1
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Zhang Y, He J, Xie F, Shan S, Qin J, Wang C, Li Q, Xie Y, Fang B. Spatial transcriptomic analysis deciphers adipocyte-to-fibroblast transformation in bleomycin-induced murine skin fibrosis. Chin Med J (Engl) 2024:00029330-990000000-01264. [PMID: 39345020 DOI: 10.1097/cm9.0000000000003219] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2024] [Indexed: 10/01/2024] Open
Abstract
BACKGROUND Scleroderma is characterized by inflammation and fibrosis, predominantly occurring in the skin and extending to various parts of the body. The pathophysiology of scleroderma is multifaceted, with the current understanding including endothelial damage, inflammatory cell infiltration, and fibroblast activation in its progression. Nonetheless, the mechanism of cellular interactions and the precise spatial distribution of these cellular events within the fibrotic tissues remain elusive, highlighting a critical gap in our comprehensive understanding of scleroderma's pathogenesis. METHODS In this study, we administered bleomycin intradermally to the dorsal skin of four individual murine models. Subsequently, skin tissues were harvested at predetermined intervals for comprehensive spatial transcriptomic analysis to determine the spatial dynamics influencing scleroderma pathogenesis. To validate the possible results from bioinformatic analysis, further in vitro and in vivo experiments were conducted. RESULTS Analysis of the spatial transcriptome revealed significant alterations in cell clusters during the progression of scleroderma. Gene Ontology analysis identified disruptions in lipid metabolism as the disease advanced. Pseudotime analysis provided evidence for a phenotypic transition from adipocytes to fibroblasts. In vitro studies demonstrated increased expression of Col1a1 and α-SMA as the disease progressed. These fibroblasts have been identified as key contributors to the increasing inflammation. Co-culturing TGF-β induced adipocytes with RAW264.7 cells resulted in overexpression of pro-inflammatory cytokines in the RAW264.7 cells. Both in vitro and in vivo experiments confirmed adipocyte loss and fibroblast formation, with transformed fibroblasts showing pronounced pro-inflammatory characteristics, highlighting their crucial role in the disease mechanism. CONCLUSIONS Our study showed the spatial distribution and dynamic alterations of various cell types during scleroderma progression. Crucially, we identified the transformation of adipocytes into fibroblasts as a key factor promoting disease advancement. These emergent fibroblasts intensify inflammation, indicating that research on these cell clusters could reveal key scleroderma mechanisms and guide future therapies.
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Affiliation(s)
- Yixiang Zhang
- Department of Plastic & Reconstructive Surgery, Shanghai Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai 200011, China
| | - Jiahao He
- Shanghai Institute for Plastic and Reconstructive Surgery, Shanghai, China. Department of Plastic & Reconstructive Surgery, Shanghai Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai 200011, China
| | - Fangzhou Xie
- Department of Plastic & Reconstructive Surgery, Shanghai Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai 200011, China
| | - Shengzhou Shan
- Department of Plastic & Reconstructive Surgery, Shanghai Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai 200011, China
| | - Jiaqi Qin
- Department of Plastic & Reconstructive Surgery, Shanghai Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai 200011, China
| | - Chuandong Wang
- Department of Orthopedic Surgery, Xinhua Hospital Affiliated to Shanghai Jiao Tong University School of Medicine (SJTUSM), Shanghai 200092, China
| | - Qingfeng Li
- Department of Plastic & Reconstructive Surgery, Shanghai Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai 200011, China
| | - Yun Xie
- Shanghai Institute for Plastic and Reconstructive Surgery, Shanghai, China. Department of Plastic & Reconstructive Surgery, Shanghai Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai 200011, China
| | - Bin Fang
- Department of Plastic & Reconstructive Surgery, Shanghai Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai 200011, China
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2
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Xue M, Liao Y, Jiang W. Insights into the molecular changes of adipocyte dedifferentiation and its future research opportunities. J Lipid Res 2024:100644. [PMID: 39303983 DOI: 10.1016/j.jlr.2024.100644] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2024] [Revised: 08/23/2024] [Accepted: 09/14/2024] [Indexed: 09/22/2024] Open
Abstract
Recent studies have challenged the traditional belief that mature fat cells are irreversibly differentiated and revealed they can dedifferentiate into fibroblast-like cells known as dedifferentiated fat (DFAT) cells. Resembling pluripotent stem cells, DFAT cells hold great potential as a cell source for stem cell therapy. However, there is limited understanding of the specific changes that occur following adipocyte dedifferentiation and the detailed regulation of this process. This review explores the epigenetic, genetic, and phenotypic alterations associated with DFAT cell dedifferentiation, identifies potential targets for clinical regulation and discusses the current applications and challenges in the field of DFAT cell research.
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Affiliation(s)
- Mingheng Xue
- Department of Plastic and Cosmetic Surgery, Nanfang Hospital, Southern Medical University, 1838 Guangzhou North Road, Guangzhou, Guangdong, 510515, China
| | - Yunjun Liao
- Department of Plastic and Cosmetic Surgery, Nanfang Hospital, Southern Medical University, 1838 Guangzhou North Road, Guangzhou, Guangdong, 510515, China.
| | - Wenqing Jiang
- Department of Plastic and Cosmetic Surgery, Nanfang Hospital, Southern Medical University, 1838 Guangzhou North Road, Guangzhou, Guangdong, 510515, China.
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3
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Wareing N, Mills TW, Collum S, Wu M, Revercomb L, Girard R, Lyons M, Skaug B, Bi W, Ali MA, Koochak H, Flores AR, Yang Y, Zheng WJ, Swindell WR, Assassi S, Karmouty-Quintana H. Deletion of adipocyte Sine Oculis Homeobox Homolog 1 prevents lipolysis and attenuates skin fibrosis. BIORXIV : THE PREPRINT SERVER FOR BIOLOGY 2024:2024.05.22.595271. [PMID: 38826482 PMCID: PMC11142148 DOI: 10.1101/2024.05.22.595271] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2024]
Abstract
Dermal fibrosis is a cardinal feature of systemic sclerosis (SSc) for which there are limited treatment strategies. This is in part due to our fragmented understanding of how dermal white adipose tissue (DWAT) contributes to skin fibrosis. We identified elevated sine oculis homeobox homolog 1 (SIX1) expression in SSc skin samples from the GENISOS and PRESS cohorts, the expression of which correlated with adipose-associated genes and molecular pathways. SIX1 localization studies identified increased signals in the DWAT area in SSc and in experimental models of skin fibrosis. Global and adipocyte specific Six1 deletion abrogated end-stage fibrotic gene expression and dermal adipocyte shrinkage induced by SQ bleomycin treatment. Further studies revealed a link between elevated SIX1 and increased expression of SERPINE1 and its protein PAI-1 which are known pro-fibrotic mediators. However, SIX1 deletion did not appear to affect cellular trans differentiation. Taken together these results point at SIX1 as a potential target for dermal fibrosis in SSc.
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Affiliation(s)
- Nancy Wareing
- Department of Biochemistry and Molecular Biology, McGovern Medical School, University of Texas Health Science Center at Houston (UTHealth Houston), TX, USA
- Division of Rheumatology, Department of Internal Medicine, McGovern Medical School, UTHealth Houston, Houston TX, USA
| | - Tingting W Mills
- Department of Biochemistry and Molecular Biology, McGovern Medical School, University of Texas Health Science Center at Houston (UTHealth Houston), TX, USA
| | - Scott Collum
- Department of Biochemistry and Molecular Biology, McGovern Medical School, University of Texas Health Science Center at Houston (UTHealth Houston), TX, USA
| | - Minghua Wu
- Division of Rheumatology, Department of Internal Medicine, McGovern Medical School, UTHealth Houston, Houston TX, USA
| | | | - Rene Girard
- Department of Biochemistry and Molecular Biology, McGovern Medical School, University of Texas Health Science Center at Houston (UTHealth Houston), TX, USA
| | - Marka Lyons
- Division of Rheumatology, Department of Internal Medicine, McGovern Medical School, UTHealth Houston, Houston TX, USA
| | - Brian Skaug
- Division of Rheumatology, Department of Internal Medicine, McGovern Medical School, UTHealth Houston, Houston TX, USA
| | - Weizhen Bi
- Department of Biochemistry and Molecular Biology, McGovern Medical School, University of Texas Health Science Center at Houston (UTHealth Houston), TX, USA
| | - Meer A. Ali
- D Bradley McWilliams School of Biomedical Informatics, Department of Internal Medicine, McGovern Medical School, UTHealth Houston, Houston TX, USA
| | - Haniyeh Koochak
- Department of Pediatrics, McGovern Medical School, UTHealth Houston, Houston TX, USA
| | - Anthony R Flores
- Department of Pediatrics, McGovern Medical School, UTHealth Houston, Houston TX, USA
| | - Yuntao Yang
- D Bradley McWilliams School of Biomedical Informatics, Department of Internal Medicine, McGovern Medical School, UTHealth Houston, Houston TX, USA
| | - W Jim Zheng
- D Bradley McWilliams School of Biomedical Informatics, Department of Internal Medicine, McGovern Medical School, UTHealth Houston, Houston TX, USA
| | - William R Swindell
- Department of Internal Medicine, University of Texas Southwestern Medical Center, Dallas, TX
| | - Shervin Assassi
- Division of Rheumatology, Department of Internal Medicine, McGovern Medical School, UTHealth Houston, Houston TX, USA
| | - Harry Karmouty-Quintana
- Department of Biochemistry and Molecular Biology, McGovern Medical School, University of Texas Health Science Center at Houston (UTHealth Houston), TX, USA
- Divisions of Critical Care, Pulmonary and Sleep Medicine, Department of Internal Medicine, McGovern Medical School, UTHealth Houston, Houston TX, USA
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4
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Bose GS, Kalakoti G, Kulkarni AP, Mittal S. AP-1/C-FOS and AP-1/FRA2 differentially regulate early and late adipogenic differentiation of mesenchymal stem cells. J Cell Biochem 2024. [PMID: 38440920 DOI: 10.1002/jcb.30543] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2023] [Revised: 02/01/2024] [Accepted: 02/15/2024] [Indexed: 03/06/2024]
Abstract
Obesity is defined as an abnormal accumulation of adipose tissue in the body and is a major global health problem due to increased morbidity and mortality. Adipose tissue is made up of adipocytes, which are fat-storing cells, and the differentiation of these fat cells is known as adipogenesis. Several transcription factors (TFs) such as CEBPβ, CEBPα, PPARγ, GATA, and KLF have been reported to play a key role in adipogenesis. In this study, we report one more TF AP-1, which is found to be involved in adipogenesis. Human mesenchymal stem cells were differentiated into adipocytes, and the expression pattern of different subunits of AP-1 was examined during adipogenesis. It was observed that C-FOS was predominantly expressed at an early stage (Day 2), whereas FRA2 expression peaked at later stages (Days 6 and 8) of adipogenesis. Chromatin immunoprecipitation-sequencing analysis revealed that C-FOS binds mainly to the promoters of WNT1, miR-30a, and ANAPC7 and regulates their expression during mitotic clonal expansion. In contrast, FRA2 binds to the promoters of CIDEA, NOTCH1, ARAF, and MYLK, regulating their expression and lipid metabolism. Data obtained clearly indicate that the differential expression of C-FOS and FRA2 is crucial for different stages of adipogenesis. This also raises the possibility of considering AP-1 as a therapeutic target for treating obesity and related disorders.
