Abstract:
:Diluted serum provides a model of interstitial fluid that can be used to study the response of smooth muscle cells (SMCs) to interstitial flow. The effect of serum and some of its components on SMC contraction (area reduction) and intracellular calcium ([Ca2+]i) response were characterized in rat aortic SMC in vitro. Rat aortic SMCs contracted dramatically to fetal bovine serum (FBS), bovine serum albumin (BSA), and lysophosphatidic acid (LPA) within 5 min of exposure. By 30 min, cell areas were significantly reduced. Even at concentrations as low as 0.0005% FBS, 0.004% BSA and 0.25 microM LPA, cell areas were significantly different from controls at 30 min. The [Ca2+]i response was significant for serum and LPA at these low concentration levels, but BSA did not elicit a significant [Ca2+]i response at concentrations of 0.1% or lower. Under calcium controlled conditions in which SMCs were pretreated with 10 microM BAPTA-AM, contraction levels were not statistically different from non-calcium controlled conditions even when SMCs were exposed to the highest concentration of serum, BSA, or LPA. It appears that LPA and albumin are components of interstitial fluid that contribute to SMC contraction through calcium-independent mechanisms.
journal_name
Ann Biomed Engjournal_title
Annals of biomedical engineeringauthors
Ainslie K,Shi ZD,Garanich JS,Tarbell JMdoi
10.1007/s10439-004-7820-7subject
Has Abstractpub_date
2004-12-01 00:00:00pages
1667-75issue
12eissn
0090-6964issn
1573-9686journal_volume
32pub_type
杂志文章abstract::Crowding can substantially affect the transition of a protein between its native (N) and unfolded (U) states via volume exclusion effects. Also, it influences considerably the aggregation (A) of unfolded proteins. To examine the details, we developed an approach for computing the kinetic rates of the process N <--> U ...
journal_title:Annals of biomedical engineering
pub_type: 杂志文章
doi:10.1007/s10439-005-5780-8
更新日期:2005-08-01 00:00:00
abstract::To study the effects of compressive straining on muscle cell deformation and damage an in vitro model system was developed. Myoblasts were seeded in agarose constructs and cultured in growth medium for 4 days. Subsequently, the cells were allowed to fuse into multinucleated myotubes for 8 days in differentiation mediu...
journal_title:Annals of biomedical engineering
pub_type: 杂志文章
doi:10.1114/1.1349698
更新日期:2001-02-01 00:00:00
abstract::Classically, the primary tool for quantifying the dynamics of vergence and other eye movements has been the main sequence. The main sequence is a plot of peak velocity versus response amplitude and is particularly useful for comparing the dynamics of a large number of eye movements over a range of response amplitudes....
journal_title:Annals of biomedical engineering
pub_type: 杂志文章
doi:10.1114/1.162
更新日期:1999-05-01 00:00:00
abstract::Recent evidence suggests that energy substrate metabolism forms the link between gene expression and contractile function of the heart. This hypothesis draws on three seemingly unconnected observations, made in 1941 by three different investigators. The first gave rise to the concept of the dynamic nature of body cons...
journal_title:Annals of biomedical engineering
pub_type: 杂志文章,评审
doi:10.1114/1.1312187
更新日期:2000-08-01 00:00:00
abstract::We examine the influence of the added mass effect (fluid inertia) on mitral valve leaflet stress during isovolumetric phases. To study this effect, oscillating flow is applied to a flexible membrane at various frequencies to control inertia. Resulting membrane strain is calculated through a three-dimensional reconstru...
journal_title:Annals of biomedical engineering
pub_type: 杂志文章
doi:10.1007/s10439-015-1463-8
更新日期:2016-05-01 00:00:00
abstract::High mechanical stress in atherosclerotic plaques at vulnerable sites, called critical stress, contributes to plaque rupture. The site of minimum fibrous cap (FC) thickness (FC(MIN)) and plaque shoulder are well-documented vulnerable sites. The inherent weakness of the FC material at the thinnest point increases the s...
journal_title:Annals of biomedical engineering
pub_type: 杂志文章
doi:10.1007/s10439-010-0078-3
更新日期:2010-10-01 00:00:00
abstract::Linear compartmental models are useful, explanatory tools, that have been widely used to represent the dynamic behavior of complex biological systems. This paper addresses the problem of the numerical identification of such models, i.e., the estimation of the parameter values that will generate predictions closest to ...
journal_title:Annals of biomedical engineering
pub_type: 杂志文章
doi:10.1007/s10439-009-9651-z
更新日期:2009-05-01 00:00:00
abstract::Intra-cardiac flow has been explored for decades but there is still no consensus on whether or not healthy left ventricles (LV) may harbour turbulent-like flow despite its potential physiological and clinical relevance. The purpose of this study is to elucidate if a healthy LV could harbour flow instabilities, using i...
