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Moulton MJ, Atala K, Zheng Y, Dutta D, Grange DK, Lin WW, Wegner DJ, Wambach JA, Duker AL, Bober MB, Kratz L, Wise CA, Oxendine I, Khanshour A, Wangler MF, Yamamoto S, Cole FS, Rios J, Bellen HJ. Dominant missense variants in SREBF2 are associated with complex dermatological, neurological, and skeletal abnormalities. Genet Med 2024; 26:101174. [PMID: 38847193 DOI: 10.1016/j.gim.2024.101174] [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: 01/30/2024] [Revised: 05/28/2024] [Accepted: 05/29/2024] [Indexed: 07/21/2024] Open
Abstract
PURPOSE We identified 2 individuals with de novo variants in SREBF2 that disrupt a conserved site 1 protease (S1P) cleavage motif required for processing SREBP2 into its mature transcription factor. These individuals exhibit complex phenotypic manifestations that partially overlap with sterol regulatory element binding proteins (SREBP) pathway-related disease phenotypes, but SREBF2-related disease has not been previously reported. Thus, we set out to assess the effects of SREBF2 variants on SREBP pathway activation. METHODS We undertook ultrastructure and gene expression analyses using fibroblasts from an affected individual and utilized a fly model of lipid droplet (LD) formation to investigate the consequences of SREBF2 variants on SREBP pathway function. RESULTS We observed reduced LD formation, endoplasmic reticulum expansion, accumulation of aberrant lysosomes, and deficits in SREBP2 target gene expression in fibroblasts from an affected individual, indicating that the SREBF2 variant inhibits SREBP pathway activation. Using our fly model, we discovered that SREBF2 variants fail to induce LD production and act in a dominant-negative manner, which can be rescued by overexpression of S1P. CONCLUSION Taken together, these data reveal a mechanism by which SREBF2 pathogenic variants that disrupt the S1P cleavage motif cause disease via dominant-negative antagonism of S1P, limiting the cleavage of S1P targets, including SREBP1 and SREBP2.
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Affiliation(s)
- Matthew J Moulton
- Department of Molecular and Human Genetics, Baylor College of Medicine, Houston, TX; Jan and Dan Duncan Neurological Research Institute, Texas Children's Hospital, Houston, TX
| | - Kristhen Atala
- Center for Translational Research, Scottish Rite for Children, Dallas, TX
| | - Yiming Zheng
- Department of Molecular and Human Genetics, Baylor College of Medicine, Houston, TX; Jan and Dan Duncan Neurological Research Institute, Texas Children's Hospital, Houston, TX; Current address: State Key Laboratory of Cellular Stress Biology, School of Life Sciences, Faculty of Medicine and Life Sciences, Xiamen University, Xiamen, China
| | - Debdeep Dutta
- Department of Molecular and Human Genetics, Baylor College of Medicine, Houston, TX; Jan and Dan Duncan Neurological Research Institute, Texas Children's Hospital, Houston, TX
| | - Dorothy K Grange
- Edward Mallinckrodt Department of Pediatrics, Washington University in St. Louis School of Medicine and St. Louis Children's Hospital, St. Louis, MO
| | - Wen-Wen Lin
- Department of Molecular and Human Genetics, Baylor College of Medicine, Houston, TX; Jan and Dan Duncan Neurological Research Institute, Texas Children's Hospital, Houston, TX
| | - Daniel J Wegner
- Edward Mallinckrodt Department of Pediatrics, Washington University in St. Louis School of Medicine and St. Louis Children's Hospital, St. Louis, MO
| | - Jennifer A Wambach
- Edward Mallinckrodt Department of Pediatrics, Washington University in St. Louis School of Medicine and St. Louis Children's Hospital, St. Louis, MO
| | - Angela L Duker
- Skeletal Dysplasia Program, Orthogenetics, Nemours Children's Hospital, Wilmington, DE
| | - Michael B Bober
- Skeletal Dysplasia Program, Orthogenetics, Nemours Children's Hospital, Wilmington, DE
| | - Lisa Kratz
- Kennedy Krieger Institute, Department of Genetic Medicine, Johns Hopkins University School of Medicine, Baltimore, MD
| | - Carol A Wise
- Center for Translational Research, Scottish Rite for Children, Dallas, TX; Eugene McDermott Center for Human Growth and Development, University of Texas Southwestern Medical Center, Dallas, TX; Department of Pediatrics, University of Texas Southwestern Medical Center, Dallas, TX; Department of Orthopedic Surgery, University of Texas Southwestern Medical Center, Dallas, TX
| | - Ila Oxendine
- Center for Translational Research, Scottish Rite for Children, Dallas, TX
| | - Anas Khanshour
- Center for Translational Research, Scottish Rite for Children, Dallas, TX
| | - Michael F Wangler
- Department of Molecular and Human Genetics, Baylor College of Medicine, Houston, TX; Jan and Dan Duncan Neurological Research Institute, Texas Children's Hospital, Houston, TX
| | - Shinya Yamamoto
- Department of Molecular and Human Genetics, Baylor College of Medicine, Houston, TX; Jan and Dan Duncan Neurological Research Institute, Texas Children's Hospital, Houston, TX
| | - F Sessions Cole
- Edward Mallinckrodt Department of Pediatrics, Washington University in St. Louis School of Medicine and St. Louis Children's Hospital, St. Louis, MO
| | - Jonathan Rios
- Center for Translational Research, Scottish Rite for Children, Dallas, TX; Eugene McDermott Center for Human Growth and Development, University of Texas Southwestern Medical Center, Dallas, TX; Department of Pediatrics, University of Texas Southwestern Medical Center, Dallas, TX; Department of Orthopedic Surgery, University of Texas Southwestern Medical Center, Dallas, TX
| | - Hugo J Bellen
- Department of Molecular and Human Genetics, Baylor College of Medicine, Houston, TX; Jan and Dan Duncan Neurological Research Institute, Texas Children's Hospital, Houston, TX.
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Liaqat K, Treat K, Mantcheva L, Nasir A, Weaver DD, Conboy E, Vetrini F. A case of MBTPS1-related disorder due to compound heterozygous variants in MBTPS1 gene: Genotype-phenotype expansion and the emergence of a novel syndrome. Am J Med Genet A 2024; 194:e63499. [PMID: 38135440 DOI: 10.1002/ajmg.a.63499] [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: 10/18/2023] [Revised: 11/23/2023] [Accepted: 11/28/2023] [Indexed: 12/24/2023]
Abstract
MBTPS1 (NM_003791.4) encodes Site-1 protease, a serine protease that functions sequentially with Site-2 protease regulating cholesterol homeostasis and endoplasmic reticulum stress response. MBTPS1 pathogenic variants are associated with spondyloepiphyseal dysplasia, Kondo-Fu type (MIM:618392; cataract, alopecia, oral mucosal disorder, and psoriasis-like syndrome, and Silver-Russell-like syndrome). In this report, we describe a 14-year-old female with a complex medical history including white matter volume loss, early-onset cataracts, retrognathia, laryngomalacia, inguinal hernia, joint hypermobility, feeding dysfunction, and speech delay. Additionally, features of ectodermal dysplasia that she has include decreased sweating, heat intolerance, dysplastic nails, chronically dry skin, and abnormal hair growth issues. Exome sequencing analysis identified compound heterozygous variants in the MBTPS1 gene: c.2255G > T p.(Gly752Val) predicted to affect important function of the protein, which was inherited from the mother, and a splice site variant c.2831 + 5G > T, which was inherited from the father. The RNA-seq analysis of the splice variant showed skipping of exon 21, predicted to result in frameshifting p.(Ser901fs28*) leading to non-sense mediated decay. To our knowledge, only eight studies have been published that described the MBPTS1-related disorders. Interestingly, we observed the features of ectodermal dysplasia in our patient that further expands the phenotypic spectrum of MBTPS1 gene-related disorders.
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Affiliation(s)
- Khurram Liaqat
- Department of Medical and Molecular Genetics, Indiana University School of Medicine, Indianapolis, Indiana, USA
- Undiagnosed Rare Disease Clinic (URDC), Indiana University School of Medicine, Indianapolis, Indiana, USA
| | - Kayla Treat
- Department of Medical and Molecular Genetics, Indiana University School of Medicine, Indianapolis, Indiana, USA
- Undiagnosed Rare Disease Clinic (URDC), Indiana University School of Medicine, Indianapolis, Indiana, USA
| | - Lili Mantcheva
- Department of Medical and Molecular Genetics, Indiana University School of Medicine, Indianapolis, Indiana, USA
- Undiagnosed Rare Disease Clinic (URDC), Indiana University School of Medicine, Indianapolis, Indiana, USA
| | - Abdul Nasir
- Department of Anesthesiology, Second Affiliated Hospital of Zhengzhou University, Zhengzhou, China
| | - David D Weaver
- Department of Medical and Molecular Genetics, Indiana University School of Medicine, Indianapolis, Indiana, USA
| | - Erin Conboy
- Department of Medical and Molecular Genetics, Indiana University School of Medicine, Indianapolis, Indiana, USA
- Undiagnosed Rare Disease Clinic (URDC), Indiana University School of Medicine, Indianapolis, Indiana, USA
| | - Francesco Vetrini
- Department of Medical and Molecular Genetics, Indiana University School of Medicine, Indianapolis, Indiana, USA
- Undiagnosed Rare Disease Clinic (URDC), Indiana University School of Medicine, Indianapolis, Indiana, USA
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3
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Ibrahim MS, Elsayyad NME, Salama A, Noshi SH. Utilization of response surface design for development and optimization of rosuvastatin calcium-loaded nano-squarticles for hair growth stimulating VEGF and IGF production: in-vitro and in-vivo evaluation. Drug Dev Ind Pharm 2023; 49:580-589. [PMID: 37725083 DOI: 10.1080/03639045.2023.2259993] [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: 07/17/2023] [Accepted: 09/12/2023] [Indexed: 09/21/2023]
Abstract
INTRODUCTION Countless individuals experience negative emotions as hair loss pattern affects their self-esteem and well-being. Rosuvastatin calcium (Ca-RUV) was reported to stimulate the growth of the hair in the applied area, hence, it was selected as a potential hair loss treatment drug. SIGNIFICANCE This study aims to develop and optimize (Ca-RUV) loaded squarticles (SQRs) and assess their ability to deliver and release Ca-RUV in the hair follicle for the promotion of hair growth. METHODS A response surface design was utilized to study the effect of varying Pluronic® F68 (PF68) and the percentage of liquid lipids within the core of the SQRs and the effects of particle size, entrapment efficiency, and drug released percentage after 24 h (%Q24) were assessed. The optimized formula was subjected to DSC, XRD, and in-vivo evaluation in rats. RESULTS SQRs stabilized by 0.8% PF68 and contained 37.5% liquid lipids showed an acceptable particle size (250 nm), drug entrapment efficiency (75%), and %Q24 (100%). The in-vivo studies illustrated the ability of the formula to regrow hair in animals after 10 days due to the elevation of the vascular endothelial growth factor (VEGF) and insulin-like growth factor 1 (IGF-1) to their normal values and by 9% and 54%, respectively, relative to standard therapy minoxidil (5%). CONCLUSION Thus, it can be concluded that the optimized formula of Ca-RUV loaded SQRs showed superior in-vivo results in the promotion of hair growth in a shorter period relative to the marketed product. Therefore, the formula can offer a viable option for the treatment of hair loss.
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Affiliation(s)
- Mervat Shafik Ibrahim
- Department of Pharmaceutics and Industrial Pharmacy, October University for Modern Sciences and Arts (MSA), Cairo, Egypt
| | - Nihal Mohamed Elmahdy Elsayyad
- Department of Pharmaceutics and Industrial Pharmacy, October University for Modern Sciences and Arts (MSA), Cairo, Egypt
| | - Abeer Salama
- Pharmacology Department, National Research Centre, Dokki, Cairo, Egypt
| | - Shereen H Noshi
- Department of Pharmaceutics and Industrial Pharmacy, October University for Modern Sciences and Arts (MSA), Cairo, Egypt
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Zhao B, Tang Y, Chen W, Wan H, Yang J, Chen X. A novel homozygous mutation in LSS gene possibly causes hypotrichosis simplex in two siblings of a Tibetan family from the western Sichuan province of China. Front Physiol 2023; 13:992190. [PMID: 36685177 PMCID: PMC9859656 DOI: 10.3389/fphys.2022.992190] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2022] [Accepted: 12/09/2022] [Indexed: 01/09/2023] Open
Abstract
Aim: Hypotrichosis simplex (MIM 146520) is a rare form of monogenic hereditary alopecia. Several genes have been identified as being associated with the disease, including LPAR6, LIPH, and DSG4. LSS encoding lanosterol synthase (LSS) has been shown to cause hypotrichosis simplex, but the related mechanisms have not been elucidated to date. This study aims to find mutations in LSS from a Chinese family, among which a 21-year-old male patient and his 9-year-old sister were affected by hypotrichosis simplex. Methods: Dermoscopy and histological analysis were used to examine patients' scalps, while exome sequencing was used to find the mutations in LSS. Results: The hair loss was only detected on the scalp of the proband and his sister, while other ectodermal structures were normal with no systemic abnormalities. Further, the exome sequencing identified a new homozygous mutation NM_002340.6 (LSS_v001):c.812T>C (p.(Ile271Thr)) in the LSS gene of the proband, which was also found in his sister. In addition, a heterozygous mutation of LSS was found in their asymptomatic parents. Finally, the possible protein structure of the mutational LSS was predicted. Conclusion: The hypotrichosis simplex reported here could be an autosomal recessive disease in this family. The mutation on LSS might reduce the enzyme activity of LSS, thus leading to the disease.
