1
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Yuan JP, Zhu PY, Sun YZ, Lu YS, Qi RQ, Chen HD, Wu Y. Paeoniflorin regulates RhoA/ROCK1 and Nrf2 pathways in PDLIM1-dependent or independent manners in oxidative stressed melanocytes. Arch Dermatol Res 2024; 316:401. [PMID: 38878083 DOI: 10.1007/s00403-024-03154-2] [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: 11/18/2023] [Revised: 05/17/2024] [Accepted: 05/19/2024] [Indexed: 06/29/2024]
Abstract
BACKGROUND The adhesive properties of vitiligo melanocytes have decreased under oxidative stress., cytoskeleton proteins can control cell adhesion. Paeoniflorin (PF) was proved to resist hydrogen peroxide (H2O2)-induced oxidative stress in melanocytes via nuclear factorE2-related factor 2 (Nrf2)/heme oxygenase-1 (HO-1) pathway. OBJECTIVES This study was to investigate whether PF exerts anti-oxidative effect through influencing cytoskeleton markers or potential signaling pathway. METHODS Human Oxidative Stress Plus array was used to identify the differentially expressed genes between H2O2 + PF group and H2O2 only group, in PIG1 and PIG3V melanocyte cell lines respectively. Western blotting was used to verify the PCR array results and to test the protein expression levels of cytoskeleton markers including Ras homolog family member A (RhoA), Rho-associated kinase 1 (ROCK1) and antioxidative marker Nrf2. Small interfering RNA was used to knock down PDZ and LIM domain 1 (PDLIM1). RESULTS PF increased the expressions of PDLIM1, RhoA and ROCK1 in H2O2-induced PIG1, in contrast, decreased the expressions of PDLIM1 and ROCK1 in H2O2-induced PIG3V. Knockdown of PDLIM1 increased the expressions of RhoA and Nrf2 in PF-pretreated H2O2-induced PIG1, and ROCK1 and Nrf2 in PF-pretreated H2O2-induced PIG3V. CONCLUSIONS PF regulates RhoA/ROCK1 and Nrf2 pathways in PDLIM1-dependent or independent manners in H2O2-induced melanocytes. In PIG1, PF promotes PDLIM1 to inhibit RhoA/ROCK1 pathway or activates Nrf2/HO-1 pathway, separately. In PIG3V, PF directly downregulates ROCK1 in PDLIM1-independent manner or upregulates Nrf2 dependent of PDLIM1.
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Affiliation(s)
- Jin-Ping Yuan
- Department of Dermatology, The Second Affiliated Hospital of Harbin Medical University, Harbin, 150086, Heilongjiang, China
- Department of Dermatology, The First Hospital of China Medical University, Shenyang, 110001, Liaoning, China
| | - Pei-Yao Zhu
- Department of Dermatology, Shanghai Skin Disease Hospital, Tongji University School of Medicine, 1278 Baode Road, Jing'an District, Shanghai, 200443, China
- Institute of Psoriasis, Tongji University School of Medicine, Shanghai, China
| | - Yu-Zhe Sun
- Dermatological Hospital, Southern Medical University, Guangzhou, 510091, Guangdong, China
| | - Yan-Song Lu
- Department of Dermatology, General Hospital of Northern Theater Command, Shenyang, 110001, Liaoning, China
| | - Rui-Qun Qi
- Department of Dermatology, The First Hospital of China Medical University, Shenyang, 110001, Liaoning, China
| | - Hong-Duo Chen
- Department of Dermatology, The First Hospital of China Medical University, Shenyang, 110001, Liaoning, China.
| | - Yan Wu
- Department of Dermatology, The First Hospital of China Medical University, Shenyang, 110001, Liaoning, China.
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2
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Prospéri MT, Giordano C, Gomez-Duro M, Hurbain I, Macé AS, Raposo G, D’Angelo G. Extracellular vesicles released by keratinocytes regulate melanosome maturation, melanocyte dendricity, and pigment transfer. Proc Natl Acad Sci U S A 2024; 121:e2321323121. [PMID: 38607931 PMCID: PMC11032449 DOI: 10.1073/pnas.2321323121] [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: 12/06/2023] [Accepted: 03/07/2024] [Indexed: 04/14/2024] Open
Abstract
Extracellular vesicles (EVs) facilitate the transfer of proteins, lipids, and genetic material between cells and are recognized as an additional mechanism for sustaining intercellular communication. In the epidermis, the communication between melanocytes and keratinocytes is tightly regulated to warrant skin pigmentation. Melanocytes synthesize the melanin pigment in melanosomes that are transported along the dendrites prior to the transfer of melanin pigment to keratinocytes. EVs secreted by keratinocytes modulate pigmentation in melanocytes [(A. Lo Cicero et al., Nat. Commun. 6, 7506 (2015)]. However, whether EVs secreted by keratinocytes contribute to additional processes essential for melanocyte functions remains elusive. Here, we show that keratinocyte EVs enhance the ability of melanocytes to generate dendrites and mature melanosomes and promote their efficient transfer. Further, keratinocyte EVs carrying Rac1 induce important morphological changes, promote dendrite outgrowth, and potentiate melanin transfer to keratinocytes. Hence, in addition to modulating pigmentation, keratinocytes exploit EVs to control melanocyte plasticity and transfer capacity. These data demonstrate that keratinocyte-derived EVs, by regulating melanocyte functions, are major contributors to cutaneous pigmentation and expand our understanding of the mechanism underlying skin pigmentation via a paracrine EV-mediated communication.
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Affiliation(s)
- Marie-Thérèse Prospéri
- Institut Curie, Paris Sciences & Letters Research University, CNRS, UMR144, Structure and Membrane Compartments, Paris Cedex 0575248, France
| | - Cécile Giordano
- Institut Curie, Paris Sciences & Letters Research University, CNRS, UMR144, Structure and Membrane Compartments, Paris Cedex 0575248, France
| | - Mireia Gomez-Duro
- Institut Curie, Paris Sciences & Letters Research University, CNRS, UMR144, Structure and Membrane Compartments, Paris Cedex 0575248, France
| | - Ilse Hurbain
- Institut Curie, Paris Sciences & Letters Research University, CNRS, UMR144, Structure and Membrane Compartments, Paris Cedex 0575248, France
- Institut Curie, Paris Sciences & Letters Research University, CNRS, UMR144, Cell and Tissue Imaging Facility (The Cell and Tissue Imaging Platform (PICT-IBiSA)), Paris Cedex 0575248, France
| | - Anne-Sophie Macé
- Institut Curie, Paris Sciences & Letters Research University, CNRS, UMR144, Structure and Membrane Compartments, Paris Cedex 0575248, France
- Institut Curie, Paris Sciences & Letters Research University, CNRS, UMR144, Cell and Tissue Imaging Facility (The Cell and Tissue Imaging Platform (PICT-IBiSA)), Paris Cedex 0575248, France
| | - Graça Raposo
- Institut Curie, Paris Sciences & Letters Research University, CNRS, UMR144, Structure and Membrane Compartments, Paris Cedex 0575248, France
- Institut Curie, Paris Sciences & Letters Research University, CNRS, UMR144, Cell and Tissue Imaging Facility (The Cell and Tissue Imaging Platform (PICT-IBiSA)), Paris Cedex 0575248, France
| | - Gisela D’Angelo
- Institut Curie, Paris Sciences & Letters Research University, CNRS, UMR144, Structure and Membrane Compartments, Paris Cedex 0575248, France
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Chong S, Wei C, Feng L, Guo R. Silk Fibroin-Based Hydrogel Microneedles Deliver α-MSH to Promote Melanosome Delivery for Vitiligo Treatment. ACS Biomater Sci Eng 2023. [PMID: 37115665 DOI: 10.1021/acsbiomaterials.3c00284] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/29/2023]
Abstract
Microneedles have shown great advantages in subcutaneous drug delivery and skin disease treatment. Vitiligo is a difficult-to-cure skin disease characterized by the depigmentation of the epidermis. Melanosomes produced in melanocytes are transported through dendrites to adjacent keratinocytes, where they accumulate, resulting in skin pigmentation. However, melanocytes in vitiligo patients are functionally disrupted. Silk fibroin (SF) methacrylate hydrogel microneedle can deliver α-MSH to the epidermis directly, where α-MSH helps the protection of melanocytes, extension of melanocytic dendrites, and transfer of melanosomes. In addition, the expression of melanogenesis-related melanocyte-inducing transcription factor and tyrosinase-related protein 1 (TRP1) was up-regulated, and the number of hair follicle stem cells increased with good proliferative activity. This slow release α-MSH SF-based hydrogel microneedles provides a new idea for the treatment of vitiligo.
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Affiliation(s)
- Shubin Chong
- Department of Dermatology, Sixth Affiliated Hospital of South China University of Technology, Foshan 528200, China
| | - Chengxiu Wei
- Key Laboratory of Biomaterials of Guangdong Higher Education Institutes, Guangdong Provincial Engineering and Technological Research Centre for Drug Carrier Development, Department of Biomedical Engineering, Jinan University, Guangzhou 510632, China
| | - Longbao Feng
- Key Laboratory of Biomaterials of Guangdong Higher Education Institutes, Guangdong Provincial Engineering and Technological Research Centre for Drug Carrier Development, Department of Biomedical Engineering, Jinan University, Guangzhou 510632, China
| | - Rui Guo
- Key Laboratory of Biomaterials of Guangdong Higher Education Institutes, Guangdong Provincial Engineering and Technological Research Centre for Drug Carrier Development, Department of Biomedical Engineering, Jinan University, Guangzhou 510632, China
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4
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Sun Q, Lee W, Hu H, Ogawa T, De Leon S, Katehis I, Lim CH, Takeo M, Cammer M, Taketo MM, Gay DL, Millar SE, Ito M. Dedifferentiation maintains melanocyte stem cells in a dynamic niche. Nature 2023; 616:774-782. [PMID: 37076619 PMCID: PMC10132989 DOI: 10.1038/s41586-023-05960-6] [Citation(s) in RCA: 26] [Impact Index Per Article: 26.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2022] [Accepted: 03/16/2023] [Indexed: 04/21/2023]
Abstract
For unknow reasons, the melanocyte stem cell (McSC) system fails earlier than other adult stem cell populations1, which leads to hair greying in most humans and mice2,3. Current dogma states that McSCs are reserved in an undifferentiated state in the hair follicle niche, physically segregated from differentiated progeny that migrate away following cues of regenerative stimuli4-8. Here we show that most McSCs toggle between transit-amplifying and stem cell states for both self-renewal and generation of mature progeny, a mechanism fundamentally distinct from those of other self-renewing systems. Live imaging and single-cell RNA sequencing revealed that McSCs are mobile, translocating between hair follicle stem cell and transit-amplifying compartments where they reversibly enter distinct differentiation states governed by local microenvironmental cues (for example, WNT). Long-term lineage tracing demonstrated that the McSC system is maintained by reverted McSCs rather than by reserved stem cells inherently exempt from reversible changes. During ageing, there is accumulation of stranded McSCs that do not contribute to the regeneration of melanocyte progeny. These results identify a new model whereby dedifferentiation is integral to homeostatic stem cell maintenance and suggest that modulating McSC mobility may represent a new approach for the prevention of hair greying.
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Affiliation(s)
- Qi Sun
- The Ronald O. Perelman Department of Dermatology and Department of Cell Biology, New York University Grossman School of Medicine, New York, NY, USA
| | - Wendy Lee
- The Ronald O. Perelman Department of Dermatology and Department of Cell Biology, New York University Grossman School of Medicine, New York, NY, USA
| | - Hai Hu
- The Ronald O. Perelman Department of Dermatology and Department of Cell Biology, New York University Grossman School of Medicine, New York, NY, USA
| | - Tatsuya Ogawa
- The Ronald O. Perelman Department of Dermatology and Department of Cell Biology, New York University Grossman School of Medicine, New York, NY, USA
| | - Sophie De Leon
- The Ronald O. Perelman Department of Dermatology and Department of Cell Biology, New York University Grossman School of Medicine, New York, NY, USA
| | - Ioanna Katehis
- The Ronald O. Perelman Department of Dermatology and Department of Cell Biology, New York University Grossman School of Medicine, New York, NY, USA
| | - Chae Ho Lim
- The Ronald O. Perelman Department of Dermatology and Department of Cell Biology, New York University Grossman School of Medicine, New York, NY, USA
| | - Makoto Takeo
- The Ronald O. Perelman Department of Dermatology and Department of Cell Biology, New York University Grossman School of Medicine, New York, NY, USA
| | - Michael Cammer
- Division of Advanced Research Technologies, New York University Grossman School of Medicine, New York, NY, USA
| | - M Mark Taketo
- Colon Cancer Program, Kyoto University Hospital-iACT, Kyoto University, Kyoto, Japan
| | - Denise L Gay
- The Ronald O. Perelman Department of Dermatology and Department of Cell Biology, New York University Grossman School of Medicine, New York, NY, USA
- DLGBioLogics, Paris, France
| | - Sarah E Millar
- Black Family Stem Cell Institute, Department of Cell, Developmental and Regenerative Biology and Department of Dermatology, Icahn School of Medicine at Mount Sinai, New York, NY, USA
| | - Mayumi Ito
- The Ronald O. Perelman Department of Dermatology and Department of Cell Biology, New York University Grossman School of Medicine, New York, NY, USA.
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5
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El Mir J, Fedou S, Thézé N, Morice-Picard F, Cario M, Fayyad-Kazan H, Thiébaud P, Rezvani HR. Xenopus: An in vivo model for studying skin response to ultraviolet B irradiation. Dev Growth Differ 2023; 65:194-202. [PMID: 36880984 DOI: 10.1111/dgd.12848] [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: 05/28/2022] [Revised: 02/25/2023] [Accepted: 02/27/2023] [Indexed: 03/08/2023]
Abstract
Ultraviolet B (UVB) in sunlight cause skin damage, ranging from wrinkles to photoaging and skin cancer. UVB can affect genomic DNA by creating cyclobutane pyrimidine dimers (CPDs) and pyrimidine-pyrimidine (6-4) photoproducts (6-4PPs). These lesions are mainly repaired by the nucleotide excision repair (NER) system and by photolyase enzymes that are activated by blue light. Our main goal was to validate the use of Xenopus laevis as an in vivo model system for investigating the impact of UVB on skin physiology. The mRNA expression levels of xpc and six other genes of the NER system and CPD/6-4PP photolyases were found at all stages of embryonic development and in all adult tissues tested. When examining Xenopus embryos at different time points after UVB irradiation, we observed a gradual decrease in CPD levels and an increased number of apoptotic cells, together with an epidermal thickening and an increased dendricity of melanocytes. We observed a quick removal of CPDs when embryos are exposed to blue light versus in the dark, confirming the efficient activation of photolyases. A decrease in the number of apoptotic cells and an accelerated return to normal proliferation rate was noted in blue light-exposed embryos compared with their control counterparts. Overall, a gradual decrease in CPD levels, detection of apoptotic cells, thickening of epidermis, and increased dendricity of melanocytes, emulate human skin responses to UVB and support Xenopus as an appropriate and alternative model for such studies.