journal_title:Annals of biomedical engineering
pub_type: 杂志文章
doi:10.1007/s10439-016-1614-6
更新日期:2016-11-01 00:00:00
abstract::The temporal and spatial distribution of coronary blood flow, pressure, and volume are determined by the branching pattern and three-dimensional (3-D) geometry of the coronary vasculature, and by the mechanics of heart wall and vascular tone. Consequently, a realistic simulation of coronary blood flow requires, as a f...
journal_title:Annals of biomedical engineering
pub_type: 杂志文章
doi:10.1007/s10439-005-7544-3
更新日期:2005-11-01 00:00:00
abstract::Continuous measurement of arterial blood density after bolus injection of fluids of different density into the right atrium has been used to measure cardiac output and mean transit time through the central circulation. The transit time distribution for density, however, differs from that for plasma-phase tracers such ...
journal_title:Annals of biomedical engineering
pub_type: 杂志文章
doi:10.1007/BF02368628
更新日期:1993-07-01 00:00:00
abstract::Currently, there are no clinically available tools or applications which could predict osteoarthritis development. Some computational models have been presented to simulate cartilage degeneration, but they are not clinically feasible due to time required to build subject-specific knee models. Therefore, the objective ...
journal_title:Annals of biomedical engineering
pub_type: 杂志文章
doi:10.1007/s10439-018-02184-y
更新日期:2019-03-01 00:00:00
abstract::The left-right asymmetry in the potential amplitude on the scalp was studied in poststroke patients by using flash visual evoked potential (VEP) and a numerical two-dimensional model of the head. The left-right asymmetry of the VEP was measured in three patients after thrombosis, in one after hemorrhage, and in one he...
journal_title:Annals of biomedical engineering
pub_type: 临床试验,杂志文章
doi:10.1007/BF02770997
更新日期:1996-01-01 00:00:00
abstract::Hemodynamic parameters play an important role in regulating vascular remodeling in arterio-venous fistula (AVF) maturation. Investigating the changes in hemodynamic parameters during AVF maturation is expected to improve our understanding of fistula failure, but very little data on actual temporal changes in human AVF...
journal_title:Annals of biomedical engineering
pub_type: 杂志文章
doi:10.1007/s10439-012-0703-4
更新日期:2013-04-01 00:00:00
abstract::Much effort is expended in developing biomimetic scaffolds that provide the micro-architecture of native tissue with appropriate cellular niches. Such scaffolds are often seeded with progenitor cells to generate engineered replacements for diseased or damaged tissues. An alternative approach relies on biology, rather ...
journal_title:Annals of biomedical engineering
pub_type: 杂志文章,评审
doi:10.1007/s10439-014-1174-6
更新日期:2015-03-01 00:00:00
abstract::Traditionally, measurement of pulmonary O2 uptake uses mass balance of N2 to correct for differences between inspired and expired volume (V) due to temperature (T) and relative humidity (RH). Often during anesthesia, N2 balance cannot be invoked due to high inspired O2 fraction (FIO2) or nonsteady state conditions. Th...
journal_title:Annals of biomedical engineering
pub_type: 杂志文章
doi:10.1114/1.1312184
更新日期:2000-09-01 00:00:00
abstract::Wall stress analysis of abdominal aortic aneurysm (AAA) is a promising method of identifying AAAs at high risk of rupture. However, neglecting residual strains (RS) in the load-free configuration of patient-specific finite element analysis models is a sever limitation that strongly affects the computed wall stresses. ...
journal_title:Annals of biomedical engineering
pub_type: 杂志文章
doi:10.1007/s10439-013-0749-y
更新日期:2013-07-01 00:00:00
abstract::In this study we present a novel, robust method to couple finite element (FE) models of cardiac mechanics to systems models of the circulation (CIRC), independent of cardiac phase. For each time step through a cardiac cycle, left and right ventricular pressures were calculated using ventricular compliances from the FE...
journal_title:Annals of biomedical engineering
pub_type: 杂志文章
doi:10.1007/s10439-006-9212-7
更新日期:2007-01-01 00:00:00
abstract::A progressive reduction in muscle fiber conduction velocity is typically observed during fatiguing muscle contraction. Although the exact causes of the conduction velocity decrease have not yet been fully established, increasing evidence suggests that changes in extracellular potassium concentration may be largely res...
journal_title:Annals of biomedical engineering
pub_type: 杂志文章
doi:10.1007/s10439-009-9756-4
更新日期:2009-10-01 00:00:00
abstract::Polymeric heart valves have the potential to reduce thrombogenic complications associated with current mechanical valves and overcome fatigue-related problems experienced by bioprosthetic valves. In this paper we characterize the in vitro velocity and Reynolds Shear Stress (RSS) fields inside and downstream of three d...
