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Lymphatic pump

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https://www.readbyqxmd.com/read/29022300/photoacoustic-imaging-of-lymphatic-pumping
#1
Alex Forbrich, Andrew Heinmiller, Roger J Zemp
The lymphatic system is responsible for fluid homeostasis and immune cell trafficking and has been implicated in several diseases, including obesity, diabetes, and cancer metastasis. Despite its importance, the lack of suitable in vivo imaging techniques has hampered our understanding of the lymphatic system. This is, in part, due to the limited contrast of lymphatic fluids and structures. Photoacoustic imaging, in combination with optically absorbing dyes or nanoparticles, has great potential for noninvasively visualizing the lymphatic vessels deep in tissues...
October 2017: Journal of Biomedical Optics
https://www.readbyqxmd.com/read/28981324/detailed-analysis-of-insulin-absorption-variability-and-the-tissue-response-to-continuous-subcutaneous-insulin-infusion-catheter-implantation-in-swine
#2
Jasmin R Hauzenberger, Brian R Hipszer, Channy Loeum, Peter A McCue, Mark DeStefano, Marc C Torjman, Mahmut T Kaner, Alek R Dinesen, Inna Chervoneva, Thomas R Pieber, Jeffrey I Joseph
BACKGROUND: Worldwide, ∼1 million people manage their type 1 diabetes with an insulin pump and a continuous subcutaneous insulin infusion (CSII) catheter. Patients routinely insert a new catheter every 2-3 days due to increasing variability of insulin absorption over time. Catheter insertion and maintenance damage capillaries, lymphatics, cells, and connective tissue leading to an acute inflammatory response. METHODS: We compared an investigational CSII catheter (IC) and a commercial CSII catheter (CC) regarding insulin absorption pharmacokinetics (PK) and tissue inflammation...
October 5, 2017: Diabetes Technology & Therapeutics
https://www.readbyqxmd.com/read/28946612/meditative-movement-energetic-and-physical-analyses-of-three-qigong-exercises-unification-of-eastern-and-western-mechanistic-exercise-theory
#3
Penelope Klein, George Picard, Joseph Baumgarden, Roger Schneider
Abstract: Qigong is the meditative movement and therapeutic exercise of Eastern medicine. A growing body of evidence is validating its health benefits leading to mechanistic questions of how it works. The purpose of this article is to explore mechanisms of action related to Qigong, with the intent of unifying Eastern and Western exercise theory and to present a model for Qigong exercise analysis. Three exercises from a standardized Qigong form: 'Plucking the Stars', 'Lotus Leaves Rustle in the Wind', and 'Pacing Forwards and Backwards' were selected for meditative, energetic, and physical analyses...
September 23, 2017: Medicines (Basel, Switzerland)
https://www.readbyqxmd.com/read/28935890/demonstration-and-analysis-of-the-suction-effect-for-pumping-lymph-from-tissue-beds-at-subatmospheric-pressure
#4
Samira Jamalian, Mohammad Jafarnejad, Scott D Zawieja, Christopher D Bertram, Anatoliy A Gashev, David C Zawieja, Michael J Davis, James E Moore
Many tissues exhibit subatmospheric interstitial pressures under normal physiologic conditions. The mechanisms by which the lymphatic system extracts fluid from these tissues against the overall pressure gradient are unknown. We address this important physiologic issue by combining experimental measurements of contractile function and pressure generation with a previously validated mathematical model. We provide definitive evidence for the existence of 'suction pressure' in collecting lymphatic vessels, which manifests as a transient drop in pressure downstream of the inlet valve following contraction...
September 21, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28877002/lymphedema-pathogenesis-and-novel-therapies
#5
Joseph H Dayan, Catherine L Ly, Raghu P Kataru, Babak J Mehrara
Lymphedema affects up to 1 in 6 patients who undergo treatment for a solid tumor in the United States. Its prevalence has increased as more effective oncologic therapies have improved patient survival, but there remains no definitive cure. Recent research has elucidated new details in the pathogenesis of the disease and has demonstrated that it is fundamentally an immunologic progress that ultimately results in inflammation, fibroadipose deposition, impaired lymphangiogenesis, and dysfunctional lymphatic pumping...