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Affiliation(s)
- Ganesh Suraj Bose
- Department of Biotechnology, Savitribai Phule Pune University, Pune, India
| | - Garima Kalakoti
- Bioinformatics Center, Savitribai Phule Pune University, Pune, India
| | | | - Smriti Mittal
- Department of Biotechnology, Savitribai Phule Pune University, Pune, India
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5
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Jussila A, Zhang B, Kirti S, Atit R. Tissue fibrosis associated depletion of lipid-filled cells. Exp Dermatol 2024; 33:e15054. [PMID: 38519432 PMCID: PMC10977660 DOI: 10.1111/exd.15054] [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: 10/03/2023] [Revised: 02/06/2024] [Accepted: 02/29/2024] [Indexed: 03/24/2024]
Abstract
Fibrosis is primarily described as the deposition of excessive extracellular matrix, but in many tissues it also involves a loss of lipid or lipid-filled cells. Lipid-filled cells are critical to tissue function and integrity in many tissues including the skin and lungs. Thus, loss or depletion of lipid-filled cells during fibrogenesis, has implications for tissue function. In some contexts, lipid-filled cells can impact ECM composition and stability, highlighting their importance in fibrotic transformation. Recent papers in fibrosis address this newly recognized fibrotic lipodystrophy phenomenon. Even in disparate tissues, common mechanisms are emerging to explain fibrotic lipodystrophy. These findings have implications for fibrosis in tissues composed of fibroblast and lipid-filled cell populations such as skin, lung, and liver. In this review, we will discuss the roles of lipid-containing cells, their reduction/loss during fibrotic transformation, and the mechanisms of that loss in the skin and lungs.
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Affiliation(s)
- Anna Jussila
- Department of Biology, College of Arts and Sciences, Case Western Reserve University, Cleveland, Ohio, USA
| | - Brian Zhang
- Department of Biology, College of Arts and Sciences, Case Western Reserve University, Cleveland, Ohio, USA
| | - Sakin Kirti
- Department of Biology, College of Arts and Sciences, Case Western Reserve University, Cleveland, Ohio, USA
| | - Radhika Atit
- Department of Biology, College of Arts and Sciences, Case Western Reserve University, Cleveland, Ohio, USA
- Department of Genetics and Genome Sciences, School of Medicine, Case Western Reserve University, Cleveland, Ohio, USA
- Department of Dermatology, School of Medicine, Case Western Reserve University, Cleveland, Ohio, USA
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6
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Hajialiasgary Najafabadi A, Soheilifar MH, Masoudi-Khoram N. Exosomes in skin photoaging: biological functions and therapeutic opportunity. Cell Commun Signal 2024; 22:32. [PMID: 38217034 PMCID: PMC10785444 DOI: 10.1186/s12964-023-01451-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2023] [Accepted: 12/19/2023] [Indexed: 01/14/2024] Open
Abstract
Exosomes are tiny extracellular vesicles secreted by most cell types, which are filled with proteins, lipids, and nucleic acids (non-coding RNAs, mRNA, DNA), can be released by donor cells to subsequently modulate the function of recipient cells. Skin photoaging is the premature aging of the skin structures over time due to repeated exposure to ultraviolet (UV) which is evidenced by dyspigmentation, telangiectasias, roughness, rhytides, elastosis, and precancerous changes. Exosomes are associated with aging-related processes including, oxidative stress, inflammation, and senescence. Anti-aging features of exosomes have been implicated in various in vitro and pre-clinical studies. Stem cell-derived exosomes can restore skin physiological function and regenerate or rejuvenate damaged skin tissue through various mechanisms such as decreased expression of matrix metalloproteinase (MMP), increased collagen and elastin production, and modulation of intracellular signaling pathways as well as, intercellular communication. All these evidences are promising for the therapeutic potential of exosomes in skin photoaging. This review aims to investigate the molecular mechanisms and the effects of exosomes in photoaging.
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Affiliation(s)
- Amirhossein Hajialiasgary Najafabadi
- Department of Quantitative and Computational Biology, Max Planck Institute for Multidisciplinary Sciences, 37077, Goettingen, Germany
- Department of Pathology, Research Group Translational Epigenetics, University of Goettingen, 37075, Goettingen, Germany
| | | | - Nastaran Masoudi-Khoram
- Endocrine Research Center, Institute of Endocrinology and Metabolism, Iran University of Medical Sciences, Tehran, Iran
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7
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Jimenez SA, Piera-Velazquez S. Cellular Transdifferentiation: A Crucial Mechanism of Fibrosis in Systemic Sclerosis. Curr Rheumatol Rev 2024; 20:388-404. [PMID: 37921216 DOI: 10.2174/0115733971261932231025045400] [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: 05/12/2023] [Revised: 07/13/2023] [Accepted: 07/27/2023] [Indexed: 11/04/2023]
Abstract
Systemic Sclerosis (SSc) is a systemic autoimmune disease of unknown etiology with a highly complex pathogenesis that despite extensive investigation is not completely understood. The clinical and pathologic manifestations of the disease result from three distinct processes: 1) Severe and frequently progressive tissue fibrosis causing exaggerated and deleterious accumulation of interstitial collagens and other extracellular matrix molecules in the skin and various internal organs; 2) extensive fibroproliferative vascular lesions affecting small arteries and arterioles causing tissue ischemic alterations; and 3) cellular and humoral immunity abnormalities with the production of numerous autoantibodies, some with very high specificity for SSc. The fibrotic process in SSc is one of the main causes of disability and high mortality of the disease. Owing to its essentially universal presence and the severity of its clinical effects, the mechanisms involved in the development and progression of tissue fibrosis have been extensively investigated, however, despite intensive investigation, the precise molecular mechanisms have not been fully elucidated. Several recent studies have suggested that cellular transdifferentiation resulting in the phenotypic conversion of various cell types into activated myofibroblasts may be one important mechanism. Here, we review the potential role that cellular transdifferentiation may play in the development of severe and often progressive tissue fibrosis in SSc.
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Affiliation(s)
- Sergio A Jimenez
- Department of Dermatology and Cutaneous Biology, Jefferson Institute of Molecular Medicine and Scleroderma Center, Thomas Jefferson University, Philadelphia 19107, USA
| | - Sonsoles Piera-Velazquez
- Department of Dermatology and Cutaneous Biology, Jefferson Institute of Molecular Medicine and Scleroderma Center, Thomas Jefferson University, Philadelphia 19107, USA
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8
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Liu M, Lu F, Feng J. Therapeutic potential of adipose tissue derivatives in skin photoaging. Regen Med 2023; 18:869-883. [PMID: 37743749 DOI: 10.2217/rme-2023-0098] [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] [Indexed: 09/26/2023] Open
Abstract
Photoaging, the primary cause of exogenous skin aging and predominantly caused by ultraviolet radiation, is an essential type of skin aging characterized by chronic skin inflammation. Recent studies have shown that oxidative stress, inflammation, skin barrier homeostasis, collagen denaturation and pigmentation are the main contributors to it. As a composite tissue rich in matrix and vascular components, adipose tissue derivatives have been recently gaining attention as potential therapeutic agents for various human diseases with fat-processing technology upgrades. This review analyzes both 'minimally treated' and 'nonminimally treated' fat derivatives to give an overview of the preclinical and clinical relevance of adipose tissue derivatives for antiphotoaging application, highlighting their good clinical prospects as well as discussing their safety and potential risks.
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Affiliation(s)
- Meiqi Liu
- Department of Plastic & Cosmetic Surgery, Nanfang Hospital, Southern Medical University, 1838 Guangzhou North Road, Guangzhou, Guangdong 510515, PR China
| | - Feng Lu
- Department of Plastic & Cosmetic Surgery, Nanfang Hospital, Southern Medical University, 1838 Guangzhou North Road, Guangzhou, Guangdong 510515, PR China
| | - Jingwei Feng
- Department of Plastic & Cosmetic Surgery, Nanfang Hospital, Southern Medical University, 1838 Guangzhou North Road, Guangzhou, Guangdong 510515, PR China
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9
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Salminen A. The role of immunosuppressive myofibroblasts in the aging process and age-related diseases. J Mol Med (Berl) 2023; 101:1169-1189. [PMID: 37606688 PMCID: PMC10560181 DOI: 10.1007/s00109-023-02360-1] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2023] [Revised: 08/09/2023] [Accepted: 08/14/2023] [Indexed: 08/23/2023]
Abstract
Tissue-resident fibroblasts are mesenchymal cells which control the structural integrity of the extracellular matrix (ECM). Fibroblasts possess a remarkable plasticity to allow them to adapt to the changes in the microenvironment and thus maintain tissue homeostasis. Several stresses, also those associated with the aging process, convert quiescent fibroblasts into myofibroblasts which not only display fibrogenic properties but also act as immune regulators cooperating both with tissue-resident immune cells and those immune cells recruited into affected tissues. TGF-β cytokine and reactive oxygen species (ROS) are major inducers of myofibroblast differentiation in pathological conditions either from quiescent fibroblasts or via transdifferentiation from certain other cell types, e.g., macrophages, adipocytes, pericytes, and endothelial cells. Intriguingly, TGF-β and ROS are also important signaling mediators between immunosuppressive cells, such as MDSCs, Tregs, and M2 macrophages. It seems that in pathological states, myofibroblasts are able to interact with the immunosuppressive network. There is clear evidence that a low-grade chronic inflammatory state in aging tissues is counteracted by activation of compensatory immunosuppression. Interestingly, common enhancers of the aging process, such as oxidative stress, loss of DNA integrity, and inflammatory insults, are inducers of myofibroblasts, whereas anti-aging treatments with metformin and rapamycin suppress the differentiation of myofibroblasts and thus prevent age-related tissue fibrosis. I will examine the reciprocal interactions between myofibroblasts and immunosuppressive cells within aging tissues. It seems that the differentiation of myofibroblasts with age-related harmful stresses enhances the activity of the immunosuppressive network which promotes tissue fibrosis and degeneration in elderly individuals.
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Affiliation(s)
- Antero Salminen
- Department of Neurology, Institute of Clinical Medicine, University of Eastern Finland, P.O. Box 1627, 70211, Kuopio, Finland.
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10
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Walendzik K, Kopcewicz M, Wiśniewska J, Opyd P, Machcińska-Zielińska S, Gawrońska-Kozak B. Dermal white adipose tissue development and metabolism: The role of transcription factor Foxn1. FASEB J 2023; 37:e23171. [PMID: 37682531 DOI: 10.1096/fj.202300873rr] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2023] [Revised: 08/10/2023] [Accepted: 08/18/2023] [Indexed: 09/09/2023]
Abstract
Intradermal adipocytes form dermal white adipose tissue (dWAT), a unique fat depot localized in the lower layer of the dermis. However, recognition of molecular factors regulating dWAT development, homeostasis, and bioactivity is limited. Using Foxn1-/- and Foxn1+/+ mice, we demonstrated that epidermally expressed Foxn1 regulates dWAT development and defines the adipogenic capacity of dermal fibroblasts. In intact and post-wounded skin, Foxn1 contributes to the initial stimulation of dWAT adipogenesis and participates in the modulation of lipid metabolism processes. Furthermore, Foxn1 activity strengthens adipogenic processes through Bmp2 and Igf2 signaling and regulates lipid metabolism in differentiated dermal fibroblasts. The results reveal the contribution of Foxn1 to dWAT metabolism, thus identifying possible targets for modulation and regulation of dWAT in physiological and pathological processes in the skin.