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Affiliation(s)
- Joudi El Mir
- University Bordeaux, Inserm, BRIC, Bordeaux, France
| | | | - Nadine Thézé
- University Bordeaux, Inserm, BRIC, Bordeaux, France
| | - Fanny Morice-Picard
- University Bordeaux, Inserm, BRIC, Bordeaux, France.,Department of Dermatology and Pediatric Dermatology, National Reference Centre for Rare Disorders, Hôpital des Enfants Pellegrin, Centre Hospitalier Universitaire de Bordeaux, Bordeaux, France
| | - Muriel Cario
- University Bordeaux, Inserm, BRIC, Bordeaux, France.,Aquiderm, University of Bordeaux, Bordeaux, France
| | - Hussein Fayyad-Kazan
- Laboratory of Cancer Biology and Molecular Immunology, Faculty of Sciences I, Lebanese University, Hadath, Lebanon
| | | | - Hamid-Reza Rezvani
- University Bordeaux, Inserm, BRIC, Bordeaux, France.,Aquiderm, University of Bordeaux, Bordeaux, France
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6
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Goenka S, Simon SR. Comparative study of doxycycline, sancycline, and 4-dedimethylamino sancycline (CMT-3) on epidermal melanogenesis. Arch Dermatol Res 2023; 315:249-257. [PMID: 34751807 DOI: 10.1007/s00403-021-02297-w] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2020] [Revised: 10/07/2021] [Accepted: 10/26/2021] [Indexed: 12/31/2022]
Abstract
Melanogenesis is regulated by melanocytes, which synthesize the pigment melanin inside melanosomes; these melanosomes are exported through dendritic extensions to adjacent keratinocytes and result in skin coloration. Chemically modified tetracyclines (CMTs) are nonantimicrobial tetracyclines that retain the capacity to inhibit matrix metalloproteinases (MMPs) and have shown several biological benefits; in particular, CMT-3 [(4-dedimethylamino sancycline (SAN)] has emerged as a candidate for therapeutic benefits in our previous studies. However, to date, studies of the effects of CMT-3 or SAN on melanogenesis are lacking. We have previously reported the anti-melanogenic activity of CMT-308 (the 9-amino derivative of CMT-3). Herein, we have compared the three tetracycline analogs, doxycycline (DOX), SAN, and CMT-3, for their effects on melanogenesis using B16F10 mouse melanoma cells and have validated results in primary human melanocytes (HEMn-DP). DOX did not show any significant effects on intracellular melanin or melanosome export in DP cells while SAN was cytotoxic at high doses but without effects on melanogenesis at lower doses. However, CMT-3 showed a robust suppression of dendricity parameters (dendrite number, dendrite length, and proportion of dendritic cells) in DP cells which was associated, at least in part, with a significant reduction of intracellular tyrosinase activity. In spite of its inhibition of tyrosinase activity, CMT-3 had no significant effects on intracellular melanin levels, suggesting that it selectively targets melanosome export. Our results demonstrate a unique structure-activity relationship (SAR) for the effects of these compounds on melanogenesis and support the conclusion that removal of the 4-dimethylamino moiety confers the selective capacity to suppress melanosome export. Collectively, these results indicate that CMT-3 might be a candidate for diminishing hyperpigmentation skin disorders.
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Affiliation(s)
- Shilpi Goenka
- Department of Biomedical Engineering, Stony Brook University, Stony Brook, NY, 11794-5281, USA.
| | - Sanford R Simon
- Department of Biomedical Engineering, Stony Brook University, Stony Brook, NY, 11794-5281, USA
- Department of Biochemistry and Cell Biology, Stony Brook University, Stony Brook, NY, USA
- Department of Pathology, Stony Brook University, Stony Brook, NY, USA
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7
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Goenka S. Comparative Study of Δ9-Tetrahydrocannabinol and Cannabidiol on Melanogenesis in Human Epidermal Melanocytes from Different Pigmentation Phototypes: A Pilot Study. J Xenobiot 2022; 12:131-144. [PMID: 35736025 PMCID: PMC9224588 DOI: 10.3390/jox12020012] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2022] [Revised: 05/21/2022] [Accepted: 06/06/2022] [Indexed: 11/26/2022] Open
Abstract
Δ9-tetrahydrocannabinol (THC) is one of the primary ingredients of cannabis plants and is responsible for the psychoactive properties of cannabis. While cannabidiol (CBD), the non-psychoactive compound from cannabis, has been shown to stimulate human epidermal melanogenesis, the effects of THC have not been addressed in human epidermal melanocytes. Moreover, to date, no study has tested the effects of these compounds on melanocytes differing in pigmentation, representative of different skin phototypes, which would be significant as different ethnicities are known to differentially metabolize these xenobiotics. Herein, the effects of THC were studied and compared alongside CBD in human epidermal melanocytes derived from lightly-pigmented (HEMn-LP; Caucasian) and darkly-pigmented (HEMn-DP; African-American) cells over a chronic exposure of 6 d. Results demonstrated that both compounds displayed cytotoxicity at 4 µM but stimulated melanin synthesis and tyrosinase activity in a similar manner in LP and DP cells at nontoxic concentrations of 1-2 µM. However, THC and CBD showed a differential effect on dendricity in both cells; THC and CBD reversibly increased dendricity in LP cells while there was no significant change in DP cells. THC and CBD induced higher levels of reactive oxygen species (ROS) in LP cells while there was no change in the ROS levels in DP cells. In summary, although THC was relatively less cytotoxic as compared to CBD to both LP and DP cells, it exhibited a similar capacity as CBD to stimulate melanin synthesis and export in LP cells which was accompanied by a significant oxidative stress. DP cells were relatively resistant to the effects of both THC and CBD which might implicate the protective effects conferred by melanin in dark-skinned individuals.
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Affiliation(s)
- Shilpi Goenka
- Department of Biomedical Engineering, Stony Brook University, Stony Brook, NY 11794-5281, USA;
- Department of Biochemistry and Cell Biology, Stony Brook University, Stony Brook, NY 11794-5281, USA
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8
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Hou X, Shi J, Sun L, Song L, Zhao W, Xiong X, Lu Y. The involvement of ERK1/2 and p38 MAPK in the premature senescence of melanocytes induced by H 2O 2 through a p53-independent p21 pathway. J Dermatol Sci 2022; 105:88-97. [PMID: 35042627 DOI: 10.1016/j.jdermsci.2022.01.002] [Citation(s) in RCA: 12] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2020] [Revised: 11/30/2021] [Accepted: 01/05/2022] [Indexed: 12/14/2022]
Abstract
BACKGROUND The pathogenesis of vitiligo is still unknown and oxidative stress is an important factor that can damage or incapacitate melanocytes. OBJECTIVE To investigate the role of oxidative stress in the premature senescence of melanocytes and their transfer of melanosomes. METHODS Cultured human melanocytes were treated with H2O2 after which cell viability and apoptosis were assessed. We investigated whether exposure to H2O2 induces premature senescence. RNA sequencing was used to screen aging-related signaling pathways. The expression of dendritic regulatory proteins, adhesion molecules and cell cytoskeletal proteins, as well as melanosome distribution were characterized. The ROS scavenger NAC was used to study the role of ROS in cell senescence and in melanosome transfer. RESULTS Cell viability decreased progressively and cell apoptosis increased after treatment with H2O2. H2O2 treatment tended to induce premature senescence in melanocytes through a p53-independent p21 pathway. RNA sequencing analysis showed that H2O2 treatment induced the differential expression of MAPK signaling pathway components. Western blotting and qRT-PCR confirmed that H2O2 treatment increased the phosphorylation of ERK1/2 and p38 MAPK, which are involved in inducing the senescence of melanocytes, but not JNK. The expression of cell cytoskeleton and adhesion molecules decreased after H2O2 treatment. p21 siRNA treatment reversed these changes. Treatment with NAC improved the premature senescence and the impaired melanosome transfer induced by H2O2. CONCLUSION H2O2 increases ROS levels, which activates the ERK1/2 and p38 MAPK pathways to induce the premature senescence of melanocytes through p21 via a p53-independent pathway and consequently disrupts melanosome transfer.
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Affiliation(s)
- Xiaoyuan Hou
- Department of Dermatology, the First Affiliated Hospital of Nanjing Medical University, Nanjing 210029, China.
| | - Jiaqi Shi
- Department of Dermatology, the First Affiliated Hospital of Nanjing Medical University, Nanjing 210029, China.
| | - Li Sun
- Department of Dermatology, the First Affiliated Hospital of Nanjing Medical University, Nanjing 210029, China.
| | - Lebin Song
- Department of Dermatology, the First Affiliated Hospital of Nanjing Medical University, Nanjing 210029, China.
| | - Wene Zhao
- Nanjing Medical University, Analysis and Testing Center, Nanjing 210029, China.
| | - Xixi Xiong
- Department of Dermatology, the First Affiliated Hospital of Nanjing Medical University, Nanjing 210029, China.
| | - Yan Lu
- Department of Dermatology, the First Affiliated Hospital of Nanjing Medical University, Nanjing 210029, China.
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9
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Inhibitory effect of CADI on melanin transfer in the B16F10-HaCAT cells co-culture system and anti-melanogenesis of CNCE in zebrafish. Process Biochem 2021. [DOI: 10.1016/j.procbio.2021.03.024] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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10
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Lim D, Lee KJ, Kim Y, Kim M, Ju HM, Kim MJ, Choi DH, Choi J, Kim S, Kang D, Lee K, Hahn JH. A Basic Domain-Derived Tripeptide Inhibits MITF Activity by Reducing its Binding to the Promoter of Target Genes. J Invest Dermatol 2021; 141:2459-2469. [PMID: 33823181 DOI: 10.1016/j.jid.2021.01.037] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2020] [Revised: 12/23/2020] [Accepted: 01/20/2021] [Indexed: 12/28/2022]
Abstract
The keratinocytes in UV-irradiated skin produce and secrete α-melanocyte-stimulating hormone. α-Melanocyte-stimulating hormone upregulates the expression of MITF in melanocytes through the cAMP‒protein kinase A‒CREB signaling pathway. Thereafter, MITF induces the expression of melanogenic genes, including the tyrosinase gene TYR and TYRP-1 and TYRP-2 genes, which leads to the synthesis and accumulation of melanin. In this study, we examined whether MITF basic region-derived tripeptides can bind to the DNA-binding domain of MITF and inhibit MITF-induced melanogenesis through the inhibition of MITF‒DNA binding. MITF-KGR, a representative MITF-derived tripeptide, suppressed the transcriptional activity of MITF by disrupting its binding to the promoter region of the target genes, which resulted in the inhibition of skin epidermis thickness and melanin synthesis in vivo and in vitro. Our results indicate that MITF-KGR exerts an inhibitory effect on melanogenesis by targeting MITF.
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Affiliation(s)
- Dongyoung Lim
- Department of Anatomy and Cell Biology, School of Medicine, Kangwon National University, Chuncheon, Republic of Korea
| | - Kyoung-Jin Lee
- Department of Anatomy and Cell Biology, School of Medicine, Kangwon National University, Chuncheon, Republic of Korea
| | - Yuri Kim
- Department of Anatomy and Cell Biology, School of Medicine, Kangwon National University, Chuncheon, Republic of Korea
| | - Minseo Kim
- Department of Anatomy and Cell Biology, School of Medicine, Kangwon National University, Chuncheon, Republic of Korea
| | - Hyun-Mi Ju
- Department of Anatomy and Cell Biology, School of Medicine, Kangwon National University, Chuncheon, Republic of Korea
| | - Myoung-Ju Kim
- Department of Anatomy and Cell Biology, School of Medicine, Kangwon National University, Chuncheon, Republic of Korea
| | - Dong-Hwa Choi
- Biocenter, Gyeonggido Business & Science Accelerator, Suwon, Republic of Korea
| | - Jiwon Choi
- Department of Oral Pathology, Oral Cancer Research Institute, College of Dentistry, Yonsei University, Seoul, Republic of Korea
| | - Suree Kim
- Department of Life Science, Ewha Womans University, Seoul, Republic of Korea; Western Seoul Center, Korea Basic Science Institute, Seoul, Republic of Korea
| | - Dongmin Kang
- Department of Life Science, Ewha Womans University, Seoul, Republic of Korea
| | - Kyoungyul Lee
- Department of Pathology, School of Medicine, Kangwon National University, Chuncheon, Republic of Korea
| | - Jang-Hee Hahn
- Department of Anatomy and Cell Biology, School of Medicine, Kangwon National University, Chuncheon, Republic of Korea.
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11
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Carney BC, Travis TE, Moffatt LT, Johnson LS, McLawhorn MM, Simbulan-Rosenthal CM, Rosenthal DS, Shupp JW. Hypopigmented burn hypertrophic scar contains melanocytes that can be signaled to re-pigment by synthetic alpha-melanocyte stimulating hormone in vitro. PLoS One 2021; 16:e0248985. [PMID: 33765043 PMCID: PMC7993611 DOI: 10.1371/journal.pone.0248985] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2020] [Accepted: 03/09/2021] [Indexed: 02/03/2023] Open
Abstract
There are limited treatments for dyschromia in burn hypertrophic scars (HTSs). Initial work in Duroc pig models showed that regions of scar that are light or dark have equal numbers of melanocytes. This study aims to confirm melanocyte presence in regions of hypo- and hyper-pigmentation in an animal model and patient samples. In a Duroc pig model, melanocyte presence was confirmed using en face staining. Patients with dyschromic HTSs had demographic, injury details, and melanin indices collected. Punch biopsies were taken of regions of hyper-, hypo-, or normally pigmented scar and skin. Biopsies were processed to obtain epidermal sheets (ESs). A subset of ESs were en face stained with melanocyte marker, S100β. Melanocytes were isolated from a different subset. Melanocytes were treated with NDP α-MSH, a pigmentation stimulator. mRNA was isolated from cells, and was used to evaluate gene expression of melanin-synthetic genes. In patient and pig scars, regions of hyper-, hypo-, and normal pigmentation had significantly different melanin indices. S100β en face staining showed that regions of hyper- and hypo-pigmentation contained the same number of melanocytes, but these cells had different dendricity/activity. Treatment of hypo-pigmented melanocytes with NDP α-MSH produced melanin by microscopy. Melanin-synthetic genes were upregulated in treated cells over controls. While traditionally it may be thought that hypopigmented regions of burn HTS display this phenotype because of the absence of pigment-producing cells, these data show that inactive melanocytes are present in these scar regions. By treating with a pigment stimulator, cells can be induced to re-pigment.
