Warning: imagejpeg(C:\Inetpub\vhosts\kidney.de\httpdocs\phplern\25107458
.jpg): Failed to open stream: No such file or directory in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 117 Microvasc+Res
2014 ; 96
(ä): 46-54
Nephropedia Template TP
gab.com Text
Twit Text FOAVip
Twit Text #
English Wikipedia
Mechanical forces and lymphatic transport
#MMPMID25107458
Breslin JW
Microvasc Res
2014[Nov]; 96
(ä): 46-54
PMID25107458
show ga
This review examines the current understanding of how the lymphatic vessel
network can optimize lymph flow in response to various mechanical forces.
Lymphatics are organized as a vascular tree, with blind-ended initial lymphatics,
precollectors, prenodal collecting lymphatics, lymph nodes, postnodal collecting
lymphatics and the larger trunks (thoracic duct and right lymph duct) that
connect to the subclavian veins. The formation of lymph from interstitial fluid
depends heavily on oscillating pressure gradients to drive fluid into initial
lymphatics. Collecting lymphatics are segmented vessels with unidirectional
valves, with each segment, called a lymphangion, possessing an intrinsic pumping
mechanism. The lymphangions propel lymph forward against a hydrostatic pressure
gradient. Fluid is returned to the central circulation both at lymph nodes and
via the larger lymphatic trunks. Several recent developments are discussed,
including evidence for the active role of endothelial cells in lymph formation;
recent developments on how inflow pressure, outflow pressure, and shear stress
affect the pump function of the lymphangion; lymphatic valve gating mechanisms;
collecting lymphatic permeability; and current interpretations of the molecular
mechanisms within lymphatic endothelial cells and smooth muscle. An improved
understanding of the physiological mechanisms by which lymphatic vessels sense
mechanical stimuli, integrate the information, and generate the appropriate
response is key for determining the pathogenesis of lymphatic insufficiency and
developing treatments for lymphedema.