TY - JOUR
T1 - S100A8/A9 deficiency in nonhealing venous leg ulcers uncovered by multiplexed antibody microarray profiling
AU - Trøstrup, H
AU - Lundquist, Rasmus
AU - Christensen, L H
AU - Jorgensen, L N
AU - Karlsmark, T
AU - Haab, B B
AU - Ågren, Sven Per Magnus
N1 - © 2011 The Authors. BJD © 2011 British Association of Dermatologists 2011.
PY - 2011/8
Y1 - 2011/8
N2 - Background Knowledge on the underlying mechanisms for nonhealing chronic wounds is fragmentary. Objectives To increase our understanding of the pathogenesis, the relationship between healing ability and a large panel of proteins was studied using a specially designed wound-healing antibody-based microarray. Methods Wound fluid from nondiabetic patients with nonhealing venous leg ulcers was compared with that from patients with healing open granulating acute wounds. The high-throughput method enabled simultaneous measurement of the relative levels of 48 different proteins representing major categories of wound-healing modulators. Results Unexpectedly, several of the examined proteins, including various proinflammatory cytokines, proteinases and antiproteinases, were not significantly (P > 0·001) changed in chronic wound fluid. For example, levels of matrix metalloproteinase-9 and one of its substrates type IV collagen were similar in the two groups. The wound fluid samples displayed similar degrees of fragmentation of fibronectin by Western blot analysis and the total fibronectin levels were doubled (P < 0·001) in chronic compared with acute wounds. The increased fibronectin originated from α-smooth muscle actin-positive myofibroblasts and not from the circulation. S100A8/A9 was the sole protein that was reduced (P < 0·001) in wound fluid from venous ulcers [median 226 μg mL -1 (interquartile range 213-278)] compared with healing wounds [455 μg mL-1 (382-504)], probably reflecting a difference in inflammatory cell composition. Conclusion The molecular anomalies in chronic wounds are more subtle than the current paradigm and neither excessive proteinase activity nor deficiencies of examined extracellular matrix proteins, growth factors or angiogenic/angiostatic factors appear to contribute significantly to the nonhealing state of venous leg ulcers.
AB - Background Knowledge on the underlying mechanisms for nonhealing chronic wounds is fragmentary. Objectives To increase our understanding of the pathogenesis, the relationship between healing ability and a large panel of proteins was studied using a specially designed wound-healing antibody-based microarray. Methods Wound fluid from nondiabetic patients with nonhealing venous leg ulcers was compared with that from patients with healing open granulating acute wounds. The high-throughput method enabled simultaneous measurement of the relative levels of 48 different proteins representing major categories of wound-healing modulators. Results Unexpectedly, several of the examined proteins, including various proinflammatory cytokines, proteinases and antiproteinases, were not significantly (P > 0·001) changed in chronic wound fluid. For example, levels of matrix metalloproteinase-9 and one of its substrates type IV collagen were similar in the two groups. The wound fluid samples displayed similar degrees of fragmentation of fibronectin by Western blot analysis and the total fibronectin levels were doubled (P < 0·001) in chronic compared with acute wounds. The increased fibronectin originated from α-smooth muscle actin-positive myofibroblasts and not from the circulation. S100A8/A9 was the sole protein that was reduced (P < 0·001) in wound fluid from venous ulcers [median 226 μg mL -1 (interquartile range 213-278)] compared with healing wounds [455 μg mL-1 (382-504)], probably reflecting a difference in inflammatory cell composition. Conclusion The molecular anomalies in chronic wounds are more subtle than the current paradigm and neither excessive proteinase activity nor deficiencies of examined extracellular matrix proteins, growth factors or angiogenic/angiostatic factors appear to contribute significantly to the nonhealing state of venous leg ulcers.
U2 - 10.1111/j.1365-2133.2011.10384.x
DO - 10.1111/j.1365-2133.2011.10384.x
M3 - Journal article
SN - 0007-0963
VL - 165
SP - 292
EP - 301
JO - British Journal of Dermatology
JF - British Journal of Dermatology
IS - 2
ER -