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Low-intensity pulsed ultrasound stimulation facilitates in vitro osteogenic differentiation of human adipose-derived stem cells via up-regulation of heat shock protein (HSP)70, HSP90, and bone morphogenetic protein (BMP) signaling pathway. Biosci Rep 2018; 38:BSR20180087. [PMID: 29789443 PMCID: PMC6048203 DOI: 10.1042/bsr20180087] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2018] [Revised: 03/28/2018] [Accepted: 04/10/2018] [Indexed: 02/01/2023] Open
Abstract
Low-intensity pulsed ultrasound (LIPUS) has positive effects on osteogenic differentiation. However, the effect of LIPUS on osteogenic differentiation of human adipose-derived stem cells (hASCs) is unclear. In the present study, we investigated whether LIPUS could promote the proliferation and osteogenic differentiation of hASCs. hASCs were isolated and osteogenically induced with LIPUS stimulation at 20 and 30 mW cm-2 for 30 min day-1 Cell proliferation and osteogenic differentiation potential of hASCs were respectively analyzed by cell counting kit-8 assay, Alizarin Red S staining, real-time polymerase chain reaction, and Western blotting. The results indicated that LIPUS stimulation did not significantly affect the proliferation of hASCs, but significantly increased their alkaline phosphatase activity on day 6 of culture and markedly promoted the formation of mineralized nodules on day 21 of culture. The mRNA expression levels of runt-related transcription factor, osteopontin, and osteocalcin were significantly up-regulated by LIPUS stimulation. LIPUS stimulation did not affect the expression of heat shock protein (HSP) 27, HSP40, bone morphogenetic protein (BMP)-6 and BMP-9, but significantly up-regulated the protein levels of HSP70, HSP90, BMP-2, and BMP-7 in the hASCs. Further studies found that LIPUS increased the mRNA levels of Smad 1 and Smad 5, elevated the phosphorylation of Smad 1/5, and suppressed the expression of BMP antagonist Noggin. These findings indicated that LIPUS stimulation enhanced osteogenic differentiation of hASCs possibly through the up-regulation of HSP70 and HSP90 expression and activation of BMP signaling pathway. Therefore, LIPUS might have the potential to promote the repair of bone defect.
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Jiang Y, Wang H, Deng M, Wang Z, Zhang J, Wang H, Zhang H. Effect of ultrasonication on the fibril-formation and gel properties of collagen from grass carp skin. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2016; 59:1038-1046. [DOI: 10.1016/j.msec.2015.11.007] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/23/2015] [Revised: 09/25/2015] [Accepted: 11/03/2015] [Indexed: 01/14/2023]
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Smith BW, Simpson DG, Miller RJ, Erdman JW, O'Brien WD. Contrast Ultrasound Imaging Does Not Affect Heat Shock Protein 70 Expression in Cholesterol-Fed Rabbit Aorta. JOURNAL OF ULTRASOUND IN MEDICINE : OFFICIAL JOURNAL OF THE AMERICAN INSTITUTE OF ULTRASOUND IN MEDICINE 2015; 34:1209-1216. [PMID: 26112623 PMCID: PMC4494680 DOI: 10.7863/ultra.34.7.1209] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
OBJECTIVES Diagnostic ultrasound imaging is enhanced by the use of circulating microbubble contrast agents (UCAs), but the interactions between ultrasound, UCAs, and vascular tissue are not fully understood. We hypothesized that ultrasound with a UCA would stress the vascular tissue and increase levels of heat shock protein 70 (Hsp70), a cellular stress protein. METHODS Male New Zealand White rabbits (n = 32) were fed a standard chow diet (n = 4) or a 1% cholesterol, 10% fat, and 0.11% magnesium diet (n = 28). At 21 days, 24 rabbits on the cholesterol diet were either exposed to ultrasound (3.2-MHz f/3 transducer; 2.1 MPa; mechanical index, 1.17; 10 Hz pulse repetition frequency; 1.6 microseconds pulse duration; 2 minutes exposure duration at 4 sites along the aorta) with the UCA Definity (1× concentration, 1 mL/min; Lantheus Medical Imaging, North Billerica, MA) or sham exposed with a saline vehicle injection (n = 12 per group). Four rabbits on the cholesterol diet and 4 on the chow diet served as cage controls and were not exposed to ultrasound or restrained for blood sample collection. Animals were euthanized 24 hours after exposure, and aortas were quickly isolated and frozen in liquid nitrogen. Aorta lysates from the area of ultrasound exposure were analyzed for Hsp70 level by Western blot. Blood plasma was analyzed for cholesterol, Hsp70, and von Willebrand factor, a marker of endothelial function. RESULTS Plasma total cholesterol levels increased to an average of 705 mg/dL. Ultrasound did not affect plasma von Willebrand factor, plasma Hsp70, or aorta Hsp70. Restraint increased Hsp70 (P < .001, analysis of variance). CONCLUSIONS Restraint, but not ultrasound with the UCA or cholesterol feeding, significantly increased Hsp70.
