51
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Consalez GG, Goldowitz D, Casoni F, Hawkes R. Origins, Development, and Compartmentation of the Granule Cells of the Cerebellum. Front Neural Circuits 2021; 14:611841. [PMID: 33519389 PMCID: PMC7843939 DOI: 10.3389/fncir.2020.611841] [Citation(s) in RCA: 81] [Impact Index Per Article: 27.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2020] [Accepted: 12/17/2020] [Indexed: 12/21/2022] Open
Abstract
Granule cells (GCs) are the most numerous cell type in the cerebellum and indeed, in the brain: at least 99% of all cerebellar neurons are granule cells. In this review article, we first consider the formation of the upper rhombic lip, from which all granule cell precursors arise, and the way by which the upper rhombic lip generates the external granular layer, a secondary germinal epithelium that serves to amplify the upper rhombic lip precursors. Next, we review the mechanisms by which postmitotic granule cells are generated in the external granular layer and migrate radially to settle in the granular layer. In addition, we review the evidence that far from being a homogeneous population, granule cells come in multiple phenotypes with distinct topographical distributions and consider ways in which the heterogeneity of granule cells might arise during development.
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Affiliation(s)
- G Giacomo Consalez
- Division of Neuroscience, San Raffaele Scientific Institute, San Raffaele University, Milan, Italy
| | - Daniel Goldowitz
- Department of Medical Genetics, Centre for Molecular Medicine and Therapeutics, University of British Columbia, Vancouver, BC, Canada
| | - Filippo Casoni
- Division of Neuroscience, San Raffaele Scientific Institute, San Raffaele University, Milan, Italy
| | - Richard Hawkes
- Department of Cell Biology and Anatomy, Hotchkiss Brain Institute, Cumming School of Medicine, University of Calgary, Calgary, AB, Canada
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52
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Ding J, Li HY, Zhang L, Zhou Y, Wu J. Hedgehog Signaling, a Critical Pathway Governing the Development and Progression of Hepatocellular Carcinoma. Cells 2021; 10:cells10010123. [PMID: 33440657 PMCID: PMC7826706 DOI: 10.3390/cells10010123] [Citation(s) in RCA: 22] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2020] [Revised: 01/03/2021] [Accepted: 01/07/2021] [Indexed: 02/08/2023] Open
Abstract
Hedgehog (Hh) signaling is a classic morphogen in controlling embryonic development and tissue repairing. Aberrant activation of Hh signaling has been well documented in liver cancer, including hepatoblastoma, hepatocellular carcinoma (HCC) and cholangiocarcinoma. The present review aims to update the current understanding on how abnormal Hh signaling molecules modulate initiation, progression, drug resistance and metastasis of HCC. The latest relevant literature was reviewed with our recent findings to provide an overview regarding the molecular interplay and clinical relevance of the Hh signaling in HCC management. Hh signaling molecules are involved in the transformation of pre-carcinogenic lesions to malignant features in chronic liver injury, such as nonalcoholic steatohepatitis. Activation of GLI target genes, such as ABCC1 and TAP1, is responsible for drug resistance in hepatoma cells, with a CD133−/EpCAM− surface molecular profile, and GLI1 and truncated GLI1 account for the metastatic feature of the hepatoma cells, with upregulation of matrix metalloproteinases. A novel bioassay for the Sonic Hh ligand in tissue specimens may assist HCC diagnosis with negative α-fetoprotein and predict early microvascular invasion. In-depth exploration of the Hh signaling deepens our understanding of its molecular modulation in HCC initiation, drug sensitivity and metastasis, and guides precise management of HCC on an individual basis.
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Affiliation(s)
- Jia Ding
- Department of Gastroenterology, Shanghai Jing’an District Central Hospital, Fudan University, Shanghai 200040, China;
| | - Hui-Yan Li
- Department of Medical Microbiology and Parasitology, MOE/NHC Key Laboratory of Medical Molecular Virology, School of Basic Medical Sciences, Shanghai Medical College, Fudan University, Shanghai 200032, China; (H.-Y.L.); (L.Z.); (Y.Z.)
| | - Li Zhang
- Department of Medical Microbiology and Parasitology, MOE/NHC Key Laboratory of Medical Molecular Virology, School of Basic Medical Sciences, Shanghai Medical College, Fudan University, Shanghai 200032, China; (H.-Y.L.); (L.Z.); (Y.Z.)
| | - Yuan Zhou
- Department of Medical Microbiology and Parasitology, MOE/NHC Key Laboratory of Medical Molecular Virology, School of Basic Medical Sciences, Shanghai Medical College, Fudan University, Shanghai 200032, China; (H.-Y.L.); (L.Z.); (Y.Z.)
| | - Jian Wu
- Department of Medical Microbiology and Parasitology, MOE/NHC Key Laboratory of Medical Molecular Virology, School of Basic Medical Sciences, Shanghai Medical College, Fudan University, Shanghai 200032, China; (H.-Y.L.); (L.Z.); (Y.Z.)
