Author: Geert W. Schmid-Schönbein ; Edward Jablonski ; Shinichiro J. Tojo ; Yigal Greener ; Takanori Yasu ; Makoto Suematsu ; Anne L. Killam ; Shunichi Fukuda

PURPOSETo characterize the flow dynamics of albumin ultrasound contrast microspheres containing perfluoropropane (PFP) in normal and inflamed microvasculature.MATERIALS AND METHODSMesenteric microvessels of rats were examined after an intravenous injection of fluorocein-labeled erythrocytes or PFP microspheres by fluorescence intravital microscopy with and without local application of 10(-8) M platelet activating factor (PAF) as an experimental form of inflammation.RESULTSAll the microspheres passed freely through arterioles and capillaries. Mean velocities of the microspheres in each vessel were closely correlated with those of erythrocytes. Only a minor fraction of the microspheres was retained in the venules (> or =0.1 s stoppage) by attachment to endothelial cells. The frequency of microsphere retention in venules was significantly enhanced by PAF (2.6+/-2.1%, P<0.01 vs. control), especially in regions with leukocyte adhesion. Treatment with a monoclonal antibody to intercellular adhesion molecule-1, P-selectin or the common leukocyte antigen inhibited PAF-induced microsphere retention in venules (P<0.05). In the inflamed microcirculation, a small subgroup of microspheres becomes attached to venular endothelial cells in regions with leukocyte adhesion via interaction among microspheres, activated leukocytes and endothelial cells via adhesion molecules.CONCLUSIONIn inflamed microcirculation, a small subgroup of microspheres becomes attached to venular endothelial cells in regions with leukocyte adhesion via interaction among microspheres, activated leukocytes and endothelial cells via adhesion molecules. These results suggest that ultrasonography with microspheres has the potential to evaluate inflammatory site distribution as well as tissue perfusion.

01 Sep 2001·American Journal of TherapeuticsQ4 · MEDICINE

Imaging Efficacy of a Hepatocyte-Selective Polyiodinated Triglyceride for Contrast-Enhanced Computed Tomography

Q4 · MEDICINE

Article

Author: Counsell, R E ; Weichert, J P ; Lee, F T ; Longino, M A ; Doerr-Stevens, J K ; Bakan, D A

RATIONALE AND OBJECTIVESDHOG-LE is an injectable polyiodinated triglyceride lipid emulsion providing contrast enhancement of the liver in CT. Studies were conducted to characterize the imaging efficacy of various DHOG-LE formulations as a function of both the administered iodine dose and the formulation composition.MATERIALS AND METHODSFour DHOG-LE preparations consisting of either 10, 20, 25, or 30% (w/v) total lipid were administered to anesthetized female Sprague Dawley rats as single intravenous bolus doses of 50, 100, 150, and/or 300 mg I/kg (n = 3 to 6 rats/formulation and dose). A 25% triolein lipid emulsion prepared without iodine was administered as a vehicle control at the highest dose volume (n = 6). Liver enhancement was evaluated as a function of time (0 to 24 hours) after administration of contrast by analyzing regions of interest from sequential body scans.RESULTSAt all dose levels, liver enhancement was observed after injection of each DHOG-LE formulation. Regardless of formulation composition, similar enhancement of the liver was noted when administered at an equivalent iodine dose. Liver enhancement increased proportionately with increasing iodine dose. Mean peak intensities for 50, 100, 150, and 300 mg I/kg doses were 78 HU (42% above baseline), 101 HU (84% above baseline), 125 HU (127% above baseline), and 195 HU (255% above baseline), respectively. Liver time-intensity profiles exhibited rapid uptake, prolonged enhancement up to 3 hours, and complete clearance of the majority of the formulations tested by 24 hours. Time and duration of peak intensities were also directly related to iodine dose.CONCLUSIONSIn the animal model tested, DHOG-LE imaging efficacy was directly related to iodine dose and was independent of formulation composition. Thus, administration of DHOG-LE in highly concentrated lipid preparations minimized administered dose volume and resulted in appreciable liver enhancement, even at the lowest dose of 50 mg I/kg.

