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Liu M, Lu F, Feng J. Aging and homeostasis of the hypodermis in the age-related deterioration of skin function. Cell Death Dis 2024; 15:443. [PMID: 38914551 PMCID: PMC11196735 DOI: 10.1038/s41419-024-06818-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2023] [Revised: 02/01/2024] [Accepted: 06/10/2024] [Indexed: 06/26/2024]
Abstract
Adipose tissues in the hypodermis, the crucial stem cell reservoir in the skin and the endocrine organ for the maintenance of skin homeostasis undergo significant changes during skin aging. Dermal white adipose tissue (dWAT) has recently been recognized as an important organ for both non-metabolic and metabolic health in skin regeneration and rejuvenation. Defective differentiation, adipogenesis, improper adipocytokine production, and immunological dissonance dysfunction in dWAT lead to age-associated clinical changes. Here, we review age-related alterations in dWAT across levels, emphasizing the mechanisms underlying the regulation of aging. We also discuss the pathogenic changes involved in age-related fat dysfunction and the unfavorable consequences of accelerated skin aging, such as chronic inflammaging, immunosenescence, delayed wound healing, and fibrosis. Research has shown that adipose aging is an early initiation event and a potential target for extending longevity. We believe that adipose tissues play an essential role in aging and form a potential therapeutic target for the treatment of age-related skin diseases. Further research is needed to improve our understanding of this phenomenon.
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Affiliation(s)
- Meiqi Liu
- Department of Plastic Surgery, Nanfang Hospital, Southern Medical University, 1838 Guangzhou North Road, Guangzhou, Guangdong, 510515, People's Republic of China
| | - Feng Lu
- Department of Plastic Surgery, Nanfang Hospital, Southern Medical University, 1838 Guangzhou North Road, Guangzhou, Guangdong, 510515, People's Republic of China
| | - Jingwei Feng
- Department of Plastic Surgery, Nanfang Hospital, Southern Medical University, 1838 Guangzhou North Road, Guangzhou, Guangdong, 510515, People's Republic of China.
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Bouchard KV, Costin GE. Promoting New Approach Methodologies (NAMs) for research on skin color changes in response to environmental stress factors: tobacco and air pollution. FRONTIERS IN TOXICOLOGY 2023; 5:1256399. [PMID: 37886123 PMCID: PMC10598764 DOI: 10.3389/ftox.2023.1256399] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2023] [Accepted: 08/25/2023] [Indexed: 10/28/2023] Open
Abstract
Aging is one of the most dynamic biological processes in the human body and is known to carry significant impacts on individuals' self-esteem. Skin pigmentation is a highly heritable trait made possible by complex, strictly controlled cellular and molecular mechanisms. Genetic, environmental and endocrine factors contribute to the modulation of melanin's amount, type and distribution in the skin layers. One of the hallmarks of extrinsic skin aging induced by environmental stress factors is the alteration of the constitutive pigmentation pattern clinically defined as senile lentigines and/or melasma or other pigmentary dyschromias. The complexity of pollutants and tobacco smoke as environmental stress factors warrants a thorough understanding of the mechanisms by which they impact skin pigmentation through repeated and long-term exposure. Pre-clinical and clinical studies demonstrated that pollutants are known to induce reactive oxygen species (ROS) or inflammatory events that lead directly or indirectly to skin hyperpigmentation. Another mechanistic direction is provided by Aryl hydrocarbon Receptors (AhR) which were shown to mediate processes leading to skin hyperpigmentation in response to pollutants by regulation of melanogenic enzymes and transcription factors involved in melanin biosynthesis pathway. In this context, we will discuss a diverse range of New Approach Methodologies (NAMs) capable to provide mechanistic insights of the cellular and molecular pathways involved in the action of environmental stress factors on skin pigmentation and to support the design of raw ingredients and formulations intended to counter their impact and of any subsequently needed clinical studies.
