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Zhang Y, Le Y, Guo J, Wu F, Li Q, Lu P. Barrier function and ultrastructure characteristics of epidermis in patients with primary cutaneous amyloidosis. J Dermatol 2023. [PMID: 37157942 DOI: 10.1111/1346-8138.16819] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/02/2023] [Revised: 03/21/2023] [Accepted: 04/18/2023] [Indexed: 05/10/2023]
Abstract
Previous studies on primary cutaneous amyloidosis (PCA) have mainly focused on exploring genetic mutation and components of amyloid in patients with PCA. However, studies on skin barrier function in PCA patients are scarce. Here, we detected the skin barrier function in PCA patients and healthy people by using noninvasive techniques and characterized ultrastructural features of PCA lesions compared with healthy people using transmission electron microscopy (TEM). The expression of proteins related to skin barrier function was examined by immunohistochemistry staining. A total of 191 patients with clinically diagnosed PCA and 168 healthy individuals were enrolled in the study. Our analysis revealed that all investigated lesion areas displayed higher transepidermal water loss and pH values, and lower Sebum levels and stratum corneum hydration levels in PCA patients compared with the same site area in healthy individuals. The TEM results showed that the intercellular spaces between the basal cells were enlarged and the number of hemidesmosomes decreased in PCA lesions. Immunohistochemical staining showed that the expression of integrin α6 and E-cadherin in PCA patients was less than that in healthy controls, while no differences in the expression of loricrin and filaggrin were observed. Our study revealed that individuals with PCA displayed skin barrier dysfunction, which may be related to alterations in epidermal ultrastructure and a decrease in the skin barrier-related protein E-cadherin. However, the molecular mechanisms underlying skin barrier dysfunction in PCA remain to be elucidated.
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Affiliation(s)
- Yuling Zhang
- Dermatology Hospital, Southern Medical University, Guangzhou, China
- Department of Dermatology, The First Hospital of Jilin University, Changchun, China
| | - Ya Le
- Dermatology Hospital, Southern Medical University, Guangzhou, China
| | - Junyi Guo
- Dermatology Hospital, Southern Medical University, Guangzhou, China
| | - Fangfang Wu
- Dermatology Hospital, Southern Medical University, Guangzhou, China
| | - Qing Li
- Dermatology Hospital, Southern Medical University, Guangzhou, China
| | - Ping Lu
- Dermatology Hospital, Southern Medical University, Guangzhou, China
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2
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Xu J, Zheng T, Zhao C, Huang X, Du W. Resistance of nepetin and its analogs on the fibril formation of human islet amyloid polypeptide. Int J Biol Macromol 2020; 166:435-447. [PMID: 33127549 DOI: 10.1016/j.ijbiomac.2020.10.202] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2020] [Revised: 10/10/2020] [Accepted: 10/24/2020] [Indexed: 12/17/2022]
Abstract
The self-aggregation of human islet amyloid polypeptide (hIAPP) into toxic oligomers and fibrils is closely linked to the pathogenesis of type II diabetes mellitus. Inhibitors can resist hIAPP misfolding, and the resistance can be considered an alternative therapeutic strategy for this disease. Flavones have been applied in the field of diabetes research, however, the inhibition mechanism of many compounds on the fibril formation of related pathogenic peptides remains unclear. In this work, four flavones, namely, nepetin (1), genkwanin (2), luteolin (3), and apigenin (4), were used to impede the peptide aggregation of hIAPP and compared with that on Aβ protein, which is correlated with Alzheimer's disease. Results indicated that the four flavones effectively inhibited the aggregation of the two peptides and mostly dispersed the mature fibrils to monomers. The interactions of flavones with the two peptides demonstrated a spontaneous and exothermic reaction through predominant hydrophobic and hydrogen bonding interactions. The binding affinities of 1 and 3 were stronger than those of 2 and 4 possibly because of the difference in the substituent groups of these molecules. These flavones could also decrease membrane leakage and upregulate cell viability by reducing the formation of toxic oligomers. Moreover, the performance of these flavones in terms of binding affinity, cellular viability, and decreased oligomerization was better on hIAPP than on Aβ. This work offered valuable data about these flavones as prospective therapeutic agents against relevant diseases.
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Affiliation(s)
- Jufei Xu
- Department of Chemistry, Renmin University of China, Beijing 100872, China
| | - Ting Zheng
- Department of Chemistry, Renmin University of China, Beijing 100872, China
| | - Cong Zhao
- Department of Chemistry, Renmin University of China, Beijing 100872, China
| | - Xiangyi Huang
- Department of Chemistry, Renmin University of China, Beijing 100872, China
| | - Weihong Du
- Department of Chemistry, Renmin University of China, Beijing 100872, China.
