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Brief Report

Characterization of Skin Interfollicular Stem Cells and Early Transit Amplifying Cells during the Transition from Infants to Young Children

by
Marika Quadri
1,
Caroline Baudouin
2,
Roberta Lotti
1,*,
Elisabetta Palazzo
1,
Letizia Campanini
1,
François-Xavier Bernard
3,
Gaëlle Bellemere
2,
Carlo Pincelli
1 and
Alessandra Marconi
1
1
DermoLab, Department of Surgical, Medical, Dental and Morphological Sciences, University of Modena and Reggio Emilia, 41124 Modena, Italy
2
Expanscience Laboratoires, 28230 Eprernon, France
3
Bioalternatives, 86160 Gencay, France
*
Author to whom correspondence should be addressed.
Int. J. Mol. Sci. 2024, 25(11), 5635; https://doi.org/10.3390/ijms25115635
Submission received: 25 March 2024 / Revised: 16 May 2024 / Accepted: 17 May 2024 / Published: 22 May 2024
(This article belongs to the Special Issue Editorial Board Members’ Collection Series: Stem Cells and Regenerative Medicine)
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Abstract

In the interfollicular epidermis, keratinocyte stem cells (KSC) generate a short-lived population of transit amplifying (TA) cells that undergo terminal differentiation after several cell divisions. Recently, we isolated and characterized a highly proliferative keratinocyte cell population, named “early” TA (ETA) cell, representing the first KSC progenitor with exclusive features. This work aims to evaluate epidermis, with a focus on KSC and ETA cells, during transition from infancy to childhood. Reconstructed human epidermis (RHE) generated from infant keratinocytes is more damaged by UV irradiation, as compared to RHE from young children. Moreover, the expression of several differentiation and barrier genes increases with age, while the expression of genes related to stemness is reduced from infancy to childhood. The proliferation rate of KSC and ETA cells is higher in cells derived from infants’ skin samples than of those derived from young children, as well as the capacity of forming colonies is more pronounced in KSC derived from infants than from young children’s skin samples. Finally, infants-KSC show the greatest regenerative capacity in skin equivalents, while young children ETA cells express higher levels of differentiation markers, as compared to infants-ETA. KSC and ETA cells undergo substantial changes during transition from infancy to childhood. The study presents a novel insight into pediatric skin, and sheds light on the correlation between age and structural maturation of the skin.
Keywords: skin barrier; keratinocyte stem cells (KSC); early transit amplifying (ETA) cells; neonatal skin; pediatric skin skin barrier; keratinocyte stem cells (KSC); early transit amplifying (ETA) cells; neonatal skin; pediatric skin

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MDPI and ACS Style

Quadri, M.; Baudouin, C.; Lotti, R.; Palazzo, E.; Campanini, L.; Bernard, F.-X.; Bellemere, G.; Pincelli, C.; Marconi, A. Characterization of Skin Interfollicular Stem Cells and Early Transit Amplifying Cells during the Transition from Infants to Young Children. Int. J. Mol. Sci. 2024, 25, 5635. https://doi.org/10.3390/ijms25115635

AMA Style

Quadri M, Baudouin C, Lotti R, Palazzo E, Campanini L, Bernard F-X, Bellemere G, Pincelli C, Marconi A. Characterization of Skin Interfollicular Stem Cells and Early Transit Amplifying Cells during the Transition from Infants to Young Children. International Journal of Molecular Sciences. 2024; 25(11):5635. https://doi.org/10.3390/ijms25115635

Chicago/Turabian Style

Quadri, Marika, Caroline Baudouin, Roberta Lotti, Elisabetta Palazzo, Letizia Campanini, François-Xavier Bernard, Gaëlle Bellemere, Carlo Pincelli, and Alessandra Marconi. 2024. "Characterization of Skin Interfollicular Stem Cells and Early Transit Amplifying Cells during the Transition from Infants to Young Children" International Journal of Molecular Sciences 25, no. 11: 5635. https://doi.org/10.3390/ijms25115635

APA Style

Quadri, M., Baudouin, C., Lotti, R., Palazzo, E., Campanini, L., Bernard, F.-X., Bellemere, G., Pincelli, C., & Marconi, A. (2024). Characterization of Skin Interfollicular Stem Cells and Early Transit Amplifying Cells during the Transition from Infants to Young Children. International Journal of Molecular Sciences, 25(11), 5635. https://doi.org/10.3390/ijms25115635

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