September 6, 2017: Annual Review of Medicine
https://www.readbyqxmd.com/read/28827843/the-passive-biomechanics-of-human-pelvic-collecting-lymphatic-vessels
#6
Dimitrios Athanasiou, Lowell T Edgar, Mohammad Jafarnejad, Katherine Nixon, Delfim Duarte, Edwin D Hawkins, Samira Jamalian, Paula Cunnea, Cristina Lo Celso, Shunichi Kobayashi, Christina Fotopoulou, James E Moore
The lymphatic system has a major significance in the metastatic pathways in women's cancers. Lymphatic pumping depends on both extrinsic and intrinsic mechanisms, and the mechanical behavior of lymphatic vessels regulates the function of the system. However, data on the mechanical properties and function of human lymphatics are lacking. Our aim is to characterize, for the first time, the passive biomechanical behavior of human collecting lymphatic vessels removed at pelvic lymph node dissection during primary debulking surgeries for epithelial ovarian cancer...
2017: PloS One
https://www.readbyqxmd.com/read/28795517/cardiovascular-adaptation-to-the-fontan-circulation
#7
REVIEW
Gruschen R Veldtman, Alexander R Opotowsky, Samuel G Wittekind, Jack Rychik, Daniel J Penny, Mark Fogel, Bradley S Marino, Marc Gewillig
Although medium-term survival following Fontan operations in the modern era has improved dramatically, late cardiovascular and extracardiac morbidity are common and are associated with impaired quality of life and premature late mortality. This serves as a reminder of the extraordinary adaptations required of the cardiovascular system when the systemic arterial, systemic venous and pulmonary circulations are placed in series coupled to a single ventricular pump. This article reviews the key features and principles that govern interactions between the ventricle, systemic arterial circulation, the systemic venous and pulmonary circulatory compartments, the microcirculation, and lymphatic circulations...
August 10, 2017: Congenital Heart Disease
https://www.readbyqxmd.com/read/28749720/a-validation-study-of-near-infrared-fluorescence-imaging-of-lymphatic-vessels-in-humans
#8
Jacob Hinnerup Groenlund, Niklas Telinius, Soeren Nielsen Skov, Vibeke Hjortdal
BACKGROUND: Near-infrared fluorescence (NIRF) imaging is a new imaging technique that is used to visualize lymphatic vessels in humans. It has a high spatial and temporal resolution, allowing real-time visualization of lymphatic flow. METHODS AND RESULTS: The current study investigated the intra- and inter-individual variability of the technique, and how local hypo- and hyperthermia (20°C, 40°C), as well as exercise affect lymph transport. In this study, 10 healthy volunteers were studied twice, with 2 weeks between...
September 2017: Lymphatic Research and Biology
https://www.readbyqxmd.com/read/28700145/simultaneous-measurements-of-lymphatic-vessel-contraction-flow-and-valve-dynamics-in-multiple-lymphangions-using-optical-coherence-tomography
#9
Cedric Blatter, Eelco F J Meijer, Timothy P Padera, Benjamin J Vakoc
Lymphatic dysfunction is involved in many diseases including lymphedema, hypertension, autoimmune responses, graft rejection, atherosclerosis, microbial infections, cancer and cancer metastasis. Expanding our knowledge of lymphatic system function can lead to a better understanding of these disease processes and improve treatment options. Here, optical coherence tomography (OCT) methods were used to reveal intraluminal valve dynamics in 3 dimensions, and measure lymph flow and vessel contraction simultaneously in 3 neighboring lymphangions of the afferent collecting lymphatic vessels to the popliteal lymph node in mice...
July 12, 2017: Journal of Biophotonics
https://www.readbyqxmd.com/read/28699120/valve-related-modes-of-pump-failure-in-collecting-lymphatics-numerical-and-experimental-investigation
#10
C D Bertram, C Macaskill, M J Davis, J E Moore
Lymph is transported along collecting lymphatic vessels by intrinsic and extrinsic pumping. The walls have muscle of a type intermediate between blood-vascular smooth muscle and myocardium; a contracting segment between two valves (a lymphangion) constitutes a pump. This intrinsic mechanism is investigated ex vivo in isolated, spontaneously contracting, perfused segments subjected to controlled external pressures. The reaction to varying afterload is probed by slowly ramping up the outlet pressure until pumping fails...
