BME Faculty
Bluestein, Danny
Professor
Danny.Bluestein@sunysb.edu
Summary : Despite major progress, cardiovascular diseases remain the leading cause of death in the western world. One of the major culprits in cardiovascular disease and in devices designed to treat or restore impaired cardiovascular function is the non-physiologic flow pattern that enhances the hemostatic response mainly through platelet activation. Platelets have long been regarded as the preeminent cell involved in physiologic hemostasis and pathologic thrombosis. An innovative technique for measuring flow induced platelet activation has been developed, and its utility demonstrated in experiments conducted in recirculation devices (models of arterial stenosis, Left Ventricular Assist Device (LVAD), and mechanical heart valves). The mechanisms by which the non-physiologic flow patterns induce platelet activation and generate free emboli, that enhance the risk of cardioembolic stroke, was demonstrated in vivo with mechanical heart valves implanted in the sheep model. The results of this research will aid in elucidating physical forces that regulate cellular function in flowing blood, and may be applied to improve the design of blood recirculating devices and to develop more potent drugs for treating cardiovascular diseases.
Chen, Weiliam
Associate Professor
Weiliam.Chen@sunysb.edu
Summary : Our research is focused on the application of biocompatible/biodegradable natural carbohydrates to address various clinically relevant biomedical problems including wound repair, cerebral aneurysm, arteriovenous malformation, abdominal aortic aneurysm endoleak and controlled delivery of therapeutic agents (small molecules, proteins and DNA) through interdisciplinary research efforts. Localized application provides the maximum efficacies of therapeutic agents while minimizing their undesirable effects. Other efforts are targeted towards ophthalmic issues and enhancing the biological responses of polymeric medical devices.
Chon, Ki
Professor
Ki.Chon@sunysb.edu
Summary : The cardiac autonomic nervous system is responsible for maintaining proper homeostasis, or balance, of the cardiovascular system. One of our major areas of research is to detect, quantify, and interpret differences in dynamic characteristics of the cardiac autonomic nervous system between normal and diseased subjects, in an attempt to find a marker for increased risk of sudden cardiac death. Identifying and quantifying differences in the dynamic characteristics of autonomic function between normal and diseased conditions may lead to a better understanding of the role of autonomic function imbalance in diseased conditions, and should have important clinical diagnostic and prognostic applications. Another active research area is the development of computational modeling approaches to understand differences in dynamics of renal autoregulatory mechanisms between normotensive and hypertensive conditions. For both areas of research, we are developing novel linear and nonlinear signal processing techniques that can be successfully applied to achieve the research objectives.
Clark, Richard
Professor
Richard.Clark@SUNYSB.EDU
Summary : Our laboratory focuses on the design and development of bioactive peptides and 3-D complex extracellular matrices (ECM) that will enhance soft tissue repair and regeneration. Peptides are assayed for biologic activity in vitro and in vivo for their ability to protect tissue cells and organs from injury, stimulate tissue cell migration and proliferation, and modulate stem cell and tissue cell differentiation. The ECM constructs tethered with bioactive peptides are analyzed for their physical, chemical and immunologic properties by such modalities as goniometry for hydrophilicity, static and dynamic stress and strain for viscolastic material properties, atomic force microscopy for Young’s elastic moduli and surface topography; HPLC, mass spectroscopy, gel permeation chromatography and gel electrophoresis for chemical analysis; and fluorescence immunoassays for immunologic epitope mapping. In addition, cell interactions with the 3-D ECM constructs are examined at the transcriptional, protein and functional level as judged by real-time PCR, DNA microarray analyses, Western blots, proteomics, quantitative fluorescence microscopy, and cell viability, migration and proliferation assays. Special in vitro systems have been created to quantify sprout angiogenesis, epithelial sheet migration and neurite axon extension. Bioactive peptides and engineered ECM containing peptide biomimetics will also be tested in a variety of animal models and hopefully enter into clinical trials. This robust array of bioactive peptides and 3-D ECM constructs will provide new therapies for soft tissue injury and disease.