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Affiliation(s)
- Brendon W Smith
- Bioacoustics Research Laboratory, Department of Electrical and Computer Engineering (B.W.S., R.J.M., W.D.O.), Division of Nutritional Sciences (B.W.S., J.W.E., W.D.O.), and Departments of Statistics (D.G.S.) and Food Science and Human Nutrition (J.W.E.), University of Illinois at Urbana-Champaign, Urbana, Illinois USA
| | - Douglas G Simpson
- Bioacoustics Research Laboratory, Department of Electrical and Computer Engineering (B.W.S., R.J.M., W.D.O.), Division of Nutritional Sciences (B.W.S., J.W.E., W.D.O.), and Departments of Statistics (D.G.S.) and Food Science and Human Nutrition (J.W.E.), University of Illinois at Urbana-Champaign, Urbana, Illinois USA
| | - Rita J Miller
- Bioacoustics Research Laboratory, Department of Electrical and Computer Engineering (B.W.S., R.J.M., W.D.O.), Division of Nutritional Sciences (B.W.S., J.W.E., W.D.O.), and Departments of Statistics (D.G.S.) and Food Science and Human Nutrition (J.W.E.), University of Illinois at Urbana-Champaign, Urbana, Illinois USA
| | - John W Erdman
- Bioacoustics Research Laboratory, Department of Electrical and Computer Engineering (B.W.S., R.J.M., W.D.O.), Division of Nutritional Sciences (B.W.S., J.W.E., W.D.O.), and Departments of Statistics (D.G.S.) and Food Science and Human Nutrition (J.W.E.), University of Illinois at Urbana-Champaign, Urbana, Illinois USA
| | - William D O'Brien
- Bioacoustics Research Laboratory, Department of Electrical and Computer Engineering (B.W.S., R.J.M., W.D.O.), Division of Nutritional Sciences (B.W.S., J.W.E., W.D.O.), and Departments of Statistics (D.G.S.) and Food Science and Human Nutrition (J.W.E.), University of Illinois at Urbana-Champaign, Urbana, Illinois USA.
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Vardiman JP, Moodie N, Siedlik JA, Kudrna RA, Graham Z, Gallagher P. Short-Wave Diathermy Pretreatment and Inflammatory Myokine Response After High-Intensity Eccentric Exercise. J Athl Train 2015; 50:612-20. [PMID: 25844857 DOI: 10.4085/1062-6050-50.1.12] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
CONTEXT Various modalities have been used to pretreat skeletal muscle to attenuate inflammation. OBJECTIVE To determine the effects of short-wave diathermy (SWD) preheating treatment on inflammation and stress markers after eccentric exercise. DESIGN Controlled laboratory study. SETTING University laboratory setting. PATIENTS OR OTHER PARTICIPANTS Fifteen male (age = 22 ± 4.9 years, height = 179.75 ± 9.56 cm, mass = 82.22 ± 12.67 kg) college-aged students. INTERVENTION(S) Seven participants were selected randomly to receive 40 minutes of SWD heat treatment (HT), and 8 participants served as the control (CON) group and rested without SWD. Both groups completed 7 sets of 10 repetitions of a high-intensity eccentric exercise protocol (EEP) at 120% of the 1-repetition maximum (1-RM) leg extension. MAIN OUTCOME MEASURE(S) We biopsied muscles on days 1, 3 (24 hours post-EEP), and 4 (48 hours post-EEP) and collected blood samples on days 1, 2 (4 hours post-EEP), 3, and 4. We determined 1-RM on day 2 (24 hours post-SWD) and measured 1-RM on days 3 and 4. We analyzed the muscle samples for interleukin 6 (IL-6), tumor necrosis factor α, and heat shock protein 70 and the blood for serum creatine kinase. RESULTS We found a group × time interaction for intramuscular IL-6 levels after SWD (F2,26 = 7.13, P = .003). The IL-6 decreased in HT (F1,6 = 17.8, P = .006), whereas CON showed no change (P > .05). We found a group × time interaction for tumor necrosis factor α levels (F2,26 = 3.71, P = .04), which increased in CON (F2,14 = 7.16, P = .007), but saw no changes for HT (P > .05). No group × time interactions were noted for 1-RM, heat shock protein 70, or creatine kinase (P > .05). CONCLUSIONS The SWD preheating treatment provided a treatment effect for intramuscular inflammatory myokines induced through high-intensity eccentric exercise but did not affect other factors associated with intense exercise and inflammation.
