Simvastatin enhances VEGF production and ameliorates impaired wound healing in experimental diabetes.
Statins have different effects beyond cholesterol reduction and stimulate angiogenesis. We investigated the effect of simvastatin in diabetes-related healing defects. An incisional skin wound model produced on the back of female diabetic mice (db(+)/db(+)) and their normoglycemic littermates (db(+)/(+)m) was used. Animals were treated daily either with simvastatin (5 mg/(kgi.p.)) or vehicle. Mice were killed on different days (3, 6 and 12 after skin injury) for measurement of vascular endothelial growth factor (VEGF) mRNA and protein expression, to assess histologically the healing process and to evaluate wound breaking strength and angiogenesis by CD31 immunostaining. Simvastatin administration in diabetic mice increased VEGF mRNA (simvastatin=4.8+/-0.6n-fold/beta-actin; vehicle=2.3+/-0.4n-fold/beta-actin) and protein expression (simvastatin=5+/-0.7 integrated intensity; vehicle=2.2+/-0.3 integrated intensity) and enhanced nitric oxide wound content at day 6. Additionally, the statin augmented breaking strength and PECAM-1 immunostaining at day 12. Finally, simvastatin administration restored the impaired wound healing process in diabetic mice. Similar results were obtained in normoglycaemic mice. Passive immunization with anti-VEGF antibody (10 microg/mouse) completely abrogated the beneficial effects of simvastatin on healing in diabetic mice. Simvastatin has potential application in diabetes-related wound healing disorders.
Bitto
Alessandra
A
Department of Clinical and Experimental Medicine and Pharmacology, Section of Pharmacology, University of Messina, Italy.
Minutoli
Letteria
L
Altavilla
Domenica
D
Polito
Francesca
F
Fiumara
Tiziana
T
Marini
Herbert
H
Galeano
Mariarosaria
M
Calò
Margherita
M
Lo Cascio
Patrizia
P
Bonaiuto
Michele
M
Migliorato
Alba
A
Caputi
Achille P
AP
Squadrito
Francesco
F
D000818:Animals; D000924:Anticholesteremic Agents / Q000494:pharmacology*; D003921:Diabetes Mellitus, Experimental / Q000503:physiopathology*; D004195:Disease Models, Animal; D005260:Female; D007150:Immunohistochemistry; D051379:Mice; D009569:Nitric Oxide / Q000378:metabolism; D019408:Platelet Endothelial Cell Adhesion Molecule-1 / Q000378:metabolism; D012333:RNA, Messenger / Q000096:biosynthesis; D019821:Simvastatin / Q000494:pharmacology*; D012867:Skin / Q000293:injuries*; D042461:Vascular Endothelial Growth Factor A / Q000096:biosynthesis*; D014945:Wound Healing / Q000187:drug effects*
D000924:Anticholesteremic Agents; D019408:Platelet Endothelial Cell Adhesion Molecule-1; D012333:RNA, Messenger; D042461:Vascular Endothelial Growth Factor A; D009569:Nitric Oxide; D019821:Simvastatin