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Affiliation(s)
- Bei Zhao
- Institute of Dermatology and Venereology, Sichuan Academy of Medical Sciences and Sichuan Provincial People’s Hospital, Chengdu, China,School of Medicine, University of Electronic Science and Technology of China, Chengdu, China
| | - Yisi Tang
- School of Medicine, University of Electronic Science and Technology of China, Chengdu, China
| | - Wenjing Chen
- School of Medicine, University of Electronic Science and Technology of China, Chengdu, China
| | - Huiying Wan
- Institute of Dermatology and Venereology, Sichuan Academy of Medical Sciences and Sichuan Provincial People’s Hospital, Chengdu, China,School of Medicine, University of Electronic Science and Technology of China, Chengdu, China
| | - Jiyun Yang
- Medical Genetics Center, Sichuan Academy of Medical Sciences and Sichuan Provincial People’s Hospital, Chengdu, China
| | - Xuejun Chen
- Institute of Dermatology and Venereology, Sichuan Academy of Medical Sciences and Sichuan Provincial People’s Hospital, Chengdu, China,School of Medicine, University of Electronic Science and Technology of China, Chengdu, China,*Correspondence: Xuejun Chen,
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Pathave H, Desai S, Syiemlieh A, Nayak C. Madarosis in a normolipidemic woman: Is giant xanthelasma palpebrarum the culprit? JOURNAL OF DERMATOLOGY & DERMATOLOGIC SURGERY 2022. [DOI: 10.4103/jdds.jdds_108_20] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022] Open
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Danyukova T, Schöneck K, Pohl S. Site-1 and site-2 proteases: A team of two in regulated proteolysis. BIOCHIMICA ET BIOPHYSICA ACTA-MOLECULAR CELL RESEARCH 2021; 1869:119138. [PMID: 34619164 DOI: 10.1016/j.bbamcr.2021.119138] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/24/2021] [Revised: 08/12/2021] [Accepted: 09/06/2021] [Indexed: 12/19/2022]
Abstract
The site-1 and site-2 proteases (S1P and S2P) were identified over 20 years ago, and the functions of both have been addressed in numerous studies ever since. Whereas S1P processes a set of substrates independently of S2P, the latter acts in concert with S1P in a mechanism, called regulated intramembrane proteolysis, that controls lipid metabolism and response to unfolded proteins. This review summarizes the molecular roles that S1P and S2P jointly play in these processes. As S1P and S2P deficiencies mainly affect connective tissues, yet with varying phenotypes, we discuss the segregated functions of S1P and S2P in terms of cell homeostasis and maintenance of the connective tissues. In addition, we provide experimental data that point at S2P, but not S1P, as a critical regulator of cell adaptation to proteotoxicity or lipid imbalance. Therefore, we hypothesize that S2P can also function independently of S1P activity.
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Affiliation(s)
- Tatyana Danyukova
- Department of Osteology and Biomechanics, University Medical Center Hamburg-Eppendorf, Martinistrasse 52, 20246 Hamburg, Germany.
| | - Kenneth Schöneck
- Department of Osteology and Biomechanics, University Medical Center Hamburg-Eppendorf, Martinistrasse 52, 20246 Hamburg, Germany
| | - Sandra Pohl
- Department of Osteology and Biomechanics, University Medical Center Hamburg-Eppendorf, Martinistrasse 52, 20246 Hamburg, Germany
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Zhang X, Zhao H, Sheng Q, Liu X, You W, Lin H, Liu G. Regulation of microRNA-33, SREBP and ABCA1 genes in a mouse model of high cholesterol. Arch Anim Breed 2021; 64:103-108. [PMID: 34084908 PMCID: PMC8160998 DOI: 10.5194/aab-64-103-2021] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2020] [Accepted: 02/16/2021] [Indexed: 11/11/2022] Open
Abstract
MicroRNAs are short non-coding RNAs that regulate gene expression. Several microRNAs, useful for coronary artery disease assessment, have previously been identified. MicroRNA-33 is located within SREBP introns and controls cholesterol homeostasis. In order to find the possibility of microRNA-33 as a potential biomarker in high cholesterol disease, we developed a mouse model for coronary heart disease by feeding mice with a high-fat diet. The expression differences of microRNA-33, SREBP and ABCA1 genes in the liver, muscle, and lipid tissues were compared between a high-cholesterol group and control group in mice. The results showed that ABCA1 was up-regulated by high cholesterol conditions in liver, muscle and lipid tissues. SREBP1C was up-regulated by high cholesterol conditions in the liver and lipid tissues and down-regulated by high cholesterol conditions in the muscle tissue. MicroRNA-33 and SREBP2 were down-regulated by high cholesterol conditions in the liver and muscle tissues and up-regulated by high cholesterol conditions in the lipid tissue. Our study suggests that antisense therapeutic targeting of microRNA-33 may be a potential biomarker for cardiovascular disease.
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Affiliation(s)
- Xianglun Zhang
- Institute of Animal Science and Veterinary Medicine, Shandong Academy of Agricultural Sciences, Jinan, China.,Shandong Key Lab of Animal Disease Control and Breeding, Jinan, China
| | - Hongbo Zhao
- Institute of Animal Science and Veterinary Medicine, Shandong Academy of Agricultural Sciences, Jinan, China.,Shandong Key Lab of Animal Disease Control and Breeding, Jinan, China
| | - Qingkai Sheng
- Institute of Animal Science and Veterinary Medicine, Shandong Academy of Agricultural Sciences, Jinan, China.,Shandong Key Lab of Animal Disease Control and Breeding, Jinan, China
| | - Xiaomu Liu
- Institute of Animal Science and Veterinary Medicine, Shandong Academy of Agricultural Sciences, Jinan, China.,Shandong Key Lab of Animal Disease Control and Breeding, Jinan, China
| | - Wei You
- Institute of Animal Science and Veterinary Medicine, Shandong Academy of Agricultural Sciences, Jinan, China.,Shandong Key Lab of Animal Disease Control and Breeding, Jinan, China
| | - Haichao Lin
- Institute of Animal Science and Veterinary Medicine, Shandong Academy of Agricultural Sciences, Jinan, China.,Shandong Key Lab of Animal Disease Control and Breeding, Jinan, China
| | - Guifen Liu
- Institute of Animal Science and Veterinary Medicine, Shandong Academy of Agricultural Sciences, Jinan, China.,Shandong Key Lab of Animal Disease Control and Breeding, Jinan, China
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Cho WK, Kim HI, Paek SH, Kim SY, Hyun Seo H, Song J, Lee OH, Min J, Lee SJ, Jo Y, Choi H, Lee JH, Moh SH. Gene expression profile of human follicle dermal papilla cells in response to Camellia japonica phytoplacenta extract. FEBS Open Bio 2021; 11:633-651. [PMID: 33410284 PMCID: PMC7931240 DOI: 10.1002/2211-5463.13076] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2020] [Revised: 12/20/2020] [Accepted: 12/21/2020] [Indexed: 12/19/2022] Open
Abstract
Camellia japonica L. is a flowering tree with several medicinal and cosmetic applications. Here, we investigated the efficacy of C. japonica placenta extract (CJPE) as a potential therapeutic agent for promotion of hair growth and scalp health by using various in vitro and in vivo assays. Moreover, we performed transcriptome analysis to examine the relative expression of human follicle dermal papilla cells (HFDPC) in response to CJPE by RNA-sequencing (RNA-seq). In vitro assays revealed upregulation of the expression of hair growth marker genes in HFDPC after CJPE treatment. Moreover, in vivo clinical tests with 42 adult female participants showed that a solution containing 0.5% CJPE increased the moisture content of the scalp and decreased the scalp's sebum content, dead scalp keratin, and erythema. Furthermore, RNA-seq analysis revealed key genes in HFDPC which are associated with CJPE. Interestingly, genes associated with lipid metabolism and cholesterol efflux were upregulated. Genes upregulated by CJPE are associated with several hormones, including parathyroid, adrenocorticotropic hormone, α-melanocyte-stimulating hormone (alpha-MSH), and norepinephrine, which are involved in hair follicle biology. Furthermore, some upregulated genes are associated with the regulation of axon guidance. In contrast, many genes downregulated by CJPE are associated with structural components of the cytoskeleton. In addition, CJPE suppressed genes associated with muscle structure and development. Taken together, this study provides extensive evidence that CJPE may have potential as a therapeutic agent for scalp treatment and hair growth promotion.
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Affiliation(s)
- Won Kyong Cho
- Research Institute of Agriculture and Life Sciences, College of Agriculture and Life Sciences, Seoul National University, Korea
| | - Hye-In Kim
- Anti-aging Research Institute of BIO-FD&C Co., Ltd., Incheon, Korea
| | - Seung Hye Paek
- Anti-aging Research Institute of BIO-FD&C Co., Ltd., Incheon, Korea
| | - Soo-Yun Kim
- Anti-aging Research Institute of BIO-FD&C Co., Ltd., Incheon, Korea
| | - Hyo Hyun Seo
- Anti-aging Research Institute of BIO-FD&C Co., Ltd., Incheon, Korea
| | - Jihyeok Song
- Anti-aging Research Institute of BIO-FD&C Co., Ltd., Incheon, Korea
| | - Ok Hwa Lee
- Anti-aging Research Institute of BIO-FD&C Co., Ltd., Incheon, Korea
| | - Jiae Min
- Anti-aging Research Institute of BIO-FD&C Co., Ltd., Incheon, Korea
| | - Sang Jun Lee
- Anti-aging Research Institute of BIO-FD&C Co., Ltd., Incheon, Korea
| | - Yeonhwa Jo
- Research Institute of Agriculture and Life Sciences, College of Agriculture and Life Sciences, Seoul National University, Korea
| | - Hoseong Choi
- Research Institute of Agriculture and Life Sciences, College of Agriculture and Life Sciences, Seoul National University, Korea
| | - Jeong Hun Lee
- Anti-aging Research Institute of BIO-FD&C Co., Ltd., Incheon, Korea
| | - Sang Hyun Moh
- Anti-aging Research Institute of BIO-FD&C Co., Ltd., Incheon, Korea
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Localisation and regulation of cholesterol transporters in the human hair follicle: mapping changes across the hair cycle. Histochem Cell Biol 2021; 155:529-545. [PMID: 33404706 PMCID: PMC8134313 DOI: 10.1007/s00418-020-01957-8] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 12/10/2020] [Indexed: 02/06/2023]
Abstract
Cholesterol has long been suspected of influencing hair biology, with dysregulated homeostasis implicated in several disorders of hair growth and cycling. Cholesterol transport proteins play a vital role in the control of cellular cholesterol levels and compartmentalisation. This research aimed to determine the cellular localisation, transport capability and regulatory control of cholesterol transport proteins across the hair cycle. Immunofluorescence microscopy in human hair follicle sections revealed differential expression of ATP-binding cassette (ABC) transporters across the hair cycle. Cholesterol transporter expression (ABCA1, ABCG1, ABCA5 and SCARB1) reduced as hair follicles transitioned from growth to regression. Staining for free cholesterol (filipin) revealed prominent cholesterol striations within the basement membrane of the hair bulb. Liver X receptor agonism demonstrated active regulation of ABCA1 and ABCG1, but not ABCA5 or SCARB1 in human hair follicles and primary keratinocytes. These results demonstrate the capacity of human hair follicles for cholesterol transport and trafficking. Future studies examining the role of cholesterol transport across the hair cycle may shed light on the role of lipid homeostasis in human hair disorders.