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Affiliation(s)
- John P Vardiman
- Applied Physiology Laboratory, University of Kansas, Lawrence
| | - Nicole Moodie
- Exercise and Sport Science Department, Rockhurst University, Kansas City, MO
| | - Jacob A Siedlik
- Applied Physiology Laboratory, University of Kansas, Lawrence
| | | | - Zachary Graham
- Applied Physiology Laboratory, University of Kansas, Lawrence
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Matsumoto Y, Nakano J, Oga S, Kataoka H, Honda Y, Sakamoto J, Okita M. The non-thermal effects of pulsed ultrasound irradiation on the development of disuse muscle atrophy in rat gastrocnemius muscle. ULTRASOUND IN MEDICINE & BIOLOGY 2014; 40:1578-1586. [PMID: 24613643 DOI: 10.1016/j.ultrasmedbio.2013.12.031] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/11/2013] [Revised: 12/10/2013] [Accepted: 12/31/2013] [Indexed: 06/03/2023]
Abstract
This study examined the effects of therapeutic pulsed ultrasound (US) on the development of disuse muscle atrophy in rat gastrocnemius muscle. Male Wistar rats were randomly distributed into control, immobilization (Im), sham US, and US groups. In the Im, sham US and US groups, the bilateral ankle joints of each rat were immobilized in full plantar flexion with a plaster cast for a 4-wk period. The pulsed US (frequency, 1 MHz; intensity, 1.0 W/cm(2); pulsed mode 1:4; 15 min) was irradiated to the gastrocnemius muscle in the US group over a 4-wk immobilization period. The pulsed US irradiation delivered only non-thermal effects to the muscle. In conjunction with US irradiation, 5-bromo-2'-deoxyuridine (BrdU) was injected subcutaneously to label the nuclei of proliferating satellite cells 1 h before each pulsed US irradiation. Immobilization resulted in significant decreases in the mean diameters of type I, IIA and IIB muscle fibers of the gastrocnemius muscle in the Im, sham US and US groups compared with the control group. However, the degrees of muscle fiber atrophy for all types were significantly lower in the US group compared with the Im and sham US groups. Although the number of capillaries and the concentrations of insulin-like growth factor and basic fibroblast growth factor did not change in the muscle, the number of BrdU-positive nuclei in the muscle was significantly increased by pulsed US irradiation in the US group. The results of this study suggest that pulsed US irradiation inhibits the development of disuse muscle atrophy partly via activation of satellite cells.
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Affiliation(s)
- Yoko Matsumoto
- Department of Rehabilitation, Saiseikai Nagasaki Hospital, Nagasaki, Japan
| | - Jiro Nakano
- Unit of Physical and Occupational Therapy, Nagasaki University Graduate School of Biomedical Sciences, Nagasaki, Japan.
