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Low-Intensity Ultrasound Could Boost Tissue Implant Success

By MedImaging International staff writers
Posted on 29 Jun 2010
While ultrasound imaging typically requires frequencies that are 50 to 2,500 times higher than those human ear can detect, recent increasing evidence indicates that ultrasound at lower frequency can also be utilized to help specific body tissues to heal and regenerate. Now research suggests that ultrasound could also help tissue grafts to survive and thrive following surgery.

Ultrasound can improve cell viability, due to its ability to get molecules moving, and researchers have used it to increase blood flow to tissues in the process of healing and regenerating. Specifically, low-intensity ultrasound (LIUS) has been used to help regenerate cartilage and bone, and in tissue engineering to stimulate cells.

Surgeons use a patient's own fatty tissue (adipose tissue) in procedures including facial plastic surgery, treating burn victims, breast reconstruction, and surgery on the vocal cords. However, how well these tissue grafts survive can vary, and the time period after the surgery before a blood supply is reestablished is particularly crucial. If the graft does not get sufficient oxygen and glucose, and clear away waste, the grafted tissue will wither and die.

An international team of investigators, including researchers from Massachusetts Institute of Technology (MIT; Cambride, USA), the Center for Laryngeal Surgery and Voice Rehabilitation at Massachusetts General Hospital (Boston, MA, USA) and Ben Gurion University (Be'er Sheva, Israel), set out to evaluate whether ultrasound could improve the viability of grafted tissue during the postoperative period.

The researchers used adipose cells cultured from tissue left over from tummy-tuck operations as well as mouse muscle cells (C2C12 cells) for their experiments. Over a six-day period, the test cells were treated with LIUS at 30 mW/cm2 for short bursts of three or ten minutes. They assayed for the number of cells, metabolism (by observing how much glucose they consumed and how much lactate they produced), viability, and for signs of damage to the cells.

The C2C12 muscle cells stimulated with LIUS showed greater cell numbers and better viability than controls. Moreover, for the first time the researchers obtained preliminary evidence that LIUS can influence the viability of the cultured adipose cells (known as organoids) in an in vitro organ culture model. Adipose tissue treated with LIUS demonstrated considerably increased metabolic activity, and had fewer markers for tissue damage than tissue not treated with LIUS.

If the technique was used on a patient, the way that ultrasound might enhance molecular motion would probably depend on local variations in tissue density. "Depending on the location of the probe, one can expect variable effects of LIUS,” stated senior author Steven Zeitels, M.D., director of the Center for Laryngeal Surgery and Voice Rehabilitation.

It is also not clear whether the increased metabolic activity and proliferation of the cells seen in this experiment was simply due to LIUS's mechanical and thermal effect in stimulating molecules to move around more. "In the context of using LIUS to enhance autograft survival, the possibility that the LIUS can directly activate signaling pathways in implanted cells needs to be taken into account. It may eventually be possible to manipulate cellular responses by fine-tuning this technique,” said lead author Hyoungshin Park, Ph.D., from MIT.

According to the investigators, it is still not known whether these laboratory findings will be validated in in-vivo studies, but these early results suggest important avenues to pursue in efforts to improve graft survival.

The study was published online in May 2010 in the Journal of Tissue Engineering.

Related Links:
Massachusetts Institute of Technology
Center for Laryngeal Surgery and Voice Rehabilitation at Massachusetts General Hospital
Ben Gurion University