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Affiliation(s)
- Bonnie C. Carney
- Department of Biochemistry and Molecular and Cellular Biology, Georgetown University School of Medicine, Washington, DC, United States of America
- Firefighters’ Burn and Surgical Research Laboratory, MedStar Health Research Institute, Washington, DC, United States of America
- Department of Surgery, Georgetown University School of Medicine, Washington, DC, United States of America
| | - Taryn E. Travis
- Firefighters’ Burn and Surgical Research Laboratory, MedStar Health Research Institute, Washington, DC, United States of America
- Department of Surgery, Georgetown University School of Medicine, Washington, DC, United States of America
- Department of Surgery, The Burn Center, MedStar Washington Hospital Center, Washington, DC, United States of America
| | - Lauren T. Moffatt
- Department of Biochemistry and Molecular and Cellular Biology, Georgetown University School of Medicine, Washington, DC, United States of America
- Firefighters’ Burn and Surgical Research Laboratory, MedStar Health Research Institute, Washington, DC, United States of America
- Department of Surgery, Georgetown University School of Medicine, Washington, DC, United States of America
| | - Laura S. Johnson
- Firefighters’ Burn and Surgical Research Laboratory, MedStar Health Research Institute, Washington, DC, United States of America
- Department of Surgery, Georgetown University School of Medicine, Washington, DC, United States of America
- Department of Surgery, The Burn Center, MedStar Washington Hospital Center, Washington, DC, United States of America
| | - Melissa M. McLawhorn
- Firefighters’ Burn and Surgical Research Laboratory, MedStar Health Research Institute, Washington, DC, United States of America
| | - Cynthia M. Simbulan-Rosenthal
- Department of Biochemistry and Molecular and Cellular Biology, Georgetown University School of Medicine, Washington, DC, United States of America
| | - Dean S. Rosenthal
- Department of Biochemistry and Molecular and Cellular Biology, Georgetown University School of Medicine, Washington, DC, United States of America
| | - Jeffrey W. Shupp
- Department of Biochemistry and Molecular and Cellular Biology, Georgetown University School of Medicine, Washington, DC, United States of America
- Firefighters’ Burn and Surgical Research Laboratory, MedStar Health Research Institute, Washington, DC, United States of America
- Department of Surgery, Georgetown University School of Medicine, Washington, DC, United States of America
- Department of Surgery, The Burn Center, MedStar Washington Hospital Center, Washington, DC, United States of America
- * E-mail:
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12
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A Novel Pro-Melanogenic Effect of Standardized Dry Olive Leaf Extract on Primary Human Melanocytes from Lightly Pigmented and Moderately Pigmented Skin. Pharmaceuticals (Basel) 2021; 14:ph14030252. [PMID: 33799651 PMCID: PMC7999707 DOI: 10.3390/ph14030252] [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] [Received: 02/10/2021] [Revised: 03/04/2021] [Accepted: 03/07/2021] [Indexed: 12/13/2022] Open
Abstract
Benolea® (EFLA®943) is a standardized dry olive leaf extract (DOLE) considered safe for food consumption and has demonstrated superior pharmaceutical benefits such as antioxidant, anti-obesity, and anti-hypertensive activities. However, there is no study on its effects on melanogenesis yet. Disruption in the sequence of steps in melanogenesis can lead to hypopigmentary disorders which occur due to reduced production or export of pigment melanin in the skin. There is a need for safe and nontoxic therapeutics for the treatment of hypopigmentation disorders. Herein, we studied the effects of DOLE over a concentration range of 10-200 µg/mL on melanin synthesis and melanin secretion in B16F10 mouse melanoma cells and MNT-1 human melanoma cells and validated our results in primary human melanocytes (obtained from lightly pigmented (LP) and moderately pigmented (MP) cells) as well as their cocultures with keratinocytes. The capacity of melanocytes to export melanosomes was also estimated indirectly by the quantitation of melanocyte dendrite lengths and numbers. Our results show that DOLE significantly enhanced levels of extracellular melanin in the absence of effects on intracellular melanin, demonstrating that this plant extract's pro-melanogenic activity is primarily based on its capacity to augment melanin secretion and stimulate melanocyte dendricity. In summary, our preliminary results demonstrate that DOLE may hold promise as a pro-pigmenting agent for vitiligo therapy and gray hair treatment by its exclusive and novel mechanism of functioning as a dendrite elongator. Further studies to elucidate the mechanisms of action of the pro-melanogenic activity and effects of DOLE on melanosome export as well as the last steps of melanogenesis are warranted.
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13
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Choi SG, Kim JH, Hong SH, Lee OY, Kang NG. Exogenous pyruvate alleviates UV-induced hyperpigmentation via restraining dendrite outgrowth and Rac1 GTPase activity. J Dermatol Sci 2020; 101:101-106. [PMID: 33277142 DOI: 10.1016/j.jdermsci.2020.11.006] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2020] [Revised: 10/05/2020] [Accepted: 11/10/2020] [Indexed: 10/23/2022]
Abstract
BACKGROUND Melanin is synthesized in melanocytes and transferred to keratinocytes through dendrites. Endogenous pyruvate is a key metabolite for ATP production in glycolysis, and the tricarboxylic acid (TCA) cycle and exogenous pyruvate provide protection against oxidative stress and acidosis in the intercellular space. The function of pyruvate in the regulation of dendrite outgrowth remains to be elucidated. OBJECTIVE We examined the effect of pyruvate on dendritic elongation and skin pigmentation METHODS: Murine B16F10 melanoma cells and human primary melanocytes were used for in vitro analysis. Melanin quantitation and histochemical staining were performed in a 3D pigmented human skin model. RESULTS We demonstrated the participation of monocarboxylate transporters (MCTs) responsible for the membrane transport of pyruvate in B16F10 melanoma cells. The accumulation of pyruvate occurred in a pH-dependent manner, which was highly sensitive to a specific MCT inhibitor (α-cyano-4-hydroxycinnamic acid). α-MSH-induced morphological changes, including dendrite elongation and growth-cone-like structure, were diminished in B16F10 cells upon treatment with pyruvate. In addition, the number of dendrite branches was reduced in normal human epidermal melanocytes. As the Rho-subfamily of monomeric GTP-binding proteins modulates dendrite formation, we subsequently examined the suppression of Rac1 activation by pyruvate, but not RhoA and Cdc42. Furthermore, pyruvate showed anti-melanogenic effects against UV-induced pigmentation in reconstructed pigmented epidermis, established by co-seeding autologous melanocytes and keratinocytes, which act similar to in vivo skin tissue. CONCLUSION These results suggest that pyruvate treatment may be an alternative or additive therapeutic strategy to prevent hyperpigmentation.
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Affiliation(s)
- Seon-Guk Choi
- R&D Center of LG Household and Health Care, Ltd., Seoul, Republic of Korea.
| | - Jin-Hyun Kim
- R&D Center of LG Household and Health Care, Ltd., Seoul, Republic of Korea
| | - Seong-Heon Hong
- R&D Center of LG Household and Health Care, Ltd., Seoul, Republic of Korea
| | - Oun Young Lee
- R&D Center of LG Household and Health Care, Ltd., Seoul, Republic of Korea
| | - Nae-Gyu Kang
- R&D Center of LG Household and Health Care, Ltd., Seoul, Republic of Korea
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14
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CMT-308, a Nonantimicrobial Chemically-Modified Tetracycline, Exhibits Anti-Melanogenic Activity by Suppression of Melanosome Export. Biomedicines 2020; 8:biomedicines8100411. [PMID: 33066033 PMCID: PMC7601524 DOI: 10.3390/biomedicines8100411] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2020] [Revised: 10/09/2020] [Accepted: 10/10/2020] [Indexed: 12/15/2022] Open
Abstract
CMT-308 is a nonantimicrobial chemically-modified tetracycline (CMT), which we have previously shown exhibits antifungal activity and pleiotropic anti-inflammatory activities, including inhibition of the enzymatic activity of matrix metalloproteinases (MMPs). Based on its chemical structure, we hypothesized that CMT-308 could inhibit melanogenesis and might be a candidate for the treatment of skin hyperpigmentation disorders which occur due to unregulated melanin biosynthesis and/or transport. CMT-308 was first studied for any effects on activity of the enzyme tyrosinase in vitro using a purified preparation of mushroom tyrosinase; the mode of inhibition of the soluble fungal enzyme was evaluated by Lineweaver-Burk and Dixon plots as well as by non-linear least squares fitting. Next, the effects of CMT-308 were tested in mammalian cell cultures using B16F10 mouse melanoma cells and further validated in darkly-pigmented human melanocytes (HEMn-DP). Our results showed that micromolar concentrations of CMT-308 inhibited mushroom tyrosinase enzyme activity, using the first two substrates in the melanogenesis pathway (l-tyrosine and l-3,4-dihydroxyphenylalanine (l-DOPA)); CMT-308 inhibited mushroom tyrosinase primarily via a mixed mode of inhibition, with the major contribution from a competitive mode. In B16F10 cell cultures, CMT-308 (10 µM) significantly diminished total melanin levels with a selective reduction of extracellular melanin levels, under both basal and hormone-stimulated conditions without any cytotoxicity over a duration of 72 h. Studies of potential mechanisms of inhibition of melanogenesis in B16F10 cells showed that, in mammalian cells, CMT-308 did not inhibit intracellular tyrosinase activity or the activity of α-glucosidase, an enzyme that regulates maturation of tyrosinase. However, CMT-308 suppressed MITF protein expression in B16F10 cells and showed copper chelating activity and antioxidant activity in a cell-free system. The significantly lower extracellular melanin levels obtained at 10 µM indicate that CMT-308’s anti-melanogenic action may be attributed to a selective inhibition of melanosome export with the perinuclear aggregation of melanosomes, rather than a direct effect on the tyrosinase-catalyzed steps in melanin biosynthesis. These results were validated in HEMn-DP cells where CMT-308 suppressed dendricity in a fully reversible manner without affecting intracellular melanin synthesis. Furthermore, the capacity of CMT-308 to inhibit melanosome export was retained in cocultures of HEMn-DP and HaCaT. In summary, our results offer promise for therapeutic strategies to combat the effects of hyperpigmentation by use of CMT-308 at low micromolar concentrations.
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15
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Goenka S, R. Simon S. Asoprisnil, a Selective Progesterone Receptor Modulator (SPRM), Inhibits Melanosome Export in B16F10 Cells and HEMn-DP Melanocytes. Molecules 2020; 25:E3581. [PMID: 32781695 PMCID: PMC7465349 DOI: 10.3390/molecules25163581] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2020] [Revised: 08/04/2020] [Accepted: 08/04/2020] [Indexed: 12/17/2022] Open
Abstract
Previous studies have reported that estrogen hormone promotes melanogenesis while progesterone inhibits it. A selective estrogen receptor modulator (SERM), tamoxifen, has been shown to promote melanogenesis; however, to date, there have been no reports on the effects of a selective progesterone receptor modulator (SPRM) on melanogenesis. In the present study, we hypothesized that asoprisnil (AP), a SPRM, inhibits melanogenesis. AP was tested for cytotoxicity to B16F10 mouse melanoma cells for screening the nontoxic concentrations using MTS cytotoxicity assay. Extracellular and intracellular melanin levels were estimated at nontoxic concentrations of AP. To evaluate the direct effect of AP on tyrosinase enzyme, tyrosinase activity and copper chelating activities were measured. Next, the effects of AP on melanogenesis were tested in normal human melanocytes, neonatal, darkly pigmented (HEMn-DP). Our results demonstrate that AP was nontoxic at a concentration range of 10-50 μM in B16F10 cells; AP at 50 μM significantly suppressed extracellular melanin levels comparable to kojic acid at 500 μM, with no significant effect on intracellular melanin levels. The mechanism of melanogenesis inhibition was studied to assess if AP downregulated tyrosinase activity in cell lysates or in a cell-free system. However, AP was found to increase intracellular tyrosinase activity without any effect on tyrosinase enzyme activity or copper chelating activity in a cell-free system, indicating that AP inhibits melanogenesis by mechanisms other than direct effects on tyrosinase enzyme activity. The capacity of AP to inhibit melanosome export was further validated in HEMn-DP cells; AP significantly suppressed dendricity at concentrations of 20 and 30 μM in the absence of effects on melanin synthesis or intracellular tyrosinase activity. In addition, AP was nontoxic to human keratinocytes (HaCaT) at these concentrations, validating its safety for topical use. Taken together, our preliminary results demonstrate that AP might be repurposed as a candidate therapeutic for treatment of hyperpigmentation disorders via a unique mechanism, which encompasses a selective inhibition of melanosome export.