July 11, 2017: Biomechanics and Modeling in Mechanobiology
https://www.readbyqxmd.com/read/28648385/fluorescence-imaging-of-lymphatic-outflow-of-cerebrospinal-fluid-in-mice
#11
Sunkuk Kwon, Christopher F Janssen, Fred Christian Velasquez, Eva M Sevick-Muraca
Cerebrospinal fluid (CSF) is known to be reabsorbed by the lymphatic vessels and drain into the lymph nodes (LNs) through peripheral lymphatic vessels. In the peripheral lymphatics, the contractile pumping action of lymphangions mediates lymph drainage; yet it is unknown whether lymphatic vessels draining cranial and spinal CSF show similar function. Herein, we used non-invasive near-infrared fluorescence imaging (NIRFI) to image (i) indocyanine green (ICG) distribution along the neuraxis and (ii) routes of ICG-laden CSF outflow into the lymphatics following intrathecal lumbar administration...
October 2017: Journal of Immunological Methods
https://www.readbyqxmd.com/read/28566090/lymphatic-delivery-of-etanercept-via-nanotopography-improves-response-to-collagen-induced-arthritis
#12
Melissa B Aldrich, Fred C Velasquez, Sunkuk Kwon, Ali Azhdarinia, Kenneth Pinkston, Barrett R Harvey, Wenyaw Chan, John C Rasmussen, Russell F Ross, Caroline E Fife, E M Sevick-Muraca
BACKGROUND: Evidence suggests lymphatic function mediates local rheumatoid arthritis (RA) flares. Yet biologics that target the immune system are dosed systemically via the subcutaneous (SC) administration route, thereby inefficiently reaching local lymphatic compartments. Nanotopography has previously been shown to disrupt tight cellular junctions, potentially enhancing local lymphatic delivery and potentially improving overall therapeutic efficacy. METHOD: We first characterized nanotopography (SOFUSA™) delivery of an anti-TNF drug, etanercept, by comparing pharmacokinetic profiles to those obtained by conventional SC, intravenous (IV), and intradermal (ID) routes of administration, and assessed uptake of radiolabeled etanercept in draining lymph nodes (LNs) in single dosing studies...
May 31, 2017: Arthritis Research & Therapy
https://www.readbyqxmd.com/read/28530642/rasa1-regulates-the-function-of-lymphatic-vessel-valves-in-mice
#13
Philip E Lapinski, Beth A Lubeck, Di Chen, Abbas Doosti, Scott D Zawieja, Michael J Davis, Philip D King
Capillary malformation-arteriovenous malformation (CM-AVM) is a blood and lymphatic vessel (LV) disorder that is caused by inherited inactivating mutations of the RASA1 gene, which encodes p120 RasGAP (RASA1), a negative regulator of the Ras small GTP-binding protein. How RASA1 mutations lead to the LV leakage defects that occur in CM-AVM is not understood. Here, we report that disruption of the Rasa1 gene in adult mice resulted in loss of LV endothelial cells (LECs) specifically from the leaflets of intraluminal valves in collecting LVs...
June 30, 2017: Journal of Clinical Investigation
https://www.readbyqxmd.com/read/28231612/the-pro-inflammatory-cytokine-tnf-%C3%AE-inhibits-lymphatic-pumping-via-activation-of-the-nf-%C3%AE%C2%BAb-inos-signaling-pathway
#14
Yingxuan Chen, Sonia Rehal, Simon Roizes, Hai-Lei Zhu, William C Cole, Pierre-Yves von der Weid
OBJECTIVE: Mesenteric lymphatic vessel pumping, important to propel lymph and immune cells from the intestinal interstitium to the mesenteric lymph nodes, is compromised during intestinal inflammation. The objective of this study was to test the hypothesis that the pro-inflammatory cytokine TNF-α, is a significant contributor to the inflammation-induced lymphatic contractile dysfunction, and to determine its mode of action. METHODS: Contractile parameters were obtained from isolated rat mesenteric lymphatic vessels mounted on a pressure myograph after 24-hours incubation with or without TNF-α...
April 2017: Microcirculation: the Official Journal of the Microcirculatory Society, Inc
https://www.readbyqxmd.com/read/27981590/dietary-restriction-and-aerobic-exercise-attenuate-obesity-induced-lymphatic-dysfunction
#15
Shin-Haw Lee, Sina Hadipour-Lakmehsari
No abstract text is available yet for this article.
