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Normal dendritic cell mobilization to lymph nodes under conditions of severe lymphatic hypoplasia§

Identifieur interne : 003346 ( Main/Exploration ); précédent : 003345; suivant : 003347

Normal dendritic cell mobilization to lymph nodes under conditions of severe lymphatic hypoplasia§

Auteurs : Andrew M. Platt [États-Unis] ; Joseph M. Rutkowski [Suisse] ; Catherine Martel [États-Unis] ; Emma L. Kuan [États-Unis] ; Stoyan Ivanov [États-Unis] ; Melody A. Swartz [Suisse] ; Gwendalyn J. Randolph [États-Unis]

Source :

RBID : PMC:3634097

Abstract

To address the requirement for lymphatic capillaries in DC mobilization from skin to lymph nodes, we utilized mice bearing one inactivate allele of VEGFR3 where skin lymphatic capillaries are reported absent. Unexpectedly, DC mobilization from the back skin to draining lymph nodes was similar in magnitude and kinetics to control mice and humoral immunity appeared intact. By contrast, DC migration from body extremities, including ear and forepaws, was ablated. An evaluation in different regions of skin revealed rare patches of lymphatic capillaries only in body trunk areas where migration was intact. That is, whereas the ear skin was totally devoid of lymphatic capillaries, residual capillaries in the back skin were present, though retained only at ~10% normal density. This reduction in density markedly reduced the clearance of soluble tracers, indicating that normal cell migration was spared under conditions when lymphatic transport function was poor. Residual lymphatic capillaries expressed slightly higher levels of CCL21 and migration of skin DCs to lymph nodes remained dependent upon CCR7 in Chy mice. DC migration from the ear could be rescued by the introduction of a limited number of lymphatic capillaries through skin transplantation. Thus, the development of lymphatic capillaries in the skin of body extremities was more severely impacted by a mutant copy of VEGFR3 than trunk skin, but lymphatic transport function was markedly reduced throughout the skin, demonstrating that even under conditions when a marked loss in lymphatic capillary density reduces lymph transport, DC migration from skin to lymph nodes remains normal.


Url:
DOI: 10.4049/jimmunol.1202600
PubMed: 23530147
PubMed Central: 3634097


Affiliations:


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Le document en format XML

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<p id="P1">To address the requirement for lymphatic capillaries in DC mobilization from skin to lymph nodes, we utilized mice bearing one inactivate allele of VEGFR3 where skin lymphatic capillaries are reported absent. Unexpectedly, DC mobilization from the back skin to draining lymph nodes was similar in magnitude and kinetics to control mice and humoral immunity appeared intact. By contrast, DC migration from body extremities, including ear and forepaws, was ablated. An evaluation in different regions of skin revealed rare patches of lymphatic capillaries only in body trunk areas where migration was intact. That is, whereas the ear skin was totally devoid of lymphatic capillaries, residual capillaries in the back skin were present, though retained only at ~10% normal density. This reduction in density markedly reduced the clearance of soluble tracers, indicating that normal cell migration was spared under conditions when lymphatic transport function was poor. Residual lymphatic capillaries expressed slightly higher levels of CCL21 and migration of skin DCs to lymph nodes remained dependent upon CCR7 in
<italic>Chy</italic>
mice. DC migration from the ear could be rescued by the introduction of a limited number of lymphatic capillaries through skin transplantation. Thus, the development of lymphatic capillaries in the skin of body extremities was more severely impacted by a mutant copy of VEGFR3 than trunk skin, but lymphatic transport function was markedly reduced throughout the skin, demonstrating that even under conditions when a marked loss in lymphatic capillary density reduces lymph transport, DC migration from skin to lymph nodes remains normal.</p>
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