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Totten AH, Xiao L, Crabb DM, Ratliff AE, Dybvig K, Waites KB, Atkinson TP. Shaken or stirred?: Comparison of methods for dispersion of Mycoplasma pneumoniae aggregates for persistence in vivo. J Microbiol Methods 2017; 132:56-62. [DOI: 10.1016/j.mimet.2016.11.011] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2016] [Revised: 11/14/2016] [Accepted: 11/15/2016] [Indexed: 11/24/2022]
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Peng H, Xu Z, Chen S, Zhang Z, Li B, Ge L. An easily assembled double T-shape microfluidic devices for the preparation of submillimeter-sized polyacronitrile (PAN) microbubbles and polystyrene (PS) double emulsions. Colloids Surf A Physicochem Eng Asp 2015. [DOI: 10.1016/j.colsurfa.2014.12.016] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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Teng Z, Cao S, Li W, Yang L, Shi W, Wang Y, Wu J, Bin J. A micrometer-sized ultrasound contrast agent with nanometer-scale polygonal patterning surfaces. J Med Ultrason (2001) 2014; 41:421-9. [PMID: 27278022 DOI: 10.1007/s10396-014-0543-y] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2013] [Accepted: 03/13/2014] [Indexed: 10/25/2022]
Abstract
PURPOSE To develop a smaller micro-sized bubble ultrasound contrast agent which composed of an insoluble, less-dense, self-assembled surfactant with a condensed crystallized nanometer-scale polygonal patterning surface. METHODS The microbubble was prepared by high-shear mixing a mixture of sucrose esters, glucose sugar, and water. The coulter counter was used to measure the size and concentration of the microbubble. Surface patterns of the microbubble were determined using vitrified samples under cryo-transmission electron microscopy. Myocardial contrast effects of six normal dog's myocardium were assessed. RESULTS The diameter of the developed microbubble was smaller than Sonovue(®). Direct imaging of cryo-transmission electron microscopy revealed that the developed microbubble has a nanometer-scale polygonal surface pattern. Both the developed microbubble and Sonovue(®) effectively enhanced the myocardial contrast. The difference in the peak video intensity, the longevity of the contrast effect, and time-to-peak interval between both microbubbles were not statistically significant (NS). CONCLUSION The microbubble with nanometer-scale polygonal patterning surfaces is a feasible and promising contrast agent for the ultrasound imaging.
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Affiliation(s)
- Zhonghua Teng
- Department of Cardiology, Nanfang Hospital, Southern Medical University, 1838 North Guangzhou Avenue, Guangzhou, 510515, China
| | - Shiping Cao
- Department of Cardiology, Nanfang Hospital, Southern Medical University, 1838 North Guangzhou Avenue, Guangzhou, 510515, China
| | - Wei Li
- Department of Plastic Surgery, Nanfang Hospital, Southern Medical University, Guangzhou, 510515, China
| | - Li Yang
- Department of Pharmacology, Nanfang Hospital, Southern Medical University, Guangzhou, 510515, China
| | - Wen Shi
- Department of Pharmaceutical Sciences, College of Pharmacy, University of Nebraska Medical Center, Omaha, NE, 68131, USA
| | - Yuegang Wang
- Department of Cardiology, Nanfang Hospital, Southern Medical University, 1838 North Guangzhou Avenue, Guangzhou, 510515, China
| | - Juefei Wu
- Department of Cardiology, Nanfang Hospital, Southern Medical University, 1838 North Guangzhou Avenue, Guangzhou, 510515, China.