March 15, 2017: Journal of Physiology
https://www.readbyqxmd.com/read/27935958/synchronization-and-random-triggering-of-lymphatic-vessel-contractions
#16
James W Baish, Christian Kunert, Timothy P Padera, Lance L Munn
The lymphatic system is responsible for transporting interstitial fluid back to the bloodstream, but unlike the cardiovascular system, lacks a centralized pump-the heart-to drive flow. Instead, each collecting lymphatic vessel can individually contract and dilate producing unidirectional flow enforced by intraluminal check valves. Due to the large number and spatial distribution of such pumps, high-level coordination would be unwieldy. This leads to the question of how each segment of lymphatic vessel responds to local signals that can contribute to the coordination of pumping on a network basis...
December 2016: PLoS Computational Biology
https://www.readbyqxmd.com/read/27756859/a-specifically-designed-aquatic-exercise-protocol-to-reduce-chronic-lower-limb-edema
#17
Sergio Gianesini, Mirko Tessari, Primo Bacciglieri, Anna Maria Malagoni, Erica Menegatti, Savino Occhionorelli, Nino Basaglia, Paolo Zamboni
Objective Despite the fact that muscle pump activation is known to positively impact chronic lower limb edema, objective measurements of standardized exercises for venous-lymphatic rehab are lacking. The aim of this investigation is to determine the effectiveness of an addressed physical activity exploiting the advantages of an aquatic environment. Material and methods Thirty-two lower limbs of 16 patients affected by bilateral chronic leg swelling were included (12 females, 4 males). All the patients underwent a protocol of five sessions of physical exercises specifically conceived inside a pool...
October 2017: Phlebology
https://www.readbyqxmd.com/read/27752703/optical-tracer-size-differences-allow-quantitation-of-active-pumping-rate-versus-stokes-einstein-diffusion-in-lymphatic-transport
#18
Alisha V DSouza, Kayla Marra, Jason R Gunn, Kimberley S Samkoe, Brian W Pogue
Lymphatic uptake of interstitially administered agents occurs by passive convective–diffusive inflow driven by interstitial concentration and pressure, while the downstream lymphatic transport is facilitated by active propulsive contractions of lymphatic vessel walls. Near-infrared fluorescence imaging in mice was used to measure these central components of lymphatic transport for the first time, using two different-sized molecules––methylene blue (MB) and fluorescence-labeled antibody immunoglobulin G (IgG)-IRDye 680RD...
October 1, 2016: Journal of Biomedical Optics
https://www.readbyqxmd.com/read/27747278/efficacy-of-argon-plasma-coagulation-in-the-management-of-portal-hypertensive-gastropathy
#19
Amr Shaaban Hanafy, Amr Talaat El Hawary
Objectives: Evaluation of the outcome and experience in 2 years of management of portal hypertensive gastropathy (PHG) by argon plasma coagulation (APC) in a cohort of Egyptian cirrhotic patients. Methods: This study was conducted over a 2-year period from January 2011 to February 2013. Upper gastrointestinal endoscopy was performed to evaluate the degree and site of PHG. APC was applied to areas with mucosal vascular lesions. Results: In total, 200 cirrhotic patients were enrolled; 12 patients were excluded due to death (n = 6) caused by hepatic encephalopathy (n = 3), hepatorenal syndrome (n = 2), or chronic lymphatic leukemia (n = 1), or did not complete the treatment sessions (n = 6), so 188 patients completed the study...
October 2016: Endoscopy International Open
https://www.readbyqxmd.com/read/27730311/effect-of-lidocaine-with-and-without-epinephrine-on-lymphatic-contractile-activity-in-mice-in-vivo
#20
Sunkuk Kwon, Eva M Sevick-Muraca
A local anesthetic, lidocaine, is known to affect cutaneous blood flow when injected into the skin. However, it is unknown if dermal lymphatic function can also be affected. Therefore, we characterized lymphatic function in response to administration of lidocaine with and without epinephrine. Non-invasive near-infrared fluorescence imaging (NIRFI) with intradermal injection of indocyanine green (ICG) was used to characterize the lymphatic "pumping" function in mice after subcutaneous injection of 2 % lidocaine with and without 1:100,000 epinephrine or saline...
December 2016: Journal of Anesthesia
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