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Affiliation(s)
- Katarzyna Walendzik
- Biological Function of Food, Institute of Animal Reproduction and Food Research, Polish Academy of Sciences, Olsztyn, Poland
| | - Marta Kopcewicz
- Biological Function of Food, Institute of Animal Reproduction and Food Research, Polish Academy of Sciences, Olsztyn, Poland
| | - Joanna Wiśniewska
- Biological Function of Food, Institute of Animal Reproduction and Food Research, Polish Academy of Sciences, Olsztyn, Poland
| | - Paulina Opyd
- Department of Animal Nutrition and Feed Science, University of Warmia and Mazury in Olsztyn, Olsztyn, Poland
| | - Sylwia Machcińska-Zielińska
- Biological Function of Food, Institute of Animal Reproduction and Food Research, Polish Academy of Sciences, Olsztyn, Poland
| | - Barbara Gawrońska-Kozak
- Biological Function of Food, Institute of Animal Reproduction and Food Research, Polish Academy of Sciences, Olsztyn, Poland
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11
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Ko J, Noviani M, Chellamuthu VR, Albani S, Low AHL. The Pathogenesis of Systemic Sclerosis: The Origin of Fibrosis and Interlink with Vasculopathy and Autoimmunity. Int J Mol Sci 2023; 24:14287. [PMID: 37762589 PMCID: PMC10532389 DOI: 10.3390/ijms241814287] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2023] [Revised: 09/05/2023] [Accepted: 09/13/2023] [Indexed: 09/29/2023] Open
Abstract
Systemic sclerosis (SSc) is an autoimmune disease associated with increased mortality and poor morbidity, impairing the quality of life in patients. Whilst we know that SSc affects multiple organs via vasculopathy, inflammation, and fibrosis, its exact pathophysiology remains elusive. Microvascular injury and vasculopathy are the initial pathological features of the disease. Clinically, the vasculopathy in SSc is manifested as Raynaud's phenomenon (reversible vasospasm in reaction to the cold or emotional stress) and digital ulcers due to ischemic injury. There are several reports that medications for vasculopathy, such as bosentan and soluble guanylate cyclase (sGC) modulators, improve not only vasculopathy but also dermal fibrosis, suggesting that vasculopathy is important in SSc. Although vasculopathy is an important initial step of the pathogenesis for SSc, it is still unclear how vasculopathy is related to inflammation and fibrosis. In this review, we focused on the clinical evidence for vasculopathy, the major cellular players for the pathogenesis, including pericytes, adipocytes, endothelial cells (ECs), and myofibroblasts, and their signaling pathway to elucidate the relationship among vasculopathy, inflammation, and fibrosis in SSc.
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Affiliation(s)
- Junsuk Ko
- Duke-National University of Singapore Medical School, Singapore 169857, Singapore; (J.K.); (M.N.); (S.A.)
| | - Maria Noviani
- Duke-National University of Singapore Medical School, Singapore 169857, Singapore; (J.K.); (M.N.); (S.A.)
- Department of Rheumatology and Immunology, Singapore General Hospital, Singapore 169608, Singapore
- Translational Immunology Institute, SingHealth Duke-National University of Singapore Academic Medical Centre, Singapore 169856, Singapore;
| | - Vasuki Ranjani Chellamuthu
- Translational Immunology Institute, SingHealth Duke-National University of Singapore Academic Medical Centre, Singapore 169856, Singapore;
| | - Salvatore Albani
- Duke-National University of Singapore Medical School, Singapore 169857, Singapore; (J.K.); (M.N.); (S.A.)
- Translational Immunology Institute, SingHealth Duke-National University of Singapore Academic Medical Centre, Singapore 169856, Singapore;
| | - Andrea Hsiu Ling Low
- Duke-National University of Singapore Medical School, Singapore 169857, Singapore; (J.K.); (M.N.); (S.A.)
- Department of Rheumatology and Immunology, Singapore General Hospital, Singapore 169608, Singapore
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12
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Zhu M, Li H, Yin Y, Ding M, Philips CA, Romeiro FG, Qi X. U-shaped relationship between subcutaneous adipose tissue index and mortality in liver cirrhosis. J Cachexia Sarcopenia Muscle 2023; 14:508-516. [PMID: 36577511 PMCID: PMC9891908 DOI: 10.1002/jcsm.13154] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/15/2022] [Revised: 08/03/2022] [Accepted: 11/29/2022] [Indexed: 12/30/2022] Open
Abstract
BACKGROUND Subcutaneous and visceral adipose tissues are important body components, but their effects on the mortality in patients with liver cirrhosis remain controversial based on the current evidence. METHODS We retrospectively identified 372 eligible patients in whom subcutaneous adipose tissue index (SATI) and visceral adipose tissue index (VATI) could be measured by computed tomography images at the third lumbar vertebra. The association of SATI and VATI with the risk of death was evaluated on a continuous scale with restricted cubic spline curves based on Cox proportional hazards models. Cumulative probability of mortality was estimated by Nelson-Aalen cumulative risk curve analyses. Independent predictors of death were evaluated by competing risk analyses after adjusting for age, sex, and model for end-stage liver disease score. RESULTS Majority of patients were male (69.4%) with a mean age of 55.40 ± 10.68 years. SATI had a U-shaped association with mortality (P for non-linearity <0.001). Cutoff values of SATI were 19.7 and 51.8 cm2 /m2 at the points where hazard ratios were just <1.2. SATI was categorized as low (<19.7 cm2 /m2 ), moderate (19.7-51.8 cm2 /m2 ), and high (>51.8 cm2 /m2 ) level. There was no significant difference in the cumulative probability of mortality between low versus moderate SATI groups (Gray's test, P = 0.052) and high versus moderate SATI groups (Gray's test, P = 0.054). Competing risk analyses demonstrated that low SATI could increase the mortality compared with moderate SATI (subdistribution hazard ratio [sHR] = 1.66, 95% confidence interval [CI]: 0.992-2.78, P = 0.054) and was an independent predictor of death (sHR = 1.86, 95% CI: 1.059-3.28, P = 0.031). Competing risk analyses also demonstrated that high SATI could significantly increase the mortality compared with moderate SATI (sHR = 1.6, 95% CI: 1-2.54, P = 0.049), and was an independent predictor of death (sHR = 2.007, 95% CI: 1.195-3.37, P = 0.0085). VATI had an irregularly shaped association with mortality (P for non-linearity <0.001). Cutoff values of VATI were 9.8 and 40.2 cm2 /m2 at the points where hazard ratios were just <1.2. VATI was categorized as low (<9.8 cm2 /m2 ), moderate (9.8-40.2 cm2 /m2 ), and high (>40.2 cm2 /m2 ) level. There was no significant difference in the cumulative probability of mortality between low versus moderate VATI groups (Gray's test, P = 0.381) and high versus moderate VATI groups (Gray's test, P = 0.787). Competing risk analyses demonstrated that neither low (sHR = 1.27, 95% CI: 0.599-2.7, P = 0.53) nor high VATI (sHR = 0.848, 95% CI: 0.539-1.34, P = 0.48) was an independent predictor of death compared with moderate VATI. CONCLUSIONS Both excessive deficiency and accumulation of subcutaneous adipose tissues negatively influence the outcomes of cirrhotic patients.
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Affiliation(s)
- Menghua Zhu
- Department of Gastroenterology, General Hospital of Northern Theater Command (formerly General Hospital of Shenyang Military Area), Shenyang, China.,Postgraduate College, Jinzhou Medical University, Jinzhou, China
| | - Hongyu Li
- Department of Gastroenterology, General Hospital of Northern Theater Command (formerly General Hospital of Shenyang Military Area), Shenyang, China.,Postgraduate College, Jinzhou Medical University, Jinzhou, China.,Postgraduate College, China Medical University, Shenyang, China
| | - Yue Yin
- Department of Gastroenterology, General Hospital of Northern Theater Command (formerly General Hospital of Shenyang Military Area), Shenyang, China.,Postgraduate College, China Medical University, Shenyang, China
| | - Min Ding
- Department of Gastroenterology, General Hospital of Northern Theater Command (formerly General Hospital of Shenyang Military Area), Shenyang, China.,Postgraduate College, China Medical University, Shenyang, China
| | - Cyriac Abby Philips
- Department of Clinical and Translational Hepatology, The Liver Institute, Center of Excellence in GI Sciences, Rajagiri Hospital, Aluva, Kerala, India
| | | | - Xingshun Qi
- Department of Gastroenterology, General Hospital of Northern Theater Command (formerly General Hospital of Shenyang Military Area), Shenyang, China.,Postgraduate College, Jinzhou Medical University, Jinzhou, China.,Postgraduate College, China Medical University, Shenyang, China
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13
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Hypoxia as a Double-Edged Sword to Combat Obesity and Comorbidities. Cells 2022; 11:cells11233735. [PMID: 36496995 PMCID: PMC9736735 DOI: 10.3390/cells11233735] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2022] [Revised: 11/14/2022] [Accepted: 11/17/2022] [Indexed: 11/24/2022] Open
Abstract
The global epidemic of obesity is tightly associated with numerous comorbidities, such as type II diabetes, cardiovascular diseases and the metabolic syndrome. Among the key features of obesity, some studies have suggested the abnormal expansion of adipose-tissue-induced local endogenous hypoxic, while other studies indicated endogenous hyperoxia as the opposite trend. Endogenous hypoxic aggravates dysfunction in adipose tissue and stimulates secretion of inflammatory molecules, which contribute to obesity. In contrast, hypoxic exposure combined with training effectively generate exogenous hypoxic to reduce body weight and downregulate metabolic risks. The (patho)physiological effects in adipose tissue are distinct from those of endogenous hypoxic. We critically assess the latest advances on the molecular mediators of endogenous hypoxic that regulate the dysfunction in adipose tissue. Subsequently we propose potential therapeutic targets in adipose tissues and the small molecules that may reverse the detrimental effect of local endogenous hypoxic. More importantly, we discuss alterations of metabolic pathways in adipose tissue and the metabolic benefits brought by hypoxic exercise. In terms of therapeutic intervention, numerous approaches have been developed to treat obesity, nevertheless durability and safety remain the major concern. Thus, a combination of the therapies that suppress endogenous hypoxic with exercise plans that augment exogenous hypoxic may accelerate the development of more effective and durable medications to treat obesity and comorbidities.
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14
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Mascharak S, desJardins-Park HE, Davitt MF, Guardino NJ, Gurtner GC, Wan DC, Longaker MT. Modulating Cellular Responses to Mechanical Forces to Promote Wound Regeneration. Adv Wound Care (New Rochelle) 2022; 11:479-495. [PMID: 34465219 PMCID: PMC9245727 DOI: 10.1089/wound.2021.0040] [Citation(s) in RCA: 14] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2021] [Accepted: 08/23/2021] [Indexed: 12/13/2022] Open
Abstract
Significance: Skin scarring poses a major biomedical burden for hundreds of millions of patients annually. However, this burden could be mitigated by therapies that promote wound regeneration, with full recovery of skin's normal adnexa, matrix ultrastructure, and mechanical strength. Recent Advances: The observation of wound regeneration in several mouse models suggests a retained capacity for postnatal mammalian skin to regenerate under the right conditions. Mechanical forces are a major contributor to skin fibrosis and a prime target for devices and therapeutics that could promote skin regeneration. Critical Issues: Wound-induced hair neogenesis, Acomys "spiny" mice, Murphy Roths Large mice, and mice treated with mechanotransduction inhibitors all show various degrees of wound regeneration. Comparison of regenerating wounds in these models against scarring wounds reveals differences in extracellular matrix interactions and in mechanosensitive activation of key signaling pathways, including Wnt, Sonic hedgehog, focal adhesion kinase, and Yes-associated protein. The advent of single-cell "omics" technologies has deepened this understanding and revealed that regeneration may recapitulate development in certain contexts, although it is unknown whether these mechanisms are relevant to healing in tight-skinned animals such as humans. Future Directions: While early findings in mice are promising, comparison across model systems is needed to resolve conflicting mechanisms and to identify conserved master regulators of skin regeneration. There also remains a dire need for studies on mechanomodulation of wounds in large, tight-skinned animals, such as red Duroc pigs, which better approximate human wound healing.