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Maged A, Mahmoud AA, Salah S, Abd-elmonsif NM, Ghorab MM. Spray-Dried Rosuvastatin Nanoparticles for Promoting Hair Growth. AAPS PharmSciTech 2020; 21:205. [PMID: 32715367 DOI: 10.1208/s12249-020-01746-5] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2020] [Accepted: 07/05/2020] [Indexed: 01/17/2023] Open
Abstract
In this research, we examined the effect of rosuvastatin calcium-loaded nanoparticles on the hair growth-promoting activity on Albino rats. Nanoparticles were prepared using 2:1 weight ratio of drug to methyl-β-cyclodextrin with 10, 20, and 30% stabilizers (phospholipid, polyvinyl pyrrolidone K30, and Compritol 888 ATO) using nanospray dryer. Subsequently, the prepared nanoparticles were evaluated for their process yield, particle size, polydispersity index, zeta potential, and in vitro drug release as well as in vivo studies. The dried nanoparticles showed process yield values up to 84% with particle size values ranging from 218 to 6258 nm, polydispersity index values ranging from 0.32 to 0.99, and zeta potential values ranging from - 6.1 to - 11.9 mV. Combination of methyl-β-cyclodextrin with 10% polyvinyl pyrrolidone K30 accomplished nanoparticles with the lowest particle size (218 nm) and polydispersity index (0.32) values. These nanoparticles had suitable process yield value (70.5%) and were able to retard drug release. The hair growth-promoting activity for the selected nanoparticles revealed the highest hair length values in Albino rats after 14 days of the hair growth study compared with non-medicated nanoparticles, nanoparticles' physical mixture, rosuvastatin solution, and marketed minoxidil preparation groups as well as the control group. The immunohistochemistry images for both selected nanoparticles and marketed minoxidil groups showed a significant increase in the diameter of hair follicle and percent area fraction of cytokeratin 19 in the outer root sheath of hair follicle compared with other tested groups. Rosuvastatin nanoparticles prepared by nanospray drying technique could be a good competitor to minoxidil for hair growth-promoting activity. Graphical abstract.
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Wang H, Humbatova A, Liu Y, Qin W, Lee M, Cesarato N, Kortüm F, Kumar S, Romano MT, Dai S, Mo R, Sivalingam S, Motameny S, Wu Y, Wang X, Niu X, Geng S, Bornholdt D, Kroisel PM, Tadini G, Walter SD, Hauck F, Girisha KM, Calza AM, Bottani A, Altmüller J, Buness A, Yang S, Sun X, Ma L, Kutsche K, Grzeschik KH, Betz RC, Lin Z. Mutations in SREBF1, Encoding Sterol Regulatory Element Binding Transcription Factor 1, Cause Autosomal-Dominant IFAP Syndrome. Am J Hum Genet 2020; 107:34-45. [PMID: 32497488 DOI: 10.1016/j.ajhg.2020.05.006] [Citation(s) in RCA: 25] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2020] [Accepted: 05/04/2020] [Indexed: 12/14/2022] Open
Abstract
IFAP syndrome is a rare genetic disorder characterized by ichthyosis follicularis, atrichia, and photophobia. Previous research found that mutations in MBTPS2, encoding site-2-protease (S2P), underlie X-linked IFAP syndrome. The present report describes the identification via whole-exome sequencing of three heterozygous mutations in SREBF1 in 11 unrelated, ethnically diverse individuals with autosomal-dominant IFAP syndrome. SREBF1 encodes sterol regulatory element-binding protein 1 (SREBP1), which promotes the transcription of lipogenes involved in the biosynthesis of fatty acids and cholesterols. This process requires cleavage of SREBP1 by site-1-protease (S1P) and S2P and subsequent translocation into the nucleus where it binds to sterol regulatory elements (SRE). The three detected SREBF1 mutations caused substitution or deletion of residues 527, 528, and 530, which are crucial for S1P cleavage. In vitro investigation of SREBP1 variants demonstrated impaired S1P cleavage, which prohibited nuclear translocation of the transcriptionally active form of SREBP1. As a result, SREBP1 variants exhibited significantly lower transcriptional activity compared to the wild-type, as demonstrated via luciferase reporter assay. RNA sequencing of the scalp skin from IFAP-affected individuals revealed a dramatic reduction in transcript levels of low-density lipoprotein receptor (LDLR) and of keratin genes known to be expressed in the outer root sheath of hair follicles. An increased rate of in situ keratinocyte apoptosis, which might contribute to skin hyperkeratosis and hypotrichosis, was also detected in scalp samples from affected individuals. Together with previous research, the present findings suggest that SREBP signaling plays an essential role in epidermal differentiation, skin barrier formation, hair growth, and eye function.
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Affiliation(s)
- Huijun Wang
- Department of Dermatology, Peking University First Hospital, Beijing Key Laboratory of Molecular Diagnosis on Dermatoses, National Clinical Research Center for Skin and Immune Diseases, Beijing 100034, China
| | - Aytaj Humbatova
- Institute of Human Genetics, University of Bonn, Medical Faculty & University Hospital Bonn, 53127 Bonn, Germany
| | - Yuanxiang Liu
- Department of Dermatology, Beijing Children's Hospital, Capital Medical University, National Center for Children's Health, Beijing 100045, China
| | - Wen Qin
- Department of Dermatology, Peking University First Hospital, Beijing Key Laboratory of Molecular Diagnosis on Dermatoses, National Clinical Research Center for Skin and Immune Diseases, Beijing 100034, China
| | - Mingyang Lee
- Department of Dermatology, Peking University First Hospital, Beijing Key Laboratory of Molecular Diagnosis on Dermatoses, National Clinical Research Center for Skin and Immune Diseases, Beijing 100034, China
| | - Nicole Cesarato
- Institute of Human Genetics, University of Bonn, Medical Faculty & University Hospital Bonn, 53127 Bonn, Germany
| | - Fanny Kortüm
- Institute of Human Genetics, University Medical Center Hamburg-Eppendorf, 20246 Hamburg, Germany
| | - Sheetal Kumar
- Institute of Human Genetics, University of Bonn, Medical Faculty & University Hospital Bonn, 53127 Bonn, Germany
| | - Maria Teresa Romano
- Institute of Human Genetics, University of Bonn, Medical Faculty & University Hospital Bonn, 53127 Bonn, Germany
| | - Shangzhi Dai
- Department of Dermatology, Peking University First Hospital, Beijing Key Laboratory of Molecular Diagnosis on Dermatoses, National Clinical Research Center for Skin and Immune Diseases, Beijing 100034, China
| | - Ran Mo
- Department of Dermatology, Peking University First Hospital, Beijing Key Laboratory of Molecular Diagnosis on Dermatoses, National Clinical Research Center for Skin and Immune Diseases, Beijing 100034, China
| | - Sugirthan Sivalingam
- Institute for Medical Biometry, Informatics and Epidemiology, University of Bonn, Medical Faculty, 53127 Bonn, Germany; Institute for Genomic Statistics and Bioinformatics, University of Bonn, Medical Faculty, 53127 Bonn, Germany
| | - Susanne Motameny
- Cologne Center for Genomics, University of Cologne, 50931 Cologne, Germany
| | - Yuan Wu
- Department of Ophthalmology, Peking University First Hospital, Beijing 100034, China
| | - Xiaopeng Wang
- Department of Dermatology, The Second Affiliated Hospital of Xi'an Jiaotong University, Xi'an 710004, China
| | - Xinwu Niu
- Department of Dermatology, The Second Affiliated Hospital of Xi'an Jiaotong University, Xi'an 710004, China
| | - Songmei Geng
- Department of Dermatology, The Second Affiliated Hospital of Xi'an Jiaotong University, Xi'an 710004, China
| | - Dorothea Bornholdt
- Centre for Human Genetics, University of Marburg, 35033 Marburg, Germany
| | - Peter M Kroisel
- Institute of Human Genetics, Medical University of Graz, 8010 Graz, Austria
| | - Gianluca Tadini
- Pediatric Dermatology Unit, Department of Pathophysiology and Transplantation, Fondazione IRCCS Ca' Granda - Ospedale Maggiore Policlinico, University of Milan, Milan, Italy
| | - Scott D Walter
- Retina Consultants, P.C., 43 Woodland Street, Suite 100, Hartford, CT 06105, USA
| | - Fabian Hauck
- Department of Pediatrics, University Hospital Carl Gustav Carus, TU Dresden, 01307 Dresden, Germany; Department of Pediatrics, Dr. von Hauner Children's Hospital, University Hospital, Ludwig-Maximilians-Universität München, Munich, Germany
| | - Katta M Girisha
- Department of Medical Genetics, Kasturba Medical College, Manipal Academy of Higher Education, Manipal, Karnataka, India
| | - Anne-Marie Calza
- Department of Dermatology and Venereology, Geneva University Hospitals, 1205 Geneva, Switzerland
| | - Armand Bottani
- Service of Genetic Medicine, Geneva University Hospitals, 1205 Geneva, Switzerland
| | - Janine Altmüller
- Cologne Center for Genomics, University of Cologne, 50931 Cologne, Germany
| | - Andreas Buness
- Institute for Medical Biometry, Informatics and Epidemiology, University of Bonn, Medical Faculty, 53127 Bonn, Germany; Institute for Genomic Statistics and Bioinformatics, University of Bonn, Medical Faculty, 53127 Bonn, Germany
| | - Shuxia Yang
- Department of Dermatology, Peking University First Hospital, Beijing Key Laboratory of Molecular Diagnosis on Dermatoses, National Clinical Research Center for Skin and Immune Diseases, Beijing 100034, China
| | - Xiujuan Sun
- Department of Dermatology, Beijing Children's Hospital, Capital Medical University, National Center for Children's Health, Beijing 100045, China
| | - Lin Ma
- Department of Dermatology, Beijing Children's Hospital, Capital Medical University, National Center for Children's Health, Beijing 100045, China
| | - Kerstin Kutsche
- Institute of Human Genetics, University Medical Center Hamburg-Eppendorf, 20246 Hamburg, Germany
| | | | - Regina C Betz
- Institute of Human Genetics, University of Bonn, Medical Faculty & University Hospital Bonn, 53127 Bonn, Germany.
| | - Zhimiao Lin
- Department of Dermatology, Peking University First Hospital, Beijing Key Laboratory of Molecular Diagnosis on Dermatoses, National Clinical Research Center for Skin and Immune Diseases, Beijing 100034, China.
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12
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Wada Y, Kikuchi A, Kaga A, Shimizu N, Ito J, Onuma R, Fujishima F, Totsune E, Sato R, Niihori T, Shirota M, Funayama R, Sato K, Nakazawa T, Nakayama K, Aoki Y, Aiba S, Nakagawa K, Kure S. Metabolic and pathologic profiles of human LSS deficiency recapitulated in mice. PLoS Genet 2020; 16:e1008628. [PMID: 32101538 PMCID: PMC7062289 DOI: 10.1371/journal.pgen.1008628] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2019] [Revised: 03/09/2020] [Accepted: 01/26/2020] [Indexed: 11/18/2022] Open
Abstract
Skin lesions, cataracts, and congenital anomalies have been frequently associated with inherited deficiencies in enzymes that synthesize cholesterol. Lanosterol synthase (LSS) converts (S)-2,3-epoxysqualene to lanosterol in the cholesterol biosynthesis pathway. Biallelic mutations in LSS have been reported in families with congenital cataracts and, very recently, have been reported in cases of hypotrichosis. However, it remains to be clarified whether these phenotypes are caused by LSS enzymatic deficiencies in each tissue, and disruption of LSS enzymatic activity in vivo has not yet been validated. We identified two patients with novel biallelic LSS mutations who exhibited congenital hypotrichosis and midline anomalies but did not have cataracts. We showed that the blockade of the LSS enzyme reaction occurred in the patients by measuring the (S)-2,3-epoxysqualene/lanosterol ratio in the forehead sebum, which would be a good biomarker for the diagnosis of LSS deficiency. Epidermis-specific Lss knockout mice showed neonatal lethality due to dehydration, indicating that LSS could be involved in skin barrier integrity. Tamoxifen-induced knockout of Lss in the epidermis caused hypotrichosis in adult mice. Lens-specific Lss knockout mice had cataracts. These results confirmed that LSS deficiency causes hypotrichosis and cataracts due to loss-of-function mutations in LSS in each tissue. These mouse models will lead to the elucidation of the pathophysiological mechanisms associated with disrupted LSS and to the development of therapeutic treatments for LSS deficiency.