| | - Satoshi Oga
- Department of Rehabilitation, Saiseikai Nagasaki Hospital, Nagasaki, Japan
| | - Hideki Kataoka
- Department of Rehabilitation, Nagasaki Memorial Hospital, Nagasaki, Japan; Department of Locomotive Rehabilitation Science, Unit of Rehabilitation Sciences, Nagasaki University Graduate School of Biomedical Sciences, Nagasaki, Japan
| | - Yuichiro Honda
- Department of Locomotive Rehabilitation Science, Unit of Rehabilitation Sciences, Nagasaki University Graduate School of Biomedical Sciences, Nagasaki, Japan
| | - Junya Sakamoto
- Department of Rehabilitation, Nagasaki University Hospital, Nagasaki, Japan
| | - Minoru Okita
- Department of Locomotive Rehabilitation Science, Unit of Rehabilitation Sciences, Nagasaki University Graduate School of Biomedical Sciences, Nagasaki, Japan
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Vardiman JP, Jefferies L, Touchberry C, Gallagher P. Intramuscular heating through fluidotherapy and heat shock protein response. J Athl Train 2013; 48:353-61. [PMID: 23675795 DOI: 10.4085/1062-6050-48.2.22] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
CONTEXT Therapeutic modalities that can increase intramuscular temperature commonly are used to treat injuries in the clinical setting. Researchers recently have suggested that the physiologic changes occurring during an increase in temperature also could provide a cytoprotective effect for exercise-induced muscle damage. OBJECTIVE(S) To determine if the Fluidotherapy treatment increases the inducible expression of heat shock protein (HSP), to identify the rate of heating that occurs in the lower extremity with Fluidotherapy treatment, and to evaluate the relationship between the inducible expression of HSP and temperature. DESIGN Controlled laboratory study. SETTING Laboratory. PATIENTS OR OTHER PARTICIPANTS Six male (age = 21.67 ± 1.63 years, height = 180.09 ± 4.83 cm, mass = 87.60 ± 10.51 kg) and 6 female (age = 24.60 ± 4.59 years, height = 151.05 ± 35.76 cm, mass = 55.59 ± 14.58 kg) college-aged students. INTERVENTION(S) One lower extremity was randomly selected to receive the heat treatment, and the other extremity received no treatment. MAIN OUTCOME MEASURE(S) We measured intramuscular temperature every 10 minutes, determining peak intramuscular temperature by 2 identical sequential measurements, and we analyzed the time to peak temperature. We analyzed the amount of HSP70 expression and HSP27P:T (ratio of HSP27 to the total HSP27 expression) in the gastrocnemius and soleus muscles and measured baseline skinfold thickness and estradiol levels. RESULTS Fluidotherapy increased intramuscular temperature by 5.66 ± 0.78°C (t11 = 25.67, P < .001) compared with baseline temperature, with a peak temperature of 39.08°C ± 0.39°C occurring at 84.17 ± 6.69 minutes. We did not find a heat treatment effect for HSP70 or HSP27P:T in the gastrocnemius or soleus muscles (P > .05). Peak temperature and the percentage change of HSP70 were positively correlated for the gastrocnemius and soleus muscles (P < .05). We found no other correlations for skinfold thickness, sex, or estradiol levels (P > .05). No effect of sex for skinfold thickness or estradiol levels at baseline was discovered (P > .05). CONCLUSIONS This Fluidotherapy protocol increased the intramuscular temperature to a therapeutic level; however, it did not stimulate inducible HSP70 or HSP27P:T in the soleus and gastrocnemius muscles regardless of sex or skinfold thickness. These data confirmed that Fluidotherapy is an effective heating modality but suggested it is not an effective method for stimulating an HSP response in the lower limb.
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Affiliation(s)
- John P Vardiman
- Applied Physiology Lab, University of Kansas, Lawrence, KS 66045, USA.
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Sakamoto J, Nakano J, Kataoka H, Origuchi T, Yoshimura T, Okita M. Continuous Therapeutic Ultrasound Inhibits Progression of Disuse Atrophy in Rat Gastrocnemius Muscles. J Phys Ther Sci 2012. [DOI: 10.1589/jpts.24.443] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
Affiliation(s)
- Junya Sakamoto
- Department of Rehabilitation, Nagasaki University Hospital
| | - Jiro Nakano
- Department of Physical Therapy, Unit of Physical and Occupational Therapy, Nagasaki University Graduate School of Biomedical Sciences
| | - Hideki Kataoka
- Department of Rehabilitation, Nagasaki Memorial Hospital
- Department of Locomotive Rehabilitation Science, Unit of Rehabilitation Sciences, Nagasaki University Graduate School of Biomedical Sciences
| | - Tomoki Origuchi
- Department of Locomotive Rehabilitation Science, Unit of Rehabilitation Sciences, Nagasaki University Graduate School of Biomedical Sciences
| | - Toshiro Yoshimura
- Department of Locomotive Rehabilitation Science, Unit of Rehabilitation Sciences, Nagasaki University Graduate School of Biomedical Sciences
| | - Minoru Okita
- Department of Locomotive Rehabilitation Science, Unit of Rehabilitation Sciences, Nagasaki University Graduate School of Biomedical Sciences