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Affiliation(s)
- Shilpi Goenka
- Department of Biomedical Engineering, Stony Brook University, Stony Brook, NY 11794-5281, USA;
| | - Sanford R. Simon
- Department of Biomedical Engineering, Stony Brook University, Stony Brook, NY 11794-5281, USA;
- Department of Pathology, Stony Brook University, Stony Brook, NY 11794-5281, USA
- Department of Biochemistry and Cellular Biology, Stony Brook University, Stony Brook, NY 11794-5281, USA
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16
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Domingues L, Hurbain I, Gilles-Marsens F, Sirés-Campos J, André N, Dewulf M, Romao M, Viaris de Lesegno C, Macé AS, Blouin C, Guéré C, Vié K, Raposo G, Lamaze C, Delevoye C. Coupling of melanocyte signaling and mechanics by caveolae is required for human skin pigmentation. Nat Commun 2020; 11:2988. [PMID: 32532976 PMCID: PMC7293304 DOI: 10.1038/s41467-020-16738-z] [Citation(s) in RCA: 24] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2019] [Accepted: 05/15/2020] [Indexed: 12/17/2022] Open
Abstract
Tissue homeostasis requires regulation of cell-cell communication, which relies on signaling molecules and cell contacts. In skin epidermis, keratinocytes secrete factors transduced by melanocytes into signaling cues promoting their pigmentation and dendrite outgrowth, while melanocytes transfer melanin pigments to keratinocytes to convey skin photoprotection. How epidermal cells integrate these functions remains poorly characterized. Here, we show that caveolae are asymmetrically distributed in melanocytes and particularly abundant at the melanocyte-keratinocyte interface in epidermis. Caveolae in melanocytes are modulated by ultraviolet radiations and keratinocytes-released factors, like miRNAs. Preventing caveolae formation in melanocytes increases melanin pigment synthesis through upregulation of cAMP signaling and decreases cell protrusions, cell-cell contacts, pigment transfer and epidermis pigmentation. Altogether, we identify that caveolae serve as molecular hubs that couple signaling outputs from keratinocytes to mechanical plasticity of pigment cells. The coordination of intercellular communication and contacts by caveolae is thus crucial to skin pigmentation and tissue homeostasis.
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Affiliation(s)
- Lia Domingues
- Institut Curie, PSL Research University, CNRS, UMR144, Structure and Membrane Compartments, 75005, Paris, France.
| | - Ilse Hurbain
- Institut Curie, PSL Research University, CNRS, UMR144, Structure and Membrane Compartments, 75005, Paris, France
- Institut Curie, PSL Research University, CNRS, UMR144, Cell and Tissue Imaging Facility (PICT-IBiSA), 75005, Paris, France
| | - Floriane Gilles-Marsens
- Institut Curie, PSL Research University, CNRS, UMR144, Structure and Membrane Compartments, 75005, Paris, France
- Institut NeuroMyoGene, UCBL1, UMR 5310, INSERM U1217, Génétique et Neurobiologie de C. Elegans, Faculté de Médecine et de Pharmacie, 8 Avenue Rockefeller, 69008, Lyon, France
| | - Julia Sirés-Campos
- Institut Curie, PSL Research University, CNRS, UMR144, Structure and Membrane Compartments, 75005, Paris, France
| | - Nathalie André
- Laboratoire Clarins, 5 rue Ampère, 95000, Pontoise, France
| | - Melissa Dewulf
- Institut Curie, PSL Research University, INSERM U1143, CNRS UMR 3666, Membrane Mechanics and Dynamics of Intracellular Signaling Laboratory, 75005, Paris, France
| | - Maryse Romao
- Institut Curie, PSL Research University, CNRS, UMR144, Structure and Membrane Compartments, 75005, Paris, France
- Institut Curie, PSL Research University, CNRS, UMR144, Cell and Tissue Imaging Facility (PICT-IBiSA), 75005, Paris, France
| | - Christine Viaris de Lesegno
- Institut Curie, PSL Research University, INSERM U1143, CNRS UMR 3666, Membrane Mechanics and Dynamics of Intracellular Signaling Laboratory, 75005, Paris, France
| | - Anne-Sophie Macé
- Institut Curie, PSL Research University, CNRS, UMR144, Cell and Tissue Imaging Facility (PICT-IBiSA), 75005, Paris, France
| | - Cédric Blouin
- Institut Curie, PSL Research University, INSERM U1143, CNRS UMR 3666, Membrane Mechanics and Dynamics of Intracellular Signaling Laboratory, 75005, Paris, France
| | | | - Katell Vié
- Laboratoire Clarins, 5 rue Ampère, 95000, Pontoise, France
| | - Graça Raposo
- Institut Curie, PSL Research University, CNRS, UMR144, Structure and Membrane Compartments, 75005, Paris, France
- Institut Curie, PSL Research University, CNRS, UMR144, Cell and Tissue Imaging Facility (PICT-IBiSA), 75005, Paris, France
| | - Christophe Lamaze
- Institut Curie, PSL Research University, INSERM U1143, CNRS UMR 3666, Membrane Mechanics and Dynamics of Intracellular Signaling Laboratory, 75005, Paris, France
| | - Cédric Delevoye
- Institut Curie, PSL Research University, CNRS, UMR144, Structure and Membrane Compartments, 75005, Paris, France.
- Institut Curie, PSL Research University, CNRS, UMR144, Cell and Tissue Imaging Facility (PICT-IBiSA), 75005, Paris, France.
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Hermyt M, Janiszewska K, Rupik W. Squamate egg tooth development revisited using three-dimensional reconstructions of brown anole (Anolis sagrei, Squamata, Dactyloidae) dentition. J Anat 2020; 236:1004-1020. [PMID: 32056203 PMCID: PMC7219623 DOI: 10.1111/joa.13166] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2019] [Revised: 01/17/2020] [Accepted: 01/20/2020] [Indexed: 02/02/2023] Open
Abstract
The egg tooth is a hatching adaptation, characteristic of all squamates. In brown anole embryos, the first tooth that starts differentiating is the egg tooth. It develops from a single tooth germ and, similar to the regular dentition of all the other vertebrates, the differentiating egg tooth of the brown anole passes through classic morphological and developmental stages named according to the shape of the dental epithelium: epithelial thickening, dental lamina, tooth bud, cap and bell stages. The differentiating egg tooth consists of three parts: the enamel organ, hard tissues and dental pulp. Shortly before hatching, the egg tooth connects with the premaxilla. Attachment tissue of the egg tooth does not undergo mineralization, which makes it different from the other teeth of most squamates. After hatching, odontoclasts are involved in resorption of the egg tooth's remains. This study shows that the brown anole egg tooth does not completely conform to previous reports describing iguanomorph egg teeth and reveals a need to investigate its development in the context of squamate phylogeny.
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Affiliation(s)
- Mateusz Hermyt
- Faculty of Natural SciencesInstitute of Biology, Biotechnology and Environmental ProtectionUniversity of Silesia in KatowiceKatowicePoland
| | | | - Weronika Rupik
- Faculty of Natural SciencesInstitute of Biology, Biotechnology and Environmental ProtectionUniversity of Silesia in KatowiceKatowicePoland
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18
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Liu B, Zhang J, Hu S, Qi S, Jia Q, Yang W, Yang S, Ji K, Liu X, Dong C, Fan R. MicroRNA-379 mediates pigmentation, migration and proliferation of melanocytes by targeting the insulin-like growth factor 1 receptor. Exp Dermatol 2020; 29:467-476. [PMID: 32170969 DOI: 10.1111/exd.14095] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2019] [Revised: 02/24/2020] [Accepted: 03/08/2020] [Indexed: 12/22/2022]
Abstract
Melanogenesis, migration and proliferation of melanocytes are important factors that determine the hair colours of mammals. MicroRNAs (miRNAs) have been shown to be closely related to these processes. In melanocytes of alpacas, insulin-like growth factor 1 (IGF1) has been shown to improve melanogenesis through the cyclic AMP (cAMP) pathway. miR-379 was predicted to target insulin-like growth factor (IGF) receptor 1 (IGF1R), which binds to IGF1. Therefore, we hypothesized that miR-379 could mediate melanogenesis, migration and proliferation of melanocytes. Here, we report that miR-379 was highly expressed in alpaca melanocytes. Subsequent overexpression of miR-379 in alpaca melanocytes led to the generation of the phenotype of melanogenesis, proliferation and migration. In addition, the expression of genes related to these phenotypes in melanocytes was detected. Our results showed that miR-379 targets IGF1R in melanocytes. The overexpression of miR-379 stimulated dendrite extension or elongation and limited the perinuclear distribution of melanin, but inhibited melanogenesis via cAMP response element (CRE)-binding protein (CREB)/microphthalmia-associated transcription factor (MITF) pathway. miR-379 attenuated melanocyte migration by downregulating the focal adhesion kinase (FAK) and enhanced melanocyte proliferation by upregulating protein kinase B (AKT). These observations suggest the involvement of miR-379 in the physiological regulation of melanocytes, mediated by targeting IGF1R on insulin receptor (IR) compensation and subsequent crosstalk.
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Affiliation(s)
- Bo Liu
- College of Animal Science and Veterinary Medicine, Shanxi Agricultural University, Taigu, China
| | - Junzhen Zhang
- College of Animal Science and Veterinary Medicine, Shanxi Agricultural University, Taigu, China
| | - Shixiong Hu
- College of Animal Science and Veterinary Medicine, Shanxi Agricultural University, Taigu, China
| | - Shuhui Qi
- College of Animal Science and Veterinary Medicine, Shanxi Agricultural University, Taigu, China
| | - Qiong Jia
- College of Animal Science and Veterinary Medicine, Shanxi Agricultural University, Taigu, China
| | - Wanyun Yang
- College of Animal Science and Veterinary Medicine, Shanxi Agricultural University, Taigu, China
| | - Shanshan Yang
- College of Animal Science and Veterinary Medicine, Jiangxi Agricultural University, Nanchang, China
| | - Kaiyuan Ji
- College of Animal Science and Veterinary Medicine, Anhui Agricultural University, Hefei, China
| | - Xuexian Liu
- College of Animal Science and Veterinary Medicine, Shanxi Agricultural University, Taigu, China
| | - Changsheng Dong
- College of Animal Science and Veterinary Medicine, Shanxi Agricultural University, Taigu, China
| | - Ruiwen Fan
- College of Animal Science and Veterinary Medicine, Shanxi Agricultural University, Taigu, China
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Brás MM, Radmacher M, Sousa SR, Granja PL. Melanoma in the Eyes of Mechanobiology. Front Cell Dev Biol 2020; 8:54. [PMID: 32117980 PMCID: PMC7027391 DOI: 10.3389/fcell.2020.00054] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2019] [Accepted: 01/21/2020] [Indexed: 12/23/2022] Open
Abstract
Skin is the largest organ of the human body with several important functions that can be impaired by injury, genetic or chronic diseases. Among all skin diseases, melanoma is one of the most severe, which can lead to death, due to metastization. Mechanotransduction has a crucial role for motility, invasion, adhesion and metastization processes, since it deals with the response of cells to physical forces. Signaling pathways are important to understand how physical cues produced or mediated by the Extracellular Matrix (ECM), affect healthy and tumor cells. During these processes, several molecules in the nucleus and cytoplasm are activated. Melanocytes, keratinocytes, fibroblasts and the ECM, play a crucial role in melanoma formation. This manuscript will address the synergy among melanocytes, keratinocytes, fibroblasts cells and the ECM considering their mechanical contribution and relevance in this disease. Mechanical properties of melanoma cells can also be influenced by pigmentation, which can be associated with changes in stiffness. Mechanical changes can be related with the adhesion, migration, or invasiveness potential of melanoma cells promoting a high metastization capacity of this cancer. Mechanosensing, mechanotransduction, and mechanoresponse will be highlighted with respect to the motility, invasion, adhesion and metastization in melanoma cancer.
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Affiliation(s)
- M. Manuela Brás
- Instituto de Investigação e Inovação em Saúde, Universidade do Porto, Porto, Portugal
- Instituto de Engenharia Biomédica, Universidade do Porto, Porto, Portugal
- Faculdade de Engenharia, Universidade do Porto, Porto, Portugal
| | | | - Susana R. Sousa
- Instituto de Investigação e Inovação em Saúde, Universidade do Porto, Porto, Portugal
- Instituto de Engenharia Biomédica, Universidade do Porto, Porto, Portugal
- Instituto Superior de Engenharia do Porto, Instituto Politécnico do Porto, Porto, Portugal
| | - Pedro L. Granja
- Instituto de Investigação e Inovação em Saúde, Universidade do Porto, Porto, Portugal
- Instituto de Engenharia Biomédica, Universidade do Porto, Porto, Portugal
- Faculdade de Engenharia, Universidade do Porto, Porto, Portugal
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20
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Kim M, Lee CS, Lim KM. Rhododenol Activates Melanocytes and Induces Morphological Alteration at Sub-Cytotoxic Levels. Int J Mol Sci 2019; 20:ijms20225665. [PMID: 31726751 PMCID: PMC6888388 DOI: 10.3390/ijms20225665] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2019] [Revised: 11/06/2019] [Accepted: 11/07/2019] [Indexed: 12/11/2022] Open
Abstract
Rhododenol (RD), a whitening cosmetic ingredient, was withdrawn from the market due to RD-induced leukoderma (RIL). While many attempts have been made to clarify the mechanism underlying RIL, RIL has not been fully understood yet. Indeed, affected subjects showed uneven skin pigmentation, but the features are different from vitiligo, a skin hypopigmentary disorder, alluding to events more complex than simple melanocyte cytotoxicity. Here, we discovered that rhododenol treatment reduced the number of melanocytes in a pigmented 3D human skin model, Melanoderm™, confirming the melanocyte toxicity of RD. Of note, melanocytes that survived in the RD treated tissues exhibited altered morphology, such as extended dendrites and increased cell sizes. Consistently with this, sub-cytotoxic level of RD increased cell size and elongated dendrites in B16 melanoma cells. Morphological changes of B16 cells were further confirmed in the immunocytochemistry of treated cells for actin and tubulin. Even more provoking, RD up-regulated the expression of tyrosinase and TRP1 in the survived B16 cells. Evaluation of mRNA expression of cytoskeletal proteins suggests that RD altered the cytoskeletal dynamic favoring cell size expansion and melanosome maturation. Collectively, these results suggest that RD not only induces cytotoxicity in melanocytes but also can lead to a profound perturbation of melanocyte integrity even at sub-cytotoxic levels.
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Affiliation(s)
- Minjeong Kim
- College of Pharmacy, Ewha Womans University, Seoul 03760, Korea;
| | - Chang-Seok Lee
- Department of Beauty and Cosmetic Science, College of Health Science, Eulji University, Seongnam-si 13135, Korea
- Correspondence: (C.-S.L.); (K.-M.L.)
| | - Kyung-Min Lim
- College of Pharmacy, Ewha Womans University, Seoul 03760, Korea;
- Correspondence: (C.-S.L.); (K.-M.L.)