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Lemarchand M, Thouin K, De Serres-Bérard T, Bellenfant S, Cadau S, Berthod F. In vitro glycation of a tissue-engineered wound healing model to mimic diabetic ulcers. Biotechnol Bioeng 2023; 120:1657-1666. [PMID: 36810698 DOI: 10.1002/bit.28359] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2022] [Revised: 02/08/2023] [Accepted: 02/18/2023] [Indexed: 02/24/2023]
Abstract
Diabetic foot ulcers are a major complication of diabetes that occurs following minor trauma. Diabetes-induced hyperglycemia is a leading factor inducing ulcer formation and manifests notably through the accumulation of advanced glycation end-products (AGEs) such as N-carboxymethyl-lysin. AGEs have a negative impact on angiogenesis, innervation, and reepithelialization causing minor wounds to evolve into chronic ulcers which increases the risks of lower limb amputation. However, the impact of AGEs on wound healing is difficult to model (both in vitro on cells, and in vivo in animals) because it involves a long-term toxic effect. We have developed a tissue-engineered wound healing model made of human keratinocytes, fibroblasts, and endothelial cells cultured in a collagen sponge biomaterial. To mimic the deleterious effects induced by glycation on skin wound healing, the model was treated with 300 µM of glyoxal for 15 days to promote AGEs formation. Glyoxal treatment induced carboxymethyl-lysin accumulation and delayed wound closure in the skin mimicking diabetic ulcers. Moreover, this effect was reversed by the addition of aminoguanidine, an inhibitor of AGEs formation. This in vitro diabetic wound healing model could be a great tool for the screening of new molecules to improve the treatment of diabetic ulcers by preventing glycation.
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Affiliation(s)
- Mathias Lemarchand
- LOEX, Centre de recherche du CHU de Québec-Université Laval, Québec, Canada
| | - Kiefer Thouin
- LOEX, Centre de recherche du CHU de Québec-Université Laval, Québec, Canada
| | | | - Sabrina Bellenfant
- LOEX, Centre de recherche du CHU de Québec-Université Laval, Québec, Canada
| | - Sébastien Cadau
- LOEX, Centre de recherche du CHU de Québec-Université Laval, Québec, Canada
| | - François Berthod
- LOEX, Centre de recherche du CHU de Québec-Université Laval, Québec, Canada.,Département de Chirurgie, Faculté de Médecine, Université Laval, Québec, Canada
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UVA Exposure Combined with Glycation of the Dermis Are Two Catalysts for Skin Aging and Promotes a Favorable Environment to the Appearance of Elastosis. J Aging Res 2021; 2021:6647773. [PMID: 34737896 PMCID: PMC8563119 DOI: 10.1155/2021/6647773] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2020] [Revised: 08/23/2021] [Accepted: 10/04/2021] [Indexed: 11/18/2022] Open
Abstract
Skin aging is the result of superimposed intrinsic (individual) and extrinsic (e.g., UV exposure or nutrition) aging. Previous works have reported a relationship between UV irradiation and glycation in the aging process, leading, for example, to modified radical species production and the appearance of AGEs (advanced glycosylation end products) in increasing quantities, particularly glycoxidation products like pentosidine. In addition, the colocalization of AGEs and elastosis has also been observed. We first investigated the combination of the glycation reaction and UVA effects on a reconstructed skin model to explain their cumulative biological effect. We found that UVA exposure combined with glycation had the ability to intensify the response for specific markers: for example, MMP1 or MMP3 mRNA, proteases involved in extracellular matrix degradation, or proinflammatory cytokine, IL1α, protein expression. Moreover, the association of glycation and UVA irradiation is believed to promote an environment that favors the onset of an elastotic-like phenomenon: mRNA coding for elastin, elastase, and tropoelastin expression is increased. Secondly, because the damaging effects of UV radiation in vivo might be more detrimental in aged skin than in young skin due to increased accumulation of pentosidine and the exacerbation of alterations related to chronological aging, we studied the biological effect of soluble pentosidine in fibroblasts grown in monolayers. We found that pentosidine induced upregulation of CXCL2, IL8, and MMP12 mRNA expression (inflammatory and elastotic markers, respectively). Tropoelastin protein expression (elastin precursor) was also increased. In conclusion, fibroblasts in monolayers cultured with soluble pentosidine and tridimensional in vitro skin constructs exposed to the combination of AGEs and UVA promote an inflammatory state and an alteration of the dermal compartment in relation to an elastosis-like environment.
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Letsiou S. Tracing skin aging process: a mini- review of in vitro approaches. Biogerontology 2021; 22:261-272. [PMID: 33721158 DOI: 10.1007/s10522-021-09916-z] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2021] [Accepted: 03/04/2021] [Indexed: 12/25/2022]
Abstract
Skin is a rather complex, yet useful organ of our body. Besides, skin aging is a complicated process that gains a growing interest as mediates many molecular processes in our body. Thus, an efficient skin model is important to understand skin aging function as well as to develop an effective innovative product for skin aging treatment. In this mini review, we present in vitro methods for assessments of skin aging in an attempt to pinpoint basic molecular mechanisms behind this process achieving both a better understanding of aging function and an effective evaluation of potential products or ingredients that counteract aging. Specifically, this study presents in vitro assays such as 2D or 3D skin models, to evaluate skin aging-related processes such as skin moisturization, photoaging, wound healing, menopause, and skin microbiome as novel efforts in the designing of efficacy assessments in the development of skincare products.
