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2016 ; 89
(6
): 1231-43
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Ligand trap for the activin type IIA receptor protects against vascular disease
and renal fibrosis in mice with chronic kidney disease
#MMPMID27165838
Agapova OA
; Fang Y
; Sugatani T
; Seifert ME
; Hruska KA
Kidney Int
2016[Jun]; 89
(6
): 1231-43
PMID27165838
show ga
The causes of cardiovascular mortality associated with chronic kidney disease
(CKD) are partly attributed to the CKD-mineral bone disorder (CKD-MBD). The
causes of the early CKD-MBD are not well known. Our discovery of Wnt (portmanteau
of wingless and int) inhibitors, especially Dickkopf 1, produced during renal
repair as participating in the pathogenesis of the vascular and skeletal
components of the CKD-MBD implied that additional pathogenic factors are
critical. In the search for such factors, we studied the effects of activin
receptor type IIA (ActRIIA) signaling by using a ligand trap for the receptor,
RAP-011 (a soluble extracellular domain of ActRIIA fused to a murine IgG-Fc
fragment). In a mouse model of CKD that stimulated atherosclerotic calcification,
RAP-011 significantly increased aortic ActRIIA signaling assessed by the levels
of phosphorylated Smad2/3. Furthermore, RAP-011 treatment significantly reversed
CKD-induced vascular smooth muscle dedifferentiation as assessed by smooth muscle
22? levels, osteoblastic transition, and neointimal plaque calcification. In the
diseased kidneys, RAP-011 significantly stimulated ?klotho levels and it
inhibited ActRIIA signaling and decreased renal fibrosis and proteinuria. RAP-011
treatment significantly decreased both renal and circulating Dickkopf 1 levels,
showing that Wnt activation was downstream of ActRIIA. Thus, ActRIIA signaling in
CKD contributes to the CKD-MBD and renal fibrosis. ActRIIA signaling may be a
potential therapeutic target in CKD.
|Activin Receptors, Type II/*metabolism
[MESH]
|Animals
[MESH]
|Aorta/metabolism
[MESH]
|Atherosclerosis/blood/*prevention & control
[MESH]
|Chronic Kidney Disease-Mineral and Bone Disorder/blood/*drug therapy/metabolism
[MESH]
|Disease Models, Animal
[MESH]
|Fibrosis
[MESH]
|Glucuronidase
[MESH]
|Humans
[MESH]
|Injections, Subcutaneous
[MESH]
|Intercellular Signaling Peptides and Proteins/blood
[MESH]
|Kidney/pathology
[MESH]
|Klotho Proteins
[MESH]
|Male
[MESH]
|Mice
[MESH]
|Mice, Inbred C57BL
[MESH]
|Microfilament Proteins/metabolism
[MESH]
|Muscle Proteins/metabolism
[MESH]
|Phosphorylation
[MESH]
|Protective Agents/administration & dosage/*therapeutic use
[MESH]
|Proteinuria
[MESH]
|Receptors, Cell Surface/metabolism
[MESH]
|Recombinant Fusion Proteins/administration & dosage/*therapeutic use
[MESH]