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21
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Dutta S, Panda S, Singh P, Tawde S, Mishra M, Andhale V, Athavale A, Keswani SM. Hypopigmentation in burns is associated with alterations in the architecture of the skin and the dendricity of the melanocytes. Burns 2019; 46:906-917. [PMID: 31685389 DOI: 10.1016/j.burns.2019.10.003] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2019] [Revised: 08/31/2019] [Accepted: 10/02/2019] [Indexed: 10/25/2022]
Abstract
Hypopigmentation is a major problem in deep dermal burns. To date, no standard treatment is available for the post burn hypopigmentation disorder. Therefore, understanding the molecular and cellular events are of benefit for therapeutic intervention. Hematoxylin and Eosin (H&E) and Fontana Masson (FM) staining of post burn hypopigmented skin (PBHS) showed an altered architectural pattern in cellular organization, cornified layer and melanin pigment as compared to the normal skin. This was confirmed by immunohistochemistry (IHC) analysis of PBHS samples using specific marker cytokeratin 5 (CK5) for keratinocytes and melanocortin 1 receptor (MCIR) for melanocytes. Validation of these observations was performed by IHC using proliferation and differentiation markers, Ki67 and Loricrin respectively and the melanocyte specific marker tyrosinase related protein 1 (TRP1). Taking a cue from the IHC study, the interaction of keratinocytes and melanocytes was studied by developing a co-culture model from PBHS and normal skin. Culture data exhibited a change of dendritic structure, reduced proliferation rate, faulty melanin synthesis and transfer of melanin from melanocytes to keratinocytes in PBHS samples. To the best of our knowledge, this is the first study showing structural and functional aberrations of melanocytes and keratinocytes, as a potential cause of hypopigmentation in burned patients. Our study, therefore, provides valuable insight for the basis of hypopigmentation in post burn patients, which may pave the way for clinical intervention in the future.
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Affiliation(s)
- Shruti Dutta
- National Burns Centre, Sector 13, Plot no 1, Airoli, Navi Mumbai, India
| | - Sangita Panda
- National Burns Centre, Sector 13, Plot no 1, Airoli, Navi Mumbai, India
| | - Prashant Singh
- National Burns Centre, Sector 13, Plot no 1, Airoli, Navi Mumbai, India
| | - Sumit Tawde
- National Burns Centre, Sector 13, Plot no 1, Airoli, Navi Mumbai, India
| | - Mamata Mishra
- National Burns Centre, Sector 13, Plot no 1, Airoli, Navi Mumbai, India
| | - Vikas Andhale
- National Burns Centre, Sector 13, Plot no 1, Airoli, Navi Mumbai, India
| | - Angira Athavale
- National Burns Centre, Sector 13, Plot no 1, Airoli, Navi Mumbai, India
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22
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Lv J, Fu Y, Gao R, Li J, Kang M, Song G, Yun C. Diazepam enhances melanogenesis, melanocyte dendricity and melanosome transport via the PBR/cAMP/PKA pathway. Int J Biochem Cell Biol 2019; 116:105620. [PMID: 31561018 DOI: 10.1016/j.biocel.2019.105620] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2019] [Revised: 09/16/2019] [Accepted: 09/23/2019] [Indexed: 12/13/2022]
Abstract
Diazepam is a medicament of the benzodiazepine family and it typically produces a sedative effect. Researchers have revealed that diazepam can induce melanogenesis and produce dendrite-like structures in B16 melanoma cells. However, the associated mechanisms of melanogenesis and phenotypic alterations have mostly remained unknown. In this study, we determined the effects of diazepam on melanogenesis, cellular phenotypic alterations, the location of melanosomes and the expression of relevant proteins in melanocytes using Masson-Fontana ammoniacal silver staining, scanning electron microscopy, immunocytochemistry and western blot analysis. Our results collectively indicated that diazepam had a pivotal role in melanocytes by enhancing melanin synthesis, melanocyte dendricity, melanosome trafficking, and capture at the dendrite tips. These functions might be attributed to the fact that diazepam activated the peripheral benzodiazepine receptor (PBR). This increased intracellular levels of cAMP, which stimulated the phosphorylation of cAMP response element-binding (CREB). As a result, this increased the tyrosinase, microphthalmia-associated transcription factor (MITF), Rab27a, Myosin Va, Rab17 and Cdc42 expression. This caused melanogenesis and melanosome transport. Therefore, our findings may provide a potential strategy for treating anti-hypopigmentation disorders.
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Affiliation(s)
- Jinpeng Lv
- College of Pharmaceutical Engineering and Life Sciences, Changzhou University, Changzhou 213000, China; Shanghai Institute of Pharmaceutical Industry, Shanghai 200000, China; Yabang Medical Research Institute, Changzhou 213000, China.
| | - Ying Fu
- College of Pharmaceutical Engineering and Life Sciences, Changzhou University, Changzhou 213000, China
| | - Rongyin Gao
- Department of Pharmacy, The first people's Hospital of Changzhou, The third Affiliated Hospital of Soochow University, Changzhou 213000, China
| | - Jiawen Li
- College of Pharmaceutical Engineering and Life Sciences, Changzhou University, Changzhou 213000, China
| | - Maofan Kang
- College of Pharmaceutical Engineering and Life Sciences, Changzhou University, Changzhou 213000, China
| | - Guoqiang Song
- College of Pharmaceutical Engineering and Life Sciences, Changzhou University, Changzhou 213000, China
| | - Changjun Yun
- Changzhou Wujin People's Hospital, Changzhou 213000, China
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23
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Cordella M, Tabolacci C, Senatore C, Rossi S, Mueller S, Lintas C, Eramo A, D'Arcangelo D, Valitutti S, Facchiano A, Facchiano F. Theophylline induces differentiation and modulates cytoskeleton dynamics and cytokines secretion in human melanoma-initiating cells. Life Sci 2019; 230:121-131. [PMID: 31125565 DOI: 10.1016/j.lfs.2019.05.050] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2019] [Revised: 05/17/2019] [Accepted: 05/20/2019] [Indexed: 12/22/2022]
Abstract
AIMS Cutaneous melanoma is the most aggressive skin cancer, derived from neoplastic transformation of melanocytes. Since several evidences highlighted the importance of a hierarchical model of differentiation among cancer cells, closely related to resistance mechanisms and tumor relapse, we investigated the effects of theophylline (Theo), a methylxanthine commonly used in treatment of respiratory diseases, on melanoma cells with different degree of differentiation, including patient-derived melanoma-initiating cells. MATERIALS AND METHODS The antiproliferative and antimetastatic effects of Theo was demonstrated by cell counting, adhesion and migration assays on A375 and SK-MEL-30 cells. Further, Theo ability to reduce cell growth was highly significant in A375-derived spheroids and in two patient-derived melanoma-initiating cells (MICs). In order to identify pathways potentially involved in the antineoplastic properties of Theo, a comparative mass spectrometry proteomic analysis was used. Then, melanin content, tyrosinase and tissue transglutaminase activities as differentiation markers and actin re-organization through confocal microscopy were evaluated. Furthermore, a secretome profile of MICs after Theo treatments was performed by multiplex immunoassay. KEY FINDINGS Obtained results demonstrate inhibitory effects of Theo on melanoma cell proliferation and migration, mainly in MICs, together with the induction of differentiation parameters. Moreover, our data indicate that the known anti-melanoma effect of Theo is due also to its ability to interfere with cytoskeleton dynamics and to induce the secretion of inflammatory molecules involved in recruitment of immunosuppressive cells in tumor microenvironment. SIGNIFICANCE Data strongly suggest that Theo supplement, either as drug or as dietary supply, may represent a potent additional weapon against melanoma.
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Affiliation(s)
- Martina Cordella
- Department of Oncology and Molecular Medicine, Istituto Superiore di Sanità, Rome, Italy
| | - Claudio Tabolacci
- Department of Oncology and Molecular Medicine, Istituto Superiore di Sanità, Rome, Italy.
| | - Cinzia Senatore
- Department of Oncology and Molecular Medicine, Istituto Superiore di Sanità, Rome, Italy
| | - Stefania Rossi
- Department of Oncology and Molecular Medicine, Istituto Superiore di Sanità, Rome, Italy
| | | | - Carla Lintas
- Center for Neurodevelopmental Disorders, Laboratory of Molecular Psychiatry and Neurogenetics, Department of Medicine, University Campus Bio-Medico, Rome, Italy
| | - Adriana Eramo
- Department of Oncology and Molecular Medicine, Istituto Superiore di Sanità, Rome, Italy
| | | | - Salvatore Valitutti
- Cancer Research Center of Toulouse, Toulouse, France; Department of Pathology, Institut Universitaire du Cancer-Oncopole de Toulouse, Toulouse, France
| | | | - Francesco Facchiano
- Department of Oncology and Molecular Medicine, Istituto Superiore di Sanità, Rome, Italy
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24
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Crawford M, Leclerc V, Barr K, Dagnino L. Essential Role for Integrin-Linked Kinase in Melanoblast Colonization of the Skin. J Invest Dermatol 2019; 140:425-434.e10. [PMID: 31330146 DOI: 10.1016/j.jid.2019.07.681] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2019] [Revised: 06/21/2019] [Accepted: 07/02/2019] [Indexed: 01/16/2023]
Abstract
Melanocytes are pigment-producing cells found in the skin and other tissues. Alterations in the melanocyte lineage give rise to a plethora of human diseases, from neurocristopathies and pigmentation disorders to melanoma. During embryogenesis, neural crest cell subsets give rise to two waves of melanoblasts, which migrate dorsolaterally, hone to the skin, and differentiate into melanocytes. However, the mechanisms that govern colonization of the skin by the first wave of melanoblasts are poorly understood. Here we report that targeted inactivation of the integrin-linked kinase gene in first wave melanoblasts causes defects in the ability of these cells to form long pseudopods, to migrate, and to proliferate in vivo. As a result, integrin-linked kinase-deficient melanoblasts fail to populate normally the developing epidermis and hair follicles. We also show that defects in motility and dendricity occur upon integrin-linked kinase gene inactivation in mature melanocytes, causing abnormalities in cell responses to the extracellular matrix substrates collagen I and laminin 332. Significantly, the ability to form long protrusions in mutant cells in response to collagen is restored in the presence of constitutively active Rac1, suggesting that an integrin-linked kinase-Rac1 nexus is likely implicated in melanocytic cell establishment, dendricity, and functions in the skin.
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Affiliation(s)
- Melissa Crawford
- Department of Physiology and Pharmacology, Children's Health Research Institute, Lawson Health Research Institute, London, Ontario, Canada
| | - Valerie Leclerc
- Department of Physiology and Pharmacology, Children's Health Research Institute, Lawson Health Research Institute, London, Ontario, Canada
| | - Kevin Barr
- Department of Physiology and Pharmacology, Children's Health Research Institute, Lawson Health Research Institute, London, Ontario, Canada
| | - Lina Dagnino
- Department of Physiology and Pharmacology, Children's Health Research Institute, Lawson Health Research Institute, London, Ontario, Canada; Department of Oncology, University of Western Ontario, London, Ontario, Canada.
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25
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Lee CS, Nam G, Bae IH, Park J. Whitening efficacy of ginsenoside F1 through inhibition of melanin transfer in cocultured human melanocytes-keratinocytes and three-dimensional human skin equivalent. J Ginseng Res 2018; 43:300-304. [PMID: 30962737 PMCID: PMC6437421 DOI: 10.1016/j.jgr.2017.12.005] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2017] [Revised: 12/18/2017] [Accepted: 12/27/2017] [Indexed: 12/21/2022] Open
Affiliation(s)
- Chang-Seok Lee
- Amorepacific CO R&D Center, Yongin-si, Republic of Korea.,Department of Beauty and Cosmetic Science, College of Health Science, Eulji University, Seongnam-si, Republic of Korea
| | - Gibaeg Nam
- Amorepacific CO R&D Center, Yongin-si, Republic of Korea
| | - Il-Hong Bae
- Amorepacific CO R&D Center, Yongin-si, Republic of Korea
| | - Junseong Park
- Amorepacific CO R&D Center, Yongin-si, Republic of Korea.,Department of Engineering Chemistry, Chungbuk National University, Cheongju-si, Chungbuk, Republic of Korea
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26
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Dalmau N, Andrieu-Abadie N, Tauler R, Bedia C. Untargeted lipidomic analysis of primary human epidermal melanocytes acutely and chronically exposed to UV radiation. Mol Omics 2018; 14:170-180. [DOI: 10.1039/c8mo00060c] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Ultraviolet (UV) radiation present in sunlight has been related to harmful effects on skin such as premature aging and skin cancer.
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Affiliation(s)
- Núria Dalmau
- Department of Environmental Chemistry
- Institute of Environmental Assessment and Water Research (IDAEA-CSIC)
- 08034 Barcelona
- Spain
| | | | - Romà Tauler
- Department of Environmental Chemistry
- Institute of Environmental Assessment and Water Research (IDAEA-CSIC)
- 08034 Barcelona
- Spain
| | - Carmen Bedia
- Department of Environmental Chemistry
- Institute of Environmental Assessment and Water Research (IDAEA-CSIC)
- 08034 Barcelona
- Spain
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27
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Wan J, Lin F, Zhang W, Xu A, DeGiorgis J, Lu H, Wan Y. Novel approaches to vitiligo treatment via modulation of mTOR and NF-κB pathways in human skin melanocytes. Int J Biol Sci 2017; 13:391-400. [PMID: 28367103 PMCID: PMC5370446 DOI: 10.7150/ijbs.17318] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2016] [Accepted: 01/09/2017] [Indexed: 01/18/2023] Open
Abstract
Vitiligo is a skin depigmentation disorder with an increasing prevalence. Among recognized mechanisms is the oxidative stress that affects melanocytes which are responsible for skin pigmentation. Studies have shown that high concentration of hydrogen peroxide, or H2O2, induces apoptotic activities. Few studies have been done with lower doses of H2O2. Using human skin melanocytes, we investigated the effect of moderate concentration of H2O2 on melanocyte dendrites. Confocal data show that H2O2 at 250 µM induces loss of dendrites, as indicated by cytoskeletal proteins. α-melanocyte stimulating hormone or α-MSH pretreatment protects against H2O2-induced loss of dendrites, while α-MSH alone enhances dendrites. PI3K/AKT inhibitor LY294002 and mTORC1 inhibitor Rapamycin inhibit α-MSH-induced dendrites. In this study, we also investigated the effect of TNFα on cultured human skin melanocytes, since TNFα plays important roles in vitiligo. Confocal data demonstrate that TNFα induces NFκB activation. Western blot analysis shows that TNFα induces IκB phosphorylation and degradation. Interestingly, α-MSH does not have any effect of TNFα-induced IκB degradation and NF-κB activation. α-MSH, however, activates mTORC1 pathway. TNFα induces p38 but not AMPKα activation. Collectively, our data suggest that modulation of mTOR and NF-κB pathways may be a novel approach for better clinical management of vitiligo.