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Affiliation(s)
- Yoichi Wada
- Department of Pediatrics, Tohoku University Graduate School of Medicine, Sendai, Miyagi, Japan
| | - Atsuo Kikuchi
- Department of Pediatrics, Tohoku University Graduate School of Medicine, Sendai, Miyagi, Japan
- * E-mail:
| | - Akimune Kaga
- Department of Pediatrics, Tohoku Kosai Hospital, Sendai, Miyagi, Japan
| | - Naoki Shimizu
- Food and Biodynamic Chemistry Laboratory, Graduate School of Agricultural Science, Tohoku University, Sendai, Miyagi, Japan
| | - Junya Ito
- Food and Biodynamic Chemistry Laboratory, Graduate School of Agricultural Science, Tohoku University, Sendai, Miyagi, Japan
| | - Ryo Onuma
- Food and Biodynamic Chemistry Laboratory, Graduate School of Agricultural Science, Tohoku University, Sendai, Miyagi, Japan
| | - Fumiyoshi Fujishima
- Department of Anatomic Pathology, Tohoku University Graduate School of Medicine, Sendai, Miyagi, Japan
| | - Eriko Totsune
- Department of Pediatrics, Tohoku University Graduate School of Medicine, Sendai, Miyagi, Japan
| | - Ryo Sato
- Department of Pediatrics, Tohoku University Graduate School of Medicine, Sendai, Miyagi, Japan
| | - Tetsuya Niihori
- Department of Medical Genetics, Tohoku University Graduate School of Medicine, Sendai, Miyagi, Japan
| | - Matsuyuki Shirota
- Division of Interdisciplinary Medical Sciences, United Centers for Advanced Research and Translational Medicine, Tohoku University Graduate School of Medicine, Sendai, Miyagi, Japan
| | - Ryo Funayama
- Division of Cell Proliferation, United Centers for Advanced Research and Translational Medicine, Tohoku University Graduate School of Medicine, Sendai, Miyagi, Japan
| | - Kota Sato
- Department of Ophthalmology, Tohoku University Graduate School of Medicine, Sendai, Miyagi, Japan
- Collaborative Program for Ophthalmic Drug Discovery, Tohoku University Graduate School of Medicine, Sendai, Miyagi, Japan
| | - Toru Nakazawa
- Department of Ophthalmology, Tohoku University Graduate School of Medicine, Sendai, Miyagi, Japan
- Collaborative Program for Ophthalmic Drug Discovery, Tohoku University Graduate School of Medicine, Sendai, Miyagi, Japan
- Department of Retinal Disease Control, Tohoku University Graduate School of Medicine, Sendai, Miyagi, Japan
- Department of Advanced Ophthalmic Medicine, Tohoku University Graduate School of Medicine, Sendai, Miyagi, Japan
- Department of Ophthalmic Imaging and Information Analytics, Tohoku University Graduate School of Medicine, Sendai, Miyagi, Japan
| | - Keiko Nakayama
- Division of Cell Proliferation, United Centers for Advanced Research and Translational Medicine, Tohoku University Graduate School of Medicine, Sendai, Miyagi, Japan
| | - Yoko Aoki
- Department of Medical Genetics, Tohoku University Graduate School of Medicine, Sendai, Miyagi, Japan
| | - Setsuya Aiba
- Department of Dermatology, Tohoku University Graduate School of Medicine, Sendai, Miyagi, Japan
| | - Kiyotaka Nakagawa
- Food and Biodynamic Chemistry Laboratory, Graduate School of Agricultural Science, Tohoku University, Sendai, Miyagi, Japan
| | - Shigeo Kure
- Department of Pediatrics, Tohoku University Graduate School of Medicine, Sendai, Miyagi, Japan
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13
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Suzuki T, Kikuguchi C, Nishijima S, Yamamoto T. Insufficient liver maturation affects murine early postnatal hair cycle. Biochem Biophys Res Commun 2020; 521:172-177. [PMID: 31630801 DOI: 10.1016/j.bbrc.2019.10.099] [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: 09/27/2019] [Accepted: 10/11/2019] [Indexed: 11/25/2022]
Abstract
Abnormal hair loss results from a variety of factors, such as metabolic dysfunctions, immunodeficiency, and environmental stressors. Here, we report that mutant mice having defects in liver function, develop alopecia. We have shown previously that in mice lacking a Cnot3 gene, which encodes an essential component of the CCR4-NOT deadenylase complex in liver (Cnot3-LKO mice), the liver does not mature properly, resulting in various pathologies such as hepatitis, hepatic necrosis, and anemia. Unexpectedly, Cnot3-LKO mice start to lose hair around postnatal day 17 (P17). The region of hair loss expands all across their backs and symptoms persist until around P28-30. Afterward, hair re-grows, and Cnot3-LKO mice show complete hair recovery by P40. The phenotype is dependent on mouse genotype, indicating that hair follicle morphogenesis and cycling are influenced by abnormal liver development. By performing histological, quantitative PCR, and immunoblot analyses, we detected sebaceous gland (SG) hypertrophy accompanied by an increase of peroxisome proliferator-activated receptor γ (PPARγ). Collectively, these findings suggest that paracrine signaling related to liver function influences hair growth, at least in part, by altering lipid metabolism.
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Affiliation(s)
- Toru Suzuki
- Laboratory for Immunogenetics, Center for Integrative Medical Sciences, RIKEN, 1-7-22, Suehiro-cho, Yokohama, 230-0045, Japan.
| | - Chisato Kikuguchi
- Laboratory for Immunogenetics, Center for Integrative Medical Sciences, RIKEN, 1-7-22, Suehiro-cho, Yokohama, 230-0045, Japan
| | - Saori Nishijima
- Cell Signal Unit, Okinawa Institute of Science and Technology, 1919-1 Onna-son, Kunigami-gun, Okinawa, 904-0495, Japan
| | - Tadashi Yamamoto
- Laboratory for Immunogenetics, Center for Integrative Medical Sciences, RIKEN, 1-7-22, Suehiro-cho, Yokohama, 230-0045, Japan; Cell Signal Unit, Okinawa Institute of Science and Technology, 1919-1 Onna-son, Kunigami-gun, Okinawa, 904-0495, Japan.
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14
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Palmer MA, Blakeborough L, Harries M, Haslam IS. Cholesterol homeostasis: Links to hair follicle biology and hair disorders. Exp Dermatol 2019; 29:299-311. [PMID: 31260136 DOI: 10.1111/exd.13993] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2019] [Revised: 05/24/2019] [Accepted: 06/19/2019] [Indexed: 01/10/2023]
Abstract
Lipids and lipid metabolism are critical factors in hair follicle (HF) biology, and cholesterol has long been suspected of influencing hair growth. Altered cholesterol homeostasis is involved in the pathogenesis of primary cicatricial alopecia, mutations in a cholesterol transporter are associated with congenital hypertrichosis, and dyslipidaemia has been linked to androgenic alopecia. The underlying molecular mechanisms by which cholesterol influences pathways involved in proliferation and differentiation within HF cell populations remain largely unknown. As such, expanding our knowledge of the role for cholesterol in regulating these processes is likely to provide new leads in the development of treatments for disorders of hair growth and cycling. This review describes the current state of knowledge with respect to cholesterol homeostasis in the HF along with known and putative links to hair pathologies.
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Affiliation(s)
- Megan A Palmer
- School of Applied Sciences, Department of Biological and Geographical Sciences, University of Huddersfield, Huddersfield, UK
| | - Liam Blakeborough
- School of Applied Sciences, Department of Biological and Geographical Sciences, University of Huddersfield, Huddersfield, UK
| | - Matthew Harries
- Salford Royal NHS Foundation Trust, Manchester Academic Health Science Centre, Manchester, UK.,Musculoskeletal and Dermatological Sciences, School of Biological Sciences, Faculty of Biology, Medicine and Health, University of Manchester, Manchester, UK
| | - Iain S Haslam
- School of Applied Sciences, Department of Biological and Geographical Sciences, University of Huddersfield, Huddersfield, UK
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15
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Jo Y, Hamilton JS, Hwang S, Garland K, Smith GA, Su S, Fuentes I, Neelam S, Thompson BM, McDonald JG, DeBose-Boyd RA. Schnyder corneal dystrophy-associated UBIAD1 inhibits ER-associated degradation of HMG CoA reductase in mice. eLife 2019; 8:44396. [PMID: 30785396 PMCID: PMC6402834 DOI: 10.7554/elife.44396] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2018] [Accepted: 02/19/2019] [Indexed: 12/14/2022] Open
Abstract
Autosomal-dominant Schnyder corneal dystrophy (SCD) is characterized by corneal opacification owing to overaccumulation of cholesterol. SCD is caused by mutations in UBIAD1, which utilizes geranylgeranyl pyrophosphate (GGpp) to synthesize vitamin K2. Using cultured cells, we previously showed that sterols trigger binding of UBIAD1 to the cholesterol biosynthetic enzyme HMG CoA reductase (HMGCR), thereby inhibiting its endoplasmic reticulum (ER)-associated degradation (ERAD) (Schumacher et al. 2015). GGpp triggers release of UBIAD1 from HMGCR, allowing maximal ERAD and ER-to-Golgi transport of UBIAD1. SCD-associated UBIAD1 resists GGpp-induced release and is sequestered in ER to inhibit ERAD. We now report knockin mice expressing SCD-associated UBIAD1 accumulate HMGCR in several tissues resulting from ER sequestration of mutant UBIAD1 and inhibition of HMGCR ERAD. Corneas from aged knockin mice exhibit signs of opacification and sterol overaccumulation. These results establish the physiological significance of UBIAD1 in cholesterol homeostasis and indicate inhibition of HMGCR ERAD contributes to SCD pathogenesis.
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Affiliation(s)
- Youngah Jo
- Departments of Molecular Genetics, Center for Human Nutrition, University of Texas Southwestern Medical Center, Dallas, United States
| | - Jason S Hamilton
- Departments of Molecular Genetics, Center for Human Nutrition, University of Texas Southwestern Medical Center, Dallas, United States
| | - Seonghwan Hwang
- Departments of Molecular Genetics, Center for Human Nutrition, University of Texas Southwestern Medical Center, Dallas, United States
| | - Kristina Garland
- Departments of Molecular Genetics, Center for Human Nutrition, University of Texas Southwestern Medical Center, Dallas, United States
| | - Gennipher A Smith
- Departments of Molecular Genetics, Center for Human Nutrition, University of Texas Southwestern Medical Center, Dallas, United States
| | - Shan Su
- Departments of Molecular Genetics, Center for Human Nutrition, University of Texas Southwestern Medical Center, Dallas, United States
| | - Iris Fuentes
- Departments of Molecular Genetics, Center for Human Nutrition, University of Texas Southwestern Medical Center, Dallas, United States
| | - Sudha Neelam
- Department of Ophthalmology, Center for Human Nutrition, University of Texas Southwestern Medical Center, Dallas, United States
| | - Bonne M Thompson
- Center for Human Nutrition, University of Texas Southwestern Medical Center, Dallas, United States
| | - Jeffrey G McDonald
- Center for Human Nutrition, University of Texas Southwestern Medical Center, Dallas, United States
| | - Russell A DeBose-Boyd
- Departments of Molecular Genetics, Center for Human Nutrition, University of Texas Southwestern Medical Center, Dallas, United States
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16
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Lim CP, Severin RK, Petukhova L. Big Data Reveal Insights into Alopecia Areata Comorbidities. J Investig Dermatol Symp Proc 2019; 19:S57-S61. [PMID: 29273109 DOI: 10.1016/j.jisp.2017.10.006] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
Autoimmune diseases create a substantial burden of disease, and alopecia areata is among the more prevalent forms. Comorbidities are medical conditions that tend to occur together and may provide etiologic insights, suggest novel therapeutic strategies, and help patients and family members understand the risk of other health conditions. It is well established that having one autoimmune disease increases risk for others because of an underlying shared biology. Precision medicine initiatives are creating vast amounts of data that allow us to efficiently identify comorbidities. A survey across various datasets suggests that patients with autoimmune disease, and patients with alopecia areata in particular, may have comorbid neuropsychiatric and metabolic conditions.
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Affiliation(s)
- Chean Ping Lim
- Department of Epidemiology, Mailman School of Public Health, Columbia University, New York, New York, USA
| | - Rachel K Severin
- Department of Dermatology, College of Physicians and Surgeons, Columbia University, New York, New York, USA
| | - Lynn Petukhova
- Department of Epidemiology, Mailman School of Public Health, Columbia University, New York, New York, USA; Department of Dermatology, College of Physicians and Surgeons, Columbia University, New York, New York, USA.
