Mouse epidermal growth factor: light and electron microscopical localisation by immunocytochemical staining

Area of Science:

• Cell Biology
• Histology
• Endocrinology

Background:

• Epidermal Growth Factor (EGF) plays crucial roles in cell growth and differentiation.
• The submaxillary gland is a known site for EGF production.
• Previous localization methods for EGF had limitations in resolution.

Purpose of the Study:

• To precisely localize Epidermal Growth Factor (EGF) within the submaxillary glands of mice.
• To investigate the influence of sex and reproductive status on EGF levels.
• To evaluate advanced microscopy techniques for EGF identification.

Main Methods:

• Immunostaining techniques were employed for light microscopy.
• Freeze-drying and formaldehyde vapor fixation were utilized for enhanced sample preparation.
• Electron immunocytochemistry with the unlabelled antibody enzyme method was performed.

Main Results:

• Epidermal Growth Factor (EGF) was localized to granules in the convoluted duct cells of mouse submaxillary glands.
• Improved fixation and freeze-drying techniques yielded sharper light microscopic localization.
• EGF levels were higher in male mice compared to females, with pregnant females showing levels similar to males.
• EGF levels decreased during lactation over three weeks.

Conclusions:

• Advanced microscopy techniques provide enhanced resolution for EGF localization in submaxillary glands.
• Sex and reproductive state significantly modulate EGF levels in mouse submaxillary glands.
• The findings suggest potential applications of these methods for localizing the human counterpart, Urogastrone.