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Affiliation(s)
- Shamik Mascharak
- Division of Plastic and Reconstructive Surgery, Department of Surgery; Stanford, California, USA
- Institute for Stem Cell Biology and Regenerative Medicine; Stanford University School of Medicine, Stanford, California, USA
| | - Heather E. desJardins-Park
- Division of Plastic and Reconstructive Surgery, Department of Surgery; Stanford, California, USA
- Institute for Stem Cell Biology and Regenerative Medicine; Stanford University School of Medicine, Stanford, California, USA
| | - Michael F. Davitt
- Division of Plastic and Reconstructive Surgery, Department of Surgery; Stanford, California, USA
| | - Nicholas J. Guardino
- Division of Plastic and Reconstructive Surgery, Department of Surgery; Stanford, California, USA
| | - Geoffrey C. Gurtner
- Division of Plastic and Reconstructive Surgery, Department of Surgery; Stanford, California, USA
| | - Derrick C. Wan
- Division of Plastic and Reconstructive Surgery, Department of Surgery; Stanford, California, USA
| | - Michael T. Longaker
- Division of Plastic and Reconstructive Surgery, Department of Surgery; Stanford, California, USA
- Institute for Stem Cell Biology and Regenerative Medicine; Stanford University School of Medicine, Stanford, California, USA
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15
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Tackling the effects of extracellular vesicles in fibrosis. Eur J Cell Biol 2022; 101:151221. [PMID: 35405464 DOI: 10.1016/j.ejcb.2022.151221] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2022] [Revised: 03/30/2022] [Accepted: 03/31/2022] [Indexed: 11/22/2022] Open
Abstract
Fibrosis is a physiological process of tissue repair that turns into pathological when becomes chronic, damaging the functional structure of the tissue. In this review we outline the current status of extracellular vesicles as modulators of the fibrotic process at different levels. In adipose tissue, extracellular vesicles mediate the intercellular communication not only between adipocytes, but also between adipocytes and other cells of the stromal vascular fraction. Thus, they could be altering essential processes for the functionality of adipose tissue, such as adipocyte hypertrophy/hyperplasia, tissue plasticity, adipogenesis and/or inflammation, and ultimately trigger fibrosis. This process is particularly important in obesity, and may eventually, influence the development of obesity-associated alterations. In this regard, obesity is now recognized as an independent risk factor for the development of chronic kidney disease, although the role of extracellular vesicles in this connection has not been explored so far. Nonetheless, the role of extracellular vesicles in the onset and progression of renal fibrosis has been highlighted due to the critical role of fibrosis as a common feature of kidney diseases. In fact, the content of extracellular vesicles disturbs cellular signaling cascades involved in fibrosis in virtually all types of renal cells. What is certain is that the study of extracellular vesicles is complex, as their isolation and manipulation is still difficult to reproduce, which complicates the overview of their physiopathological effects. Nevertheless, new strategies have been developed to exploit the potential of extracellular vesicles and their cargo, both as biomarkers and as therapeutic tools to prevent the progression of fibrosis towards an irreversible event.
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16
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CXCL4 drives fibrosis by promoting several key cellular and molecular processes. Cell Rep 2022; 38:110189. [PMID: 34986347 DOI: 10.1016/j.celrep.2021.110189] [Citation(s) in RCA: 26] [Impact Index Per Article: 13.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2020] [Revised: 02/28/2021] [Accepted: 12/08/2021] [Indexed: 01/05/2023] Open
Abstract
Fibrosis is a major cause of mortality worldwide, characterized by myofibroblast activation and excessive extracellular matrix deposition. Systemic sclerosis is a prototypic fibrotic disease in which CXCL4 is increased and strongly correlates with skin and lung fibrosis. Here we aim to elucidate the role of CXCL4 in fibrosis development. CXCL4 levels are increased in multiple inflammatory and fibrotic mouse models, and, using CXCL4-deficient mice, we demonstrate the essential role of CXCL4 in promoting fibrotic events in the skin, lungs, and heart. Overexpressing human CXCL4 in mice aggravates, whereas blocking CXCL4 reduces, bleomycin-induced fibrosis. Single-cell ligand-receptor analysis predicts CXCL4 to affect endothelial cells and fibroblasts. In vitro, we confirm that CXCL4 directly induces myofibroblast differentiation and collagen synthesis in different precursor cells, including endothelial cells, by stimulating endothelial-to-mesenchymal transition. Our findings identify a pivotal role of CXCL4 in fibrosis, further substantiating the potential role of neutralizing CXCL4 as a therapeutic strategy.
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17
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Liu S, Wang L, Ling D, Valencak TG, You W, Shan T. Potential key factors involved in regulating adipocyte dedifferentiation. J Cell Physiol 2021; 237:1639-1647. [PMID: 34796916 DOI: 10.1002/jcp.30637] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2021] [Revised: 10/26/2021] [Accepted: 11/09/2021] [Indexed: 12/11/2022]
Abstract
Adipocytes are the key constituents of adipose tissue, and their de-differentiation process has been widely observed in physiological and pathological conditions. For obese people, the promotion of adipocyte de-differentiation or maintenance of an undifferentiated state of adipocytes may help to improve their metabolic condition. Thus, understanding the regulatory mechanisms of adipocyte de-differentiation is necessary for treating metabolic diseases. Attractively, in addition to intracellular signals regulating adipocyte de-differentiation, external factors such as temperature and pressure also affect adipocyte de-differentiation. In this review, we summarize the recent progress in the field and discuss the regulatory roles and mechanisms of involved endogenous and exogenous factors during the process of de-differentiation.
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Affiliation(s)
- Shiqi Liu
- College of Animal Sciences, Zhejiang University, Hangzhou, Zhejiang, China.,Key Laboratory of Molecular Animal Nutrition, Ministry of Education, Hangzhou, Zhejiang, China.,Key Laboratory of Animal Feed and Nutrition of Zhejiang Province, Hangzhou, Zhejiang, China
| | - Liyi Wang
- College of Animal Sciences, Zhejiang University, Hangzhou, Zhejiang, China.,Key Laboratory of Molecular Animal Nutrition, Ministry of Education, Hangzhou, Zhejiang, China.,Key Laboratory of Animal Feed and Nutrition of Zhejiang Province, Hangzhou, Zhejiang, China
| | - Defeng Ling
- College of Animal Sciences, Zhejiang University, Hangzhou, Zhejiang, China.,Key Laboratory of Molecular Animal Nutrition, Ministry of Education, Hangzhou, Zhejiang, China.,Key Laboratory of Animal Feed and Nutrition of Zhejiang Province, Hangzhou, Zhejiang, China
| | - Teresa G Valencak
- College of Animal Sciences, Zhejiang University, Hangzhou, Zhejiang, China
| | - Wenjing You
- College of Animal Sciences, Zhejiang University, Hangzhou, Zhejiang, China.,Key Laboratory of Molecular Animal Nutrition, Ministry of Education, Hangzhou, Zhejiang, China.,Key Laboratory of Animal Feed and Nutrition of Zhejiang Province, Hangzhou, Zhejiang, China
| | - Tizhong Shan
- College of Animal Sciences, Zhejiang University, Hangzhou, Zhejiang, China.,Key Laboratory of Molecular Animal Nutrition, Ministry of Education, Hangzhou, Zhejiang, China.,Key Laboratory of Animal Feed and Nutrition of Zhejiang Province, Hangzhou, Zhejiang, China
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18
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Boosting the Photoaged Skin: The Potential Role of Dietary Components. Nutrients 2021; 13:nu13051691. [PMID: 34065733 PMCID: PMC8156873 DOI: 10.3390/nu13051691] [Citation(s) in RCA: 40] [Impact Index Per Article: 13.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2021] [Revised: 05/11/2021] [Accepted: 05/12/2021] [Indexed: 12/11/2022] Open
Abstract
Skin photoaging is mainly induced by ultraviolet (UV) irradiation and its manifestations include dry skin, coarse wrinkle, irregular pigmentation, and loss of skin elasticity. Dietary supplementation of nutraceuticals with therapeutic and preventive effects against skin photoaging has recently received increasing attention. This article aims to review the research progress in the cellular and molecular mechanisms of UV-induced skin photoaging. Subsequently, the beneficial effects of dietary components on skin photoaging are discussed. The photoaging process and the underlying mechanisms are complex. Matrix metalloproteinases, transforming growth factors, skin adipose tissue, inflammation, oxidative stress, nuclear and mitochondrial DNA, telomeres, microRNA, advanced glycation end products, the hypothalamic-pituitary-adrenal axis, and transient receptor potential cation channel V are key regulators that drive the photoaging-associated changes in skin. Meanwhile, mounting evidence from animal models and clinical trials suggests that various food-derived components attenuate the development and symptoms of skin photoaging. The major mechanisms of these dietary components to alleviate skin photoaging include the maintenance of skin moisture and extracellular matrix content, regulation of specific signaling pathways involved in the synthesis and degradation of the extracellular matrix, and antioxidant capacity. Taken together, the ingestion of food-derived functional components could be an attractive strategy to prevent skin photoaging damage.
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19
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Romano E, Rosa I, Fioretto BS, Cerinic MM, Manetti M. The Role of Pro-fibrotic Myofibroblasts in Systemic Sclerosis: from Origin to Therapeutic Targeting. Curr Mol Med 2021; 22:209-239. [PMID: 33823766 DOI: 10.2174/0929867328666210325102749] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2020] [Revised: 03/02/2021] [Accepted: 03/09/2021] [Indexed: 11/22/2022]
Abstract
Systemic sclerosis (SSc, scleroderma) is a complex connective tissue disorder characterized by multisystem clinical manifestations resulting from immune dysregulation/autoimmunity, vasculopathy and, most notably, progressive fibrosis of the skin and internal organs. In recent years, it has emerged that the main drivers of SSc-related tissue fibrosis are myofibroblasts, a type of mesenchymal cells with both the extracellular matrix-synthesizing features of fibroblasts and the cytoskeletal characteristics of contractile smooth muscle cells. The accumulation and persistent activation of pro-fibrotic myofibroblasts during SSc development and progression result into elevated mechanical stress and reduced matrix plasticity within the affected tissues and may be ascribed to a reduced susceptibility of these cells to pro-apoptotic stimuli, as well as their increased formation from tissue-resident fibroblasts or transition from different cell types. Given the crucial role of myofibroblasts in SSc pathogenesis, finding the way to inhibit myofibroblast differentiation and accumulation by targeting their formation, function and survival may represent an effective approach to hamper the fibrotic process or even halt or reverse established fibrosis. In this review, we discuss the role of myofibroblasts in SSc-related fibrosis, with a special focus on their cellular origin and the signaling pathways implicated in their formation and persistent activation. Furthermore, we provide an overview of potential therapeutic strategies targeting myofibroblasts that may be able to counteract fibrosis in this pathological condition.