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Kruglikov IL, Sontag W. Ultrasound of 10 MHz frequency as a novel strategy for skin anti-aging therapy. Med Hypotheses 2009; 74:620-1. [PMID: 19942353 DOI: 10.1016/j.mehy.2009.10.048] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2009] [Accepted: 10/31/2009] [Indexed: 10/20/2022]
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Sontag W, Kruglikov IL. Expression of heat shock proteins after ultrasound exposure in HL-60 cells. ULTRASOUND IN MEDICINE & BIOLOGY 2009; 35:1032-1041. [PMID: 19285782 DOI: 10.1016/j.ultrasmedbio.2008.12.011] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/10/2008] [Revised: 12/15/2008] [Accepted: 12/16/2008] [Indexed: 05/27/2023]
Abstract
One of the important cellular defense mechanisms against stress is the induction of heat shock proteins (HSPs). We have recently demonstrated that a low frequency electromagnetic field is unable to induce the heat shock response (HSR). In the present study, we expanded our investigations to the induction of HSPs, particularly Hsp72, by ultrasound (US). Human promyelocytic leukemia HL-60 cells were exposed in suspension to US at 1, 3 and 10 MHz, as well as combinations of two of these frequencies. The ability of US to induce Hsp72 was tested for different frequencies, intensities and exposure times. In addition, the water bath temperature was varied from 30 to 36 degrees C. The Hsp72 protein expression was determined 4 and 24 h after treatment. We found that the amount of Hsp72 increased with increasing US frequency, reaching its highest level of about 1800%, induced by 10 MHz. After increasing the temperature of the water bath, the amount of Hsp72 in the treated cells was also increased, whereas no induction was observed at 30 degrees C. For all treatment conditions, ultrasound of 1 MHz was unable to significantly induce Hsp72. At 10 MHz, the exposure time was varied from 0 to 20 min. We found that the induction of Hsp72 took place after 5 min of exposure. For a fixed level of absorbed US energy, the continuous regime, as well as a pulsation of 1:2 (5 ms on and 5 ms off) induced the same Hsp72 level. Pulsation of 1:5 (2 ms on and 8 ms off) and 1:10 (1 ms on and 9 ms off) did not show any effect. A single sonication of 20 min, as well as a fractionated sonication of two 10 min exposures induced the same level of Hsp72, whereas four exposures of 5 min reduced the Hsp72 level. At the optimum exposure conditions (10 MHz, 10 min), the concentration of other HSPs was also determined. Hsp27 showed no effect but Hsp32, Hsp40 and Hsp72 were induced. Taken together, these results suggest a synergistic interaction between heat and US.
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Affiliation(s)
- Werner Sontag
- Institut für Biologische Grenzflächen, Forschungszentrum Karlsruhe, Karlsruhe, Germany.
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Okita M, Nakano J, Kataoka H, Sakamoto J, Origuchi T, Yoshimura T. Effects of therapeutic ultrasound on joint mobility and collagen fibril arrangement in the endomysium of immobilized rat soleus muscle. ULTRASOUND IN MEDICINE & BIOLOGY 2009; 35:237-244. [PMID: 19010586 DOI: 10.1016/j.ultrasmedbio.2008.09.001] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/10/2008] [Revised: 06/21/2008] [Accepted: 09/01/2008] [Indexed: 05/27/2023]
Abstract
This study examined effects of therapeutic ultrasound on joint mobility and collagen fibril arrangement in the endomysium of immobilized rat soleus muscle. Twenty-two male Wistar rats were divided randomly into control (n = 5) and experimental groups (n = 17). In the experimental group, bilateral ankle joints of each rat were fixed in full plantar flexion with a plaster cast over a 4-wk period. Five animals in the experimental group were immobilized throughout the 4-wk (immobilization group) period, whereas the remaining rats in the experimental group were randomly divided into the ultrasound (US, n = 6) and sham (n = 6) treatment groups. Under anesthesia, continuous ultrasonic energy (frequency, 1 MHz; intensity, 1.0 W/cm(2)) was delivered to the triceps surae muscle of the US group for 15 min per d, 6 d per wk over the 4-wk immobilization period. Ultrasonic energy was not delivered to the triceps surae muscle in sham animals; only the transducer head was moved. Ankle joint mobility on dorsiflexion in the immobilization, sham and US groups was significantly smaller than that of the control group, whereas in the US group, this parameter was significantly greater than in the immobilization and sham groups. Collagen fibril arrangement in the endomysium of the control and US groups was longitudinal to the axis of the muscle fibers; in contrast, it was circumferential in the immobilization and sham groups. Our findings revealed that joint immobilization induces decreased joint mobility and collagen fibril movement in the endomysium; furthermore, ultrasound treatment can prevent these changes. We hypothesized that therapeutic ultrasound during the immobilization process may inhibit deterioration of muscle contracture.