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3
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Wang L, Zhang N, Li XX, Jiang X. Biphasic amyloidosis involved in the face: Effective treatment with 30% salicylic acid. Dermatol Ther 2018; 32:e12743. [PMID: 30221821 DOI: 10.1111/dth.12743] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2018] [Revised: 08/26/2018] [Accepted: 09/09/2018] [Indexed: 02/05/2023]
Affiliation(s)
- Lian Wang
- Department of Dermatology, West China Hospital, Sichuan University, Chengdu, China
| | - Nan Zhang
- Department of Dermatology, West China Hospital, Sichuan University, Chengdu, China
| | - Xiao-Xue Li
- Department of Dermatology, West China Hospital, Sichuan University, Chengdu, China
| | - Xian Jiang
- Department of Dermatology, West China Hospital, Sichuan University, Chengdu, China
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Veloria JR, Chen L, Li L, Breen GAM, Lee J, Goux WJ. Novel cell-penetrating-amyloid peptide conjugates preferentially kill cancer cells. MEDCHEMCOMM 2018; 9:121-130. [PMID: 30108906 PMCID: PMC6071918 DOI: 10.1039/c7md00321h] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/26/2017] [Accepted: 09/09/2017] [Indexed: 01/13/2023]
Abstract
The goal of this study was to develop a peptide which could use the toxic effects of amyloid, a substance which is the hallmark of over 25 known human diseases, to selectively kill cancer cells. Here we demonstrate that two separate amyloid-forming hexapeptides, one from the microtubule associated protein Tau involved in formation of paired helical filaments of Alzheimer's disease, and the other an amyloid forming sequence from apolipoprotein A1, when conjugated to a cell penetrating peptide (CPP) sequence, form toxic oligomers which are stable for up to 14 h and able to enter cells by a combination of endocytosis and transduction. The amyloid peptide conjugates showed selective cytotoxicity to breast cancer, neuroblastoma and cervical cancer cells in culture compared to normal cells. Fluorescence imaging experiments showed the CPP-amyloid peptide oligomers formed intracellular fibrous amyloid, visible in the endosomes/lysosomes, cytosol and nucleus with thioflavin S (ThS) staining. Further experiments with rhodamine-conjugated Dextran, propidium iodide (PI), and acridine orange (AO) suggested the mechanism of cell death was the permeability of the lysosomal membrane brought about by the formation of amyloid pores. Cytotoxicity could be abrogated by inhibitors of lysosomal hydrolases, consistent with a model where lysosomal hydrolases leak into the cytosol and induce cytotoxicity in subsequent downstream steps. Taken together, our data suggest that CPP-amyloid peptide conjugates show potential as a new class of anti-cancer peptides (ACPs).
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Affiliation(s)
- John R Veloria
- Department of Biological Sciences , The University of Texas at Dallas , 800 W. Campbell Rd , Richardson , TX 75080 , USA
| | - Luxi Chen
- Department of Chemistry and Biochemistry , The University of Texas at Dallas , 800 W. Campbell Rd , Richardson , TX 75080 , USA .
| | - Lin Li
- Department of Biological Sciences , The University of Texas at Dallas , 800 W. Campbell Rd , Richardson , TX 75080 , USA
| | - Gail A M Breen
- Department of Biological Sciences , The University of Texas at Dallas , 800 W. Campbell Rd , Richardson , TX 75080 , USA
| | - Jiyong Lee
- Department of Chemistry and Biochemistry , The University of Texas at Dallas , 800 W. Campbell Rd , Richardson , TX 75080 , USA .
| | - Warren J Goux
- Department of Chemistry and Biochemistry , The University of Texas at Dallas , 800 W. Campbell Rd , Richardson , TX 75080 , USA .
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Veloria JR, Li L, Breen GAM, Goux WJ. Novel Cell Model for Tauopathy Induced by a Cell-Permeable Tau-Related Peptide. ACS Chem Neurosci 2017; 8:2734-2745. [PMID: 28837764 DOI: 10.1021/acschemneuro.7b00275] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022] Open
Abstract
In the present study, a cell penetrating peptide (CPP)-amyloid conjugate was prepared (T-peptide), where the amyloid-forming sequence was homologous to a nucleating sequence from human Tau protein (306VQIVYK311). Kinetic and biophysical studies showed the peptide formed long-lived oligomers which were taken up by endocytosis and localized in perinuclear vesicles and in the cytoplasm of murine hippocampal neuroblastoma cells and human HeLa cells. Thioflavin S (ThS) staining of amyloid colocalized with pathological phosphorylated Tau, suggesting that the peptide was able to seed endogenous wild-type Tau. Subsequent experiments showed that aggregates present in the lysosomes mediated lysosome membrane permeability (LMP). We observed a decrease in total Tau, irrespective of phosphorylation state, consistent with Tau fragmentation by lysosomal proteases. We found cytotoxicity of T-peptide could be abrogated by inhibitors of lysosomal hydrolases and caspases, consistent with a model where Tau fragments processed by the lysosome leak into the cytoplasm and induce toxicity in subsequent downstream steps. It is our hope that the T-peptide system may prove amenable to the evaluation of small molecule inhibitors of cytotoxicity, especially those which target either Tau aggregation or the lysosomal/autophagy system.