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Affiliation(s)
- Eloisa Romano
- Department of Experimental and Clinical Medicine, Division of Rheumatology, University of Florence, Florence. Italy
| | - Irene Rosa
- Department of Experimental and Clinical Medicine, Division of Rheumatology, University of Florence, Florence. Italy
| | - Bianca Saveria Fioretto
- Department of Experimental and Clinical Medicine, Division of Rheumatology, University of Florence, Florence. Italy
| | - Marco Matucci Cerinic
- Department of Experimental and Clinical Medicine, Division of Rheumatology, University of Florence, Florence. Italy
| | - Mirko Manetti
- Department of Experimental and Clinical Medicine, Section of Anatomy and Histology, University of Florence, Florence. Italy
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20
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Kim YS, Cho HH, Cho DI, Jeong HY, Lim SY, Jun JH, Kim MR, Kang BG, Cho M, Kang HJ, Kang WS, Oh GT, Ahn Y. The adipokine Retnla deficiency increases responsiveness to cardiac repair through adiponectin-rich bone marrow cells. Cell Death Dis 2021; 12:307. [PMID: 33753732 PMCID: PMC7985519 DOI: 10.1038/s41419-021-03593-z] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2020] [Accepted: 01/19/2021] [Indexed: 02/07/2023]
Abstract
Resistin-like alpha (Retnla) is a member of the resistin family and known to modulate fibrosis and inflammation. Here, we investigated the role of Retnla in the cardiac injury model. Myocardial infarction (MI) was induced in wild type (WT), Retnla knockout (KO), and Retnla transgenic (TG) mice. Cardiac function was assessed by echocardiography and was significantly preserved in the KO mice, while worsened in the TG group. Angiogenesis was substantially increased in the KO mice, and cardiomyocyte apoptosis was markedly suppressed in the KO mice. By Retnla treatment, the expression of p21 and the ratio of Bax to Bcl2 were increased in cardiomyocytes, while decreased in cardiac fibroblasts. Interestingly, the numbers of cardiac macrophages and unsorted bone marrow cells (UBCs) were higher in the KO mice than in the WT mice. Besides, phosphorylated histone H3(+) cells were more frequent in bone marrow of KO mice. Moreover, adiponectin in UBCs was notably higher in the KO mice compared with WT mice. In an adoptive transfer study, UBCs were isolated from KO mice to transplant to the WT infarcted heart. Cardiac function was better in the KO-UBCs transplanted group in the WT-UBCs transplanted group. Taken together, proliferative and adiponectin-rich bone marrow niche was associated with substantial cardiac recovery by suppression of cardiac apoptosis and proliferation of cardiac fibroblast.
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Affiliation(s)
- Yong Sook Kim
- Cell Regeneration Research Center, Chonnam National University Hospital, Gwangju, Republic of Korea.,Biomedical Research Center, Chonnam National University Hospital, Gwangju, Republic of Korea
| | - Hyang Hee Cho
- Cell Regeneration Research Center, Chonnam National University Hospital, Gwangju, Republic of Korea.,Department of Molecular Medicine, Graduate School, Chonnam National University, Gwangju, Republic of Korea
| | - Dong Im Cho
- Cell Regeneration Research Center, Chonnam National University Hospital, Gwangju, Republic of Korea.,Biomedical Research Center, Chonnam National University Hospital, Gwangju, Republic of Korea
| | - Hye-Yun Jeong
- Cell Regeneration Research Center, Chonnam National University Hospital, Gwangju, Republic of Korea
| | - Soo Yeon Lim
- Cell Regeneration Research Center, Chonnam National University Hospital, Gwangju, Republic of Korea
| | - Ju Hee Jun
- Cell Regeneration Research Center, Chonnam National University Hospital, Gwangju, Republic of Korea
| | - Mi Ra Kim
- Cell Regeneration Research Center, Chonnam National University Hospital, Gwangju, Republic of Korea
| | - Bo Gyeong Kang
- Cell Regeneration Research Center, Chonnam National University Hospital, Gwangju, Republic of Korea
| | - Meeyoung Cho
- Cell Regeneration Research Center, Chonnam National University Hospital, Gwangju, Republic of Korea
| | - Hye-Jin Kang
- Cell Regeneration Research Center, Chonnam National University Hospital, Gwangju, Republic of Korea
| | - Wan Seok Kang
- Cell Regeneration Research Center, Chonnam National University Hospital, Gwangju, Republic of Korea
| | - Goo Taeg Oh
- Department of Life Sciences, Ewha Womans University, Seoul, Republic of Korea
| | - Youngkeun Ahn
- Cell Regeneration Research Center, Chonnam National University Hospital, Gwangju, Republic of Korea. .,Department of Cardiovascular Medicine, Chonnam National University Medical School, Gwangju, Republic of Korea. .,Department of Cardiology, Chonnam National University Hospital, Gwangju, Republic of Korea.
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21
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Rosa I, Romano E, Fioretto BS, Matucci-Cerinic M, Manetti M. Adipose-derived stem cells: Pathophysiologic implications vs therapeutic potential in systemic sclerosis. World J Stem Cells 2021; 13:30-48. [PMID: 33584978 PMCID: PMC7859990 DOI: 10.4252/wjsc.v13.i1.30] [Citation(s) in RCA: 18] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/08/2020] [Revised: 12/04/2020] [Accepted: 12/11/2020] [Indexed: 02/06/2023] Open
Abstract
Adipose-derived stem cells (ADSCs) residing in the stromal vascular fraction (SVF) of white adipose tissue are recently emerging as an alternative tool for stem cell-based therapy in systemic sclerosis (SSc), a complex connective tissue disorder affecting the skin and internal organs with fibrotic and vascular lesions. Several preclinical and clinical studies have reported promising therapeutic effects of fat grafting and autologous SVF/ADSC-based local treatment for facial and hand cutaneous manifestations of SSc patients. However, currently available data indicate that ADSCs may represent a double-edged sword in SSc, as they may exhibit a pro-fibrotic and anti-adipogenic phenotype, possibly behaving as an additional pathogenic source of pro-fibrotic myofibroblasts through the adipocyte-to-myofibroblast transition process. Thus, in the perspective of a larger employ of SSc-ADSCs for further therapeutic applications, it is important to definitely unravel whether these cells present a comparable phenotype and similar immunosuppressive, anti-inflammatory, anti-fibrotic and pro-angiogenic properties in respect to healthy ADSCs. In light of the dual role that ADSCs seem to play in SSc, this review will provide a summary of the most recent insights into the preclinical and clinical studies employing SVF and ADSCs for the treatment of the disease and, at the same time, will focus on the main findings highlighting the possible involvement of these stem cells in SSc-related fibrosis pathogenesis.
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Affiliation(s)
- Irene Rosa
- Department of Experimental and Clinical Medicine, Section of Anatomy and Histology, University of Florence, Florence 50134, Italy
| | - Eloisa Romano
- Department of Experimental and Clinical Medicine, Division of Rheumatology, University of Florence, Florence 50134, Italy
| | - Bianca Saveria Fioretto
- Department of Experimental and Clinical Medicine, Division of Rheumatology, University of Florence, Florence 50134, Italy
| | - Marco Matucci-Cerinic
- Department of Experimental and Clinical Medicine, Division of Rheumatology, University of Florence, Florence 50134, Italy
| | - Mirko Manetti
- Department of Experimental and Clinical Medicine, Section of Anatomy and Histology, University of Florence, Florence 50134, Italy.
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22
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In situ evidence of collagen V and signaling pathway of found inflammatory zone 1 (FIZZ1) is associated with silicotic granuloma in lung mice. Pathol Res Pract 2020; 216:153094. [PMID: 32825961 DOI: 10.1016/j.prp.2020.153094] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/03/2020] [Revised: 06/21/2020] [Accepted: 06/27/2020] [Indexed: 11/21/2022]
Abstract
Inhalation of silica particles causes silicosis: an occupational lung disease characterized by persistent inflammation with granuloma formation that leads to tissue remodeling and impairment of lung function. Although silicosis has been studied intensely, little is known about the crucial cellular mechanisms that initiate and drive the process of inflammation and fibrosis. Recently, found in inflammatory zone 1 (FIZZ1) protein, produced by alveolar macrophages and fibroblasts have been shown to induce the proliferation of myofibroblasts and their transdifferentiation, causing tissue fibrosis. Moreover, autoimmunogenic collagen V, produced by alveolar epithelial cells and fibroblasts, is involved in the pathophysiology of interstitial pulmonary fibrosis and bleomycin-induced lung fibrosis. Based on the aforementioned we hypothesized that FIZZ1 and collagen V may be involved in the silicotic granuloma process in mice lungs. Male C57BL/6 mice (N = 20) received intratracheal administration of silica particles (Silica; 20 mg in 50 μL saline) or saline (Control; 50 μL). After 15 days, the lung histology was performed through immunohistochemistry and morphometric analysis. Within silicotic granulomas, collagen V and FIZZ1 increased, while peroxisome proliferator-activated receptor gamma (PPARγ) positive cells decreased. In addition, the expression of proteins Notch-1, alpha smooth muscle actin (α-SMA) and macrophages163 (CD163) were higher in silicotic granulomas than control lungs. A significant positive correlation was found between collagen V and FIZZ1 (r = 0.70; p < 0.05), collagen V and Notch-1 (r = 0.72; p < 0.05), whereas Collagen V was inversely associated with peroxisome proliferator-activated receptor gamma (r=-0.69; p < 0.05). These findings suggested that collagen V association with FIZZ1, Notch-1 and PPARγ might be a key pathogenic mechanism for silicotic granulomas in mice lungs.
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23
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Shook BA, Wasko RR, Mano O, Rutenberg-Schoenberg M, Rudolph MC, Zirak B, Rivera-Gonzalez GC, López-Giráldez F, Zarini S, Rezza A, Clark DA, Rendl M, Rosenblum MD, Gerstein MB, Horsley V. Dermal Adipocyte Lipolysis and Myofibroblast Conversion Are Required for Efficient Skin Repair. Cell Stem Cell 2020; 26:880-895.e6. [PMID: 32302523 PMCID: PMC7853423 DOI: 10.1016/j.stem.2020.03.013] [Citation(s) in RCA: 144] [Impact Index Per Article: 36.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2019] [Revised: 11/20/2019] [Accepted: 03/18/2020] [Indexed: 12/26/2022]
Abstract
Mature adipocytes store fatty acids and are a common component of tissue stroma. Adipocyte function in regulating bone marrow, skin, muscle, and mammary gland biology is emerging, but the role of adipocyte-derived lipids in tissue homeostasis and repair is poorly understood. Here, we identify an essential role for adipocyte lipolysis in regulating inflammation and repair after injury in skin. Genetic mouse studies revealed that dermal adipocytes are necessary to initiate inflammation after injury and promote subsequent repair. We find through histological, ultrastructural, lipidomic, and genetic experiments in mice that adipocytes adjacent to skin injury initiate lipid release necessary for macrophage inflammation. Tamoxifen-inducible genetic lineage tracing of mature adipocytes and single-cell RNA sequencing revealed that dermal adipocytes alter their fate and generate ECM-producing myofibroblasts within wounds. Thus, adipocytes regulate multiple aspects of repair and may be therapeutic for inflammatory diseases and defective wound healing associated with aging and diabetes.