Entcheva, Emilia
Associate Professor
Emilia.Entcheva@sunysb.edu
Summary : The focus of the Cardiac Cell Engineering Laboratory is designing and characterizing heart cell networks and heart tissue in the lab to gain a better understanding of how cardiac cells self-organize and function. We are motivated to provide useful tools for physiomics type of studies, drug, gene and stem cell therapy testing 3D cellular platforms - an experimental setting for validation of computer models of excitable tissue, and ultimately to contribute to strategies for the regeneration of the heart. This research is multidisciplinary in nature and involves a spectrum of experimental molecular and cell biology procedures, along with the application of design concepts from electrical, optical, mechanical and chemical engineering to create the enabling technology for our studies. New imaging modalities, image processing algorithms and computer modeling are essential complementary tools developed and applied by our team. Key research areas include: 1) optical mapping of excitation; 2) advanced signal and imageprocessing; 3) cardiac cell and tissue engineering; 4) unraveling the mechanisms of cardiac arrhythmias.
Frame, Molly
Associate Professor & Undergraduate Program Director
Mary.Frame@sunysb.edu
Summary : " Our emerging understanding of oxygen delivery to the tissues is that the blood flow within the smallest arterioles is tightly organized within repeating networks across the tissue. Central to this new paradigm are the concepts of vascular communication between the beginning and end of the network (via gap junctions), and its relation to flow sensing by the vascular endothelium. Our work has shown that different types of microvascular flow patterns can be triggered by direct stimulation of the focal adhesions (alpha-v-beta-3 integrins, i.e., wound healing), compared to adenosine (i.e., metabolic change), compared to nitric oxide (i.e., inflammation), hence we can control the flow patterns. Among the goals of this work are in vitro construction of transplantable microvascular networks, using bionanotechnology to create the sturdy scaffolding, and verification of nanofabricated drug delivery units within the vasculature. To this end, equally important are mechanotransduction of the physical forces associated with flow change (i.e., wall shear stress), the pharmacologic signal transduction systems involved (which guide drug discovery and intervention), and the molecular basis for the committed step that ensures healthy flow delivery. Our work employs computational modeling of the fluid mechanics, the physiology of arteriolar network blood flow (in vivo and in vitro), and precise genomic manipulation of key proteins in healthy and vascular disease states. "
Hadjiargyrou, Michael
Associate Professor
Michael.Hadjiargyrou@sunysb.edu
Summary : The overall goal of this laboratory is to implement innovative approaches for engineering new musculoskeletal tissue utilizing knowledge derived from molecular/cellular biology and biomaterials. More specifically, we are actively involved in understanding the molecular mechanisms that underlie the wound healing process. The repair of a fractured bone is a complex biological event that essentially recapitulates embryonic development and requires the orchestration of a number of different cell types undergoing proliferation, migration, adhesion and differentiation, all under the direct control of a host of different genes. Understanding the temporal and spatial expression of these genes during the progression of a healing callus will ultimately enable us to comprehend the essential processes of inflammation, chondrogenesis, ossification, and remodeling. The latest methods in molecular/cellular biology are applied in the pursuit of gene discovery, gene structure and function analysis, expression studies and functional perturbations. By identifying and studying genes that play essential roles during the healing process, we hypothesize that this knowledge will facilitate a greater understanding in our ability to elucidate the process of bone development and regeneration and identify ideal gene candidates for possible therapeutic intervention via the use of biomaterials.