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Affiliation(s)
- Sophia Letsiou
- Laboratory of Biochemistry, Research and Development Department, APIVITA S.A., Industrial Park of Markopoulo Mesogaias, Markopoulo Attiki, 19003, Athens, Greece.
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Muller Q, Berthod F, Flacher V. [Tridimensional in vitro models of nervous and immune systems in the skin]. Med Sci (Paris) 2021; 37:68-76. [PMID: 33492221 DOI: 10.1051/medsci/2020260] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
The immune system and the sensory nervous system are responsible for perceiving danger under distinct yet complementary forms. In the last few years, neuroimmune interactions have become an important topic of dermatological research for conditions including wound healing, atopic dermatitis and psoriasis. We present here a selection of tridimensional in vitro models that reproduce skin structure and integrate an immune or a sensory function. Future evolutions of such models are expected to greatly contribute in a better understanding of reciprocal influences between sensory nervous system and immune system.
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Affiliation(s)
- Quentin Muller
- Laboratoire CNRS UPR3572 / I2CT Immunologie, immunopathologie et chimie thérapeutique, Université de Strasbourg, Institut de biologie moléculaire et cellulaire, 2 allée Konrad Roentgen, 67084 Strasbourg, France - Centre LOEX de l'Université Laval ; Centre de recherche du CHU de Québec - Université Laval et Département de chirurgie, Faculté de médecine, 1401, 18e avenue, Québec, QC G1J 1Z4, Canada - Adresse actuelle : Laboratoire BIOTIS, Inserm U1026, Université de Bordeaux, Bordeaux, France
| | - François Berthod
- Centre LOEX de l'Université Laval ; Centre de recherche du CHU de Québec - Université Laval et Département de chirurgie, Faculté de médecine, 1401, 18e avenue, Québec, QC G1J 1Z4, Canada
| | - Vincent Flacher
- Laboratoire CNRS UPR3572 / I2CT Immunologie, immunopathologie et chimie thérapeutique, Université de Strasbourg, Institut de biologie moléculaire et cellulaire, 2 allée Konrad Roentgen, 67084 Strasbourg, France
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Hennies HC, Poumay Y. Skin Disease Models In Vitro and Inflammatory Mechanisms: Predictability for Drug Development. Handb Exp Pharmacol 2021; 265:187-218. [PMID: 33387068 DOI: 10.1007/164_2020_428] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/06/2023]
Abstract
Investigative skin biology, analysis of human skin diseases, and numerous clinical and pharmaceutical applications rely on skin models characterized by reproducibility and predictability. Traditionally, such models include animal models, mainly rodents, and cellular models. While animal models are highly useful in many studies, they are being replaced by human cellular models in more and more approaches amid recent technological development due to ethical considerations. The culture of keratinocytes and fibroblasts has been used in cell biology for many years. However, only the development of co-culture and three-dimensional epidermis and full-skin models have fundamentally contributed to our understanding of cell-cell interaction and cell signalling in the skin, keratinocyte adhesion and differentiation, and mechanisms of skin barrier function. The modelling of skin diseases has highlighted properties of the skin important for its integrity and cutaneous development. Examples of monogenic as well as complex diseases including atopic dermatitis and psoriasis have demonstrated the role of skin models to identify pathomechanisms and drug targets. Recent investigations have indicated that 3D skin models are well suitable for drug testing and preclinical studies of topical therapies. The analysis of skin diseases has recognized the importance of inflammatory mechanisms and immune responses and thus other cell types such as dendritic cells and T cells in the skin. Current developments include the production of more complete skin models comprising a range of different cell types. Organ models and even multi-organ systems are being developed for the analysis of higher levels of cellular interaction and drug responses and are among the most recent innovations in skin modelling. They promise improved robustness and flexibility and aim at a body-on-a-chip solution for comprehensive pharmaceutical in vitro studies.
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Affiliation(s)
- Hans Christian Hennies
- Department of Biological and Geographical Sciences, University of Huddersfield, Huddersfield, UK. .,Cologne Center for Genomics, University Hospital Cologne, Cologne, Germany.
