that allow the medication to pass through.

However, directing ultrasound through the thick human skull is challenging. Usually, numerous powerful ultrasound devices must be strategically positioned around the skull and accurately focused on the tumor's location with an MRI machine right after administering chemotherapy in a hospital setting. The procedure lasts about five to six hours and the intense ultrasound can damage tissues. The procedure is rarely conducted more than once, despite most patients with aggressive brain cancers undergoing chemotherapy for months. Utilizing ultrasound at each chemotherapy session would be significantly more effective. However, due to the complex nature of the MRI-ultrasound process, this is rarely done. Now, a revolutionary, biodegradable ultrasound, considerably more powerful than earlier models, could improve the treatment of brain cancers.

A device implanted directly in the brain can be used repeatedly to allow chemotherapy to permeate the brain and eliminate tumor cells. An implantable ultrasound device already exists in the market, but it's made of potentially toxic ceramic materials that require surgical removal post-treatment. Researchers at University of Connecticut (Storrs, CT, USA) had earlier built a safe, biodegradable piezoelectric ultrasound brain implant, although it wasn't as powerful as the traditional ceramic variants. In their latest research, the team employed a completely new method to create a biodegradable polymer ultrasound that is as powerful as ceramic models.

Initially, the researchers intended to use glycine crystals, an amino acid that's a common protein in the body and known for its strong piezoelectric properties. Glycine is safe and biodegradable, but it dissolves too quickly in water. Additionally, glycine piezoelectric crystals are brittle and shatter easily, which makes processing this material into a practical ultrasound device highly challenging. The researchers devised a unique solution: they grew glycine crystals, shattered them intentionally into pieces just a few hundred nanometers in size, and then spun them with polycaprolactone (PCL), a biodegradable polymer, to produce piezoelectric films composed of glycine and PCL nanofibers. These films can generate ultrasound at 334 kilo-Pascals under small voltage (~ 0.15 Vrms), similar to a ceramic ultrasound brain implant. They then coated the glycine-PCL film in other biodegradable polymers for protection. Poly-L-Lactide (PLLA), one potential coating, decomposes approximately in six weeks.

The researchers tested the device on mice with brain cancer, treating them with PTX (paclitaxel), a potent chemotherapy drug effective against brain cancer but difficult to pass through the blood-brain barrier. The glycine-PCL ultrasound successfully enabled PTX to cross the blood-brain barrier, reducing the tumors and doubling the lifespan of mice with brain cancer compared to those untreated. The combined treatment of glycine-PCL ultrasound and PTX was much more effective than using PTX alone, or PTX and ultrasound from the original, less powerful version of the biodegradable ultrasound device, based on PLLA. The team also conducted a six-month safety evaluation of the device implanted in the brain and found no negative impact on the health of the mice. The researchers now plan to test the safety and efficacy of the device in large animals.