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Affiliation(s)
- John R. Veloria
- Department
of Biological Sciences and ‡Department of Chemistry, The University of Texas at Dallas, Richardson, Texas 75080, United States
| | - Lin Li
- Department
of Biological Sciences and ‡Department of Chemistry, The University of Texas at Dallas, Richardson, Texas 75080, United States
| | - Gail A. M. Breen
- Department
of Biological Sciences and ‡Department of Chemistry, The University of Texas at Dallas, Richardson, Texas 75080, United States
| | - Warren J. Goux
- Department
of Biological Sciences and ‡Department of Chemistry, The University of Texas at Dallas, Richardson, Texas 75080, United States
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LaChance A, Phelps A, Finch J, Lu J, Elaba Z, Rezuke W, Murphy MJ. Nodular localized primary cutaneous amyloidosis: a bullous variant. Clin Exp Dermatol 2014; 39:344-7. [DOI: 10.1111/ced.12305] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 11/10/2013] [Indexed: 11/26/2022]
Affiliation(s)
- A. LaChance
- Division of Dermatopathology; Department of Dermatology; University of Connecticut Health Center; Farmington CT USA
| | - A. Phelps
- Division of Dermatopathology; Department of Dermatology; University of Connecticut Health Center; Farmington CT USA
| | - J. Finch
- Division of Dermatopathology; Department of Dermatology; University of Connecticut Health Center; Farmington CT USA
| | - J. Lu
- Division of Dermatopathology; Department of Dermatology; University of Connecticut Health Center; Farmington CT USA
| | - Z. Elaba
- Department of Pathology; Hartford Hospital; Hartford CT USA
| | - W. Rezuke
- Department of Pathology; Hartford Hospital; Hartford CT USA
| | - M. J. Murphy
- Division of Dermatopathology; Department of Dermatology; University of Connecticut Health Center; Farmington CT USA
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Saggini A, Mully T. Reactive eccrine syringofibroadenomatosis secondary to primary cutaneous amyloidosis: a novel association. J Cutan Pathol 2014; 41:380-5. [PMID: 24325801 DOI: 10.1111/cup.12276] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2013] [Revised: 12/02/2013] [Accepted: 12/05/2013] [Indexed: 12/01/2022]
Abstract
We report the unprecedented case of reactive eccrine syringofibroadenoma (ESFA) secondary to primary cutaneous amyloidosis. A 62-year-old woman of Asian ethnicity presented with a pruritic rash on the back of long-standing duration. Physical examination revealed diffuse hyperpigmentation localized to the interscapular region; there were a multitude of hyperpigmented macules merged in a rippled pattern intermixed with scattered papules and cobblestone-like areas. A punch biopsy from a papule was taken. Histopathological examination revealed a network of epithelial strands and cords hanging from the epidermis and harboring foci of ductal differentiation. Eosinophilic collections of amorphous material were found between the epithelial strands, obscuring the superficial dermis. The microscopic picture was consistent with primary cutaneous amyloidosis associated with reactive ESFA. Results of histochemical and immunohistochemical staining confirmed the diagnosis. We speculate that pathogenetic mechanisms intrinsic to primary cutaneous amyloidosis, in addition to unknown genetic factors, resulted in clinical changes of lichen amyloidosus associated with an abnormal hyperplastic epithelial response with histopathological features of ESFA rather than the common epidermal change of acanthosis and hyperkeratosis.
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Affiliation(s)
- Andrea Saggini
- Department of Dermatology, University of Rome Tor Vergata, Rome, Italy
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Misumi Y, Ando Y, Gonçalves NP, Saraiva MJ. Fibroblasts endocytose and degrade transthyretin aggregates in transthyretin-related amyloidosis. J Transl Med 2013; 93:911-20. [PMID: 23817086 DOI: 10.1038/labinvest.2013.83] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2013] [Revised: 05/24/2013] [Accepted: 06/03/2013] [Indexed: 12/12/2022] Open
Abstract
Transthyretin (TTR)-related amyloidosis is a fatal disorder characterized by systemic extracellular deposition of TTR amyloid fibrils. Mutations in the TTR gene cause an autosomal dominant form of the disease-familial amyloidotic polyneuropathy (FAP). Wild-type (WT) TTR can also form amyloid fibrils in elderly patients with senile systemic amyloidosis. Regression of amyloid deposits in FAP patients who undergo liver transplantation to remove the main source of mutant TTR suggests the existence of mechanisms for the clearance of TTR deposits from the extracellular matrix (ECM), but the precise mechanisms are largely unknown. Because fibroblasts are abundant, playing a central role in the maintenance of the ECM and because the skin is one of the major sites of soluble TTR catabolism, in the present study, we analyzed their role in clearance of TTR aggregates. In vitro studies with a fibroblast cell line revealed that fibroblasts endocytosed and degraded aggregated TTR. Subcutaneous injection of soluble and aggregated TTR into WT mice showed internalization and clearance over time by both fibroblasts and macrophages. Immunohistochemical studies of skin biopsies from V30M patients, asymptomatic carriers, recipients of domino FAP livers as well as transgenic mice for human V30M showed intracellular TTR immunoreactivity in fibroblasts and macrophages that increased with clinical status and with age in transgenic mice. Overall, the present in vitro and in vivo data show that fibroblasts endocytose and degrade TTR aggregates. The function or dysfunction of TTR clearance by fibroblasts may have important implications for the development, progression, and regression of TTR deposition in the ECM.