| | - Jianping Bin
- Department of Cardiology, Nanfang Hospital, Southern Medical University, 1838 North Guangzhou Avenue, Guangzhou, 510515, China
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Bishop CV, Molskness TA, Xu F, Belcik JT, Lindner JR, Slayden OD, Stouffer RL. Quantification of dynamic changes to blood volume and vascular flow in the primate corpus luteum during the menstrual cycle. J Med Primatol 2014; 43:445-54. [PMID: 24948037 DOI: 10.1111/jmp.12132] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 05/20/2014] [Indexed: 01/28/2023]
Abstract
BACKGROUND The objective of the current study was to determine changes to vascular parameters of nonhuman primate dominant ovarian structures by dynamic contrast-enhanced ultrasound (DCE-US). MATERIALS AND METHODS Dynamic contrast-enhanced ultrasound with intravenous microbubble infusion was performed on the rhesus macaque ovary bearing the pre-ovulatory follicle and corpus luteum (CL) sequentially during the natural luteal phase (n = 8) and GnRH antagonist (antide)-induced luteal regression (n = 6). RESULTS Changes in luteal blood volume (BV) and vascular flow (VF) were observed between stages of the luteal phase Luteal BV was highest in early stage CL, before decreasing 2.5-fold in late stage CL (P < 0.06); in contrast, luteal VF peaked at mid luteal stage (P < 0.01). Two females identified with luteal insufficiency trended toward lower peak BV, compared to typical CLs. Another female was identified with a luteal cyst on the contralateral ovary, and a CL that regressed before P levels declined. After 72 hours of antide exposure, BV was reduced 2.3-fold (P = 0.03). CONCLUSIONS DCE-US provides a sensitive, non-invasive measurement of the dynamics of blood volume and flow in dominant ovarian structures.
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Affiliation(s)
- Cecily V Bishop
- Division of Reproductive & Developmental Sciences, Oregon National Primate Research Center, Beaverton, OR, USA
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Bioinformatics and Nanotechnologies: Nanomedicine. SPRINGER HANDBOOK OF BIO-/NEUROINFORMATICS 2014. [PMCID: PMC7124100 DOI: 10.1007/978-3-642-30574-0_32] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
In this chapter we focus on the bioinformatics strategies for translating genome-wide expression analyses into clinically useful cancer markers
with a specific focus on breast cancer
with a perspective on new diagnostic device tools coming from the field of nanobiotechnology and the challenges related to high-throughput data integration, analysis, and assessment from multiple sources. Great progress in the development of molecular biology techniques has been seen since the discovery of the structure of deoxyribonucleic acid (DNA) and the implementation of a polymerase chain reaction (PCR) method. This started a new era of research on the structure of nucleic acids molecules, the development of new analytical tools, and DNA-based analyses that allowed the sequencing of the human genome, the completion of which has led to intensified efforts toward comprehensive analysis of mammalian cell struc ture and metabolism in order to better understand the mechanisms that regulate normal cell behavior and identify the gene alterations responsible for a broad spectrum of human diseases, such as cancer, diabetes, cardiovascular diseases, neurodegenerative disorders, and others.
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Matosziuk LM, Leibowitz JH, Heffern MC, MacRenaris KW, Ratner MA, Meade TJ. Structural optimization of Zn(II)-activated magnetic resonance imaging probes. Inorg Chem 2013; 52:12250-61. [PMID: 23777423 PMCID: PMC3805786 DOI: 10.1021/ic400681j] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
We report the structural optimization and mechanistic investigation of a series of bioactivated magnetic resonance imaging contrast agents that transform from low relaxivity to high relaxivity in the presence of Zn(II). The change in relaxivity results from a structural transformation of the complex that alters the coordination environment about the Gd(III) center. Here, we have performed a series of systematic modifications to determine the structure that provides the optimal change in relaxivity in response to the presence of Zn(II). Relaxivity measurements in the presence and absence of Zn(II) were used in conjunction with measurements regarding water access (namely, number of water molecules bound) to the Gd(III) center and temperature-dependent (13)C NMR spectroscopy to determine how the coordination environment about the Gd(III) center is affected by the distance between the Zn(II)-binding domain and the Gd(III) chelate, the number of functional groups on the Zn(II)-binding domain, and the presence of Zn(II). The results of this study provide valuable insight into the design principles for future bioactivated magnetic resonance probes.