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Affiliation(s)
- Jerry Wan
- Department of Biology, Providence College, Providence, RI 02918, USA
| | - Fuquan Lin
- Department of Dermatology, the 3 rd Hospital of Hangzhou, Hangzhou 310000, Zhejiang Province, China
| | - Wei Zhang
- Department of Dermatology, Guiyang Medical University, Guizhou 550004, China
| | - Aie Xu
- Department of Dermatology, the 3 rd Hospital of Hangzhou, Hangzhou 310000, Zhejiang Province, China
| | - Joseph DeGiorgis
- Department of Biology, Providence College, Providence, RI 02918, USA
| | - Hongguang Lu
- Department of Dermatology, Guiyang Medical University, Guizhou 550004, China
| | - Yinsheng Wan
- Department of Biology, Providence College, Providence, RI 02918, USA
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28
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The effect of the NMDA receptor-dependent signaling pathway on cell morphology and melanosome transfer in melanocytes. J Dermatol Sci 2016; 84:296-304. [PMID: 27596138 DOI: 10.1016/j.jdermsci.2016.08.534] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2016] [Revised: 06/03/2016] [Accepted: 08/24/2016] [Indexed: 12/26/2022]
Abstract
BACKGROUND The pigmentation of skin and hair in mammals is driven by the intercellular transfer of melanosome from the melanocyte to surrounding keratinocytes However, the detailed molecular mechanism is still a subject of investigation. OBJECTIVE To investigate the effects of N-methyl-d-aspartate (NMDA) receptor-dependent signaling pathway on melanocyte morphologic change and melanosome transfer between melanocytes and keratinocytes. METHODS The expression and the intracellular distribution of NMDA receptor in human melanocyte were analyzed by Western blot and immunofluorescence staining. Melanocytes were treated with 100μM NMDA receptor antagonist MK-801 [(+)-5-methyl-10,11-dihydro-5H-dibenzo[a,d] cyclohepten-5,10-imine maleate] and 100μM NMDA receptor agonist NMDA, after which the morphological change of melanocyte dendrites and filopodias were observed by scanning electron microscope. The β-tubulin distribution and intracellular calcium concentration ([Ca2+]i) were observed by immunofluorescence staining and flow cytometry under the same treatment respectively. In addition, melanocytes and keratinocytes were co-cultured with or without treatment of MK-801, and the melanosome transfer efficacy were analyzed by flow cytometry. RESULTS We show that human epidermal melanocytes expresses NMDA receptor 1, one subtype of the ionotropic glutamate receptors (iGluRs). Stimulation with agonist of NMDA receptor increased the number of melanocyte filopodia. In contrast, blockage of NMDA receptor with antagonist decreased the number of melanocyte filopodia and this morphological change was accompanied by the disorganization of β-tubulin microfilaments in the intracellular cytoskeleton. In melanocyte-keratinocyte co-cultures, numerous melanocyte filopodia connect to keratinocyte plasma membranes; agonist of NMDA receptor exhibited an increased number of melanocyte filopodia attachments to keratinocyte, while antagonist of NMDA receptor led to a decreased. Moreover, antagonist of NMDA receptor decreased the intracellular calcium concentration in melanocytes and reduced the efficacy of melanosome transfer. CONCLUSION Our data suggest that filopodia delivery is the major mode of melanosome transfer between melanocytes and keratinocytes. NMDA drives melanosome transfer by promoting filopodia delivery and direct morphological effects on melanocytes, while MK-801 affects the intracellular β-tubulin redistribution and the filopodia delivery between melanocytes and keratinocytes. We hypothesize that NMDA receptor-dependent signaling is involved in melanosome transfer, which is associated with calcium influx, cytoskeleton protein redistribution, dendrites and filopodia formation. A thorough understanding of melanosome transfer is crucial for designing treatments for hyper- and hypo-pigmentary disorders of the skin.
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29
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Weng WH, Liao YH, Tsai MR, Wei ML, Huang HY, Sun CK. Differentiating intratumoral melanocytes from Langerhans cells in nonmelanocytic pigmented skin tumors in vivo by label-free third-harmonic generation microscopy. JOURNAL OF BIOMEDICAL OPTICS 2016; 21:76009. [PMID: 27424606 DOI: 10.1117/1.jbo.21.7.076009] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/21/2015] [Accepted: 06/20/2016] [Indexed: 05/08/2023]
Abstract
Morphology and distribution of melanocytes are critical imaging information for the diagnosis of melanocytic lesions. However, how to image intratumoral melanocytes noninvasively in pigmented skin tumors is seldom investigated. Third-harmonic generation (THG) is shown to be enhanced by melanin, whereas high accuracy has been demonstrated using THG microscopy for in vivo differential diagnosis of nonmelanocytic pigmented skin tumors. It is thus desirable to investigate if label-free THG microscopy was capable to in vivo identify intratumoral melanocytes. In this study, histopathological correlations of label-free THG images with the immunohistochemical images stained with human melanoma black (HMB)-45 and cluster of differentiation 1a (CD1a) were made. The correlation results indicated that the intratumoral THG-bright dendritic-cell-like signals were endogenously derived from melanocytes rather than Langerhans cells (LCs). The consistency between THG-bright dendritic-cell-like signals and HMB-45 melanocyte staining showed a kappa coefficient of 0.807, 84.6% sensitivity, and 95% specificity. In contrast, a kappa coefficient of −0.37, 21.7% sensitivity, and 30% specificity were noted between the THG-bright dendritic-cell-like signals and CD1a staining for LCs. Our study indicates the capability of noninvasive label-free THG microscopy to differentiate intratumoral melanocytes from LCs, which is not feasible in previous in vivo label-free clinical-imaging modalities.
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Affiliation(s)
- Wei-Hung Weng
- National Taiwan University, Molecular Imaging Center, No. 1, Section 4, Roosevelt Road, Da'an District, Taipei 10617, TaiwanbHarvard Medical School, Department of Biomedical Informatics, 10 Shattuck Street, Boston, Massachusetts 02115, United States
| | - Yi-Hua Liao
- National Taiwan University, Molecular Imaging Center, No. 1, Section 4, Roosevelt Road, Da'an District, Taipei 10617, TaiwancNational Taiwan University Hospital and National Taiwan University College of Medicine, Department of Dermatology, No. 7, Zhongsha
| | - Ming-Rung Tsai
- National Taiwan University, Molecular Imaging Center, No. 1, Section 4, Roosevelt Road, Da'an District, Taipei 10617, Taiwan
| | - Ming-Liang Wei
- National Taiwan University, Molecular Imaging Center, No. 1, Section 4, Roosevelt Road, Da'an District, Taipei 10617, Taiwan
| | - Hsin-Yi Huang
- National Taiwan University Hospital and National Taiwan University College of Medicine, Department of Pathology, No. 7, Zhongshan S Road, Zhongzheng District, Taipei 100, Taiwan
| | - Chi-Kuang Sun
- National Taiwan University, Molecular Imaging Center, No. 1, Section 4, Roosevelt Road, Da'an District, Taipei 10617, TaiwaneNational Taiwan University, Department of Electrical Engineering and Graduate Institute of Photonics and Optoelectronics, No. 1, S
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30
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Robles FE, Deb S, Wilson JW, Gainey CS, Selim MA, Mosca PJ, Tyler DS, Fischer MC, Warren WS. Pump-probe imaging of pigmented cutaneous melanoma primary lesions gives insight into metastatic potential. BIOMEDICAL OPTICS EXPRESS 2015; 6:3631-45. [PMID: 26417529 PMCID: PMC4574685 DOI: 10.1364/boe.6.003631] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/24/2015] [Revised: 08/19/2015] [Accepted: 08/22/2015] [Indexed: 05/20/2023]
Abstract
Metastatic melanoma is associated with a poor prognosis, but no method reliably predicts which melanomas of a given stage will ultimately metastasize and which will not. While sentinel lymph node biopsy (SLNB) has emerged as the most powerful predictor of metastatic disease, the majority of people dying from metastatic melanoma still have a negative SLNB. Here we analyze pump-probe microscopy images of thin biopsy slides of primary melanomas to assess their metastatic potential. Pump-probe microscopy reveals detailed chemical information of melanin with subcellular spatial resolution. Quantification of the molecular signatures without reference standards is achieved using a geometrical representation of principal component analysis. Melanin structure is analyzed in unison with the chemical information by applying principles of mathematical morphology. Results show that melanin in metastatic primary lesions has lower chemical diversity than non-metastatic primary lesions, and contains two distinct phenotypes that are indicative of aggressive disease. Further, the mathematical morphology analysis reveals melanin in metastatic primary lesions has a distinct "dusty" quality. Finally, a statistical analysis shows that the combination of the chemical information with spatial structures predicts metastatic potential with much better sensitivity than SLNB and high specificity, suggesting pump-probe microscopy can be an important tool to help predict the metastatic potential of melanomas.
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Affiliation(s)
| | - Sanghamitra Deb
- Department of Chemistry, Duke University, Durham, North Carolina 27708, USA
| | - Jesse W. Wilson
- Department of Chemistry, Duke University, Durham, North Carolina 27708, USA
| | | | - M. Angelica Selim
- Department of Pathology, Duke University Medical Center, Durham, NC 27705, USA
| | - Paul J. Mosca
- Department of Surgery, Duke University Medical Center, Durham, NC 27705, USA
| | - Douglas S. Tyler
- Department of Surgery, University of Texas Medical Branch, Galveston, TX 77555, USA
| | - Martin C. Fischer
- Department of Chemistry, Duke University, Durham, North Carolina 27708, USA
| | - Warren S. Warren
- Department of Chemistry, Duke University, Durham, North Carolina 27708, USA
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31
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Murai H, Tadokoro R, Sakai KI, Takahashi Y. In ovo gene manipulation of melanocytes and their adjacent keratinocytes during skin pigmentation of chicken embryos. Dev Growth Differ 2015; 57:232-41. [PMID: 25739909 DOI: 10.1111/dgd.12201] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2014] [Revised: 01/08/2015] [Accepted: 01/23/2015] [Indexed: 01/27/2023]
Abstract
During skin pigmentation in avians and mammalians, melanin is synthesized in the melanocytes, and subsequently transferred to adjacently located keratinocytes, leading to a wide coverage of the body surface by melanin-containing cells. The behavior of melanocytes is influenced by keratinocytes shown mostly by in vitro studies. However, it has poorly been investigated how such intercellular cross-talk is regulated in vivo because of a lack of suitable experimental models. Using chicken embryos, we developed a method that enables in vivo gene manipulations of melanocytes and keratinocytes, where these cells are separately labeled by different genes. Two types of gene transfer techniques were combined: one was a retrovirus-mediated gene infection into the skin/keratinocytes, and the other was the in ovo DNA electroporation into neural crest cells, the origin of melanocytes. Since the Replication-Competent Avian sarcoma-leukosis virus long terminal repeat with Splice acceptor (RCAS) infection was available only for the White leghorn strain showing little pigmentation, melanocytes prepared from the Hypeco nera (pigmented) were back-transplanted into embryos of White leghorn. Prior to the transplantation, enhanced green fluorescent protein (EGFP)(+) Neo(r+) -electroporated melanocytes from Hypeco nera were selectively grown in G418-supplemented medium. In the skin of recipient White leghorn embryos infected with RCAS-mOrange, mOrange(+) keratinocytes and transplanted EGFP(+) melanocytes were frequently juxtaposed each other. High-resolution confocal microscopy also revealed that transplanted melanocytes exhibited normal behaviors regarding distribution patterns of melanocytes, dendrite morphology, and melanosome transfer. The method described in this study will serve as a useful tool to understand the mechanisms underlying intercellular regulations during skin pigmentation in vivo.
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Affiliation(s)
- Hidetaka Murai
- Department of Zoology, Graduate School of Science, Kyoto University, Kitashirakawa, Sakyo-ku, Kyoto, 606-8502, Japan; Graduate School of Biological Sciences, Nara Institute of Science and Technology, NARA, Takayama, Ikoma, 630-0192, Japan
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32
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MicroRNA 340 is involved in UVB-induced dendrite formation through the regulation of RhoA expression in melanocytes. Mol Cell Biol 2014; 34:3407-20. [PMID: 24980435 DOI: 10.1128/mcb.00106-14] [Citation(s) in RCA: 43] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
The influence of UV irradiation on pigmentation is well established, but the molecular and cellular mechanisms controlling dendrite formation remain incompletely understood. MicroRNAs (miRNAs) are a class of small RNAs that participate in various cellular processes by suppressing the expression of target mRNAs. In this study, we investigated the expression of miRNAs in response to UVB irradiation using a microarray screen and then identified potential mRNA targets for differentially expressed miRNAs among the genes governing dendrite formation. We subsequently determined the ability of miRNA 340 (miR-340) to suppress the expression of RhoA, which is a predicted miR-340 target gene that regulates dendrite formation. The overexpression of miR-340 promoted dendrite formation and melanosome transport, and the downregulation of miR-340 inhibited UVB-induced dendrite formation and melanosome transport. Moreover, a luciferase reporter assay demonstrated direct targeting of RhoA by miR-340 in the immortalized human melanocyte cell line Pig1. In conclusion, this study has established an miRNA associated with UVB irradiation. The significant downregulation of RhoA protein and mRNA expression after UVB irradiation and the modulation of miR-340 expression suggest a key role for miR-340 in regulating UVB-induced dendrite formation and melanosome transport.
