Abstract
Chronobiological oscillation was established for epidermal growth factor (r-EGF) in granular convoluted tubule (GCT) cells of the male rat submandibular gland (SMG) using immunohistochemistry. The high amplitude oscillation with a peak at 9 p.m. and low amplitude oscillation during the day time was noted. The distribution pattern of the r-EGF in the GCT segment was time-dependent, as it was seen at 3 p.m. when many cells with r-EGF staining were detectable. The higher reactivity during the activity phase of the rats may correlate with the intracellular biosynthesis of r-EGF required for cell proliferation and maintenance of ductal integrity. The chronobiological oscillation pattern of r-EGF seems to be important for the maintenance of ductal integrity and wound healing.
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