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Affiliation(s)
- Brett A Shook
- Molecular, Cellular and Developmental Biology, Yale University, New Haven, CT 06511, USA
| | - Renee R Wasko
- Molecular, Cellular and Developmental Biology, Yale University, New Haven, CT 06511, USA
| | - Omer Mano
- Molecular, Cellular and Developmental Biology, Yale University, New Haven, CT 06511, USA; Interdepartmental Neuroscience Program, Yale University, New Haven, CT 06511, USA
| | - Michael Rutenberg-Schoenberg
- Program in Computational Biology and Bioinformatics, Yale University, New Haven, CT 06511, USA; Department of Molecular Biophysics and Biochemistry, Yale University, New Haven, CT 06511, USA
| | - Michael C Rudolph
- Division of Endocrinology, Metabolism and Diabetes, University of Colorado, Denver Anschutz Medical Campus, CO 80045, USA
| | - Bahar Zirak
- Department of Dermatology, University of California, San Francisco, San Francisco, CA 94143, USA
| | | | | | - Simona Zarini
- Interdepartmental Neuroscience Program, Yale University, New Haven, CT 06511, USA
| | - Amélie Rezza
- Black Family Stem Cell Institute, Icahn School of Medicine at Mount Sinai, New York, NY 11766, USA; Department of Developmental and Regenerative Biology, Icahn School of Medicine at Mount Sinai, New York, NY 11766, USA
| | - Damon A Clark
- Molecular, Cellular and Developmental Biology, Yale University, New Haven, CT 06511, USA; Interdepartmental Neuroscience Program, Yale University, New Haven, CT 06511, USA
| | - Michael Rendl
- Black Family Stem Cell Institute, Icahn School of Medicine at Mount Sinai, New York, NY 11766, USA; Department of Developmental and Regenerative Biology, Icahn School of Medicine at Mount Sinai, New York, NY 11766, USA
| | - Michael D Rosenblum
- Department of Dermatology, University of California, San Francisco, San Francisco, CA 94143, USA
| | - Mark B Gerstein
- Program in Computational Biology and Bioinformatics, Yale University, New Haven, CT 06511, USA; Department of Molecular Biophysics and Biochemistry, Yale University, New Haven, CT 06511, USA
| | - Valerie Horsley
- Molecular, Cellular and Developmental Biology, Yale University, New Haven, CT 06511, USA; Department of Dermatology, Yale University, New Haven, CT 06511, USA.
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Ho L, Yip A, Lao F, Botelho F, Richards CD. RELMα is Induced in Airway Epithelial Cells by Oncostatin M Without Requirement of STAT6 or IL-6 in Mouse Lungs In Vivo. Cells 2020; 9:cells9061338. [PMID: 32471168 PMCID: PMC7349350 DOI: 10.3390/cells9061338] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2020] [Revised: 05/21/2020] [Accepted: 05/22/2020] [Indexed: 01/02/2023] Open
Abstract
Resistin-like molecule alpha (RELMα) and YM-1 are secreted proteins implicated in murine models of alternatively activated macrophage (AA/M2) accumulation and Th2-skewed inflammation. Since the gp130 cytokine Oncostatin M (OSM) induces a Th2-like cytokine and AA/M2 skewed inflammation in mouse lung, we here investigated regulation of RELMα and YM-1. Transient pulmonary overexpression of OSM by Adenovirus vector (AdOSM) markedly induced RELMα and YM-1 protein expression in total lung. In situ hybridization showed that RELMα mRNA was highly induced in airway epithelial cells (AEC) and was co-expressed with CD68 mRNA in some but not all CD68+ cells in parenchyma. IL-6 overexpression (a comparator gp130 cytokine) induced RELMα, but at significantly lower levels. IL-6 (assessing IL-6-/- mice) was not required, nor was STAT6 (IL-4/13 canonical signalling) for AdOSM-induction of RELMα in AEC. AEC responded directly to OSM in vitro as assessed by pSTAT3 activation. RELMα-deficient mice showed similar inflammatory cell infiltration and cytokine responses to wt in response to AdOSM, but showed less accumulation of CD206+ AA/M2 macrophages, reduced induction of extracellular matrix gene mRNAs for COL1A1, COL3A1, MMP13, and TIMP1, and reduced parenchymal alpha smooth muscle actin. Thus, RELMα is regulated by OSM in AEC and contributes to extracellular matrix remodelling in mouse lung.
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25
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Adipocyte dedifferentiation in health and diseases. Clin Sci (Lond) 2020; 133:2107-2119. [PMID: 31654064 DOI: 10.1042/cs20190128] [Citation(s) in RCA: 41] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2019] [Revised: 09/27/2019] [Accepted: 10/11/2019] [Indexed: 12/24/2022]
Abstract
Adipose tissues collectively as an endocrine organ and energy storage are crucial for systemic metabolic homeostasis. The major cell type in the adipose tissue, the adipocytes or fat cells, are remarkably plastic and can increase or decrease their size and number to adapt to changes in systemic or local metabolism. Changes in adipocyte size occur through hypertrophy or atrophy, and changes in cell numbers mainly involve de novo generation of new cells or death of existing cells. Recently, dedifferentiation, whereby a mature adipocyte is reverted to an undifferentiated progenitor-like status, has been reported as a mechanism underlying adipocyte plasticity. Dedifferentiation of mature adipocytes has been observed under both physiological and pathological conditions. This review covers several aspects of adipocyte dedifferentiation, its relevance to adipose tissue function, molecular pathways that drive dedifferentiation, and the potential of therapeutic targeting adipocyte dedifferentiation in human health and metabolic diseases.
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Kania G, Rudnik M, Distler O. Involvement of the myeloid cell compartment in fibrogenesis and systemic sclerosis. Nat Rev Rheumatol 2020; 15:288-302. [PMID: 30953037 DOI: 10.1038/s41584-019-0212-z] [Citation(s) in RCA: 29] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
Systemic sclerosis (SSc) is an autoimmune fibrotic disease of unknown aetiology that is characterized by vascular changes in the skin and visceral organs. Autologous haematopoietic stem cell transplantation can improve skin and organ fibrosis in patients with progressive disease and a high risk of organ failure, indicating that cells originating in the bone marrow are important contributors to the pathogenesis of SSc. Animal studies also indicate a pivotal function of myeloid cells in the development of fibrosis leading to changes in the tissue architecture and dysfunction in multiple organs such as the heart, lungs, liver and kidney. In this Review, we summarize current knowledge about the function of myeloid cells in fibrogenesis that occurs in patients with SSc. Targeted therapies currently in clinical studies for SSc might affect myeloid cell-related pathways. Therefore, myeloid cells might be used as cellular biomarkers of disease through the application of high-dimensional techniques such as mass cytometry and single-cell RNA sequencing.
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Affiliation(s)
- Gabriela Kania
- Department of Rheumatology, Center of Experimental Rheumatology, University Hospital Zurich, Zurich, Switzerland
| | - Michal Rudnik
- Department of Rheumatology, Center of Experimental Rheumatology, University Hospital Zurich, Zurich, Switzerland
| | - Oliver Distler
- Department of Rheumatology, Center of Experimental Rheumatology, University Hospital Zurich, Zurich, Switzerland.
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27
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Bielczyk-Maczynska E. White Adipocyte Plasticity in Physiology and Disease. Cells 2019; 8:E1507. [PMID: 31775295 PMCID: PMC6953026 DOI: 10.3390/cells8121507] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2019] [Revised: 11/19/2019] [Accepted: 11/21/2019] [Indexed: 12/15/2022] Open
Abstract
Cellular plasticity is a transformation of a terminally differentiated cell into another cell type, which has been long known to occur in disease and regeneration. However, white adipocytes (fat cells) have only recently been observed to undergo different types of cellular plasticity. Adipocyte transdifferentiation into myofibroblasts and cancer-associated fibroblasts occurs in fibrosis and cancer, respectively. On the other hand, reversible adipocyte dedifferentiation into adipocyte progenitor cells (preadipocytes) has been demonstrated in mammary gland and in dermal adipose tissue. Here we discuss the research on adipocyte plasticity, including the experimental approaches that allowed to detect and study it, the current state of the knowledge, major research questions which remain to be addressed, and the advances required to stimulate adipocyte plasticity research. In the future, the knowledge of the molecular mechanisms of adipocyte plasticity can be utilized both to prevent adipocyte plasticity in disease and to stimulate it for use in regenerative medicine.
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Affiliation(s)
- Ewa Bielczyk-Maczynska
- Department of Chemical and Systems Biology, Stanford University, Stanford, CA 94305, USA
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28
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Manetti M, Romano E, Rosa I, Fioretto BS, Praino E, Guiducci S, Iannone F, Ibba-Manneschi L, Matucci-Cerinic M. Systemic Sclerosis Serum Steers the Differentiation of Adipose-Derived Stem Cells Toward Profibrotic Myofibroblasts: Pathophysiologic Implications. J Clin Med 2019; 8:E1256. [PMID: 31430950 PMCID: PMC6723717 DOI: 10.3390/jcm8081256] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2019] [Revised: 08/06/2019] [Accepted: 08/16/2019] [Indexed: 12/16/2022] Open
Abstract
Systemic sclerosis (SSc; scleroderma) is characterized by life-threatening progressive multiorgan fibrosis orchestrated by profibrotic myofibroblasts originating from different sources. Because recent data demonstrated that the majority of myofibroblasts in a murine scleroderma model arise from adipocytic progenitors through the adipocyte-myofibroblast transition process, we sought to determine whether the SSc microenvironment may affect the differentiation potential of adipose-derived stem cells (ADSC). Normal human ADSC from three donors were treated with serum from SSc patients (n = 6), serum from healthy individuals (n = 6), or recombinant human transforming growth factor-β1 (TGFβ1) as positive control of myofibroblastic phenotype induction. ADSC were subjected to in vitro adipogenic differentiation for up to 21 days in the presence of different stimuli followed by lipid content quantification. In selected experiments, adipocytic and mesenchymal/myofibroblast marker gene and protein expression levels were assessed by Real-Time PCR, immunoblotting and immunofluorescence after administration of different stimuli for 72 and 96 h, respectively. Cell contractile phenotype was assayed by collagen gel contraction assay. Likewise stimulation with TGFβ1, SSc serum was able to significantly inhibit the adipocyte differentiation of ADSC as testified by a strong decrease in red-colored lipid droplets after 21 days of adipogenic induction. Treatment of ADSC either with SSc serum or TGFβ1 resulted in the acquisition of a myofibroblast-like phenotype characterized by a reduced expression of the adipocytic markers perilipin and adiponectin, a significant upregulation of the mesenchymal/myofibroblast markers α-SMA+ stress fibers, S100A4 and type I collagen, and an ability to effectively contract collagen gels. In SSc, the pathologic environment may favor the differentiation of ADSC into profibrotic and contractile myofibroblast-like cells. These findings strengthen the notion that the generation of myofibroblasts from ADSC may be relevant in SSc pathophysiology potentially representing a new target for the prevention/treatment of multiorgan fibrosis.