01 Aug 2000·The American Journal of CardiologyQ3 · MEDICINE

Cardiac imaging using optison

Q3 · MEDICINE

Review

Author: Howard C Dittrich ; Leslie N Clark

Optison (human albumin microspheres; Mallinckrodt Inc., San Diego, CA) is an injectable suspension contrast agent indicated for use in left-ventricular chamber opacification and endocardial-border delineation. Substantial proportions of patients undergoing echocardiography have inadequate endocardial delineation and, therefore, wall motion (including stress echocardiography) without contrast. The extent of use of Optison for its current indications is likely to vary, and its use will depend upon the patient population and image quality obtained from noncontrast examinations. Early reports exist of its use in as many as 60% of patients undergoing studies in a given echocardiography laboratory. The rate of acceptance for endocardial delineation in stress echocardiography appears to be particularly high, because of the higher proportion of technically challenging studies whether with fundamental or second harmonic imaging. The ability to aid in differentiation of potential artifacts from pathology in the cavity has also been reported. Clinical studies have been conducted or are currently underway to evaluate Optison in the assessment of acute and chronic ischemic coronary artery disease. Studies in patients with unexplained acute chest pain and during exercise and pharmacologic stress have evaluated the ability of Optison to detect perfusion abnormalities as well as wall-motion abnormalities. The rapid evolution of ultrasound imaging modalities such as harmonic Doppler and broad-bond imaging will further enhance Optison's ability to characterize ischemic heart disease patients.

News (Medical) associated with Molecular Biosystems, Inc.

14 Jun 2023

·www.biospace.com

Dr. Kenneth J. Widder Joins Personalis Board of Directors

FREMONT, Calif.--(BUSINESS WIRE)-- Personalis, Inc. (Nasdaq: PSNL) today announced that it has appointed Kenneth J. Widder, M.D., to its Board of Directors. Dr. Widder currently serves on the boards of QuidelOrtho Corporation and Evoke Pharma, Inc. and has over 40 years of experience working with biomedical companies, having previously served as a founder, director and/or CEO of Sydnexis, Inc., OrphoMed, Inc., Sytera, Inc., NovaCardia, Inc., Santarus, Inc., and Molecular Biosystems Inc., and as a general partner at LVP Life Science Ventures (formerly Latterell Venture Partners) and Windamere Venture Partners. He holds an M.D. from Northwestern University and trained in pathology at Duke University. “We are delighted to have Ken join our Board of Directors at this pivotal time for the company,” said Karin Eastham, Personalis Board Chair. “His extensive industry and board experience with diagnostic and emerging healthcare companies will be a valuable addition to our Board as the company continues to execute on its vision and build its oncology diagnostics business.” The company also announced that Alan Colowick, M.D., has resigned his position as a director of the company, effective June 12, 2023, due to the increasing demands of his other time commitments. “On behalf of my fellow directors, the company’s management team and shareholders, I would like to thank Alan for the significant contributions he made during his years of service on the Personalis Board,” said Ms. Eastham. About Personalis At Personalis, we are transforming the active management of cancer through breakthrough personalized testing. We aim to drive a new paradigm for cancer management, guiding care from biopsy through the life of the patient. Our highly sensitive assays combine tumor-and-normal profiling with proprietary algorithms to deliver advanced insights even as cancer evolves over time. Our products are designed to detect minimal residual disease (MRD) and recurrence at the earliest timepoints, enable selection of targeted therapies based on ultra-comprehensive genomic profiling, and enhance biomarker strategy for drug development. Personalis is based in Fremont, California. To learn more, visit and connect with us on LinkedIn and Twitter. Personalis Forward-Looking Statements All statements in this press release that are not historical are “forward-looking statements” within the meaning of U.S. securities laws, including statements relating to attributes or advantages of Personalis assays or products, Personalis’ business opportunities, leadership, plans, or expectations, or other future events. Such forward-looking statements involve risks and uncertainties that could cause actual results to differ materially from any anticipated results or expectations expressed or implied by such statements. Factors that could materially affect actual results can be found in Personalis’ filings with the U.S. Securities and Exchange Commission, including Personalis’ most recent reports on Forms 8-K, 10-K and 10-Q, and include those listed under the caption “Risk Factors.” Personalis disclaims any obligation to update such forward-looking statements. View source version on businesswire.com: Contacts Investors: Caroline Corner investors@personalis.com 415-202-5678 Source: Personalis, Inc. View this news release online at:

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