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Affiliation(s)
- Minoru Okita
- Unit of Physical and Occupational Therapy, Nagasaki University Graduate School of Biomedical Sciences, Sakamoto Nagasaki, Japan.
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Nussbaum EL, Locke M. Heat Shock Protein Expression in Rat Skeletal Muscle After Repeated Applications of Pulsed and Continuous Ultrasound. Arch Phys Med Rehabil 2007; 88:785-90. [PMID: 17532903 DOI: 10.1016/j.apmr.2007.03.020] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
OBJECTIVE To determine whether repeated ultrasound treatments are capable of increasing the expression of heat shock protein (HSP) 72 and HSP 25 in rat skeletal muscles. DESIGN In vivo, experimental, controlled study. SETTING Animal laboratory. ANIMALS Male Sprague-Dawley rats (n=9). INTERVENTIONS Ultrasound (1MHz, 15 min, 2.0 cm2 transducer) continuous at 1.0 W/cm2 spatial average temporal average intensity (CONTUS) or pulsed at 2.0 W/cm2 spatial average temporal peak intensity 50% duty cycle (PULS50) was applied on 4 consecutive days to the lower leg muscles of 1 hindlimb in each rat (n=9). MAIN OUTCOME MEASURES Twenty-four hours after the final ultrasound application, hindlimb muscles were removed, weighed, and assessed for HSP 72 and HSP 25 content by Western blotting. Bands from blots were quantified and data were assessed using t tests (alpha=.05). RESULTS Ultrasound did not affect core or contralateral hindlimb muscle temperature. Average muscle temperatures during the final day ultrasound treatments were 38.71 degrees +/-0.30 degrees C when using PULS50 and 38.16 degrees +/-0.57 degrees C when using CONTUS. PULS50 significantly increased HSP 25 content in the plantaris and soleus muscles and HSP 72 content in the plantaris muscles. CONTUS significantly increased HSP 72 content in the white gastrocnemius muscle. CONCLUSIONS HSPs can be induced in skeletal muscle when ultrasound is used on a repeated basis to treat soft tissue.
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Affiliation(s)
- Ethne L Nussbaum
- Department of Physical Therapy, Mount Sinai Hospital and Faculty of Medicine, University of Toronto, Toronto, ON, Canada.
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Liu Y, Kon T, Li C, Zhong P. High intensity focused ultrasound-induced gene activation in sublethally injured tumor cells in vitro. THE JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA 2005; 118:3328-36. [PMID: 16334906 PMCID: PMC1948881 DOI: 10.1121/1.2041247] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/04/2023]
Abstract
Cultured human cervical cancer (HeLa) and rat mammary carcinoma (R3230Ac) cells were transfected with vectors encoding green fluorescent protein (GFP) under the control of hsp70B promoter. Aliquots of 10-microl transfected cells (5 x 10(7) cells/ml) were placed in 0.2-ml thin-wall polymerase chain reaction tubes and exposed to 1.1-MHz high intensity focused ultrasound (HIFU) at a peak negative pressure P- = 2.68 MPa. By adjusting the duty cycle of the HIFU transducer, the cell suspensions were heated to a peak temperature from 50 to 70 degrees C in 1-10 s. Exposure dependent cell viability and gene activation were evaluated. For a 5-s HIFU exposure, cell viability dropped from 95% at 50 degrees C to 13% at 70 degrees C. Concomitantly, gene activation in sublethally injured tumor cells increased from 4% at 50 degrees C to 41% at 70 degrees C. A similar trend was observed at 60 degrees C peak temperature as the exposure time increased from 1 to 5 s. Further increase of exposure duration to 10 s led to significantly reduced cell viability and lower overall gene activation in exposed cells. Altogether, maximum HIFU-induced gene activation was achieved at 60 degrees C in 5 s. Under these experimental conditions, HIFU-induced gene activation was found to be produced primarily by thermal rather than mechanical stresses.
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Affiliation(s)
- Yunbo Liu
- Department of Mechanical Engineering and Materials Science, Duke University, Durham, North Carolina 27708
| | - Takashi Kon
- Department of Radiation Oncology, Duke University Medical Center, Durham, North Carolina 27708
| | - Chuanyuan Li
- Department of Radiation Oncology, Duke University Medical Center, Durham, North Carolina 27708
| | - Pei Zhong
- Author to whom correspondence should be addressed; electronic mail:
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