| | - Yves Poumay
- Faculty of Medicine, Namur Research Institute for Life Sciences, University of Namur, Namur, Belgium
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Li X, Yang K, Gao S, Zhao J, Liu G, Chen Y, Lin H, Zhao W, Hu Z, Xu N. Carnosine Stimulates Macrophage-Mediated Clearance of Senescent Skin Cells Through Activation of the AKT2 Signaling Pathway by CD36 and RAGE. Front Pharmacol 2020; 11:593832. [PMID: 33390976 PMCID: PMC7772392 DOI: 10.3389/fphar.2020.593832] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2020] [Accepted: 10/30/2020] [Indexed: 01/10/2023] Open
Abstract
Background: Macrophages can selectively recognize and eliminate senescent cells, but this function is impaired with age, resulting in excessive accumulation of senescent cells in the skin, which ultimately causes skin aging. Therefore, enhancing the immune surveillance ability of macrophages to clear senescent keratinocytes and fibroblasts from aging skin may be an effective skin rejuvenation strategy. Methods: In this study, a macrophage and senescent skin cell co-culture model was established whereby THP-1-derived macrophages and tert-butyl hydroxide-induced senescent skin cells (HaCaT and HFF-1) were grown in the same culture. Senescent skin cells were detected by the SPiDER-βgal assay, and the expression of secretory phenotype factors related to senescence was assayed by qPCR. The effect of carnosine on the number of SA-β-gal positive skin cells in the macrophage-senescent skin cell co-culture was evaluated and compared with that in the senescent skin cell monoculture. Results: Carnosine promoted macrophage-mediated elimination of senescent skin cells in the co-culture. Through the AKT2 signaling pathway, carnosine upregulated the expression of CD36 and receptors for advanced glycation end products and elevated the phagocytic capacity of the macrophages, thereby promoting the ability of the macrophages to eliminate the senescent skin cells. Conclusions: Carnosine could boost the immune surveillance ability of macrophages to clear senescent keratinocytes and fibroblasts in the macrophage-senescent skin cell co-culture by activating the AKT2 signaling pathway, suggesting the possibility of using carnosine as an agent to reverse skin aging.
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Affiliation(s)
- Xuenan Li
- College of Life and Environmental Sciences, Wenzhou University, Wenzhou, China
| | - Kaiye Yang
- Infinitus (China) Company Ltd., Guangzhou, China
| | - Shuang Gao
- School of Pharmaceutical Sciences, Wenzhou Medical University, Wenzhou, China
| | - Jungang Zhao
- College of Life and Environmental Sciences, Wenzhou University, Wenzhou, China
| | | | - Yu Chen
- College of Life and Environmental Sciences, Wenzhou University, Wenzhou, China
| | - Haojie Lin
- College of Life and Environmental Sciences, Wenzhou University, Wenzhou, China
| | - Wengang Zhao
- College of Life and Environmental Sciences, Wenzhou University, Wenzhou, China
| | - Zhenlin Hu
- College of Life and Environmental Sciences, Wenzhou University, Wenzhou, China
| | - Nuo Xu
- College of Life and Environmental Sciences, Wenzhou University, Wenzhou, China
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Nakamura M, Haarmann-Stemmann T, Krutmann J, Morita A. Alternative test models for skin ageing research. Exp Dermatol 2018; 27:495-500. [DOI: 10.1111/exd.13519] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 02/19/2018] [Indexed: 12/29/2022]
Affiliation(s)
- Motoki Nakamura
- Department of Geriatric and Environmental Dermatology; Nagoya City University Graduate School of Medical Sciences; Nagoya Japan
| | | | - Jean Krutmann
- IUF-Leibniz Research Institute for Environmental Medicine; Düsseldorf Germany
- Medical Faculty; Heinrich-Heine-University; Düsseldorf Germany
| | - Akimichi Morita
- Department of Geriatric and Environmental Dermatology; Nagoya City University Graduate School of Medical Sciences; Nagoya Japan
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Contribution of In Vivo and Organotypic 3D Models to Understanding the Role of Macrophages and Neutrophils in the Pathogenesis of Psoriasis. Mediators Inflamm 2017; 2017:7215072. [PMID: 29249871 PMCID: PMC5698795 DOI: 10.1155/2017/7215072] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2017] [Revised: 09/15/2017] [Accepted: 10/02/2017] [Indexed: 02/08/2023] Open
Abstract
Psoriasis, a common chronic immune-mediated skin disease, is histologically characterized by a rapid keratinocyte turnover and differentiation defects. Key insights favor the idea that T cells are not the only key actors involved in the inflammatory process. Innate immune cells, more precisely neutrophils and macrophages, provide specific signals involved in the initiation and the maintenance of the pathogenesis. Current data from animal models and, to a lesser extent, three-dimensional in vitro models have confirmed the interest in leaning towards other immune cell types as a potential new cellular target for the treatment of the disease. Although these models do not mimic the complex phenotype nor all human features of psoriasis, their development is necessary and essential to better understand reciprocal interactions between skin cells and innate immune cells and to emphasize the crucial importance of the local lesional microenvironment. In this review, through the use of in vivo and 3D organotypic models, we aim to shed light on the crosstalk between epithelial and immune components and to discuss the role of secreted inflammatory molecules in the development of this chronic skin disease.
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