Judex, Stefan
Associate Professor
Stefan.Judex@sunysb.edu
Summary : Research in this laboratory focuses on the identification of precise parameters that define skeletal tissue quantity and quality and their perturbation to applied physical stimuli. To this end, state of the art imaging techniques (e.g., microCT or synchrotron infrared spectroscopy) are combined with molecular (e.g., RT-PCR), genetic (e.g., QTL), and engineering techniques (e.g., finite element modeling) to determine genes, molecules, forces, as well as chemical and structural matrix properties. An example for a recent study includes the demonstration that extremely small amplitude oscillatory motions (~ 100µm), inducing negligible deformation in the matrix, can serve as an anabolic stimulus to osteoblasts in vivo, producing a structure that is mechanical stronger and more efficient to withstand forces. Recent results also indicate that there is not only a genetic basis for bone architecture, but also that the sensitivity of bone tissue to both anabolic and catabolic stimuli is influenced by subtle genetic variations. The identification of the specific chromosomal regions that modulate this differential sensitivity is in progress. Clinically, our studies may lead to the development of effective prophylaxes and interventions for osteoporosis, without side-effects and tailored towards the genetic make-up of an individual.
Lin, Wei
Research Assistant Professor
Wei.Lin@sunysb.edu
Summary : Virtual instrumentation is defined as a layer of software and/or hardware added to a general purpose computer in such a fashion that users can interact with the computer as though it were their own custom-designed traditional electronic instrument. The technology represents a fundamental shift from traditional hardware based instrumentation systems to software based systems by using the up-to-date computing technologies. This will greatly facilitate the commercialization of the technology developed in academic laboratory because it can integrate the prototype system efficiently using commercial available hardware modules and software application. This eliminates the development cycles of traditional prototype development process and any modification to the system can be done through software modification instantly. Thus the time period for the translation of academic developed technology to commercial products will be substantially reduced.
Mujica-Parodi, Lilianne
Assistant Professor
lmujicaparodi@gmail.com
Summary : The Laboratory for the Study of Emotion and Cognition (LSEC) performs clinical research on the neurobiology of emotional arousal, and its effects on physiology and cognition. LSEC studies provide simultaneous measurement of neural, cardiac, endocrine, cognitive, immune, genetic and clinical components of the human emotional response. These data are then analyzed using statistics, system identification, and complex systems analyses adapted from control systems engineering to develop data-driven modeling and simulations with wide-ranging applications. LSEC performs integrative multi-disciplinary research on areas as diverse as: the neurobiological etiology, diagnosis, and treatment of schizophrenia and other mental illnesses; factors responsible for and predictive of individual variability among healthy individuals in their vulnerability and resilience to chronic and acute high-stress environments; the impact of high-stress environments on cognitive processing, pre-attentive sensorimotor gating, and strategic decision-making; functional and anatomical connectivity in fMRI, and the biochemistry/physiological effects of human alarm pheromones.
Pan, Yingtian
Associate Professor
Yingtian.Pan@sunysb.edu
Summary : 2D and 3D cross-sectional optical imaging of biological tissue at close to cellular resolution (e.g., 10um) and at depths of 1-3mm can have significant impacts on noninvasive or minimally invasive clinical diagnosis of tissue abnormalities, e.g., tumorigenesis. Laser scanning endoscopes, based on optical coherence tomography (OCT), have been developed and tested on a wide variety of tissues both ex vivo and in vivo. Encouraging results based on animal and human studies show that LSE can provide morphological details correlated well with excisional histology, suggesting its potential for optical biopsy or optically guided biopsy to reduced negative biopsies in clinical practice. Current research of Dr. Pan’s lab is focused on early-stage epithelial cancer detection, diagnosis of cartilage injury and healing, and assessment of engineering tissue growth. In addition, Dr. Pan’s lab studies skin dehydration, geriatric incontinence and laser/biochemical attack to the eye using OCT and light microscopy.
Qin, Yi-Xian
Professor
Yi-Xian.Qin@sunysb.edu
Summary : Early diagnostic of osteoporosis allows for accurate prediction of fracture risk and effective options for early treatment of the bone disease. A new ultrasound technology, based on focused transmission and reception of the acoustic signal, has been developed by Dr. Qin and his team which represents the early stages of development of a unique diagnostic tool for the measure of both bone quantity (density) and quality (strength). These data show a strong correlation between non-invasive ultrasonic prediction and micro-CT determined bone mineral density (r>0.9), and significant correlation between ultrasound and bone stiffness (r>0.8). Considering the ease of use, the non-invasive, non-radiation based signal, and the accuracy of the device, this work opens an entirely new avenue for the early diagnosis of metabolic bone diseases.