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De Filippis B, Romano E, Laviola G. Aberrant Rho GTPases signaling and cognitive dysfunction: in vivo evidence for a compelling molecular relationship. Neurosci Biobehav Rev 2014; 46 Pt 2:285-301. [PMID: 24971827 DOI: 10.1016/j.neubiorev.2014.06.007] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/26/2013] [Revised: 05/30/2014] [Accepted: 06/17/2014] [Indexed: 01/11/2023]
Abstract
Rho GTPases are key intracellular signaling molecules that coordinate dynamic changes in the actin cytoskeleton, thereby stimulating a variety of processes, including morphogenesis, migration, neuronal development, cell division and adhesion. Deviations from normal Rho GTPases activation state have been proposed to disrupt cognition and synaptic plasticity. This review focuses on the functional consequences of genetic ablation of upstream and downstream Rho GTPases molecules on cognitive function and neuronal morphology and connectivity. Available information on this issue is described and compared to that gained from mice carrying mutations in the most studied Rho GTPases and from pharmacological in vivo studies in which brain Rho GTPases signaling was modulated. Results from reviewed literature provide definitive evidence of a compelling link between Rho GTPases signaling and cognitive function, thus supporting the notion that Rho GTPases and their downstream effectors may represent important therapeutic targets for disorders associated with cognitive dysfunction.
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Affiliation(s)
- Bianca De Filippis
- Sect. Behavioural Neuroscience, Department of Cell Biology & Neuroscience, Istituto Superiore di Sanità, Roma, Italy.
| | - Emilia Romano
- Sect. Behavioural Neuroscience, Department of Cell Biology & Neuroscience, Istituto Superiore di Sanità, Roma, Italy; Bambino Gesù, Children Hospital, IRCCS, Roma, Italy
| | - Giovanni Laviola
- Sect. Behavioural Neuroscience, Department of Cell Biology & Neuroscience, Istituto Superiore di Sanità, Roma, Italy
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Kluth S, Distl O. Congenital sensorineural deafness in dalmatian dogs associated with quantitative trait loci. PLoS One 2013; 8:e80642. [PMID: 24324618 PMCID: PMC3851758 DOI: 10.1371/journal.pone.0080642] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2012] [Accepted: 10/14/2013] [Indexed: 12/13/2022] Open
Abstract
A genome-wide association study (GWAS) was performed for 235 Dalmatian dogs using the canine Illumina high density bead chip to identify quantitative trait loci (QTL) associated with canine congenital sensorineural deafness (CCSD). Data analysis was performed for all Dalmatian dogs and in addition, separately for brown-eyed and blue-eyed dogs because of the significant influence of eye colour on CCSD in Dalmatian dogs. Mixed linear model analysis (MLM) revealed seven QTL with experiment-wide significant associations (-log10P>5.0) for CCSD in all Dalmatian dogs. Six QTL with experiment-wide significant associations for CCSD were found in brown-eyed Dalmatian dogs and in blue-eyed Dalmatian dogs, four experiment-wide significant QTL were detected. The experiment-wide CCSD-associated SNPs explained 82% of the phenotypic variance of CCSD. Five CCSD-loci on dog chromosomes (CFA) 6, 14, 27, 29 and 31 were in close vicinity of genes shown as causative for hearing loss in human and/or mouse.
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Affiliation(s)
- Susanne Kluth
- Institute for Animal Breeding and Genetics, University of Veterinary Medicine Hannover, Hannover, Germany
| | - Ottmar Distl
- Institute for Animal Breeding and Genetics, University of Veterinary Medicine Hannover, Hannover, Germany
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Shin DH, Cha YJ, Joe GJ, Yang KE, Jang IS, Kim BH, Kim JM. Whitening effect of Sophora flavescens extract. PHARMACEUTICAL BIOLOGY 2013; 51:1467-1476. [PMID: 24106757 DOI: 10.3109/13880209.2013.799708] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
CONTEXT Sophora flavescens Ait. (Leguminosae) has been proposed as a new whitening agent for cosmetics, because it has a strong ability to inhibit tyrosinase, a key enzyme in the formation of melanin. OBJECTIVE We conducted a study to determine whether ethanol extract of the roots of S. flavescens has the potential for use as a whitening cosmetic agent by investigating its underlying mechanisms of action. MATERIALS AND METHODS To elucidate the mechanism of action of S. flavescens extract, we used DNA microarray technology. We investigated the changes in the mRNA levels of genes associated with the formation and transport of melanosomes. We also identified the formation and transport of melanosomes with immunohistochemistry and immunofluorescence analyses. Finally, the skin-whitening effect in vivo of S. flavescens extract was analyzed on human skin. RESULTS We found that S. flavescens extract strongly inhibited tyrosinase activity (IC50, 10.4 μg/mL). Results also showed that key proteins involved in the formation and transport of melanosomes were dramatically downregulated at both mRNA and protein level in keratinocytes exposed to S. flavescens extract. In addition, a clinical trial of a cream containing 0.05% S. flavescens extract on human skin showed it had a significant effect on skin whitening by mechanical and visual evaluation (1.14-fold). DISCUSSION AND CONCLUSION This study provides important clues toward understanding the effects of S. flavescens extract on the formation and transport of melanosomes. From these results, we suggest that naturally occurring S. flavescens extract might be useful as a new whitening agent in cosmetics.
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Affiliation(s)
- Dae Hyun Shin
- R&D Center, Somang Cosmetics Corporation , Namdong-gu, Incheon , Republic of Korea
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Yoo JC, Lim TY, Park JS, Hah YS, Park N, Hong SG, Park JY, Yoon TJ. SYT14L, especially its C2 domain, is involved in regulating melanocyte differentiation. J Dermatol Sci 2013; 72:246-51. [PMID: 23999003 DOI: 10.1016/j.jdermsci.2013.07.010] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2013] [Revised: 07/25/2013] [Accepted: 07/25/2013] [Indexed: 11/26/2022]
Abstract
BACKGROUND The formation of dendrites by melanocytes is highly analogous to that process in neural cells. We previously reported that a C2 domain-containing protein, copine-1, is involved in the extension of dendrites by neural cells. However, the effect of C2 domain-containing proteins in dendrite formation by melanocytes has not yet been elucidated. OBJECTIVE The aim of this study was to screen novel C2 domain-containing proteins related to dendrite outgrowth in melanocytes and to investigate their precise roles in melanocyte dendrite formation during differentiation. METHODS We transduced mouse melan-a melanocytes with a recombinant adenovirus expressing a C2 domain library. Dendrite elongation, melanin content, tyrosinase activity and Western blot analyses were conducted to elucidate the possible underlying mechanisms of action in melanocytes. RESULTS Sixteen sets of C2 domain-containing proteins were identified whose over-expression resulted in dendrite lengthening. Among those, we focused on the C2 domain of SYT14L (truncated mutant of SYT14L) in this study. Forced expression of full length SYT14L or the C2 domain of SYT14L induced a significant elongation of dendrite length accompanied by the induction of melanocyte differentiation-related markers, including melanin synthesis, tyrosinase catalytic activity and the expression of tyrosinase (TYR), tyrosinase related protein-1 (TRP-1) and TRP-2. In addition, over-expression of either the C2 domain or the full length form of SYT14L significantly increased the phosphorylation of ERK and CREB. CONCLUSION These results suggest that SYT14L, especially its C2 domain, may play an important role in regulating melanocyte differentiation through the modulation of ERK and (or) CREB signaling.
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Affiliation(s)
- Jae Cheal Yoo
- Department of Physiology, Institute of Health Sciences and Medical Research Center for Neural Dysfunction, School of Medicine, Gyeongsang National University, Jinju 660-751, Republic of Korea
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Wang WQ, Wu JF, Xiao XQ, Xiao Q, Wang J, Zuo FG. Narrow-band UVB radiation promotes dendrite formation by activating Rac1 in B16 melanoma cells. Mol Clin Oncol 2013; 1:858-862. [PMID: 24649261 PMCID: PMC3916207 DOI: 10.3892/mco.2013.145] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2013] [Accepted: 06/27/2013] [Indexed: 11/08/2022] Open
Abstract
Melanocytes are found scattered throughout the basal layer of the epidermis. Following hormone or ultraviolet (UV) light stimulation, the melanin pigments contained in melanocytes are transferred through the dendrites to the surrounding keratinocytes to protect against UV light damage or carcinogenesis. This has been considered as a morphological indicator of melanocytes and melanoma cells. Small GTPases of the Rho family have been implicated in the regulation of actin reorganization underlying dendrite formation in melanocytes and melanoma cells. It has been proven that ultraviolet light plays a pivotal role in melanocyte dendrite formation; however, the molecular mechanism underlying this process has not been fully elucidated. The effect of small GTPases, such as Rac1 and RhoA, on the morphology of B16 melanoma cells treated with narrow-band UVB radiation was investigated. The morphological changes were observed under a phase contrast microscope and the F-actin microfilament of the cytoskeleton was observed under a laser scanning confocal microscope. The pull-down assay was performed to detect the activity of the small GTPases Rac1 and RhoA. The morphological changes were evident, with globular cell bodies and increased numbers of tree branch-like dendrites. The cytoskeletal F-actin appeared disassembled following narrow-band UVB irradiation of B16 melanoma cells. Treatment of B16 melanoma cells with narrow-band UVB radiation resulted in the activation of Rac1 in a time-dependent manner. In conclusion, the present study may provide a novel method through which narrow-band UVB radiation may be used to promote dendrite formation by activating the Rac1 signaling pathway, resulting in F-actin rearrangement in B16 melanoma cells.
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Affiliation(s)
- Wu-Qing Wang
- Department of Dermatology, The Central Hospital of Minhang, Shanghai 201199, P.R. China
| | - Jin-Feng Wu
- Department of Dermatology, Huashan Hospital, Fudan University, Shanghai 200040, P.R. China
| | - Xiao-Qing Xiao
- Department of Dermatology, East Hospital, School of Medicine, Tongji University, Shanghai 200120, P.R. China
| | - Qin Xiao
- Department of Dermatology, East Hospital, School of Medicine, Tongji University, Shanghai 200120, P.R. China
| | - Jing Wang
- Department of Dermatology, East Hospital, School of Medicine, Tongji University, Shanghai 200120, P.R. China
| | - Fu-Guo Zuo
- Department of Dermatology, East Hospital, School of Medicine, Tongji University, Shanghai 200120, P.R. China
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Chen Y, Soong J, Mohanty S, Xu L, Scott G. The neural guidance receptor Plexin C1 delays melanoma progression. Oncogene 2012; 32:4941-9. [PMID: 23160370 DOI: 10.1038/onc.2012.511] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/11/2012] [Revised: 09/18/2012] [Accepted: 09/21/2012] [Indexed: 01/13/2023]
Abstract
Plexin C1 is a type I transmembrane receptor with intrinsic R-Ras GTPase activity, which regulates cytoskeletal remodeling and adhesion in normal human melanocytes. Melanocytes are pigment-producing cells of the epidermis, precursors for melanoma, and express high levels of Plexin C1, which is lost in melanoma in vitro and in vivo. To determine if Plexin C1 is a tumor suppressor for melanoma, we introduced Plexin C1 into a primary human melanoma cell line, and phenotypes including migration, apoptosis, proliferation and tumor growth in mice were analyzed. Complimentary studies in which Plexin C1 was silenced in human melanocytes were performed. Plexin C1 significantly inhibited migration and proliferation in melanoma, whereas in melanocytes, loss of Plexin C1 increased migration and proliferation. In mouse xenografts, Plexin C1 delayed tumor growth of melanoma at early time points, but tumors eventually escaped the suppressive effects of Plexin C1, due to Plexin C1-dependent activation of the pro-survival protein Akt. R-Ras activation stimulates melanoma migration. Plexin C1 lowered R-Ras activity in melanoma and melanocytes, consistent with inhibitory effects of Plexin C1 on migration of melanocytes and melanoma. To determine if R-Ras is expressed in melanocytic lesions in vivo, staining of tissue microarrays of nevi and melanoma were performed. R-Ras expression was highly limited in melanocytic lesions, being essentially confined to primary melanoma, and almost completely absent in nevi and metastatic melanoma. These data suggest that loss of Plexin C1 in melanoma may promote early steps in melanoma progression through suppression of migration and proliferation, but pro-survival effects of Plexin C1 ultimately abrogate the tumor suppressive effects of Plexin C1. In primary melanoma, loss of Plexin C1 may function in early steps of melanoma progression by releasing inhibition of R-Ras activation, and stimulating migration.
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Affiliation(s)
- Y Chen
- Department of Dermatology, University of Rochester School of Medicine, Rochester, NY, USA
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Villareal MO, Han J, Ikuta K, Isoda H. Mechanism of Mitf inhibition and morphological differentiation effects of hirsein A on B16 melanoma cells revealed by DNA microarray. J Dermatol Sci 2012; 67:26-36. [PMID: 22564683 DOI: 10.1016/j.jdermsci.2012.04.005] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2011] [Revised: 03/31/2012] [Accepted: 04/09/2012] [Indexed: 12/18/2022]
Abstract
BACKGROUND We have previously reported that hirsein A inhibits melanogenesis in B16 melanoma cells by downregulating the Mitf gene expression. OBJECTIVE In this study, microarray was employed to determine the transcriptional response of B16 cells to hirsein A (HA) treatment and to find out the mechanism underlying Mitf downregulation. METHODS DNA microarray, spotted with 265 genes for melanogenesis and signal transduction, was performed using the total RNA isolated from B16 cells treated with HA. Validation of the results was done using real-time PCR. In addition, real-time PCR using primers for Mda-7 gene and F-actin staining were performed. Transfection experiments were performed to knockdown the expression of the Mc1r gene to evaluate its role in the cell morphological change observed. RESULTS As expected, the expressions of the Mitf-regulated melanosome transport genes and the Mc1r gene were downregulated. Furthermore, the expressions of the MAPK pathway intermediates were either up- or downregulated. Genes associated with cell differentiation, such as Gadd45b, were upregulated and prompted us to determine the expression of the Il-24 (Mda-7) gene using real-time PCR. There was an increase in the Mda-7 mRNA expression in B16 and HMV-II melanoma cells, and in human melanocytes. To better visualize the cell morphology, F-actin staining was performed and the results showed an increase in the dendrite outgrowth in HA-treated cells. Silencing the Mc1r gene did not cause a change in the B16 cell morphology observed in cells treated with HA. CONCLUSION This study demonstrated that HA downregulates Mitf gene expression by regulating the expressions of the MAPK signaling pathway intermediates. In addition, the inhibited Mc1r gene expression also contributed to the overall Mitf downregulation but does not play a role in the observed change in B16 cell morphology. HA surprisingly can regulate genes associated with differentiating cells (Mda-7) suggesting a role for HA in the melanoma cell differentiation induction. While the exact molecular mechanism by which HA promotes cell differentiation remain to be determined, it is clear that HA can downregulate Mitf expression and promote cell differentiation and has the potential to be used in the development of therapy for melanoma.