Related Links:
University of Connecticut

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83 (25.98762512207): SELECT show_live FROM jos_com_show_setting LIMIT 1
84 (25.98762512207): SELECT show_live FROM jos_com_show_setting LIMIT 1
85 (26.941299438477): SELECT show_live FROM jos_com_show_setting LIMIT 1
86 (25.98762512207): SELECT show_live FROM jos_com_show_setting LIMIT 1
87 (25.98762512207): SELECT show_live FROM jos_com_show_setting LIMIT 1
88 (63.180923461914): SELECT fid FROM jos_deeppockets WHERE cat=10 AND id=294797574 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
89 (41.961669921875): SELECT fid FROM jos_deeppockets_archive WHERE cat=10 AND id=294797574 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
90 (33.855438232422): 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`
91 (118.01719665527): SELECT show_live FROM jos_com_show_setting LIMIT 1
92 (46.968460083008): SELECT show_live FROM jos_com_show_setting LIMIT 1
93 (209.09309387207): SELECT show_live FROM jos_com_show_setting LIMIT 1
94 (!!!!! 2995.0141906738): SELECT show_live FROM jos_com_show_setting LIMIT 1
95 (!!!!! 7611.9899749756): SELECT show_live FROM jos_com_show_setting LIMIT 1
96 (!!!!! 3764.1525268555): SELECT show_live FROM jos_com_show_setting LIMIT 1
97 (!!!!! 3343.1053161621): SELECT show_live FROM jos_com_show_setting LIMIT 1
98 (!!!!! 1177.0725250244): SELECT show_live FROM jos_com_show_setting LIMIT 1
99 (959.15794372559): SELECT show_live FROM jos_com_show_setting LIMIT 1
100 (308.99047851562): SELECT show_live FROM jos_com_show_setting LIMIT 1
101 (654.93583679199): SELECT show_live FROM jos_com_show_setting LIMIT 1
102 (!!!!! 2038.0020141602): SELECT show_live FROM jos_com_show_setting LIMIT 1
103 (524.99771118164): SELECT show_live FROM jos_com_show_setting LIMIT 1
104 (67.949295043945): SELECT show_live FROM jos_com_show_setting LIMIT 1
105 (!!!!! 1368.0458068848): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294797574 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294797574 AND published='1' LIMIT 1
106 (89.883804321289): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294797574 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294797574 AND published='1' LIMIT 1
107 (322.10350036621): 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=294797574 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
108 (730.03768920898): 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=294797574 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
109 (!!!!! 2337.9325866699): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294797574 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294797574 AND published='1' LIMIT 1
110 (97.990036010742): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294797574 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294797574 AND published='1' LIMIT 1
111 (172.85346984863): 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=294797574 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
112 (!!!!! 1240.9687042236): 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=294797574 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
113 (!!!!! 2830.982208252): 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 (!!!!! 3855.9436798096): 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
115 (!!!!! 8265.0184631348): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294797574 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294797574 AND published='1' LIMIT 1
116 (154.01840209961): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294797574 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294797574 AND published='1' LIMIT 1
117 (!!!!! 1488.9240264893): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294797574 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294797574 AND published='1' LIMIT 1
118 (810.14633178711): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294797574 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294797574 AND published='1' LIMIT 1
119 (!!!!! 3255.8441162109): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294797574 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294797574 AND published='1' LIMIT 1
120 (888.10920715332): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294797574 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294797574 AND published='1' LIMIT 1
121 (!!!!! 4154.9205780029): SELECT * FROM trending_articles WHERE `journal_id` = 10 AND `timestamp` <= NOW() + INTERVAL 7 DAY ORDER BY `order`
122 (!!!!! 60119.152069092): 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
123 (!!!!! 2379.8942565918): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294797574 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294797574 AND published='1' LIMIT 1
124 (!!!!! 1668.9300537109): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294797574 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294797574 AND published='1' LIMIT 1
125 (!!!!! 5281.925201416): SELECT fid FROM jos_deeppockets WHERE cat=10 AND id=294797574 AND type='deeppockets_item' AND published='1' union SELECT fid FROM jos_deeppockets_archive WHERE cat=10 AND id=294797574 AND type='deeppockets_item' AND published='1' LIMIT 1
126 (!!!!! 1717339.9925232): ( 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 (!!!!! 1951487.0643616): ( 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
128 (963.21105957031): SELECT dp.id, dp.name, dp.title, dp.video, dp.video_source, dp.created FROM jos_deeppockets AS dp WHERE dp.id = 294800513 LIMIT 1
129 (74.863433837891): SELECT dp.id, dp.name, dp.title, dp.video, dp.video_source, dp.created FROM jos_deeppockets AS dp WHERE dp.id = 294800513 LIMIT 1
130 (664.94941711426): SELECT dp.id, dp.name, dp.title, dp.video, dp.video_source, dp.created FROM jos_deeppockets AS dp WHERE dp.id = 294800359 LIMIT 1
131 (340.93856811523): SELECT dp.id, dp.name, dp.title, dp.video, dp.video_source, dp.created FROM jos_deeppockets AS dp WHERE dp.id = 294800359 LIMIT 1
132 (604.86793518066): SELECT dp.id, dp.name, dp.title, dp.video, dp.video_source, dp.created FROM jos_deeppockets AS dp WHERE dp.id = 294800361 LIMIT 1
133 (45.061111450195): SELECT dp.id, dp.name, dp.title, dp.video, dp.video_source, dp.created FROM jos_deeppockets AS dp WHERE dp.id = 294800361 LIMIT 1
134 (329.01763916016): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294797574 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
135 (310.89782714844): SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294797574 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
136 (159.02519226074): SELECT name FROM jos_deeppockets WHERE id=214
137 (97.990036010742): SELECT name FROM jos_deeppockets WHERE id=214
138 (719.07043457031): 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 '((;)|(^))214((;)|($))' AND catid IN (0,110) ORDER BY publish_up ASC LIMIT 3
139 (576.01928710938): SELECT *, DATE_FORMAT(publish_up,'%d %b %Y') AS date_publish_up, DATE_FORMAT(publish_down,'%d %b %Y') AS date_publish_down FROM jos_events WHERE state=1 AND publish_up > NOW() and extra_info REGEXP '((;)|(^))214((;)|($))' AND catid IN (0,110) ORDER BY publish_up ASC LIMIT 3
140 (!!!!! 9361.0286712646): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294797574 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294797574 AND published='1' LIMIT 1
141 (209.09309387207): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294797574 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294797574 AND published='1' LIMIT 1
142 (!!!!! 8052.1106719971): TRUNCATE TABLE jos_trademed_module
143 (799.89433288574): 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=294797574 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
144 (590.08598327637): 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=294797574 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
145 (491.14227294922): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294797574 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
146 (67.949295043945): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294797574 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
147 (77.009201049805): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294797574 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294797574 AND published='1' LIMIT 1
148 (55.074691772461): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294797574 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294797574 AND published='1' LIMIT 1
149 (!!!!! 1541.1376953125): 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
150 (675.91667175293): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294797574 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294797574 AND published='1' LIMIT 1
151 (126.12342834473): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294797574 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294797574 AND published='1' LIMIT 1
152 (!!!!! 2681.9705963135): SELECT fid FROM jos_deeppockets WHERE cat=10 AND id=294797574 AND type='deeppockets_item' AND published='1' union SELECT fid FROM jos_deeppockets_archive WHERE cat=10 AND id=294797574 AND type='deeppockets_item' AND published='1' LIMIT 1
153 (!!!!! 1760.0059509277): 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=214 or channel_id is null)
154 (211.00044250488): 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=214 or channel_id is null)
155 (107.0499420166): SELECT livesite FROM jos_dp_categories WHERE id=10 AND published='1' LIMIT 1
156 (218.15299987793): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294797574 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294797574 AND published='1' LIMIT 1
157 (107.0499420166): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294797574 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294797574 AND published='1' LIMIT 1
158 (158.07151794434): select jos_twitters.link from jos_twitters where cat=10
159 (66.041946411133): select jos_facebook.link from jos_facebook where cat=10
160 (40.054321289062): select jos_google_plus.link from jos_google_plus where cat=10
161 (36.001205444336): select jos_linkedin.link from jos_linkedin where cat=10
162 (495.91064453125): update jos_bannersmanager_banner set impmade=impmade+1 where id in(14615,14202,14203)
163 (!!!!! 1304.1496276855): insert into jos_banners_delta values (14615,'2025-04-30 07:57:47','3.145.152.98','view'),(14202,'2025-04-30 07:57:47','3.145.152.98','view'),(14203,'2025-04-30 07:57:47','3.145.152.98','view')