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Affiliation(s)
- Yohei Misumi
- Molecular Neurobiology, IBMC-Instituto de Biologia Molecular e Celular, Porto, Portugal
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Clos AL, Kayed R, Lasagna-Reeves CA. Association of skin with the pathogenesis and treatment of neurodegenerative amyloidosis. Front Neurol 2012; 3:5. [PMID: 22319507 PMCID: PMC3262151 DOI: 10.3389/fneur.2012.00005] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2011] [Accepted: 01/04/2012] [Indexed: 12/12/2022] Open
Abstract
Amyloidosis are a large group of conformational diseases characterized by abnormal protein folding and assembly which results in the accumulation of insoluble protein aggregates that may accumulate systemically or locally in certain organs or tissue. In local amyloidosis, amyloid deposits are restricted to a particular organ or tissue. Alzheimer’s, Parkinson’s disease, and amyotrophic lateral sclerosis are some examples of neurodegenerative amyloidosis. Local manifestation of protein aggregation in the skin has also been reported. Brain and skin are highly connected at a physiological and pathological level. Recently several studies demonstrated a strong connection between brain and skin in different amyloid diseases. In the present review, we discuss the relevance of the “brain–skin connection” in different neurodegenerative amyloidosis, not only at the pathological level, but also as a strategy for the treatment of these diseases.
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Affiliation(s)
- Audra L Clos
- Department of Dermatology, MD Anderson Cancer Center, University of Texas Houston, TX, USA
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Clos AL, Lasagna-Reeves CA, Castillo-Carranza DL, Sengupta U, Jackson GR, Kelly B, Beachkofsky TM, Kayed R. Formation of immunoglobulin light chain amyloid oligomers in primary cutaneous nodular amyloidosis. Br J Dermatol 2011; 165:1349-54. [PMID: 21729025 DOI: 10.1111/j.1365-2133.2011.10508.x] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
BACKGROUND Primary cutaneous nodular amyloidosis (PCNA) is thought to be a plasma cell dyscrasia. The amyloid deposits are found in the dermis and subcutis, and they contain clonal immunoglobulin light chains, produced by a local proliferation of plasma cells. New insights into amyloid diseases have revealed that the pathology is due more to the presence of small, misfolded protein species termed oligomers than to the deposition of fibrillar material. OBJECTIVES To demonstrate the presence of amyloid oligomers in PCNA and to provide evidence that cutaneous amyloid diseases share a common pathogenic pathway similar to other amyloid diseases. METHODS Immunohistochemical staining with conformation-specific and sequence-specific antibodies was used to localize different amyloid species of light chain immunoglobulins in a case of PCNA. Additionally, in vitro characterization of immunoglobulin oligomers and fibrils was performed to determine, through toxicity studies in a human keratinocyte cell line, which amyloidogenic form of the immunoglobulin is toxic in PCNA. RESULTS Amyloid oligomers were identified in PCNA. Oligomers were mainly formed by lambda light chain immunoglobulins, and kappa light chain oligomers were detected in lesser amounts. Amyloid species were detected intra- and extracellularly. In addition, amyloid oligomers and fibrils, derived from unknown protein sources, were detected. This finding suggests that immunoglobulin amyloids can act as seeds capable of inducing the aggregation of heterogeneous proteins in the skin. Furthermore, cytotoxicity studies demonstrated that immunoglobulin oligomers, but not monomers or fibrils, are toxic to human keratinocytes. CONCLUSIONS These data indicate that PCNA has common pathways with other amyloid diseases with respect to protein misfolding and pathogenesis. Immunoglobulin oligomers may prove to be targets for the treatment of PCNA.
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Affiliation(s)
- A L Clos
- Department of Internal Medicine, The George P. and Cynthia Woods Mitchell Center for Neurodegenerative Diseases, University of Texas Medical Branch, Galveston, TX 77555-1045, USA
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