Adrenomedullin induces lymphangiogenesis and ameliorates secondary lymphoedema.

Abstract:

AIMS:Adrenomedullin (AM) is a multifunctional peptide hormone that plays a significant role in vasodilation and angiogenesis. Lymphoedema is a common but refractory disorder that is difficult to be treated with conventional therapy. We therefore investigated whether AM promotes lymphangiogenesis and improves lymphoedema. METHODS AND RESULTS:The effects of AM on lymphatic endothelial cells (LEC) were investigated. AM promoted proliferation, migration, and network formation of cultured human lymphatic microvascular endothelial cells (HLMVEC). AM increased intracellular cyclic adenosine monophosphate (cAMP) level in HLMVEC. The cell proliferation induced by AM was inhibited by a cAMP antagonist and mitogen-activated protein kinase kinase (MEK) inhibitors. Phosphorylated extracellular signal-regulated kinase (ERK) in HLMVEC was increased by AM. Continuous administration of AM (0.05 microg/kg/min) to BALB/c mice with tail lymphoedema resulted in a decrease in lymphoedema thickness. AM treatment increased the number of lymphatic vessels and blood vessels in the injury site. CONCLUSION:AM promoted LEC proliferation at least in part through the cAMP/MEK/ERK pathway, and infusion of AM induced lymphangiogenesis and improved lymphoedema in mice.

journal_name

Cardiovasc Res

journal_title

Cardiovascular research

authors

Jin D,Harada K,Ohnishi S,Yamahara K,Kangawa K,Nagaya N

doi

10.1093/cvr/cvn228

subject

Has Abstract

pub_date

2008-12-01 00:00:00

pages

339-45

issue

3

eissn

0008-6363

issn

1755-3245

pii

cvn228

journal_volume

80

pub_type

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