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17
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Huynh H, Wei W, Wan Y. mTOR Inhibition Subdues Milk Disorder Caused by Maternal VLDLR Loss. Cell Rep 2018; 19:2014-2025. [PMID: 28591574 DOI: 10.1016/j.celrep.2017.05.037] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2016] [Revised: 04/14/2017] [Accepted: 05/10/2017] [Indexed: 01/01/2023] Open
Abstract
It is unknown whether and how very-low density lipoprotein receptors (VLDLRs) impact skeletal homeostasis. Here, we report that maternal and offspring VLDLRs play opposite roles in osteoclastogenesis and bone resorption. VLDLR deletion in the offspring augments osteoclast differentiation by enhancing RANKL signaling, leading to osteoporosis. In contrast, VLDLR deletion in the mother alters milk metabolism, which inhibits osteoclast differentiation and causes osteopetrosis in the offspring. The maternal effects are dominant. VLDLR-null lactating mammary gland exhibits higher mTORC1 signaling and cholesterol biosynthesis. Pharmacological probing reveals that rapamycin, but not statin, treatment of the VLDLR-null mother can prevent both the low bone resorption and our previously described inflammatory fur loss in their offspring. Genetic rescue reveals that maternal mTORC1 attenuation in adipocytes, but not in myeloid cells, prevents offspring osteopetrosis and fur loss. Our studies uncover functions of VLDLR and mTORC1 in lactation and osteoclastogenesis, illuminating key mechanisms and therapeutic insights for bone and metabolic diseases.
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Affiliation(s)
- HoangDinh Huynh
- Department of Pharmacology, The University of Texas Southwestern Medical Center, Dallas, TX 75390, USA
| | - Wei Wei
- Department of Pharmacology, The University of Texas Southwestern Medical Center, Dallas, TX 75390, USA
| | - Yihong Wan
- Department of Pharmacology, The University of Texas Southwestern Medical Center, Dallas, TX 75390, USA.
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18
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A comparison of transcriptomic patterns measured in the skin of Chinese fine and coarse wool sheep breeds. Sci Rep 2017; 7:14301. [PMID: 29085060 PMCID: PMC5662721 DOI: 10.1038/s41598-017-14772-4] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2017] [Accepted: 10/12/2017] [Indexed: 12/17/2022] Open
Abstract
We characterised wool traits, and skin gene expression profiles of fine wool Super Merino (SM) and coarse wool Small Tail Han (STH) sheep. SM sheep had a significantly higher total density of wool follicles, heavier fleeces, finer fibre diameter, and increased crimp frequency, staple length and wool grease (lanolin) production. We found 435 genes were expressed at significantly different levels in the skin of the two breeds (127 genes more highly in SM and 308 genes more highly in STH sheep). Classification of the genes more highly expressed in SM sheep revealed numerous lipid metabolic genes as well as genes encoding keratins, keratin-associated proteins, and wool follicle stem cell markers. In contrast, mammalian epidermal development complex genes and other genes associated with skin cornification and muscle function were more highly expressed in STH sheep. Genes identified in this study may be further evaluated for inclusion in breeding programs, or as targets for therapeutic or genetic interventions, aimed at altering wool quality or yield. Expression of the lipid metabolic genes in the skin of sheep may be used as a novel trait with the potential to alter the content or properties of lanolin or the fleece.
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19
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Engelking LJ, Cantoria MJ, Xu Y, Liang G. Developmental and extrahepatic physiological functions of SREBP pathway genes in mice. Semin Cell Dev Biol 2017; 81:98-109. [PMID: 28736205 DOI: 10.1016/j.semcdb.2017.07.011] [Citation(s) in RCA: 35] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2017] [Accepted: 07/07/2017] [Indexed: 12/17/2022]
Abstract
Sterol regulatory element-binding proteins (SREBPs), master transcriptional regulators of cholesterol and fatty acid synthesis, have been found to contribute to a diverse array of cellular processes. In this review, we focus on genetically engineered mice in which the activities of six components of the SREBP gene pathway, namely SREBP-1, SREBP-2, Scap, Insig-1, Insig-2, or Site-1 protease have been altered through gene knockout or transgenic approaches. In addition to the expected impacts on lipid metabolism, manipulation of these genes in mice is found to affect a wide array of developmental and physiologic processes ranging from interferon signaling in macrophages to synaptic transmission in the brain. The findings reviewed herein provide a blueprint to guide future studies defining the complex interactions between lipid biology and the physiologic processes of many distinct organ systems.
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Affiliation(s)
- Luke J Engelking
- Departments of Molecular Genetics, University of Texas Southwestern Medical Center, Dallas, TX, USA; Department of Internal Medicine, University of Texas Southwestern Medical Center, Dallas, TX, USA.
| | - Mary Jo Cantoria
- Departments of Molecular Genetics, University of Texas Southwestern Medical Center, Dallas, TX, USA
| | - Yanchao Xu
- Department of Internal Medicine, University of Texas Southwestern Medical Center, Dallas, TX, USA
| | - Guosheng Liang
- Departments of Molecular Genetics, University of Texas Southwestern Medical Center, Dallas, TX, USA.
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20
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Skin-specific regulation of SREBP processing and lipid biosynthesis by glycerol kinase 5. Proc Natl Acad Sci U S A 2017; 114:E5197-E5206. [PMID: 28607088 DOI: 10.1073/pnas.1705312114] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022] Open
Abstract
The recessive N-ethyl-N-nitrosourea-induced phenotype toku is characterized by delayed hair growth, progressive hair loss, and excessive accumulation of dermal cholesterol, triglycerides, and ceramides. The toku phenotype was attributed to a null allele of Gk5, encoding glycerol kinase 5 (GK5), a skin-specific kinase expressed predominantly in sebaceous glands. GK5 formed a complex with the sterol regulatory element-binding proteins (SREBPs) through their C-terminal regulatory domains, inhibiting SREBP processing and activation. In Gk5toku/toku mice, transcriptionally active SREBPs accumulated in the skin, but not in the liver; they were localized to the nucleus and led to elevated lipid synthesis and subsequent hair growth defects. Similar defective hair growth was observed in kinase-inactive GK5 mutant mice. Hair growth defects of homozygous toku mice were partially rescued by treatment with the HMG-CoA reductase inhibitor simvastatin. GK5 exists as part of a skin-specific regulatory mechanism for cholesterol biosynthesis, independent of cholesterol regulation elsewhere in the body.
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21
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Ehrmann C, Schneider MR. Genetically modified laboratory mice with sebaceous glands abnormalities. Cell Mol Life Sci 2016; 73:4623-4642. [PMID: 27457558 PMCID: PMC11108334 DOI: 10.1007/s00018-016-2312-0] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2016] [Revised: 07/12/2016] [Accepted: 07/19/2016] [Indexed: 12/19/2022]
Abstract
Sebaceous glands (SG) are exocrine glands that release their product by holocrine secretion, meaning that the whole cell becomes a secretion following disruption of the membrane. SG may be found in association with a hair follicle, forming the pilosebaceous unit, or as modified SG at different body sites such as the eyelids (Meibomian glands) or the preputial glands. Depending on their location, SG fulfill a number of functions, including protection of the skin and fur, thermoregulation, formation of the tear lipid film, and pheromone-based communication. Accordingly, SG abnormalities are associated with several diseases such as acne, cicatricial alopecia, and dry eye disease. An increasing number of genetically modified laboratory mouse lines develop SG abnormalities, and their study may provide important clues regarding the molecular pathways regulating SG development, physiology, and pathology. Here, we summarize in tabulated form the available mouse lines with SG abnormalities and, focusing on selected examples, discuss the insights they provide into SG biology and pathology. We hope this survey will become a helpful information source for researchers with a primary interest in SG but also as for researchers from unrelated fields that are unexpectedly confronted with a SG phenotype in newly generated mouse lines.
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Affiliation(s)
- Carmen Ehrmann
- Institute of Molecular Animal Breeding and Biotechnology, Gene Center, LMU Munich, Feodor-Lynen-Str. 25, 81377, Munich, Germany
| | - Marlon R Schneider
- Institute of Molecular Animal Breeding and Biotechnology, Gene Center, LMU Munich, Feodor-Lynen-Str. 25, 81377, Munich, Germany.
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22
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Noordam R, Gunn DA, van Drielen K, Westgate G, Slagboom PE, de Craen AJM, van Heemst D. Both low circulating insulin-like growth factor-1 and high-density lipoprotein cholesterol are associated with hair loss in middle-aged women. Br J Dermatol 2016; 175:728-34. [PMID: 26959288 DOI: 10.1111/bjd.14529] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 03/02/2016] [Indexed: 11/28/2022]
Abstract
BACKGROUND Multiple biomarkers have been associated with hair loss in women, but studies have shown inconsistent results. OBJECTIVES We investigated the associations between markers of cardiovascular disease risk (e.g. serum lipid levels and hypertension) and ageing [e.g. 25-hydroxyvitamin D and insulin-like growth factor (IGF)] with hair loss in a population of middle-aged women. METHODS In a random subgroup of 323 middle-aged women (mean age 61·5 years) from the Leiden Longevity Study, hair loss was graded by three assessors using the Sinclair scale; women with a mean score > 1·5 were classified as cases with hair loss. RESULTS Every 1 SD increase in high-density lipoprotein (HDL) cholesterol was associated with a 0·65-times lower risk [95% confidence interval (CI) 0·46-0·91] of hair loss. For IGF-1 the risk was 0·68 times lower (95% CI 0·48-0·97) per 1 SD increase, independently of the other studied variables. Women with both IGF-1 and HDL cholesterol levels below the medians of the study population had a 3·47-times higher risk (95% CI 1·30-9·25) of having hair loss. CONCLUSIONS Low HDL cholesterol and IGF-1 were associated with a higher risk of hair loss in women. However, further studies are required to infer causal relationships.
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Affiliation(s)
- R Noordam
- Department of Gerontology and Geriatrics, Leiden University Medical Center, PO Box 9600, 2300 RC, Leiden, The Netherlands
| | - D A Gunn
- Unilever Discover, Sharnbrook, Bedfordshire, U.K
| | - K van Drielen
- Department of Gerontology and Geriatrics, Leiden University Medical Center, PO Box 9600, 2300 RC, Leiden, The Netherlands
| | - G Westgate
- Westgate Consultancy Ltd, Stevington, Bedfordshire, U.K
| | - P E Slagboom
- Section of Molecular Epidemiology, Department of Medical Statistics and Bioinformatics, Leiden University Medical Center, PO Box 9600, 2300 RC, Leiden, The Netherlands
| | - A J M de Craen
- Department of Gerontology and Geriatrics, Leiden University Medical Center, PO Box 9600, 2300 RC, Leiden, The Netherlands
| | - D van Heemst
- Department of Gerontology and Geriatrics, Leiden University Medical Center, PO Box 9600, 2300 RC, Leiden, The Netherlands.
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Potter CS, Kern MJ, Baybo MA, Pruett ND, Godwin AR, Sundberg JP, Awgulewitsch A. Dysregulated expression of sterol O-acyltransferase 1 (Soat1) in the hair shaft of Hoxc13 null mice. Exp Mol Pathol 2015; 99:441-4. [PMID: 26321246 DOI: 10.1016/j.yexmp.2015.08.016] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2015] [Accepted: 08/24/2015] [Indexed: 10/23/2022]
Abstract
The cholesterol-metabolizing enzyme sterol O-acetyltransferase (SOAT1) is implicated in an increasing number of biological and pathological processes in a number of organ systems, including the differentiation of the hair shaft. While the functional and regulatory mechanisms underlying these diverse functional roles remain poorly understood, the compartment of the hair shaft known as medulla, affected by mutations in Soat1, may serve as a suitable model for defining some of these mechanisms. A comparative analysis of mRNA and protein expression patterns of Soat1/SOAT1 and the transcriptional regulator Hoxc13/HOXC13 in postnatal skin of FVB/NTac mice indicated co-expression in the most proximal cells of the differentiating medulla. This finding combined with the significant downregulation of Soat1 expression in postnatal skin of both Hoxc13 gene-targeted and transgenic mice based on previously reported DNA microarray results suggests a potential regulatory relationship between the two genes. Non-detectable SOAT1 expression in the defective hair follicle medulla of Hoxc13(tm1Mrc) mice and evidence for binding of HOXC13 to the Soat1 upstream control region obtained by ChIP assay suggests that Soat1 is a downstream regulatory target for HOXC13 during medulla differentiation.