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Affiliation(s)
- Myra O Villareal
- Graduate School of Life and Environmental Sciences, University of Tsukuba, Tsukuba, Ibaraki, Japan
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Jung E, Hwang W, Kim S, Kim YS, Kim YS, Lee J, Park D. Depigmenting action of platycodin D depends on the cAMP/Rho-dependent signalling pathway. Exp Dermatol 2011; 20:986-91. [PMID: 21995379 DOI: 10.1111/j.1600-0625.2011.01379.x] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Abstract
The overproduction and accumulation of melanin in the skin could lead to a pigmentary disorders, such as melasma, freckle, postinflammatory melanoderma and solar lentigo. Therefore, this study was conducted to investigate the effects of platycodin D (PD) on melanogenesis and its action mechanisms. In this study, we found that PD significantly inhibited melanin synthesis at low concentrations. These effects were further demonstrated by the PD-induced inhibition of cAMP production, phosphorylation of the cAMP-response element-binding protein and expression of microphthalmia-associated transcription factor and its downstream genes, tyrosinase, tyrosinase-related proteins-1 and Dct/tyrosinase-related proteins-2, suggesting that PD inhibits melanogenesis through the downregulation of cAMP signalling. Furthermore, PD induced significant morphological changes in melanocytes, namely, the retraction of dendrites. A small GTPase assays revealed that PD stimulated an increase in GTP-bound Rho content, one of downstream molecules of cAMP, but not in Rac or CDC42 content. Moreover, a Rho inhibitor (C3 exoenzyme) and a Rho kinase inhibitor (Y27632) attenuated the dendrite retraction induced by PD. Taken together, these findings indicate that PD inhibits melanogenesis by inhibiting the cAMP-protein kinase A pathway and also suppresses melanocyte dendricity through activation of the Rho signal that is mediated by PD-induced reduction in cAMP production. Therefore, these results suggest that PD exerts its inhibitory effects on melanogenesis and melanocyte dendricity via suppression of cAMP signalling and may be introduced as an inhibitor of hyperpigmentation caused by UV irradiation or pigmented skin disorders.
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Affiliation(s)
- Eunsun Jung
- Biospectrum Life Science Institute, Seongnam City, Gyunggi Do, Korea Natural Products Research Institute, College of Pharmacy, Seoul National University, Seoul, Korea
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MKK6 increases the melanocyte dendricity through the regulation of Rho family GTPases. J Dermatol Sci 2010; 60:114-9. [DOI: 10.1016/j.jdermsci.2010.08.006] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2010] [Revised: 08/02/2010] [Accepted: 08/08/2010] [Indexed: 11/19/2022]
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Belleudi F, Purpura V, Scrofani C, Persechino F, Leone L, Torrisi MR. Expression and signaling of the tyrosine kinase FGFR2b/KGFR regulates phagocytosis and melanosome uptake in human keratinocytes. FASEB J 2010; 25:170-81. [PMID: 20844240 DOI: 10.1096/fj.10-162156] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
Membrane and actin cytoskeleton dynamics during phagocytosis can be triggered and amplified by the signal transduction of receptor tyrosine kinases. The epidermal keratinocytes appear to use the phagocytic mechanism of uptake to ingest melanosomes released by the melanocytes and play a pivotal role in the transfer process. We have previously demonstrated that the keratinocyte growth factor KGF/FGF7 promotes the melanosome uptake through activation of its receptor tyrosine kinase FGFR2b/KGFR. The aim of the present study was to investigate the contribution of KGFR expression, activation, and signaling in regulating the phagocytic process and the melanosome transfer. Phagocytosis was analyzed in vitro using fluorescent latex beads on human keratinocytes induced to differentiate. Melanosome transfer was investigated in keratinocyte-melanocyte cocultures. KGFR depletion by small interfering RNA microinjection and overexpression by transfection of wild type or defective mutant KGFR were performed to demonstrate the direct effect of the receptor on phagocytosis and melanosome transfer. Colocalization of the phagocytosed beads with the internalized receptors in phagolysosomes was analyzed by optical sectioning and 3-dimensional reconstruction. KGFR ligands triggered phagocytosis and melanosome transfer in differentiated keratinocytes, and receptor kinase activity and signaling were required for these effects, suggesting that FGFR2b/KGFR expression/activity and PLCγ signaling pathway play crucial roles in phagocytosis.
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Affiliation(s)
- Francesca Belleudi
- Istituto Pasteur-Fondazione Cenci Bolognetti, Dipartimento di Medicina Clinica e Molecolare, Sapienza Università di Roma, Rome, Italy
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Reed RA, Womble MA, Dush MK, Tull RR, Bloom SK, Morckel AR, Devlin EW, Nascone-Yoder NM. Morphogenesis of the primitive gut tube is generated by Rho/ROCK/myosin II-mediated endoderm rearrangements. Dev Dyn 2010; 238:3111-25. [PMID: 19924810 DOI: 10.1002/dvdy.22157] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022] Open
Abstract
During digestive organogenesis, the primitive gut tube (PGT) undergoes dramatic elongation and forms a lumen lined by a single-layer of epithelium. In Xenopus, endoderm cells in the core of the PGT rearrange during gut elongation, but the morphogenetic mechanisms controlling their reorganization are undetermined. Here, we define the dynamic changes in endoderm cell shape, polarity, and tissue architecture that underlie Xenopus gut morphogenesis. Gut endoderm cells intercalate radially, between their anterior and posterior neighbors, transforming the nearly solid endoderm core into a single layer of epithelium while concomitantly eliciting "radially convergent" extension within the gut walls. Inhibition of Rho/ROCK/Myosin II activity prevents endoderm rearrangements and consequently perturbs both gut elongation and digestive epithelial morphogenesis. Our results suggest that the cellular and molecular events driving tissue elongation in the PGT are mechanistically analogous to those that function during gastrulation, but occur within a novel cylindrical geometry to generate an epithelial-lined tube.
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Affiliation(s)
- Rachel A Reed
- Department of Molecular Biomedical Sciences, College of Veterinary Medicine, North Carolina State University, Raleigh, North Carolina 27606, USA
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Kim JH, Sohn KC, Choi TY, Kim MY, Ando H, Choi SJ, Kim S, Lee YH, Lee JH, Kim CD, Yoon TJ. β-Catenin regulates melanocyte dendricity through the modulation of PKCζ and PKCδ. Pigment Cell Melanoma Res 2010; 23:385-93. [DOI: 10.1111/j.1755-148x.2010.00695.x] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
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Blasius AL, Brandl K, Crozat K, Xia Y, Khovananth K, Krebs P, Smart NG, Zampolli A, Ruggeri ZM, Beutler BA. Mice with mutations of Dock7 have generalized hypopigmentation and white-spotting but show normal neurological function. Proc Natl Acad Sci U S A 2009; 106:2706-11. [PMID: 19202056 PMCID: PMC2650330 DOI: 10.1073/pnas.0813208106] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2008] [Indexed: 12/30/2022] Open
Abstract
The classical recessive coat color mutation misty (m) arose spontaneously on the DBA/J background and causes generalized hypopigmentation and localized white-spotting in mice, with a lack of pigment on the belly, tail tip, and paws. Here we describe moonlight (mnlt), a second hypopigmentation and white-spotting mutation identified on the C57BL/6J background, which yields a phenotypic copy of m/m coat color traits. We demonstrate that the 2 mutations are allelic. m/m and mnlt/mnlt phenotypes both result from mutations that truncate the dedicator of cytokinesis 7 protein (DOCK7), a widely expressed Rho family guanine nucleotide exchange factor. Although Dock7 is transcribed at high levels in the developing brain and has been implicated in both axon development and myelination by in vitro studies, we find no requirement for DOCK7 in neurobehavioral function in vivo. However, DOCK7 has non-redundant role(s) related to the distribution and function of dermal and follicular melanocytes.
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Affiliation(s)
| | | | | | - Yu Xia
- Departments of Genetics and
| | | | | | | | - Antonella Zampolli
- Molecular and Experimental Medicine, The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, CA 92037
| | - Zaverio M. Ruggeri
- Molecular and Experimental Medicine, The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, CA 92037
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Ongusaha PP, Lee SW. Maximizing tumor cell invasion. Pigment Cell Melanoma Res 2009; 22:148-9. [PMID: 19175753 DOI: 10.1111/j.1755-148x.2009.00542.x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Brenner M, Hearing VJ. Modifying skin pigmentation - approaches through intrinsic biochemistry and exogenous agents. ACTA ACUST UNITED AC 2008; 5:e189-e199. [PMID: 19578486 DOI: 10.1016/j.ddmec.2008.02.001] [Citation(s) in RCA: 65] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Abstract
Rates of skin cancer continue to increase despite the improved use of traditional sunscreens to minimize damage from ultraviolet radiation. The public perception of tanned skin as being healthy and desirable, combined with the rising demand for treatments to repair irregular skin pigmentation and the desire to increase or decrease constitutive skin pigmentation, arouses great interest pharmaceutically as well as cosmeceutically. This review discusses the intrinsic biochemistry of pigmentation, details mechanisms that lead to increased or decreased skin pigmentation, and summarizes established and potential hyper- and hypo-pigmenting agents and their modes of action.
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Affiliation(s)
- Michaela Brenner
- Laboratory of Cell Biology, National Cancer Institute, National Institutes of Health, Bethesda MD 20892, USA
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Joshi PG, Nair N, Begum G, Joshi NB, Sinkar VP, Vora S. Melanocyte-keratinocyte interaction induces calcium signalling and melanin transfer to keratinocytes. ACTA ACUST UNITED AC 2007; 20:380-4. [PMID: 17850511 DOI: 10.1111/j.1600-0749.2007.00397.x] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Abstract
Physical contact between melanocytes and keratinocytes is a prerequisite for melanosome transfer to occur, but cellular signals induced during or after contact are not fully understood. Herein, it is shown that interactions between melanocyte and keratinocyte plasma membranes induced a transient intracellular calcium signal in keratinocytes that was required for pigment transfer. This intracellular calcium signal occurred due to release of calcium from intracellular stores. Pigment transfer observed in melanocyte-keratinocyte co-cultures was inhibited when intracellular calcium in keratinocytes was chelated. We propose that a 'ligand-receptor' type interaction exists between melanocytes and keratinocytes that triggers intracellular calcium signalling in keratinocytes and mediates melanin transfer.
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Affiliation(s)
- Preeti G Joshi
- National Institute of Mental Health and Neurosciences, Department of Biophysics, Bangalore, India
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Scott G, Fricke A, Fender A, McClelland L, Jacobs S. Prostaglandin E2 regulates melanocyte dendrite formation through activation of PKCzeta. Exp Cell Res 2007; 313:3840-50. [PMID: 17850789 PMCID: PMC2330264 DOI: 10.1016/j.yexcr.2007.07.039] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2007] [Revised: 07/05/2007] [Accepted: 07/30/2007] [Indexed: 12/11/2022]
Abstract
Prostaglandins are lipid signaling intermediates released by keratinocytes in response to ultraviolet irradiation (UVR) in the skin. The main prostaglandin released following UVR is PGE(2), a ligand for 4 related G-protein-coupled receptors (EP(1), EP(2), EP(3) and EP(4)). Our previous work established that PGE(2) stimulates melanocyte dendrite formation through activation of the EP(1) and EP(3) receptors. The purpose of the present report is to define the signaling intermediates involved in EP(1)- and EP(3)-dependent dendrite formation in human melanocytes. We recently showed that activation of the atypical PKCzeta isoform stimulates melanocyte dendricity in response to treatment with lysophosphatidylcholine. We therefore examined the potential contribution of PKCzeta activation on EP(1)- and EP(3)-dependent dendrite formation in melanocytes. Stimulation of the EP(1) and EP(3) receptors by selective agonists activated PKCzeta, and inhibition of PKCzeta activation abrogated EP(1)- and EP(3)-receptor-mediated melanocyte dendricity. Because of the importance of Rho-GTP binding proteins in the regulation of melanocyte dendricity, we also examined the effect of EP(1) and EP(3) receptor activation on Rac and Rho activity. Neither Rac nor Rho was activated upon treatment with EP(1,3)-receptor agonists. We show that melanocytes express only the EP(3A1) isoform, but not the EP(3B) receptor isoform, previously associated with Rho activation, consistent with a lack of Rho stimulation by EP(3) agonists. Our data suggest that PKCzeta activation plays a predominant role in regulation of PGE(2)-dependent melanocyte dendricity.
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Affiliation(s)
- Glynis Scott
- Department of Dermatology, University of Rochester School of Medicine, Rochester, NY 14642, USA.
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Cardinali G, Bolasco G, Aspite N, Lucania G, Lotti LV, Torrisi MR, Picardo M. Melanosome transfer promoted by keratinocyte growth factor in light and dark skin-derived keratinocytes. J Invest Dermatol 2007; 128:558-67. [PMID: 17882267 DOI: 10.1038/sj.jid.5701063] [Citation(s) in RCA: 66] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
The transfer of melanin from melanocytes to keratinocytes is upregulated by UV radiation and modulated by autocrine and paracrine factors. Among them, the keratinocyte growth factor (KGF/FGF7) promotes melanosome transfer acting on the recipient keratinocytes through stimulation of the phagocytic process. To search for possible differences in the melanosome uptake of keratinocytes from different skin color, we analyzed the uptake kinetics and distribution pattern of fluorescent latex beads in primary cultures of light and dark skin-derived keratinocytes stimulated with KGF and we compared the direct effect of KGF on the melanosome transfer in co-cultures of human primary melanocytes with light and dark keratinocytes. KGF-promoted melanosome transfer was more significant in light keratinocytes compared to dark, due to an increased expression of KGF receptor in light skin keratinocytes. Colocalization studies performed by confocal microscopy using FITC-dextran as a phagocytic marker and fluorescent beads as well as inhibition of particle uptake by cytochalasin D, revealed that beads internalization induced by KGF occurs via actin-dependent phagocytosis. 3D image reconstruction by fluorescence microscopy and ultrastructural analysis through transmission electron microscopy showed differences in the distribution pattern of the beads in light and dark keratinocytes, consistent with the different melanosome distribution in human skin.
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