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American Journal of Pathology, Vol 143, 130-142, Copyright © 1993 by American Society for Investigative Pathology

REGULAR ARTICLES

Sequential expression of transforming growth factors alpha and beta 1 by eosinophils during cutaneous wound healing in the hamster

DT Wong, RB Donoff, J Yang, BZ Song, K Matossian, N Nagura, A Elovic, J McBride, G Gallagher and R Todd
Department of Oral Medicine, Harvard School of Dental Medicine, Boston, MA 02115.

Transforming growth factor-alpha (TGF-alpha) and TGF-beta 1 have been proposed as important regulators of processes critical to successful wound healing. Although various cells present in wounds represent potential sources of either TGF-alpha and/or TGF-beta, including macrophages, neutrophils, keratinocytes, fibroblasts, and endothelial cells, we recently identified eosinophils as an additional potential source of these cytokines. We therefore used in situ hybridization and immunohistochemistry to determine whether eosinophils represent significant sources of TGF-alpha and/or TGF-beta 1 in skin wounds in the hamster. We found that these wounds developed a prominent infiltration of eosinophils, and that eosinophils were a cellular source of both TGF-alpha and TGF-beta 1 mRNAs. TGF-alpha and TGF-beta 1 proteins were detectable both within eosinophils and extracellularly. Moreover, there was a sequential pattern of TGF-alpha and TGF-beta 1 expression by infiltrating eosinophils, with the onset of eosinophil- associated TGF-alpha expression preceding that of TGF-beta 1. This sequential pattern of TGF expression suggests that eosinophils may help to regulate critical biological processes during wound healing.

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