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Affiliation(s)
- Lauren M. Matosziuk
- Departments of Chemistry, Molecular Biosciences, Neurobiology, Biomedical Engineering, and Radiology, Northwestern University, Evanston, Illinois 60208-3113
| | - Jonathan H. Leibowitz
- Departments of Chemistry, Molecular Biosciences, Neurobiology, Biomedical Engineering, and Radiology, Northwestern University, Evanston, Illinois 60208-3113
| | - Marie C. Heffern
- Departments of Chemistry, Molecular Biosciences, Neurobiology, Biomedical Engineering, and Radiology, Northwestern University, Evanston, Illinois 60208-3113
| | - Keith W. MacRenaris
- Departments of Chemistry, Molecular Biosciences, Neurobiology, Biomedical Engineering, and Radiology, Northwestern University, Evanston, Illinois 60208-3113
| | - Mark A. Ratner
- Department of Chemistry, and Materials Science and Engineering, Northwestern University, Evanston, Illinois 60208-3113
| | - Thomas J. Meade
- Departments of Chemistry, Molecular Biosciences, Neurobiology, Biomedical Engineering, and Radiology, Northwestern University, Evanston, Illinois 60208-3113
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Chen R, Dong PF, Xu JH, Wang YD, Luo GS. Controllable microfluidic production of gas-in-oil-in-water emulsions for hollow microspheres with thin polymer shells. LAB ON A CHIP 2012; 12:3858-3860. [PMID: 22733304 DOI: 10.1039/c2lc40387k] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
Here we developed a simple and novel one-step approach to produce G/O/W emulsions with high gas volume fractions in a capillary microfluidic device. The thickness of the oil layer can be controlled easily by tuning the flow rates. We successfully used the G/O/W emulsions to prepared hollow microspheres with thin polymer shells.
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Affiliation(s)
- Ran Chen
- The State Key Lab of Chemical Engineering, Department of Chemical Engineering, Tsinghua University, Beijing 100084, China
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Insonation frequency selection may assist detection and therapeutic delivery of targeted ultrasound contrast agents. Ther Deliv 2012; 2:213-22. [PMID: 22833947 DOI: 10.4155/tde.10.112] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022] Open
Abstract
BACKGROUND Ultrasound-targeted drug delivery relies on the unique nature of ultrasound contrast agents--they are microbubbles that respond strongly to ultrasound. Intravenously injected microbubbles are smaller than a blood cell. By increasing the ultrasound power, the bubbles can be ruptured at the targeted endothelial wall, locally releasing any molecules in the bubble shell. Furthermore, ultrasound-activated microbubbles are known to cause sonoporation--the process by which ultrasound drives molecules through cellular membranes. However, techniques are required to selectively detect and rupture only those microbubbles on target walls. METHOD Experiments are presented on the behaviour of microbubbles on walls. For accuracy, imaging measurements are made on model microbubbles larger than contrast agents. Bubble size was varied and the resonant frequency peak determined. RESULTS Microbubbles on walls have a shifted frequency in good agreement with theory: a 20-25% downshift from the frequency when far from walls. Effects other than the presence of the wall account for less than 5% of the shift. DISCUSSION Theory predicts the frequency downshift should be sustained for actual contrast-agent sized bubbles. The effect of real, compliant cell walls requires investigation. An appropriate downshift in the applied ultrasound frequency could selectively tune gene or drug delivery. To make this feasible, it may be necessary to manufacture monodispersed microbubbles.
