Related Experiment Video
Updated: Oct 7, 2025

Isolation of Papillary and Reticular Fibroblasts from Human Skin by Fluorescence-activated Cell Sorting
Published on: May 7, 2019
[Changes in the number of p23-positive fibroblasts in human dermis with aging.]
1Chuvash State University, 15 Moscovskiy pr., Cheboksary 428015, Russian Federation,
Abstract:
The aim of this work was to examine the content of p23 in fibroblasts of human dermis from 20 weeks of pregnancy until 85 years old, and defining of a role of p23 in age-dependent changes in the number and proliferation of fibroblasts in the dermis. p23, proliferating cells nuclear antigen (PCNA), fibroblasts marker vimentin were detected with indirect immunohistochemical technique. Results showed that portion of fibroblasts with positive staining for p23 in the dermis is gradually increased from 20 weeks of pregnancy until 85 years old. Age-related increase in a portion of fibroblasts with positive staining for p23 is significantly correlated with an age-related decrease in total number and percent of PCNA positive fibroblasts in human dermis. Age-related increase in the content of p23 in fibroblasts is involved in an age-dependent decrease in their total number and proliferation in the dermis.
Related Concept Videos
The Effect of Aging on Tissues
Introduction to Fibroblasts
Multipotency and Niche of Bulge Stem Cell
Renewal of Skin Epidermal Stem Cells
Papillary Dermis
The dermis might be considered the "core" of the integumentary system, as distinct from the epidermis and hypodermis. It contains blood and lymph vessels, nerves, and other structures, such as hair follicles and sweat glands. The dermis is made of two layers of connective tissue that comprise an interconnected mesh of elastin and collagenous fibers, produced by fibroblasts.
Papillary Layer
The papillary layer is made of loose, areolar connective tissue, which means the collagen...
Reticular Dermis
Reticular Layer
Underlying the papillary layer is the much thicker reticular layer, composed of dense, irregular connective...

