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From the Department of Biochemistry,* University of Washington, Seattle, Washington; and the Department of Pathology, Beth Israel and Deaconess Medical Center, Harvard Medical School, Boston, Massachusetts
Thrombospondin (TSP) 1 and 2, share the same overall structure and interact with a number of the same cell-surface receptors. In an attempt to elucidate their biological roles more clearly, we generated double-TSP1/TSP2-null animals and compared their phenotype to those of TSP1- and TSP2-null mice. Double-null mice exhibited an apparent phenotype that primarily represented the sum of the abnormalities observed in the single-null mice. However, surprisingly, the wound-healing response in double-null mice resembled that in TSP1-null animals and differed from that in TSP2-nulls. Thus, although the excisional wounds of TSP2-null mice are characterized by increased neovascularization and heal at an accelerated rate, TSP1-null and double-null animals demonstrated delayed healing, as indicated by the prolonged persistence of inflammation and delayed scab loss. Immunohistochemical analysis showed that, similar to TSP1-null mice, the granulation tissue of double-null mice was not excessively vascularized. Furthermore as in TSP1-nulls, decreases in macrophage recruitment and in the levels of monocyte chemoattractant protein-1 indicated that the inflammatory phase of the wound-healing response was impaired in double-null mice. Our data demonstrate that the consequences of a lack of TSP1 predominate in the response of double-null mice, and dictate the course of wound healing. These findings reflect distinct temporal and spatial expressions of TSP1 and TSP2 in the healing wound.
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