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Affiliation(s)
- Christopher S Potter
- Department of Medicine, Medical University of South Carolina, Charleston, SC, United States
| | - Michael J Kern
- Department of Regenerative Medicine and Cell Biology, Medical University of South Carolina, United States
| | - Mary Ann Baybo
- Department of Regenerative Medicine and Cell Biology, Medical University of South Carolina, United States
| | - Nathanael D Pruett
- Department of Medicine, Medical University of South Carolina, Charleston, SC, United States
| | - Alan R Godwin
- Department of Microbiology, Immunology, and Pathology, Colorado State University, Fort Collins, CO, United States
| | | | - Alexander Awgulewitsch
- Department of Medicine, Medical University of South Carolina, Charleston, SC, United States; Department of Regenerative Medicine and Cell Biology, Medical University of South Carolina, United States.
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Haslam IS, El-Chami C, Faruqi H, Shahmalak A, O'Neill CA, Paus R. Differential expression and functionality of ATP-binding cassette transporters in the human hair follicle. Br J Dermatol 2015; 172:1562-1572. [PMID: 25418064 DOI: 10.1111/bjd.13549] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 11/18/2014] [Indexed: 12/13/2022]
Abstract
BACKGROUND ATP-binding cassette (ABC) transporters are involved in the active transport of an extremely diverse range of substrates across biological membranes. These transporters are commonly implicated in the development of multidrug resistance and are also involved in numerous physiological and homeostatic processes, including lipid transport, cell migration and differentiation. OBJECTIVES To close the knowledge gap in the expression of ABC transporters in the human hair follicle (HF). METHODS Quantitative polymerase chain reaction (qPCR) of ABC genes and immunofluorescence microscopy analysis of cryosections of human HFs. RESULTS By qPCR analysis, numerous members of the ABC transporter superfamily, such as ABCB1, ABCG2 and ABCA12, were found to be transcribed in full-length human scalp HFs. Immunofluorescence microscopy demonstrated that the intrafollicular protein expression of different xenobiotic ABC transporters (ABCB1, ABCC1, ABCC4, ABCG2) varies greatly, with ABCG2 expression restricted primarily to the epithelial stem cell region of the outer root sheath (bulge), whereas expression of ABCB1, ABCC1 and ABCC4 was more widespread. Lipid transporters ABCA1, ABCA12 and ABCA4 were almost uniformly expressed throughout the HF epithelium. Functional ABCB1/G2 activity was demonstrated by exclusion of the substrate dye, Hoechst 33342. In the bulge, this was reversed by ABCB1 and ABCG2 inhibition. CONCLUSIONS These data encourage further investigation of ABC transporters as potentially important regulators of HF epithelial biology. Clinically, pharmacological modulation of the activity of selected intrafollicular ABC transporters may permit novel therapeutic interventions, such as protecting HF stem cells from chemotherapy-induced damage, counteracting cholesterol-associated hypertrichosis, and manipulating the intrafollicular prostaglandin balance in androgenetic alopecia.
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Affiliation(s)
- I S Haslam
- The Centre for Dermatology Research, Institute of Inflammation and Repair, University of Manchester, Oxford Road, Stopford Building, Manchester, M13 9PT, U.K
| | - C El-Chami
- The Centre for Dermatology Research, Institute of Inflammation and Repair, University of Manchester, Oxford Road, Stopford Building, Manchester, M13 9PT, U.K
| | - H Faruqi
- The Centre for Dermatology Research, Institute of Inflammation and Repair, University of Manchester, Oxford Road, Stopford Building, Manchester, M13 9PT, U.K
| | - A Shahmalak
- Crown Cosma Clinic, Thorley House, Bailey Lane, Manchester, U.K
| | - C A O'Neill
- The Centre for Dermatology Research, Institute of Inflammation and Repair, University of Manchester, Oxford Road, Stopford Building, Manchester, M13 9PT, U.K
| | - R Paus
- The Centre for Dermatology Research, Institute of Inflammation and Repair, University of Manchester, Oxford Road, Stopford Building, Manchester, M13 9PT, U.K.,Department of Dermatology, University of Münster, Münster, Germany
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25
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Ceramide synthase 4 deficiency in mice causes lipid alterations in sebum and results in alopecia. Biochem J 2014; 461:147-58. [PMID: 24738593 DOI: 10.1042/bj20131242] [Citation(s) in RCA: 51] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
Five ceramide synthases (CerS2-CerS6) are expressed in mouse skin. Although CerS3 has been shown to fulfill an essential function during skin development, neither CerS6- nor CerS2-deficient mice show an obvious skin phenotype. In order to study the role of CerS4, we generated CerS4-deficient mice (Cers4-/-) and CerS4-specific antibodies. With these biological tools we analysed the tissue distribution and determined the cell-type specific expression of CerS4 in suprabasal epidermal layers of footpads as well as in sebaceous glands of the dorsal skin. Loss of CerS4 protein leads to an altered lipid composition of the sebum, which is more solidified and therefore might cause progressive hair loss due to physical blocking of the hair canal. We also noticed a strong decrease in C20 1,2-alkane diols consistent with the decrease of wax diesters in the sebum of Cers4-/- mice. Cers4-/- mice at 12 months old display additional epidermal tissue destruction due to dilated and obstructed pilary canals. Mass spectrometric analyses additionally show a strong decrease in C20-containing sphingolipids.
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26
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Kiritsi D, Schauer F, Wölfle U, Valari M, Bruckner-Tuderman L, Has C, Happle R. Targeting epidermal lipids for treatment of Mendelian disorders of cornification. Orphanet J Rare Dis 2014; 9:33. [PMID: 24607067 PMCID: PMC3975448 DOI: 10.1186/1750-1172-9-33] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2013] [Accepted: 03/03/2014] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND Inherited ichthyoses or Mendelian disorders of cornification (MeDOC) are clinically heterogeneous disorders with high unmet therapeutic needs, which are characterized by skin hyperkeratosis and scaling. Some MeDOC types are associated with defects of the epidermal lipid metabolism, resulting in perturbed barrier permeability and subsequent epidermal hyperplasia, hyperkeratosis and inflammation. An example is the CHILD (congenital hemidysplasia with ichthyosiform nevus and limb defects) syndrome, an X-linked dominant multisystem MeDOC caused by mutations in the NSDHL (NAD(P)H steroid dehydrogenase-like protein) gene, which is involved in the distal cholesterol biosynthetic pathway. The skin manifestations of the CHILD syndrome have been attributed to two major mechanisms: deficiency of cholesterol, probably influencing the proper corneocyte membrane formation, and toxic accumulation of aberrant steroid precursors. METHODS Here we addressed the efficacy of an ointment containing cholesterol and simvastatin, an agent inhibiting endogenous cholesterol synthesis in a compassionate-use treatment of three patients with CHILD syndrome. To test the specificity of this therapeutic approach, we applied the same topical treatment to two patients with other types of MeDOC with disturbed skin lipid metabolism. RESULTS The therapy with simvastatin and cholesterol was highly effective and well-tolerated by the CHILD syndrome patients; only lesions in the body folds represented a therapeutic challenge. No improvement was noted in the patients with other types of MeDOC. CONCLUSIONS This therapy is inexpensive and accessible to every patient with CHILD syndrome, because both simvastatin and cholesterol are available worldwide. Our data provide initial evidence of the specificity of the therapeutic effect of the simvastatin-cholesterol ointment in CHILD syndrome in comparison to other types of MeDOC.
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Affiliation(s)
| | | | | | | | | | - Cristina Has
- Department of Dermatology, Medical Center-University of Freiburg, 79104 Freiburg, Germany.
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27
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Stojadinovic O, Lebrun E, Pastar I, Kirsner R, Davis SC, Tomic-Canic M. Statins as potential therapeutic agents for healing disorders. ACTA ACUST UNITED AC 2014. [DOI: 10.1586/edm.10.60] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
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Abstract
During the past 20 years, tremendous progress has been made in our understanding of the molecular basis of many genetic skin conditions. The translation of these laboratory findings into effective therapies for affected individuals has been slow, however, in large part due to the risk of carcinogenesis from random viral genomic integration and the lack of efficacy of topically applied genetic material and most proteins. As intervention at the gene level still appears remote for most genetic disorders, increased knowledge about the cellular and biochemical pathogenesis of disease allows specific targeting of pathways with existing and/or novel drugs and molecules. In contrast to the requirement for personalization of most gene-based approaches, pathogenesis-based therapy is pathway specific, and in theory, it should have broader applicability. In this chapter, we provide an overview of the pathoetiology of the various types of ichthyoses and demonstrate how a pathogenesis-based approach can potentially lead to innovative treatments for these conditions. Notably, this strategy has been successfully validated for the treatment of the rare X-linked dominant condition, CHILD syndrome, in which topical applications of cholesterol and lovastatin together to affected skin resulted in marked improvement of the skin phenotype.
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Affiliation(s)
- Joey E Lai-Cheong
- St John's Institute of Dermatology, King's College London, London, United Kingdom
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29
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Mirmirani P, Maurer T, Cohen M, D'Souza G, Karim R, Plankey M, Robison E, Sharma A, Tien PC, Hessol NA. Investigating the effects of metabolic dysregulation on hair follicles: a comparison of HIV-infected women with and without central lipohypertrophy. Int J Dermatol 2013; 53:e443-8. [PMID: 23786579 DOI: 10.1111/ijd.12044] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
BACKGROUND Normal lipid metabolism and functioning of the peroxisome proliferator-activated receptor gamma (PPAR-gamma) in the sebaceous gland is critical to maintaining a normal hair follicle. Human immunodeficiency virus (HIV) infection affects lipid metabolism; some have hypothesized a link between PPAR-gamma function and lipodystrophy in HIV infection. Our objective was to determine whether lipodystrophy is associated with altered hair characteristics in HIV-infected women from the Women's Interagency HIV Study. METHODS Hair characteristics and scalp inflammation were assessed by an interviewer-administered questionnaire. Central lipohypertrophy and peripheral lipoatrophy were defined by self-report of moderate to severe fat gain in central body sites and fat loss in peripheral body sites, respectively confirmed by clinical examination. Additional covariates considered in the analyses included demographics, behavioral characteristics, medical history, and HIV-related factors. RESULTS There were 1037 women with data on all study variables; 76 women reported central lipohypertrophy, while only four women reported lipoatrophy. Women with central lipohypertrophy were more likely to be older, had a self-reported history of injection drug use, statin medication use, diabetes, elevated cholesterol, and have self-reported less hair and shorter eyelashes. After adjustment for age, central lipohypertrophy was associated with shorter eyelashes (OR 2.3; 95% CI 1.4-3.8). CONCLUSIONS Central lipohypertrophy was not associated with change in scalp hair texture or scalp inflammation in this cohort. Rather, we found an association between central lipohypertrophy and shorter eyelash length. This finding may be explained by an influence of prostaglandin E2 mediators on eyelash follicles.
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Affiliation(s)
- Paradi Mirmirani
- Department of Dermatology, The Permanente Medical Group, Vallejo, CA, USA
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Simulative evaluation of taurine against alopecia caused by stress in Caenorhabditis elegans. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2013; 776:267-76. [PMID: 23392889 DOI: 10.1007/978-1-4614-6093-0_25] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Hair loss or alopecia has been portrayed as a modern malady which is aggravated by stressful conditions. Major cases of alopecia were found among individuals of 40s-50s, nowadays, even among the 20s-30s. This study characterized taurine's potential against alopecia caused by chemical stress agents based on the comparison with other commercially available anti-alopecia agents using Caenorhabditis elegans. The criteria used are their effects on the expression of stress markers and measurements of vital signs: lifespan comparison, progeny number, and mobility. C. elegans showed the typical stress symptoms under treatment with tunicamycin, endoplasmic reticulum stress agent. Hsp-70 protein expression increased, while worm's lifespan and per capita progeny number significantly decreased along with an unusually retarded movement. A positive response was shown when worms were treated with taurine along with astressin-B and finasteride. Between the treatments, finasteride showed better outcomes in terms of stress-reducing effects. Taurine helped worms recover more effectively from adverse influence of stress. In conclusion, there is strong evidence that taurine has a great potential as anti-alopecia effect especially against the one caused by the chemical stress. The present study implies that taurine might strongly work against hair loss when used in combination with other commercially available -anti-alopecia agents.