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89 (118.01719665527): 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 (555.99212646484): SELECT show_live FROM jos_com_show_setting LIMIT 1
91 (44.822692871094): SELECT show_live FROM jos_com_show_setting LIMIT 1
92 (31.948089599609): SELECT show_live FROM jos_com_show_setting LIMIT 1
93 (30.994415283203): SELECT show_live FROM jos_com_show_setting LIMIT 1
94 (144.95849609375): SELECT show_live FROM jos_com_show_setting LIMIT 1
95 (559.80682373047): SELECT show_live FROM jos_com_show_setting LIMIT 1
96 (52.213668823242): SELECT show_live FROM jos_com_show_setting LIMIT 1
97 (38.862228393555): SELECT show_live FROM jos_com_show_setting LIMIT 1
98 (50.067901611328): SELECT show_live FROM jos_com_show_setting LIMIT 1
99 (66.995620727539): SELECT show_live FROM jos_com_show_setting LIMIT 1
100 (38.862228393555): SELECT show_live FROM jos_com_show_setting LIMIT 1
101 (36.954879760742): SELECT show_live FROM jos_com_show_setting LIMIT 1
102 (181.19812011719): SELECT show_live FROM jos_com_show_setting LIMIT 1
103 (44.107437133789): SELECT show_live FROM jos_com_show_setting LIMIT 1
104 (998.97384643555): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294730025 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294730025 AND published='1' LIMIT 1
105 (90.837478637695): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294730025 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294730025 AND published='1' LIMIT 1
106 (!!!!! 1123.9051818848): 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=294730025 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
107 (!!!!! 3720.9987640381): 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=294730025 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
108 (516.89147949219): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294730025 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294730025 AND published='1' LIMIT 1
109 (!!!!! 2856.0161590576): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294730025 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294730025 AND published='1' LIMIT 1
110 (404.11949157715): 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=294730025 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
111 (!!!!! 1154.899597168): 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=294730025 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
112 (828.98139953613): 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 (612.97416687012): 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 (198.8410949707): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294730025 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294730025 AND published='1' LIMIT 1
115 (81.062316894531): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294730025 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294730025 AND published='1' LIMIT 1
116 (87.976455688477): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294730025 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294730025 AND published='1' LIMIT 1
117 (61.988830566406): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294730025 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294730025 AND published='1' LIMIT 1
118 (73.909759521484): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294730025 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294730025 AND published='1' LIMIT 1
119 (66.041946411133): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294730025 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294730025 AND published='1' LIMIT 1
120 (77.962875366211): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294730025 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294730025 AND published='1' LIMIT 1
121 (55.074691772461): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294730025 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294730025 AND published='1' LIMIT 1
122 (323.05717468262): SELECT * FROM trending_articles WHERE `journal_id` = 10 AND `timestamp` <= NOW() + INTERVAL 7 DAY ORDER BY `order`
123 (!!!!! 113383.05473328): 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 (!!!!! 9892.9405212402): SELECT fid FROM jos_deeppockets WHERE cat=10 AND id=294730025 AND type='deeppockets_item' AND published='1' union SELECT fid FROM jos_deeppockets_archive WHERE cat=10 AND id=294730025 AND type='deeppockets_item' AND published='1' LIMIT 1
125 (!!!!! 47710.89553833): ( 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 (510.93101501465): ( 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 (648.02169799805): 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 (291.10908508301): 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 (282.04917907715): 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 (279.18815612793): 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 (272.98927307129): 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 (422.00088500977): 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 (75.101852416992): 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 (!!!!! 3236.7706298828): 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 (!!!!! 7673.978805542): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294730025 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
136 (!!!!! 3940.8206939697): SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294730025 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
137 (!!!!! 2427.1011352539): SELECT name FROM jos_deeppockets WHERE id=214
138 (247.00164794922): SELECT name FROM jos_deeppockets WHERE id=214
139 (935.07766723633): 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((;)|($))' AND catid IN (0,110) ORDER BY publish_up ASC LIMIT 3
140 (!!!!! 2692.9378509521): SELECT *, DATE_FORMAT(publish_up,'%d %b %Y') AS date_publish_up, DATE_FORMAT(publish_down,'%d %b %Y') AS date_publish_down FROM jos_events WHERE state=1 AND publish_up > NOW() and extra_info REGEXP '((;)|(^))214((;)|($))' AND catid IN (0,110) ORDER BY publish_up ASC LIMIT 3
141 (!!!!! 1147.985458374): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294730025 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294730025 AND published='1' LIMIT 1
142 (!!!!! 4091.0243988037): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294730025 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294730025 AND published='1' LIMIT 1
143 (!!!!! 14908.075332642): TRUNCATE TABLE jos_trademed_module
144 (!!!!! 3028.1543731689): 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=294730025 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
145 (460.14785766602): 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=294730025 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
146 (751.97219848633): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294730025 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
147 (251.05476379395): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294730025 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
148 (667.09518432617): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294730025 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294730025 AND published='1' LIMIT 1
149 (737.90550231934): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294730025 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294730025 AND published='1' LIMIT 1
150 (!!!!! 2964.0197753906): 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 (!!!!! 1087.1887207031): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294730025 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294730025 AND published='1' LIMIT 1
152 (!!!!! 1929.0447235107): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294730025 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294730025 AND published='1' LIMIT 1
153 (359.05838012695): SELECT fid FROM jos_deeppockets WHERE cat=10 AND id=294730025 AND type='deeppockets_item' AND published='1' union SELECT fid FROM jos_deeppockets_archive WHERE cat=10 AND id=294730025 AND type='deeppockets_item' AND published='1' LIMIT 1
154 (!!!!! 1923.0842590332): 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 (!!!!! 1770.01953125): 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)
156 (915.0505065918): SELECT livesite FROM jos_dp_categories WHERE id=10 AND published='1' LIMIT 1
157 (!!!!! 2389.9078369141): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294730025 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294730025 AND published='1' LIMIT 1
158 (82.969665527344): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294730025 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294730025 AND published='1' LIMIT 1
159 (535.96496582031): select jos_twitters.link from jos_twitters where cat=10
160 (339.03121948242): select jos_facebook.link from jos_facebook where cat=10
161 (79.870223999023): select jos_google_plus.link from jos_google_plus where cat=10
162 (44.107437133789): select jos_linkedin.link from jos_linkedin where cat=10