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Wan J, Stone HA. Coated gas bubbles for the continuous synthesis of hollow inorganic particles. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2012; 28:37-41. [PMID: 22129137 DOI: 10.1021/la203824f] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
We present a microfluidic approach for the controlled encapsulation of individual gas bubbles in micrometer-diameter aqueous droplets with high gas volume fractions and demonstrate this approach to making a liquid shell, which serves as a template for the synthesis of hollow inorganic particles. In particular, we find that an increase in the viscosity of the aqueous phase facilitates the encapsulation of individual gas bubbles in an aqueous droplet and allows control of the thickness of a thin aqueous shell. Furthermore, because such droplets contain a finite amount of water, uncontrolled hydrolysis reactions between reactive inorganic precursors and bulk water can be avoided. We demonstrate this approach by introducing reactive inorganic precursors, such as silane and titanium butoxide, for sol-gel reactions downstream from the formation of the bubble in a droplet and consequently fabricate hollow particles of silica or titania in one continuous flow process. These approaches provide a route to controlling double-emulsion-type gas-liquid microstructures and offer a new fabrication method for thin-shell-covered microbubbles and hollow microparticles.
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Affiliation(s)
- Jiandi Wan
- Department of Mechanical and Aerospace Engineering, Princeton University, Princeton, New Jersey 08544, United States.
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Keator CS, Lindner JR, Belcik JT, Bishop CV, Slayden OD. Contrast-enhanced ultrasound reveals real-time spatial changes in vascular perfusion during early implantation in the macaque uterus. Fertil Steril 2011; 95:1316-21.e1-3. [PMID: 21316046 DOI: 10.1016/j.fertnstert.2011.01.040] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2010] [Revised: 01/07/2011] [Accepted: 01/07/2011] [Indexed: 01/27/2023]
Abstract
OBJECTIVE To use contrast-enhanced ultrasound (CEU) to quantify blood flow in the macaque uterus during early pregnancy. DESIGN Prospective nonhuman primate study. SETTING Oregon National Primate Research Center. ANIMALS Naturally cycling female rhesus macaques (Macaca mulatta). INTERVENTION(S) Female macaques were mated on days 11-14 of the cycle. Females were then imaged by CEU and Doppler ultrasound once every 3 days from day 21 through day 39 of the fertile cycle. MAIN OUTCOME MEASURE(S) Visualization and quantification of uterine vascular perfusion. RESULT(S) CEU identified the primary placental disc and underlying vessels approximately 2 days earlier than Doppler ultrasound was able to observe endometrial thickening. CEU revealed spatial differences in vascular perfusion between the endometrium, myometrium, and endometrial-myometrial (junctional) zone. Myometrium displayed the highest rate of blood flow (>10 mL/min/g tissue). There was less blood flow in the endometrium and junctional zone (<3 mL/min/g). A brief fall in progesterone was observed during early implantation, which was correlated with reduced blood flow to all three uterine compartments, but did not reduce flow to the placenta. CONCLUSIONS CEU provides a sensitive, noninvasive method to assess vascular perfusion of the uterus during embryo implantation in macaques. We propose CEU as a new diagnostic tool to monitor vascular changes associated with early pregnancy in women.
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Affiliation(s)
- Christopher S Keator
- Division of Reproductive Sciences, Oregon National Primate Research Center, Oregon Health and Science University, Beaverton, Oregon 97006-3448, USA.
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Zagorchev L, Mulligan-Kehoe MJ. Advances in imaging angiogenesis and inflammation in atherosclerosis. Thromb Haemost 2011; 105:820-7. [PMID: 21331441 DOI: 10.1160/th10-08-0562] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2010] [Accepted: 01/28/2011] [Indexed: 01/07/2023]
Abstract
Advances in imaging technology have provided powerful tools for dissecting the angiogenic and inflammatory aspects of atherosclerosis. Improved technology along with multi-modal approaches has expanded the utilisation of imaging. Recent advances provide the ability to better define structure and development of angiogenic vessels, identify relationships between inflammatory mediators and the vessel wall, validate biological effects of anti-inflammatory and anti-angiogenic drugs, delivery and/or targeting specific molecules to inflammatory regions of atherosclerotic plaques.
