COMPOSITION FOR SUPPRESSING DECREASE IN OR IMPROVING SKIN BARRIER FUNCTION, COMPOSITION FOR SUPPRESSING DECREASE IN OR IMPROVING EXPRESSION OF TYPE 4 COLLAGEN, AND METHOD FOR SCREENING SUBSTANCES HAVING ACTION TO SUPPRESS DECREASE IN OR IMPROVE SKIN BARRIER FUNCTION

摘要

The purpose of the present invention is to provide a composition for suppressing a decrease in or improving skin barrier function capable of suppressing a decrease in skin barrier function or improving said function, a composition for suppressing a decrease in or improving expression of type 4 collagen, a method for suppressing a decrease in skin barrier function or improving skin barrier function, a method for suppressing a decrease in expression of type 4 collagen or improving said expression, and a method for screening substances having an action to suppress a decrease in or improve skin barrier function. The present invention relates to a composition for suppressing a decrease in or improving skin barrier function via suppressing a decrease in or improving expression of type 4 collagen that includes as an active ingredient one or more extracts selected from the group consisting of extracts of plants of the genus Rosa (Rosaceae), extracts of grape seeds or pericarp, extracts of Yarrowia yeasts, extracts of plants of the genus Camellia (Theaceae), extracts of plants of the genus Filipendula (Rosaceae), and extract of plants of the genus Mentha (Labiatae).