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Affiliation(s)
- Mirko Manetti
- Section of Anatomy and Histology, Department of Experimental and Clinical Medicine, University of Florence, 50134 Florence, Italy.
| | - Eloisa Romano
- Division of Rheumatology and Scleroderma Unit, AOUC, Department of Geriatric Medicine, Department of Experimental and Clinical Medicine, University of Florence, 50134 Florence, Italy
| | - Irene Rosa
- Section of Anatomy and Histology, Department of Experimental and Clinical Medicine, University of Florence, 50134 Florence, Italy
- Division of Rheumatology and Scleroderma Unit, AOUC, Department of Geriatric Medicine, Department of Experimental and Clinical Medicine, University of Florence, 50134 Florence, Italy
| | - Bianca Saveria Fioretto
- Division of Rheumatology and Scleroderma Unit, AOUC, Department of Geriatric Medicine, Department of Experimental and Clinical Medicine, University of Florence, 50134 Florence, Italy
| | - Emanuela Praino
- Rheumatology Unit, Department of Emergency and Organ Transplantation, University of Bari, 70121 Bari, Italy
| | - Serena Guiducci
- Division of Rheumatology and Scleroderma Unit, AOUC, Department of Geriatric Medicine, Department of Experimental and Clinical Medicine, University of Florence, 50134 Florence, Italy
| | - Florenzo Iannone
- Rheumatology Unit, Department of Emergency and Organ Transplantation, University of Bari, 70121 Bari, Italy
| | - Lidia Ibba-Manneschi
- Section of Anatomy and Histology, Department of Experimental and Clinical Medicine, University of Florence, 50134 Florence, Italy
| | - Marco Matucci-Cerinic
- Division of Rheumatology and Scleroderma Unit, AOUC, Department of Geriatric Medicine, Department of Experimental and Clinical Medicine, University of Florence, 50134 Florence, Italy
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29
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Kruglikov IL, Zhang Z, Scherer PE. The Role of Immature and Mature Adipocytes in Hair Cycling. Trends Endocrinol Metab 2019; 30:93-105. [PMID: 30558832 PMCID: PMC6348020 DOI: 10.1016/j.tem.2018.11.004] [Citation(s) in RCA: 32] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/03/2018] [Revised: 10/29/2018] [Accepted: 11/20/2018] [Indexed: 02/06/2023]
Abstract
Hair follicles (HFs) strongly interact with adipocytes within the dermal white adipose tissue (dWAT), suggesting a strong physiological dependence on the content of immature and mature adipocytes in this layer. This content is regulated by the proliferation and differentiation of adipocyte precursors, as well as by dedifferentiation of mature existing adipocytes. Spatially, long-range interactions between HFs and dWAT involve the exchange of extracellular vesicles which are differentially released by precursors, preadipocytes, and mature adipocytes. Different exogenous factors, including light irradiation, are likely to modify the release of adipocyte-derived exosomes in dWAT, which can lead to aberrations of the HF cycle. Consequently, dWAT should be considered as a potential target for the modulation of hair growth.
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Affiliation(s)
| | - Zhuzhen Zhang
- Touchstone Diabetes Center, Department of Internal Medicine, University of Texas Southwestern Medical Center, Dallas, TX 75390-8549, USA
| | - Philipp E Scherer
- Touchstone Diabetes Center, Department of Internal Medicine, University of Texas Southwestern Medical Center, Dallas, TX 75390-8549, USA.
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30
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van Caam A, Vonk M, van den Hoogen F, van Lent P, van der Kraan P. Unraveling SSc Pathophysiology; The Myofibroblast. Front Immunol 2018; 9:2452. [PMID: 30483246 PMCID: PMC6242950 DOI: 10.3389/fimmu.2018.02452] [Citation(s) in RCA: 90] [Impact Index Per Article: 15.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2018] [Accepted: 10/04/2018] [Indexed: 12/31/2022] Open
Abstract
Systemic sclerosis (SSc) is a severe auto-immune disease, characterized by vasculopathy and fibrosis of connective tissues. SSc has a high morbidity and mortality and unfortunately no disease modifying therapy is currently available. A key cell in the pathophysiology of SSc is the myofibroblast. Myofibroblasts are fibroblasts with contractile properties that produce a large amount of pro-fibrotic extracellular matrix molecules such as collagen type I. In this narrative review we will discuss the presence, formation, and role of myofibroblasts in SSc, and how these processes are stimulated and mediated by cells of the (innate) immune system such as mast cells and T helper 2 lymphocytes. Furthermore, current novel therapeutic approaches to target myofibroblasts will be highlighted for future perspective.
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Affiliation(s)
- Arjan van Caam
- Experimental Rheumatology, Radboudumc, Nijmegen, Netherlands
| | - Madelon Vonk
- Department of Rheumatology, Radboudumc, Nijmegen, Netherlands
| | | | - Peter van Lent
- Experimental Rheumatology, Radboudumc, Nijmegen, Netherlands
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31
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Yue X, Yu X, Petersen F, Riemekasten G. Recent advances in mouse models for systemic sclerosis. Autoimmun Rev 2018; 17:1225-1234. [PMID: 30316997 DOI: 10.1016/j.autrev.2018.06.013] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2018] [Accepted: 06/30/2018] [Indexed: 12/13/2022]
Abstract
SSc is a complex rheumatoid disease characterized by autoimmunity, fibrosis and vasculopathy. Mouse models provide powerful research tools for exploring the pathogenesis of the human diseases. Each mouse model can represent a specific way leading to the development of disease. Moreover, mouse models can be used to investigate the role of candidate molecule in the pathogenesis of disease. So far, more than twenty mouse models for SSc have been established and provide new insights in the understanding of the pathogenesis of SSc. In this review, we provide an overview on recent advances in the field of experimental SSc. We introduce novel mouse models generated in the recent years and discuss their relevance to the SSc pathogenesis. Moreover, we summarize and discuss recent findings in the pathogenesis of classical SSc mouse models.
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Affiliation(s)
- Xiaoyang Yue
- Priority Area Asthma & Allergy, Research Center Borstel, 23845 Borstel, Germany; Airway Research Center North (ARCN), Members of the German Center for Lung Research (DZL), Germany
| | - Xinhua Yu
- Priority Area Asthma & Allergy, Research Center Borstel, 23845 Borstel, Germany; Airway Research Center North (ARCN), Members of the German Center for Lung Research (DZL), Germany
| | - Frank Petersen
- Priority Area Asthma & Allergy, Research Center Borstel, 23845 Borstel, Germany; Airway Research Center North (ARCN), Members of the German Center for Lung Research (DZL), Germany
| | - Gabriela Riemekasten
- Airway Research Center North (ARCN), Members of the German Center for Lung Research (DZL), Germany; Department of Rheumatology, University of Lübeck, 23538 Lübeck, Germany.
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32
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Abstract
At the simplest level, obesity is the manifestation of an imbalance between caloric intake and expenditure; however, the pathophysiological mechanisms that govern the development of obesity and associated complications are enormously complex. Fibrosis within the adipose tissue compartment is one such factor that may influence the development of obesity and/or obesity-related comorbidities. Furthermore, the functional consequences of adipose tissue fibrosis are a matter of considerable debate, with evidence that fibrosis serves both adaptive and maladaptive roles. Tissue fibrosis itself is incompletely understood, and multiple cellular and molecular pathways are involved in the development, maintenance, and resolution of the fibrotic state. Within the context of obesity, fibrosis influences molecular and cellular events that relate to adipocytes, inflammatory cells, inflammatory mediators, and supporting adipose stromal tissue. In this Review, we explore what is known about the interplay between the development of adipose tissue fibrosis and obesity, with a view toward future investigative and therapeutic avenues.
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Affiliation(s)
| | - Michael J Podolsky
- Cardiovascular Research Institute.,Lung Biology Center, and.,Department of Medicine, University of California, San Francisco, San Francisco, California, USA
| | - Kamran Atabai
- Cardiovascular Research Institute.,Lung Biology Center, and.,Department of Medicine, University of California, San Francisco, San Francisco, California, USA
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33
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Pine GM, Batugedara HM, Nair MG. Here, there and everywhere: Resistin-like molecules in infection, inflammation, and metabolic disorders. Cytokine 2018; 110:442-451. [PMID: 29866514 DOI: 10.1016/j.cyto.2018.05.014] [Citation(s) in RCA: 61] [Impact Index Per Article: 10.2] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2018] [Revised: 05/13/2018] [Accepted: 05/15/2018] [Indexed: 02/07/2023]
Abstract
The Resistin-Like Molecules (RELM) α, β, and γ and their namesake, resistin, share structural and sequence homology but exhibit significant diversity in expression and function within their mammalian host. RELM proteins are expressed in a wide range of diseases, such as: microbial infections (eg. bacterial and helminth), inflammatory diseases (eg. asthma, fibrosis) and metabolic disorders (eg. diabetes). While the expression pattern and molecular regulation of RELM proteins are well characterized, much controversy remains over their proposed functions, with evidence of host-protective and pathogenic roles. Moreover, the receptors for RELM proteins are unclear, although three receptors for resistin, decorin, adenylyl cyclase-associated protein 1 (CAP1), and Toll-like Receptor 4 (TLR4) have recently been proposed. In this review, we will first summarize the molecular regulation of the RELM gene family, including transcription regulation and tissue expression in humans and mouse disease models. Second, we will outline the function and receptor-mediated signaling associated with RELM proteins. Finally, we will discuss recent studies suggesting that, despite early misconceptions that these proteins are pathogenic, RELM proteins have a more nuanced and potentially beneficial role for the host in certain disease settings.
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Affiliation(s)
- Gabrielle M Pine
- Division of Biomedical Sciences, School of Medicine, University of California Riverside, Riverside, CA, United States
| | - Hashini M Batugedara
- Division of Biomedical Sciences, School of Medicine, University of California Riverside, Riverside, CA, United States
| | - Meera G Nair
- Division of Biomedical Sciences, School of Medicine, University of California Riverside, Riverside, CA, United States.
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34
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Abstract
Purpose of Review This review provides a summary of recent insights into the role of the local white adipose tissue (WAT) in systemic sclerosis. Recent Findings Adipocytes located in an interfacial WAT area adjacent to fibrotic lesions have an intermediate phenotype and special properties implicated in fibrotic pathology in systemic sclerosis (SSc). The important role of these cells is recognized in different pathologies, such as wound healing, psoriasis, breast cancer, and prostate cancer. Additionally, both immature and mature adipocytes are involved in the appearance of fibroblast-like cells but exhibit different phenotypes and synthetic properties. Summary Adipocytes from interfacial WAT adjacent to the fibrotic area in SSc are phenotypically different from bulk adipocytes and are involved in pathogenesis of SSc. Immature and mature adipocytes from this WAT layer differentiate into various types of fibroblast-like cells, making the local ratio of immature to mature adipocytes in interfacial WAT of particular importance in SSc pathogenesis.
