Concanavalin (ConA)-reactive human epidermal glycoproteins

Area of Science:

• Biochemistry
• Dermatology
• Cell Biology

Background:

• Glycoconjugates are investigated for their potential role in epidermal differentiation.
• Biochemical identification of these molecules is crucial for understanding skin biology.

Purpose of the Study:

• To identify Concanavalin A (ConA)-binding glycoproteins in human epidermis.
• To determine the association of these glycoproteins with epidermal differentiation.

Main Methods:

• Analysis of whole human epidermis, trypsinized epidermal cells, differentiated epidermal layers, and keratinocyte cultures.
• Separation of NP-40 soluble molecules by SDS-PAGE.
• Detection of glycoproteins using 125I-ConA labeling.

Main Results:

• ConA labeling revealed numerous glycoproteins in whole epidermal extracts.
• Trypsinized cells showed altered glycoprotein profiles compared to whole epidermis.
• Specific glycoproteins were enriched in the most differentiated epidermal layers.
• These glycoproteins were largely absent or poorly labeled in keratinocyte cultures.

Conclusions:

• Certain Concanavalin A-binding glycoproteins are specifically localized to differentiated epidermal layers.
• These findings suggest these glycoproteins are involved in, or serve as markers for, human epidermal differentiation.