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31
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Dong XY, Tang SQ, Chen JD. Dual functions of Insig proteins in cholesterol homeostasis. Lipids Health Dis 2012; 11:173. [PMID: 23249523 PMCID: PMC3564778 DOI: 10.1186/1476-511x-11-173] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2012] [Accepted: 12/05/2012] [Indexed: 01/29/2023] Open
Abstract
The molecular mechanism of how cells maintain cholesterol homeostasis has become clearer for the understanding of complicated association between sterol regulatory element-binding proteins (SREBPs), SREBP cleavage-activating protein (SCAP), 3-hydroxy-3-methylglutaryl coenzyme A reductase (HMG-CoA reductase) and Insuin induced-genes (Insigs). The pioneering researches suggested that SREBP activated the transcription of genes encoding HMG-CoA reductase and all of the other enzymes involved in the synthesis of cholesterol and lipids. However, SREBPs can not exert their activities alone, they must form a complex with another protein, SCAP in the endoplasmic reticulum (ER) and translocate to Golgi. Insigs are sensors and mediators that regulate cholesterol homeostasis through binding to SCAP and HMG-CoA reductase in diverse tissues such as adipose tissue and liver, as well as the cultured cells. In this article, we aim to review on the dual functions of Insig protein family in cholesterol homeostasis.
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Affiliation(s)
- Xiao-Ying Dong
- College of Veterinary Medicine, South China Agricultural University, No,483 Wu Shan Road, Tian He District, Guangzhou, 510642, China.
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32
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Elias PM, Williams ML, Feingold KR. Abnormal barrier function in the pathogenesis of ichthyosis: therapeutic implications for lipid metabolic disorders. Clin Dermatol 2012; 30:311-22. [PMID: 22507046 DOI: 10.1016/j.clindermatol.2011.08.017] [Citation(s) in RCA: 44] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Ichthyoses, including inherited disorders of lipid metabolism, display a permeability barrier abnormality in which the severity of the clinical phenotype parallels the prominence of the barrier defect. The pathogenesis of the cutaneous phenotype represents the consequences of the mutation for epidermal function, coupled with a "best attempt" by affected epidermis to generate a competent barrier in a terrestrial environment. A compromised barrier in normal epidermis triggers a vigorous set of metabolic responses that rapidly normalizes function, but ichthyotic epidermis, which is inherently compromised, only partially succeeds in this effort. Unraveling mechanisms that account for barrier dysfunction in the ichthyoses has identified multiple, subcellular, and biochemical processes that contribute to the clinical phenotype. Current treatment of the ichthyoses remains largely symptomatic: directed toward reducing scale or corrective gene therapy. Reducing scale is often minimally effective. Gene therapy is impeded by multiple pitfalls, including difficulties in transcutaneous drug delivery, high costs, and discomfort of injections. We have begun to use information about disease pathogenesis to identify novel, pathogenesis-based therapeutic strategies for the ichthyoses. The clinical phenotype often reflects not only a deficiency of pathway end product due to reduced-function mutations in key synthetic enzymes but often also accumulation of proximal, potentially toxic metabolites. As a result, depending upon the identified pathomechanism(s) for each disorder, the accompanying ichthyosis can be treated by topical provision of pathway product (eg, cholesterol), with or without a proximal enzyme inhibitor (eg, simvastatin), to block metabolite production. Among the disorders of distal cholesterol metabolism, the cutaneous phenotype in Congenital Hemidysplasia with Ichthyosiform Erythroderma and Limb Defects (CHILD syndrome) and X-linked ichthyosis reflect metabolite accumulation and deficiency of pathway product (ie, cholesterol). We validated this therapeutic approach in two CHILD syndrome patients who failed to improve with topical cholesterol alone, but cleared with dual treatment with cholesterol plus lovastatin. In theory, the ichthyoses in other inherited lipid metabolic disorders could be treated analogously. This pathogenesis (pathway)-driven approach possesses several inherent advantages: (1) it is mechanism-specific for each disorder; (2) it is inherently safe, because natural lipids and/or approved drugs often are utilized; and (3) it should be inexpensive, and therefore it could be used widely in the developing world.
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Affiliation(s)
- Peter M Elias
- Dermatology Service, Veterans Affairs Medical Center, 4150 Clement St, San Francisco, CA 94121, USA.
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Engelking LJ, McFarlane MR, Li CK, Liang G. Blockade of cholesterol absorption by ezetimibe reveals a complex homeostatic network in enterocytes. J Lipid Res 2012; 53:1359-68. [PMID: 22523394 PMCID: PMC3371247 DOI: 10.1194/jlr.m027599] [Citation(s) in RCA: 49] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2012] [Indexed: 12/29/2022] Open
Abstract
Enterocyte cholesterol homeostasis reflects aggregated rates of sterol synthesis, efflux, and uptake from plasma and gut lumen. Cholesterol synthesis and LDL uptake are coordinately regulated by sterol regulatory element-binding proteins (SREBP), whereas sterol efflux is regulated by liver X receptors (LXR). How these processes are coordinately regulated in enterocytes, the site of cholesterol absorption, is not well understood. Here, we treat mice with ezetimibe to investigate the effect of blocking cholesterol absorption on intestinal SREBPs, LXRs, and their effectors. Ezetimibe increased nuclear SREBP-2 8-fold. HMG-CoA reductase (HMGR) and LDL receptor (LDLR) mRNA levels increased less than 3-fold, whereas their protein levels increased 30- and 10-fold, respectively. Expression of inducible degrader of LDLR (IDOL), an LXR-regulated gene that degrades LDLRs, was reduced 50% by ezetimibe. Coadministration of ezetimibe with the LXR agonist T0901317 abolished the reduction in IDOL and prevented the increase in LDLR protein. Ezetimibe-stimulated LDLR expression was independent of proprotein convertase subtilisin/kexin type 9 (PSCK9), a protein that degrades LDLRs. To maintain cholesterol homeostasis in the face of ezetimibe, enterocytes boost LDL uptake by increasing LDLR number, and they boost sterol synthesis by increasing HMGR and other cholesterologenic genes. These studies reveal a hitherto undescribed homeostatic network in enterocytes triggered by blockade of cholesterol absorption.
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Affiliation(s)
- Luke J Engelking
- Department of Molecular Genetics, University of Texas Southwestern Medical Center, Dallas, TX, USA.
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Panicker SP, Ganguly T, Consolo M, Price V, Mirmirani P, Honda K, Karnik P. Sterol intermediates of cholesterol biosynthesis inhibit hair growth and trigger an innate immune response in cicatricial alopecia. PLoS One 2012; 7:e38449. [PMID: 22685570 PMCID: PMC3369908 DOI: 10.1371/journal.pone.0038449] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2012] [Accepted: 05/05/2012] [Indexed: 12/19/2022] Open
Abstract
Primary cicatricial alopecia (PCA) is a group of inflammatory hair disorders that cause scarring and permanent hair loss. Previous studies have implicated PPARγ, a transcription factor that integrates lipogenic and inflammatory signals, in the pathogenesis of PCA. However, it is unknown what triggers the inflammatory response in these disorders, whether the inflammation is a primary or secondary event in disease pathogenesis, and whether the inflammatory reaction reflects an autoimmune process. In this paper, we show that the cholesterol biosynthetic pathway is impaired in the skin and hair follicles of PCA patients. Treatment of hair follicle cells with BM15766, a cholesterol biosynthesis inhibitor, or 7-dehydrocholesterol (7-DHC), a sterol precursor, stimulates the expression of pro-inflammatory chemokine genes. Painting of mouse skin with 7-DHC or BM15766 inhibits hair growth, causes follicular plugging and induces the infiltration of inflammatory cells into the interfollicular dermis. Our results demonstrate that cholesterologenic changes within hair follicle cells trigger an innate immune response that is associated with the induction of toll-like receptor (TLR) and interferon (IFN) gene expression, and the recruitment of macrophages that surround the hair follicles and initiate their destruction. These findings reveal a previously unsuspected role for cholesterol precursors in PCA pathogenesis and identify a novel link between sterols and inflammation that may prove transformative in the diagnosis and treatment of these disorders.
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Affiliation(s)
- Sreejith P. Panicker
- Department of Dermatology, University Hospitals Case Medical Center, Case Western Reserve University, Cleveland, Ohio, United States of America
| | - Taneeta Ganguly
- Department of Dermatology, University Hospitals Case Medical Center, Case Western Reserve University, Cleveland, Ohio, United States of America
| | - Mary Consolo
- Department of Dermatology, University Hospitals Case Medical Center, Case Western Reserve University, Cleveland, Ohio, United States of America
| | - Vera Price
- Department of Dermatology, University Hospitals Case Medical Center, Case Western Reserve University, Cleveland, Ohio, United States of America
| | - Paradi Mirmirani
- Department of Dermatology, University Hospitals Case Medical Center, Case Western Reserve University, Cleveland, Ohio, United States of America
| | - Kord Honda
- Department of Dermatology, University Hospitals Case Medical Center, Case Western Reserve University, Cleveland, Ohio, United States of America
| | - Pratima Karnik
- Department of Dermatology, University Hospitals Case Medical Center, Case Western Reserve University, Cleveland, Ohio, United States of America
- * E-mail:
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Prade E, Tobiasch M, Hitkova I, Schäffer I, Lian F, Xing X, Tänzer M, Rauser S, Walch A, Feith M, Post S, Röcken C, Schmid RM, Ebert MPA, Burgermeister E. Bile acids down-regulate caveolin-1 in esophageal epithelial cells through sterol responsive element-binding protein. Mol Endocrinol 2012; 26:819-32. [PMID: 22474125 DOI: 10.1210/me.2011-1140] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023] Open
Abstract
Bile acids are synthesized from cholesterol and are major risk factors for Barrett adenocarcinoma (BAC) of the esophagus. Caveolin-1 (Cav1), a scaffold protein of membrane caveolae, is transcriptionally regulated by cholesterol via sterol-responsive element-binding protein-1 (SREBP1). Cav1 protects squamous epithelia by controlling cell growth and stabilizing cell junctions and matrix adhesion. Cav1 is frequently down-regulated in human cancers; however, the molecular mechanisms that lead to this event are unknown. We show that the basal layer of the nonneoplastic human esophageal squamous epithelium expressed Cav1 mainly at intercellular junctions. In contrast, Cav1 was lost in 95% of tissue specimens from BAC patients (n = 100). A strong cytoplasmic expression of Cav1 correlated with poor survival in a small subgroup (n = 5) of BAC patients, and stable expression of an oncogenic Cav1 variant (Cav1-P132L) in the human BAC cell line OE19 promoted proliferation. Cav1 was also detectable in immortalized human squamous epithelial, Barrett esophagus (CPC), and squamous cell carcinoma cells (OE21), but was low in BAC cell lines (OE19, OE33). Mechanistically, bile acids down-regulated Cav1 expression by inhibition of the proteolytic cleavage of 125-kDa pre-SREBP1 from the endoplasmic reticulum/Golgi apparatus and nuclear translocation of active 68-kDa SREBP1. This block in SREBP1's posttranslational processing impaired transcriptional activation of SREBP1 response elements in the proximal human Cav1 promoter. Cav1 was also down-regulated in esophagi from C57BL/6 mice on a diet enriched with 1% (wt/wt) chenodeoxycholic acid. Mice deficient for Cav1 or the nuclear bile acid receptor farnesoid X receptor showed hyperplasia and hyperkeratosis of the basal cell layer of esophageal epithelia, respectively. These data indicate that bile acid-mediated down-regulation of Cav1 marks early changes in the squamous epithelium, which may contribute to onset of Barrett esophagus metaplasia and progression to BAC.
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Affiliation(s)
- Elke Prade
- Department of Chemistry, Klinikum rechts der Isar, Technische Universität München, D-81675 Munich, Germany
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Integral hair lipid in human hair follicle. J Dermatol Sci 2011; 64:153-8. [DOI: 10.1016/j.jdermsci.2011.08.004] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2011] [Revised: 08/10/2011] [Accepted: 08/12/2011] [Indexed: 01/21/2023]
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Elias PM, Crumrine D, Paller A, Rodriguez-Martin M, Williams ML. Pathogenesis of the cutaneous phenotype in inherited disorders of cholesterol metabolism: Therapeutic implications for topical treatment of these disorders. DERMATO-ENDOCRINOLOGY 2011; 3:100-6. [PMID: 21695019 PMCID: PMC3117009 DOI: 10.4161/derm.3.2.14831] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/04/2011] [Accepted: 01/13/2011] [Indexed: 11/20/2022]
Abstract
Molecular geneticists tend to conceptualize disease pathogenesis from the mutated gene outward, an approach that does not take into account the impact of barrier requirements in determining disease phenotype. An ‘outside-to-inside’ perspective has provided quite different explanations for the ichthyoses, including several of the disorders of distal cholesterol metabolism. Elucidation of responsible pathogenic mechanisms also is pointing to appropriate, pathogenesis (pathway)-based therapeutic strategies. In the case of the lipid metabolic disorders, it takes full advantage of new molecular, genetic and cellular pathogenesis information to correct or bypass the metabolic abnormality. This approach fully exploits the unique accessibility of the skin to a topical approach. Moreover, since it will utilize topical lipids and lipid-soluble, and often generic, lipid-soluble drugs, these treatments should be readily transported across the stratum corneum. If successful, this approach could initiate an entirely new departure for the therapy of the ichthyoses. Finally, because these agents are relatively safe and inexpensive, this form of treatment has the potential to be widely-deployed, even in the developing world.