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35
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Hosoya A, Takahama A, Nakamura H. Localization of RELM-β/FIZZ2 Is Associated with Cementum Formation. Anat Rec (Hoboken) 2017; 300:1865-1874. [PMID: 28681425 DOI: 10.1002/ar.23636] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2016] [Revised: 01/16/2017] [Accepted: 01/27/2017] [Indexed: 11/09/2022]
Affiliation(s)
- Akihiro Hosoya
- Department of Oral Histology; Matsumoto Dental University; Nagano Japan
| | - Akira Takahama
- Department of Oral Histology; Matsumoto Dental University; Nagano Japan
| | - Hiroaki Nakamura
- Department of Oral Histology; Matsumoto Dental University; Nagano Japan
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36
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Tan J, Wu J. Current progress in understanding the molecular pathogenesis of burn scar contracture. BURNS & TRAUMA 2017; 5:14. [PMID: 28546987 PMCID: PMC5441009 DOI: 10.1186/s41038-017-0080-1] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/13/2017] [Accepted: 04/17/2017] [Indexed: 01/17/2023]
Abstract
Abnormal wound healing is likely to induce scar formation, leading to dysfunction, deformity, and psychological trauma in burn patients. Despite the advancement of medical care treatment, scar contracture in burn patients remains a challenge. Myofibroblasts play a key role in scar contracture. It has been demonstrated that myofibroblasts, as well as inflammatory cells, fibroblasts, endothelial cells, and epithelial cells, secrete transforming growth factor-β1 (TGF-β1) and other cytokines, which can promote persistent myofibroblast activation via a positive regulation loop. In addition to the cellular contribution, the microenvironments, including the mechanical tension and integrin family, are also involved in scar contracture. Most recently, eukaryotic initiation factor 6 (eIF6), an upstream regulator of TGF-β1, has been demonstrated to be involved in myofibroblast differentiation and contraction in both in vitro fibroblast-populated collagen lattice (FPCL) and in vivo external mechanical stretch models. Moreover, the data showed that P311 could induce the transdifferentiation of epidermal stem cells to myofibroblasts by upregulating TGF-β1 expression, which mediated myofibroblast contraction. In this review, we briefly described the most current progress on the biological function of myofibroblasts in scar contracture and subsequently summarized the molecular events that initiated contracture. This would help us better understand the molecular basis of scar contracture as well as to find a comprehensive strategy for preventing/managing scar contracture.
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Affiliation(s)
- Jianglin Tan
- Institute of Burn Research, State Key Laboratory of Trauma, Burns and Combined Injuries, Chongqing Key Laboratory for Disease Proteomics, Southwest Hospital, Third Military Medical University, Chongqing, 400038 China
| | - Jun Wu
- Department of Burns, First Affiliated Hospital of Sun Yat-sen University, Guangzhou, 510080 China
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37
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Rosenbloom J, Macarak E, Piera-Velazquez S, Jimenez SA. Human Fibrotic Diseases: Current Challenges in Fibrosis Research. Methods Mol Biol 2017; 1627:1-23. [PMID: 28836191 DOI: 10.1007/978-1-4939-7113-8_1] [Citation(s) in RCA: 95] [Impact Index Per Article: 13.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Human fibrotic diseases constitute a major health problem worldwide owing to the large number of affected individuals, the incomplete knowledge of the fibrotic process pathogenesis, the marked heterogeneity in their etiology and clinical manifestations, the absence of appropriate and fully validated biomarkers, and, most importantly, the current void of effective disease-modifying therapeutic agents. The fibrotic disorders encompass a wide spectrum of clinical entities including systemic fibrotic diseases such as systemic sclerosis (SSc), sclerodermatous graft vs. host disease, and nephrogenic systemic fibrosis, as well as numerous organ-specific disorders including radiation-induced fibrosis and cardiac, pulmonary, liver, and kidney fibrosis. Although their causative mechanisms are quite diverse and in several instances have remained elusive, these diseases share the common feature of an uncontrolled and progressive accumulation of fibrotic tissue in affected organs causing their dysfunction and ultimate failure. Despite the remarkable heterogeneity in the etiologic mechanisms responsible for the development of fibrotic diseases and in their clinical manifestations, numerous studies have identified activated myofibroblasts as the common cellular element ultimately responsible for the replacement of normal tissues with nonfunctional fibrotic tissue. Critical signaling cascades, initiated primarily by transforming growth factor-β (TGF-β), but also involving numerous cytokines and signaling molecules which stimulate profibrotic reactions in myofibroblasts, offer potential therapeutic targets. Here, we briefly review the current knowledge of the molecular mechanisms involved in the development of tissue fibrosis and point out some of the most important challenges to research in the fibrotic diseases and to the development of effective therapeutic approaches for this often fatal group of disorders. Efforts to further clarify the complex pathogenetic mechanisms of the fibrotic process should be encouraged to attain the elusive goal of developing effective therapies for these serious, untreatable, and often fatal disorders.
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Affiliation(s)
- Joel Rosenbloom
- The Joan and Joel Rosenbloom Center for Fibrotic Diseases and The Jefferson Institute of Molecular Medicine, Thomas Jefferson University, Philadelphia, PA, USA
| | - Edward Macarak
- The Joan and Joel Rosenbloom Center for Fibrotic Diseases and The Jefferson Institute of Molecular Medicine, Thomas Jefferson University, Philadelphia, PA, USA
| | - Sonsoles Piera-Velazquez
- The Joan and Joel Rosenbloom Center for Fibrotic Diseases and The Jefferson Institute of Molecular Medicine, Thomas Jefferson University, Philadelphia, PA, USA
| | - Sergio A Jimenez
- The Joan and Joel Rosenbloom Center for Fibrotic Diseases and The Jefferson Institute of Molecular Medicine, Thomas Jefferson University, Philadelphia, PA, USA.
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38
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Chia JJ, Zhu T, Chyou S, Dasoveanu DC, Carballo C, Tian S, Magro CM, Rodeo S, Spiera RF, Ruddle NH, McGraw TE, Browning JL, Lafyatis R, Gordon JK, Lu TT. Dendritic cells maintain dermal adipose-derived stromal cells in skin fibrosis. J Clin Invest 2016; 126:4331-4345. [PMID: 27721238 DOI: 10.1172/jci85740] [Citation(s) in RCA: 35] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2015] [Accepted: 08/30/2016] [Indexed: 12/14/2022] Open
Abstract
Scleroderma is a group of skin-fibrosing diseases for which there are no effective treatments. A feature of the skin fibrosis typical of scleroderma is atrophy of the dermal white adipose tissue (DWAT). Adipose tissue contains adipose-derived mesenchymal stromal cells (ADSCs) that have regenerative and reparative functions; however, whether DWAT atrophy in fibrosis is accompanied by ADSC loss is poorly understood, as are the mechanisms that might maintain ADSC survival in fibrotic skin. Here, we have shown that DWAT ADSC numbers were reduced, likely because of cell death, in 2 murine models of scleroderma skin fibrosis. The remaining ADSCs showed a partial dependence on dendritic cells (DCs) for survival. Lymphotoxin β (LTβ) expression in DCs maintained ADSC survival in fibrotic skin by activating an LTβ receptor/β1 integrin (LTβR/β1 integrin) pathway on ADSCs. Stimulation of LTβR augmented the engraftment of therapeutically injected ADSCs, which was associated with reductions in skin fibrosis and improved skin function. These findings provide insight into the effects of skin fibrosis on DWAT ADSCs, identify a DC-ADSC survival axis in fibrotic skin, and suggest an approach for improving mesenchymal stromal cell therapy in scleroderma and other diseases.
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Shook B, Rivera Gonzalez G, Ebmeier S, Grisotti G, Zwick R, Horsley V. The Role of Adipocytes in Tissue Regeneration and Stem Cell Niches. Annu Rev Cell Dev Biol 2016; 32:609-631. [PMID: 27146311 PMCID: PMC5157158 DOI: 10.1146/annurev-cellbio-111315-125426] [Citation(s) in RCA: 45] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
Classically, white adipose tissue (WAT) was considered an inert component of connective tissue but is now appreciated as a major regulator of metabolic physiology and endocrine homeostasis. Recent work defining how WAT develops and expands in vivo emphasizes the importance of specific locations of WAT or depots in metabolic regulation. Interestingly, mature white adipocytes are integrated into several tissues. A new perspective regarding the in vivo regulation and function of WAT in these tissues has highlighted an essential role of adipocytes in tissue homeostasis and regeneration. Finally, there has been significant progress in understanding how mature adipocytes regulate the pathology of several diseases. In this review, we discuss these novel roles of WAT in the homeostasis and regeneration of epithelial, muscle, and immune tissues and how they contribute to the pathology of several disorders.
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Affiliation(s)
- Brett Shook
- Department of Molecular, Cellular and Developmental Biology, Yale University, New Haven, Connecticut 06520;
| | - Guillermo Rivera Gonzalez
- Department of Molecular, Cellular and Developmental Biology, Yale University, New Haven, Connecticut 06520;
| | - Sarah Ebmeier
- Department of Molecular, Cellular and Developmental Biology, Yale University, New Haven, Connecticut 06520;
| | | | - Rachel Zwick
- Department of Molecular, Cellular and Developmental Biology, Yale University, New Haven, Connecticut 06520;
| | - Valerie Horsley
- Department of Molecular, Cellular and Developmental Biology, Yale University, New Haven, Connecticut 06520;
- Department of Dermatology, Yale University, New Haven, Connecticut 06520
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Kruglikov IL, Scherer PE. Skin aging: are adipocytes the next target? Aging (Albany NY) 2016; 8:1457-69. [PMID: 27434510 PMCID: PMC4993342 DOI: 10.18632/aging.100999] [Citation(s) in RCA: 39] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2016] [Accepted: 07/07/2016] [Indexed: 01/09/2023]
Abstract
Dermal white adipose tissue (dWAT) is increasingly appreciated as a special fat depot. The adipocytes in this depot exert a variety of unique effects on their surrounding cells and can undergo massive phenotypic changes. Significant modulation of dWAT content can be observed both in intrinsically and extrinsically aged skin. Specifically, skin that has been chronically photo-damaged displays a reduction of the dWAT volume, caused by the replacement of adipocytes by fibrotic structures. This is likely to be caused by the recently uncovered process described as "adipocyte-myofibroblast transition" (AMT). In addition, contributions of dermal adipocytes to the skin aging processes are also indirectly supported by spatial correlations between the prevalence of hypertrophic scarring and the appearance of signs of skin aging in different ethnic groups. These observations could elevate dermal adipocytes to prime targets in strategies aimed at counteracting skin aging.
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Affiliation(s)
| | - Philipp E. Scherer
- Touchstone Diabetes Center, Departments of Internal Medicine and Cell Biology, University of Texas Southwestern Medical Center, Dallas, TX 75390, USA
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Kruglikov IL, Scherer PE. Dermal Adipocytes: From Irrelevance to Metabolic Targets? Trends Endocrinol Metab 2016; 27:1-10. [PMID: 26643658 PMCID: PMC4698208 DOI: 10.1016/j.tem.2015.11.002] [Citation(s) in RCA: 82] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/20/2015] [Revised: 11/03/2015] [Accepted: 11/04/2015] [Indexed: 01/12/2023]
Abstract
Dermal white adipose tissue (dWAT) has received little appreciation in the past as a distinct entity from the better recognized subcutaneous white adipose tissue (sWAT). However, recent work has established dWAT as an important contributor to a multitude of processes, including immune response, wound healing and scarring, hair follicle (HF) growth, and thermoregulation. Unique metabolic contributions have also been attributed to dWAT, at least in part due to its thermic insulation properties and response to cold exposure. Dermal adipocytes can also undergo an adipocyte-myofibroblast transition (AMT), a process that is suspected to have an important role in several pathophysiological processes within the skin. Here, we discuss emerging concepts regarding dWAT physiology and its significance to a variety of cellular processes.
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Affiliation(s)
| | - Philipp E Scherer
- Touchstone Diabetes Center, Departments of Internal Medicine and Cell Biology, University of Texas Southwestern Medical Center, Dallas, TX 75390, USA.
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