Platelet-derived growth factor-BB accelerates wound closure in a new mesentery culture model without macrophages.
Platelet-derived growth factor-BB has multiple effects in vitro and has been demonstrated to accelerate wound healing in several animal models, but its precise mechanisms of action in vivo have not been fully explained. A rat mesentery culture model was developed, and platelet-derived growth factor-BB (100 ng/ml) was added to the medium containing 2% fetal calf serum for examining its closure effects. The mesentery specimens were stained by routine hematoxylin and eosin and immunohistochemical staining for macrophages. A significant improvement in closure rate and complete closure rate was seen when platelet-derived growth factor-BB was added to the medium compared with the controls (p < 0.05). There are significantly fewer macrophages in the in vitro specimen than in the in vivo specimen. In conclusion, platelet-derived growth factor-BB can contribute to wound closure of a mesenteric defect even without macrophages, suggesting a second mechanism in which it can act directly on mesenchymal cells during wound healing. This tissue-culture model is useful for gaining further insights into growth factor interactions and wound healing.
Department of Surgery, Northwestern University Medical School, Chicago, IL 60611.
L
L
Wu
S B
SB
Kumar
B H
BH
Porras-Reyes
P H
PH
Gramates
T A
TA
Mustoe
D000818:Animals; D000077214:Becaplermin; D003470:Culture Media; D046508:Culture Techniques; D008264:Macrophages / Q000502:physiology*; D008297:Male; D008643:Mesentery / Q000293:injuries*; D010982:Platelet-Derived Growth Factor / Q000494:pharmacology*; D020574:Proto-Oncogene Proteins c-sis; D051381:Rats; D017207:Rats, Sprague-Dawley; D011994:Recombinant Proteins / Q000494:pharmacology; D014945:Wound Healing / Q000187:drug effects / Q000502:physiology*
D003470:Culture Media; D010982:Platelet-Derived Growth Factor; D020574:Proto-Oncogene Proteins c-sis; D011994:Recombinant Proteins; D000077214:Becaplermin