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Affiliation(s)
- L Zagorchev
- Thayer School of Engineering, Dartmouth College, Hanover, New Hampshire, USA
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Puri R, Worthley MI, Nicholls SJ. Intravascular imaging of vulnerable coronary plaque: current and future concepts. Nat Rev Cardiol 2011; 8:131-9. [PMID: 21263456 DOI: 10.1038/nrcardio.2010.210] [Citation(s) in RCA: 72] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Advances in coronary imaging are needed to enable the early detection of plaque segments considered to be 'vulnerable' for causing clinical events. Pathological studies have contributed to our current understanding of these vulnerable or unstable segments of plaque. Intravascular ultrasonography (IVUS) has provided insights into the morphology of atherosclerosis, the mediators of plaque progression and the factors associated with acute coronary syndrome (ACS). In addition, the demonstration of pancoronary arterial instability has highlighted that ACS involves a multifocal disease process. Various second-generation intravascular imaging technologies-employing advanced processing of ultrasound radiofrequency backscatter signals, light-based imaging, spectroscopic imaging and molecular targeting-possess inherent advantages for the identification of meaningful surrogates of plaque instability. The fusion of these imaging technologies within a single imaging catheter is likely to allow for greater synergism in image quality and early disease detection. However, natural-history studies to validate the use of these novel imaging tools for enhanced risk prediction are needed before these strategies can be incorporated into mainstream clinical practice.
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Affiliation(s)
- Rishi Puri
- Cardiovascular Research Centre, Department of Medicine, University of Adelaide, North Terrace, SA, Australia
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Sakamoto JH, van de Ven AL, Godin B, Blanco E, Serda RE, Grattoni A, Ziemys A, Bouamrani A, Hu T, Ranganathan SI, De Rosa E, Martinez JO, Smid CA, Buchanan RM, Lee SY, Srinivasan S, Landry M, Meyn A, Tasciotti E, Liu X, Decuzzi P, Ferrari M. Enabling individualized therapy through nanotechnology. Pharmacol Res 2010; 62:57-89. [PMID: 20045055 DOI: 10.1016/j.phrs.2009.12.011] [Citation(s) in RCA: 152] [Impact Index Per Article: 10.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/06/2009] [Accepted: 12/21/2009] [Indexed: 12/13/2022]
Abstract
Individualized medicine is the healthcare strategy that rebukes the idiomatic dogma of 'losing sight of the forest for the trees'. We are entering a new era of healthcare where it is no longer acceptable to develop and market a drug that is effective for only 80% of the patient population. The emergence of "-omic" technologies (e.g. genomics, transcriptomics, proteomics, metabolomics) and advances in systems biology are magnifying the deficiencies of standardized therapy, which often provide little treatment latitude for accommodating patient physiologic idiosyncrasies. A personalized approach to medicine is not a novel concept. Ever since the scientific community began unraveling the mysteries of the genome, the promise of discarding generic treatment regimens in favor of patient-specific therapies became more feasible and realistic. One of the major scientific impediments of this movement towards personalized medicine has been the need for technological enablement. Nanotechnology is projected to play a critical role in patient-specific therapy; however, this transition will depend heavily upon the evolutionary development of a systems biology approach to clinical medicine based upon "-omic" technology analysis and integration. This manuscript provides a forward looking assessment of the promise of nanomedicine as it pertains to individualized medicine and establishes a technology "snapshot" of the current state of nano-based products over a vast array of clinical indications and range of patient specificity. Other issues such as market driven hurdles and regulatory compliance reform are anticipated to "self-correct" in accordance to scientific advancement and healthcare demand. These peripheral, non-scientific concerns are not addressed at length in this manuscript; however they do exist, and their impact to the paradigm shifting healthcare transformation towards individualized medicine will be critical for its success.
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Affiliation(s)
- Jason H Sakamoto
- The University of Texas Health Science Center, Department of Nanomedicine and Biomedical Engineering, Houston, TX 77030, USA
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