Rubin, Clinton
Distinguished Professor & Chair
Clinton.Rubin@sunysb.edu
Summary : Encouraging results show that the application of extremely low level strains to animals and humans will increase bone formation, and thus may represent the much sought after "anabolic" stimulus in bone. More than 15 years of research into non-invasive, non-pharmacological intervention to control osteoporosis, was referenced in Dr. Rubin's paper published in the journal Nature (August 9, 2001; 412:603-604). Dr. Rubin's studies suggest that gentle vibrations on a regular basis will help strengthen the bones in osteoporosis sufferers and increase bone formation. In his study, adult female sheep treated with gentle vibration to their hind legs for 20 minutes daily showed almost 35% more bone density. Clinical trials have been completed on post-menopausal women, children with cerebral palsy, and young women with osteoporosis, all with encouraging results. In expanding the research platform into other physiologic systems, current work demonstrates that these low-level signals influence mesenchymal stem cell differentiation, such that their path to adipocytes is suppressed, and markedly reduces adipose tissue.
Sitharaman, Balaji
Assistant Professor
Balaji.Sitharaman@sunysb.edu
Summary : Our laboratory seeks to integrate advances in nanoscience and technology with the biological sciences and clinical medicine to achieve significant advances in simultaneous molecular diagnostics and therapeutics (theragnosis), drug delivery, and bioengineering. Towards these ends, our research interests involve a multidisciplinary approach for the development of functional (electronic, optical, magnetic, or structural) bionanosystems as contrast agents for molecular imaging, as carriers for drug delivery, and as structural scaffolds for tissue engineering. Our current projects capitalize on the unique properties of carbon nanobiomaterials to develop a) advanced contrast agents (CAs) for molecular magnetic resonance imaging (MRI), b) nanocomposites to improve the physical and biological (osteoconduction and osteoinduction) properties of polymer scaffolds for bone tissue engineering and c) non-viral vectors for gene transfection. We have exploited the potential of Gd-based carbon nanostructures: Gd@C60 metallofullerenes (gadofullerenes) and Gd@Ultrashort-tubes (gadonanotubes) as a new generation of advanced CAs for MRI and shown them to have efficacies up to 100 times greater than current clinical CAs. Our recent studies show that they are particularly well suited for passive (magnetic labels for cellular MRI) and active (pH sensitive probes for cancer detection) MRI-based Molecular Imaging. Single-walled carbon nanotubes (SWNTs) have been proposed as the ideal foundation for the next generation of materials due to their excellent mechanical properties. We have dispersed SWNTs and ultra short SWNTs into fumarate-based polymers to form nanocomposite scaffolds that exhibit mechanical properties far superior to the polymers alone and are osteoconductive as well osteoinductive. Our research work involves material synthesis techniques, physico-chemical characterization techniques, tissue culture and in vivo studies.
Strey, Helmut
Associate Professor & Graduate Program Director
Helmut.Strey@sunysb.edu
Summary : Nature's ability to assemble simple molecular building blocks into highly ordered materials, such as those found in cell membranes, cell nuclei, cytoskeleton, cartilage, or bone presents many fascinating and unanswered questions. We are interested in how to tune the interactions of water-soluble building blocks so as to induce their self-assembly into useful microstructures much needed for the next generation of controlled drug delivery, biosensors and DNA sequencing applications. In particular, we are working on long-range ordered polyelectrolyte-surfactant microemulsions that are used as templates for solid nanoporous materials using polymerization and/or cross-linking strategies. Such materials, because of their well-ordered porous structure, will allow more efficient molecular separation and drug delivery. In addition, we are developing biosensors that are based on biopolymer chiral liquid crystals and quantum dot colloidal crystals. In both cases the softness of the systems allows the induction of a strong optical response to external stimuli. Such sensors should be able to quantitatively detect and measure analyte concentrations at hormonal levels.