Extracellular matrix-derived products modulate endothelial and progenitor cell migration and proliferation in vitro and stimulate regenerative healing in vivo.
Most adult mammals heal without restorative replacement of lost tissue and instead form scar tissue at an injury site. One exception is the adult MRL/MpJ mouse that can regenerate ear and cardiac tissue after wounding with little evidence of scar tissue formation. Following production of a MRL mouse ear hole, 2mm in diameter, a structure rapidly forms at the injury site that resembles the amphibian blastema at a limb amputation site during limb regeneration. We have isolated MRL blastemal cells (MRL-B) from this structure and adapted them to culture. We demonstrate by RT-PCR that even after continuous culturing of these cells they maintain expression of several progenitor cell markers, including DLK (Pref-1), and Msx-1. We have isolated the underlying extracellular matrix (ECM) produced by these MRL-B cells using a new non-proteolytic method and studied the biological activities of this cell-free ECM. Multiplex microELISA analysis of MRL-B cell-free ECM vs. cells revealed selective enrichment of growth factors such as bFGF, HGF and KGF in the matrix compartment. The cell-free ECM, degraded by mild enzyme treatment, was active in promoting migration and proliferation of progenitor cells in vitro and accelerating wound closure in a mouse full thickness cutaneous wound assay in vivo. In vivo, a single application of MRL-B cell matrix-derived products to full thickness cutaneous wounds in non-regenerative mice, B6, induced re-growth of pigmented hair, dermis and epidermis at the wound site whereas scar tissue replaced these tissues at wound sites in mice treated with vehicle alone. These studies suggest that matrix-derived products can stimulate regenerative healing and avert scar tissue formation in adult mammals.
Vorotnikova
Ekaterina
E
Department of Biological Sciences, University of Massachusetts, Lowell, MA 01854, USA.
McIntosh
Donna
D
Dewilde
Abiche
A
Zhang
Jianping
J
Reing
Janet E
JE
Zhang
Li
L
Cordero
Kevin
K
Bedelbaeva
Khamilia
K
Gourevitch
Dimitri
D
Heber-Katz
Ellen
E
Badylak
Stephen F
SF
Braunhut
Susan J
SJ
D000825:Animal Structures / Q000033:anatomy & histology / Q000166:cytology; D000818:Animals; D000943:Antigens, Differentiation / Q000235:genetics; D002465:Cell Movement / Q000187:drug effects* / Q000502:physiology; D049109:Cell Proliferation / Q000187:drug effects*; D002633:Chemotaxis / Q000187:drug effects / Q000502:physiology; D004423:Ear / Q000473:pathology; D042783:Endothelial Cells / Q000166:cytology*; D005109:Extracellular Matrix / Q000378:metabolism*; D005260:Female; D016222:Fibroblast Growth Factor 2 / Q000378:metabolism; D015870:Gene Expression / Q000235:genetics; D006493:Heparin / Q000378:metabolism; D036341:Intercellular Signaling Peptides and Proteins / Q000378:metabolism; D051379:Mice; D008810:Mice, Inbred C57BL; D019463:Mice, Inbred MRL lpr; D010434:Pepsin A / Q000037:antagonists & inhibitors / Q000378:metabolism; D010446:Peptide Fragments / Q000494:pharmacology* / Q000627:therapeutic use; D012867:Skin / Q000473:pathology; D013234:Stem Cells / Q000166:cytology* / Q000378:metabolism; D019063:Tenascin / Q000235:genetics / Q000378:metabolism; D014945:Wound Healing / Q000187:drug effects* / Q000502:physiology; D014947:Wounds and Injuries / Q000473:pathology
D000943:Antigens, Differentiation; D036341:Intercellular Signaling Peptides and Proteins; D010446:Peptide Fragments; D019063:Tenascin; D016222:Fibroblast Growth Factor 2; D006493:Heparin; D010434:Pepsin A