Abstract
We measured lung hyaluronidase activity in rats during postnatal life and during the repair of oxygen-induced lung injury. Hyaluronidase activity increased rapidly after birth and peaked at 16-fold the initial value at 8 days. The peak preceded decreased cell proliferation and the onset of differentiation; this is consistent with current concepts of the role of hyaluronidase. During the repair of lung injury, hyaluronidase activity increased to 2.5-fold the control value at 1 day post-injury, but had decreased by 3 days. This early peak is probably related to simultaneous cell proliferation and differentiation. We postulate that changes in hyaluronidase can influence lung growth and repair and that the system may be amenable to manipulation.
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