p21Cip1 modulates arterial wound repair through the stromal cell-derived factor-1/CXCR4 axis in mice.
Cyclin-dependent kinase inhibitors, including p21Cip1, are implicated in cell turnover and are active players in cardiovascular wound repair. Here, we show that p21Cip1 orchestrates the complex interactions between local vascular and circulating immune cells during vascular wound repair. In response to femoral artery mechanical injury, mice with homozygous deletion of p21Cip1 displayed accelerated proliferation of VSMCs and increased immune cell infiltration. BM transplantation experiments indicated that local p21Cip1 plays a pivotal role in restraining excessive proliferation during vascular wound repair. Increased local vascular stromal cell-derived factor-1 (SDF-1) levels were observed after femoral artery injury in p21+/+ and p21-/- mice, although this was significantly greater in p21-/- animals. In addition, disruption of SDF-1/CXCR4 signaling inhibited the proliferative response during vascular remodeling in both p21+/+ and p21-/- mice. We provide evidence that the JAK/STAT signaling pathway is an important regulator of vascular SDF-1 levels and that p21Cip1 inhibits STAT3 binding to the STAT-binding site within the murine SDF-1 promoter. Collectively, these results suggest that p21Cip1 activity is essential for the regulation of cell proliferation and inflammation after arterial injury in local vascular cells and that the SDF-1/CXCR4 signaling system is a key mediator of vascular proliferation in response to injury.
Olive
Michelle
M
Genome Technology Branch, National Human Genome Research Institute, Bethesda, Maryland 20817, USA.
Mellad
Jason A
JA
Beltran
Leilani E
LE
Ma
Mingchao
M
Cimato
Thomas
T
Noguchi
Audrey C
AC
San
Hong
H
Childs
Richard
R
Kovacic
Jason C
JC
Boehm
Manfred
M
D000818:Animals; D017209:Apoptosis; D049109:Cell Proliferation; D054377:Chemokine CXCL12 / Q000378:metabolism*; D050759:Cyclin-Dependent Kinase Inhibitor p21 / Q000096:biosynthesis*; D005263:Femoral Artery / Q000473:pathology; D006720:Homozygote; D051379:Mice; D008822:Mice, Transgenic; D008954:Models, Biological; D019718:Receptors, CXCR4 / Q000378:metabolism*; D013601:T-Lymphocytes / Q000378:metabolism; D013997:Time Factors; D016159:Tumor Suppressor Protein p53 / Q000378:metabolism; D014945:Wound Healing
C493957:Cdkn1a protein, mouse; D054377:Chemokine CXCL12; D050759:Cyclin-Dependent Kinase Inhibitor p21; D019718:Receptors, CXCR4; D016159:Tumor Suppressor Protein p53