journal_title:Annals of biomedical engineering
pub_type: 杂志文章
doi:10.1007/s10439-006-9117-5
更新日期:2006-06-01 00:00:00
abstract::Peripheral nerve injuries present challenges to regeneration. Currently, the gold standard for nerve repair is an autograft that results in another region of the body suffering nerve damage. Previously, bioactive borate glass (BBG) has been studied in clinical trials to treat patients with non-healing wounds, and we h...
journal_title:Annals of biomedical engineering
pub_type: 杂志文章
doi:10.1007/s10439-016-1689-0
更新日期:2016-12-01 00:00:00
abstract::Pelvic floor muscle (PFM) strength measurement provides useful information for the study of pelvic floor dysfunctions. Vaginal digital palpation, intravaginal pressure measurements, and the use of a dynamometric speculum represent currently available clinical methods for evaluating PFM strength. However, none of these...
journal_title:Annals of biomedical engineering
pub_type: 杂志文章
doi:10.1007/s10439-009-9728-8
更新日期:2009-08-01 00:00:00
abstract::Early intervention programs aim at improving cognitive and motor outcomes of preterm infants. Intensive custom-tailored training activities are usually accompanied by assessment procedures, which have shortcomings, such as subjectivity, complex setups, and need for structured environments. A novel sensorized system, c...
journal_title:Annals of biomedical engineering
pub_type: 杂志文章
doi:10.1007/s10439-016-1669-4
更新日期:2016-12-01 00:00:00
abstract::As a human grows from birth to adulthood, both airway anatomy and breathing conditions vary, altering the deposition rate and pattern of inhaled aerosols. However, deposition studies have typically focused on adult subjects, results of which may not be readily extrapolated to children. This study numerically evaluated...
journal_title:Annals of biomedical engineering
pub_type: 杂志文章
doi:10.1007/s10439-012-0603-7
更新日期:2012-12-01 00:00:00
abstract::This study was aimed at developing a physical model, supported by experimental observations, to describe the formation and growth of microbubbles seen in patients with mitral mechanical heart valves (MHV). This phenomenon, often referred to as high intensity transient signals (HITS), appears as bright, intense, high-v...
journal_title:Annals of biomedical engineering
pub_type: 杂志文章
doi:10.1114/1.231
更新日期:1999-11-01 00:00:00
abstract::Skeletal muscles can be injured by their own contractions. Such contraction-induced injury, often accompanied by delayed onset of muscle soreness, is a leading cause of the loss of mobility in the rapidly increasing population of elderly people. Unlike other types of muscle injuries which hurt almost exclusively those...
journal_title:Annals of biomedical engineering
pub_type: 杂志文章,评审
doi:10.1007/s10439-014-1173-7
更新日期:2015-02-01 00:00:00
abstract::The manner in which energy from an explosion is transmitted into the brain is currently a highly debated topic within the blast injury community. This study was conducted to investigate the injury biomechanics causing blast-related neurotrauma in the rat. Biomechanical responses of the rat head under shock wave loadin...
journal_title:Annals of biomedical engineering
pub_type: 杂志文章
doi:10.1007/s10439-011-0343-0
更新日期:2011-10-01 00:00:00
abstract::Opportunities to provide clinical immersion experiences to bioengineering undergraduate students have expanded over the last several years. These programs allow students to observe the clinical environment in order to better understand workflow processes, the context in which medical equipment is used, and identify un...
journal_title:Annals of biomedical engineering
pub_type: 杂志文章
doi:10.1007/s10439-020-02508-x
更新日期:2020-09-01 00:00:00
abstract::This study is aimed at refining our understanding of the role of vortex formation at mitral mechanical heart valve (MHV) closure and its association with the high intensity transient signals (HITS) seen in echocardiographic studies with MHV recipients. Previously reported numerical results described a twofold process ...
journal_title:Annals of biomedical engineering
pub_type: 杂志文章
doi:10.1007/s10439-007-9293-y
更新日期:2007-07-01 00:00:00
abstract::The unique resource constraints, urgency, and virulence of the coronavirus disease 2019 pandemic has sparked immense innovation in the development of barrier devices to protect healthcare providers from infectious airborne particles generated by patients during airway management interventions. Of the existing devices,...
journal_title:Annals of biomedical engineering
pub_type: 社论
doi:10.1007/s10439-020-02599-6
更新日期:2020-10-01 00:00:00
abstract::Changes in fetal magnetocardiographic (fMCG) signals are indicators for fetal body movement. We propose a novel approach to reliably extract fetal body movements based on the field strength of the fMCG signal independent of its frequency. After attenuating the maternal MCG, we use a Hilbert transform approach to ident...
journal_title:Annals of biomedical engineering
pub_type: 杂志文章
doi:10.1007/s10439-010-0231-z
更新日期:2011-03-01 00:00:00