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Affiliation(s)
- Peter M Elias
- Dermatology Service; Department of Veterans Affairs Medical Center and Dermatology; University of California, San Francisco; San Francisco, CA USA
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Ruge F, Glavini A, Gallimore AM, Richards HE, Thomas CP, O'Donnell VB, Philpott MP, Porter RM. Delineating immune-mediated mechanisms underlying hair follicle destruction in the mouse mutant defolliculated. J Invest Dermatol 2010; 131:572-9. [PMID: 21160494 DOI: 10.1038/jid.2010.379] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
Defolliculated (Gsdma3(Dfl)/+) mice have a hair loss phenotype that involves an aberrant hair cycle, altered sebaceous gland differentiation with reduced sebum production, chronic inflammation, and ultimately the loss of the hair follicle. Hair loss in these mice is similar to that seen in primary cicatricial, or scarring alopecias in which immune targeting of hair follicle stem cells has been proposed as a key factor resulting in permanent hair follicle destruction. In this study we examine the mechanism of hair loss in GsdmA3(Dfl)/+ mice. Aberrant expression patterns of stem cell markers during the hair cycle, in addition to aberrant behavior of the melanocytes leading to ectopic pigmentation of the hair follicle and epidermis, indicated the stem cell niche was not maintained. An autoimmune mechanism was excluded by crossing the mice with rag1-/- mice. However, large numbers of macrophages and increased expression of ICAM-1 were still present and may be involved either directly or indirectly in the hair loss. Reverse transcriptase-PCR (RT-PCR) and immunohistochemistry of sebaceous gland differentiation markers revealed reduced peroxisome proliferator-activated receptor-γ (PPARγ), a potential cause of reduced sebum production, as well as the potential involvement of the innate immune system in the hair loss. As reduced PPARγ expression has recently been implicated as a cause for lichen planopilaris, these mice may be useful for testing therapies.
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Affiliation(s)
- Fiona Ruge
- Department of Dermatology and Wound Healing, School of Medicine, Cardiff University, Cardiff, UK
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McLarren KW, Severson TM, du Souich C, Stockton DW, Kratz LE, Cunningham D, Hendson G, Morin RD, Wu D, Paul JE, An J, Nelson TN, Chou A, DeBarber AE, Merkens LS, Michaud JL, Waters PJ, Yin J, McGillivray B, Demos M, Rouleau GA, Grzeschik KH, Smith R, Tarpey PS, Shears D, Schwartz CE, Gecz J, Stratton MR, Arbour L, Hurlburt J, Van Allen MI, Herman GE, Zhao Y, Moore R, Kelley RI, Jones SJM, Steiner RD, Raymond FL, Marra MA, Boerkoel CF. Hypomorphic temperature-sensitive alleles of NSDHL cause CK syndrome. Am J Hum Genet 2010; 87:905-14. [PMID: 21129721 DOI: 10.1016/j.ajhg.2010.11.004] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2010] [Revised: 10/31/2010] [Accepted: 11/10/2010] [Indexed: 12/28/2022] Open
Abstract
CK syndrome (CKS) is an X-linked recessive intellectual disability syndrome characterized by dysmorphism, cortical brain malformations, and an asthenic build. Through an X chromosome single-nucleotide variant scan in the first reported family, we identified linkage to a 5 Mb region on Xq28. Sequencing of this region detected a segregating 3 bp deletion (c.696_698del [p.Lys232del]) in exon 7 of NAD(P) dependent steroid dehydrogenase-like (NSDHL), a gene that encodes an enzyme in the cholesterol biosynthesis pathway. We also found that males with intellectual disability in another reported family with an NSDHL mutation (c.1098 dup [p.Arg367SerfsX33]) have CKS. These two mutations, which alter protein folding, show temperature-sensitive protein stability and complementation in Erg26-deficient yeast. As described for the allelic disorder CHILD syndrome, cells and cerebrospinal fluid from CKS patients have increased methyl sterol levels. We hypothesize that methyl sterol accumulation, not only cholesterol deficiency, causes CKS, given that cerebrospinal fluid cholesterol, plasma cholesterol, and plasma 24S-hydroxycholesterol levels are normal in males with CKS. In summary, CKS expands the spectrum of cholesterol-related disorders and insight into the role of cholesterol in human development.
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Serra M, Matabosch X, Ying L, Watson G, Shackleton C. Hair and skin sterols in normal mice and those with deficient dehydrosterol reductase (DHCR7), the enzyme associated with Smith-Lemli-Opitz syndrome. J Steroid Biochem Mol Biol 2010; 122:318-25. [PMID: 20804844 PMCID: PMC2964438 DOI: 10.1016/j.jsbmb.2010.08.006] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/04/2010] [Revised: 08/19/2010] [Accepted: 08/20/2010] [Indexed: 12/20/2022]
Abstract
Our recent studies have focused on cholesterol synthesis in mouse models for 7-dehydrosterolreductase (DHCR7) deficiency, also known as Smith-Lemli-Opitz syndrome. Investigations of such mutants have relied on tissue and blood levels of the cholesterol precursor 7-dehydrocholesterol (7DHC) and its 8-dehydro isomer. In this investigation by gas chromatography/mass spectrometry (GC/MS) we have identified and quantified cholesterol and its precursors (7DHC, desmosterol, lathosterol, lanosterol and cholest-7,24-dien-3β-ol) in mouse hair. The components were characterized and their concentrations were compared to those found in mouse skin and serum. Hair appeared unique in that desmosterol was a major sterol component, almost matching in concentration cholesterol itself. In DHCR7 deficient mice, dehydrodesmosterol (DHD) was the dominant hair Δ(7) sterol. Mutant mouse hair had much higher concentrations of 7-dehydrosterols relative to cholesterol than did serum or tissue at all ages studied. The 7DHC/C ratio in hair was typically about sevenfold the value in serum or skin and the DHD/D ratio was 100× that of the serum 7DHC/C ratio. Mutant mice compensate for their DHCR7 deficiency with maturity, and the tissue and blood 7DHC/C become close to normal. That hair retains high relative concentrations of the dehydro precursors suggests that the apparent up-regulation of Dhcr7 seen in liver is slower to develop at the site of hair cholesterol synthesis.
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Affiliation(s)
- Montserrat Serra
- Children's Hospital Oakland Research Institute, Oakland, CA 94609, USA
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41
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Dong XY, Tang SQ. Insulin-induced gene: a new regulator in lipid metabolism. Peptides 2010; 31:2145-50. [PMID: 20817058 DOI: 10.1016/j.peptides.2010.07.020] [Citation(s) in RCA: 92] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/10/2010] [Revised: 07/15/2010] [Accepted: 07/15/2010] [Indexed: 10/19/2022]
Abstract
Insulin-induced genes (Insigs) including Insig-1 and Insig-2, are proteins that mediate sterol regulation of sterol regulatory element-binding protein (SREBP) cleavage-activating protein (SCAP) and 3-hydroxy-3-methylglutaryl-coenzyme A reductase (HMG-CoA reductase). Insigs perform distinct tasks in the regulation of these effectors: they promote the endoplasmic reticulum (ER) retention of SCAP, but ubiquitin-mediated degradation of HMG-CoA reductase. Through these activities, Insig-1 and Insig-2 influence cholesterol metabolism, lipogenesis, and glucose homeostasis in diverse tissues such as adipose tissue and liver. In this article, we focus on the functions, expression and regulation, gene polymorphisms of Insigs, and their deficiency with diseases.
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Affiliation(s)
- Xiao-Ying Dong
- College of Yingdong Agricultural Science and Engineering, Shaoguan University, Daxue Avenue, Zhenjiang District, Shaoguan 512005, PR China
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Korade Z, Xu L, Shelton R, Porter NA. Biological activities of 7-dehydrocholesterol-derived oxysterols: implications for Smith-Lemli-Opitz syndrome. J Lipid Res 2010; 51:3259-69. [PMID: 20702862 DOI: 10.1194/jlr.m009365] [Citation(s) in RCA: 103] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Smith-Lemli-Opitz syndrome (SLOS) is a metabolic and developmental disorder caused by mutations in the gene encoding the enzyme 7-dehydrocholesterol reductase (Dhcr7). This reductase catalyzes the last step in cholesterol biosynthesis, and levels of 7-dehydrocholesterol (7-DHC), the substrate for this enzyme, are elevated in SLOS patients as a result of this defect. Our group has previously shown that 7-DHC is extremely prone to free radical autoxidation, and we identified about a dozen different oxysterols formed from oxidation of 7-DHC. We report here that 7-DHC-derived oxysterols reduce cell viability in a dose- and time-dependent manner, some of the compounds showing activity at sub-micromolar concentrations. The reduction of cell survival is caused by a combination of reduced proliferation and induced differentiation of the Neuro2a cells. The complex 7-DHC oxysterol mixture added to control Neuro2a cells also triggers the gene expression changes that were previously identified in Dhcr7-deficient Neuro2a cells. Based on the identification of overlapping gene expression changes in Dhcr7-deficient and 7-DHC oxysterol-treated Neuro2a cells, we hypothesize that some of the pathophysiological findings in the mouse SLOS model and SLOS patients might be due to accumulated 7-DHC oxysterols.
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Affiliation(s)
- Zeljka Korade
- Department of Chemistry and Vanderbilt Institute of Chemical Biology, Vanderbilt University, Nashville, TN 37235, USA
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Fon Tacer K, Pompon D, Rozman D. Adaptation of cholesterol synthesis to fasting and TNF-alpha: profiling cholesterol intermediates in the liver, brain, and testis. J Steroid Biochem Mol Biol 2010; 121:619-25. [PMID: 20206258 DOI: 10.1016/j.jsbmb.2010.02.026] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/30/2009] [Revised: 02/16/2010] [Accepted: 02/24/2010] [Indexed: 12/18/2022]
Abstract
Key players in pathogenesis of metabolic disorders are disturbed cholesterol balance and inflammation. In addition to cholesterol also sterol intermediates are biologically active, however, surprisingly little is known about their synthesis and roles. The aim of our study was to assess the interplay between the inflammatory cytokine TNF-alpha and cholesterol synthesis by measuring cholesterol and its intermediates in the liver, brain, and testis. Liquid chromatography-mass spectrometry has been applied to profile sterols of normally fed mice, during fasting and after TNF-alpha administration. In mice on normal chow diet, sterols other than cholesterol represent 0.5% in the liver, 1% in brain and 5% in testis. In the liver only 7-dehydrocholesterol, lanosterol and desmosterol were detected. Major sterol intermediates of the brain are desmosterol, testis meiosis activating sterol (T-MAS), and 7-dehydrocholesterol while in testis T-MAS predominates (4%), followed by desmosterol, lanosterol, 7-dehydrocholesterol and others. In 20h fasting there is no significant change in cholesterol of the three tissues, and no significant change in intermediates of the liver. In the brain sterol intermediates are lowered (significant for zymosterol) while in the testis the trend is opposite. TNF-alpha provokes a significant raise of some intermediates whereas the level of cholesterol is again unchanged. The proportion of sterols in the liver rises from 0.5% in controls to 1.2% in TNF-alpha-treated mice, which is in accordance with published expression profiling data. In conclusion, our data provide novel insights into the interaction between the inflammatory cytokine TNF-alpha and the tissue-specific cholesterol biosynthesis of the liver, brain and testis.
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Affiliation(s)
- Klementina Fon Tacer
- Center for Functional Genomic and Biochips, Institute of Biochemistry, Faculty of Medicine, University of Ljubljana, Zaloska 4, SI-1000 Ljubljana, Slovenia
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Abstract
Little attention has been given to the impact of lipid metabolism on hair follicle biology and pathology. Three recent papers (one in the current issue) describe a major effect of altered lipid metabolism on hair growth. A direct link was made to at least one form of cicatricial alopecia, but the role lipids play in other follicular pathologies, such as the acneiform conditions, are inadequately explored and must be tested.
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Affiliation(s)
- Kurt S Stenn
- Aderans Research Institute, Inc., Philadelphia, Pennsylvania, USA.
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