- Department of Gastroenterology & Hepatology, Zhongshan Hospital of Fudan University, Shanghai 200032, China
- Shanghai Institute of Liver Diseases, Shanghai Medical College, Fudan University, Shanghai 200032, China
- Correspondence: ; Tel.: +86-215-423-7705; Fax: +86-216-422-7201
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53
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Qi Q, Dong Z, Zhang N, Wang L, Shao C, Xu W. Cloning, expression and functional analysis of the desert hedgehog (dhh) gene in Chinese tongue sole (Cynoglossus semilaevis). Gene Expr Patterns 2020; 39:119163. [PMID: 33359643 DOI: 10.1016/j.gep.2020.119163] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2020] [Revised: 12/02/2020] [Accepted: 12/18/2020] [Indexed: 12/24/2022]
Abstract
Desert hedgehog (dhh) is a gene that is crucial for spermatogenesis and Leydig cell differentiation, but little is known regarding its influence on gonadal differentiation and development in fish. To understand its function, we cloned and characterized the dhh gene from Cynoglossus semilaevis (csdhh). The full length csdhh cDNA was 2473 bp, including a 1386 bp open reading frame (ORF), a 475 bp 5'-UTR, and a 612 bp 3'-UTR, encoding a predicted protein of 461 amino acid residues. Phylogenetic analysis showed that the putative protein belongs to the hedgehog (HH) family, and contains typical HH-N and HH-C domains. Amino acid sequence analysis revealed that CsDhh shares many features with Dhh analogues in other teleost species. Real-time quantitative PCR showed that csdhh was detected in eight different tissues in male and female tongue sole. During early embryonic development, the relative expression of the csdhh was significantly higher in the neural stage than in other embryonic developmental stages (P < 0.05). csdhh was detected at 20 days after hatching (dah) and at the critical period of male gonadal differentiation (80-95 dah), the relative expression of the csdhh was significantly higher in the male gonads than the female gonads. In 5, 8, and 12 month old gonads, the relative expression of the csdhh was significantly higher in male and pseudo-male than in female fish. The in situ hybridization (ISH) results showed that the hybridization signal was strongly expressed in primary and secondary spermatocytes, spermatids, and sertoli cells of the 1-year-old fish testis, with only weak signal expression in the corresponding ovarian tissue. These results suggest that csdhh is highly conserved in evolution and plays an important role in spermatogenesis in males and pseudo-males.
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Affiliation(s)
- Qian Qi
- Henan University of Science and Technology, Luoyang, 471000, China; Yellow Sea Fisheries Research Institute, Chinese Academy of Fishery Science (CAFS), Laboratory for Marine Fisheries Science and Food Production Processes, Pilot National Laboratory for Marine Science and Technology Qingdao, 266071, China
| | - Zhongdian Dong
- Guangdong South China Sea Key Laboratory of Aquaculture for Aquatic Economic Animals, Guangdong Ocean University, Zhanjiang, 524088, China
| | - Ning Zhang
- Guangdong South China Sea Key Laboratory of Aquaculture for Aquatic Economic Animals, Guangdong Ocean University, Zhanjiang, 524088, China
| | - Liang Wang
- Yantai Marine Economic Research Institute, Yantai, 264003, China
| | - Changwei Shao
- Yellow Sea Fisheries Research Institute, Chinese Academy of Fishery Science (CAFS), Laboratory for Marine Fisheries Science and Food Production Processes, Pilot National Laboratory for Marine Science and Technology Qingdao, 266071, China
| | - Wenteng Xu
- Yellow Sea Fisheries Research Institute, Chinese Academy of Fishery Science (CAFS), Laboratory for Marine Fisheries Science and Food Production Processes, Pilot National Laboratory for Marine Science and Technology Qingdao, 266071, China.
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Abstract
The mammalian cerebral cortex is the pinnacle of brain evolution, reaching its maximum complexity in terms of neuron number, diversity and functional circuitry. The emergence of this outstanding complexity begins during embryonic development, when a limited number of neural stem and progenitor cells manage to generate myriads of neurons in the appropriate numbers, types and proportions, in a process called neurogenesis. Here we review the current knowledge on the regulation of cortical neurogenesis, beginning with a description of the types of progenitor cells and their lineage relationships. This is followed by a review of the determinants of neuron fate, the molecular and genetic regulatory mechanisms, and considerations on the evolution of cortical neurogenesis in vertebrates leading to humans. We finish with an overview on how dysregulation of neurogenesis is a leading cause of human brain malformations and functional disabilities.
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Affiliation(s)
- Ana Villalba
- Instituto de Neurociencias, Consejo Superior de Investigaciones Científicas & Universidad Miguel Hernández, Sant Joan d'Alacant, Spain
| | - Magdalena Götz
- Institute for Stem Cell Research, Helmholtz Zentrum München & Biomedical Center, Ludwig-Maximilians Universitaet, Planegg-Martinsried, Germany
| | - Víctor Borrell
- Instituto de Neurociencias, Consejo Superior de Investigaciones Científicas & Universidad Miguel Hernández, Sant Joan d'Alacant, Spain.
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Echevarría-Andino ML, Allen BL. The hedgehog co-receptor BOC differentially regulates SHH signaling during craniofacial development. Development 2020; 147:dev.189076. [PMID: 33060130 DOI: 10.1242/dev.189076] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2020] [Accepted: 10/06/2020] [Indexed: 12/31/2022]
Abstract
The Hedgehog (HH) pathway controls multiple aspects of craniofacial development. HH ligands signal through the canonical receptor PTCH1, and three co-receptors: GAS1, CDON and BOC. Together, these co-receptors are required during embryogenesis to mediate proper HH signaling. Here, we investigated the individual and combined contributions of GAS1, CDON and BOC to HH-dependent mammalian craniofacial development. Notably, individual deletion of either Gas1 or Cdon results in variable holoprosencephaly phenotypes in mice, even on a congenic background. In contrast, we find that Boc deletion results in facial widening that correlates with increased HH target gene expression. In addition, Boc deletion in a Gas1 null background partially ameliorates the craniofacial defects observed in Gas1 single mutants; a phenotype that persists over developmental time, resulting in significant improvements to a subset of craniofacial structures. This contrasts with HH-dependent phenotypes in other tissues that significantly worsen following combined deletion of Gas1 and Boc Together, these data indicate that BOC acts as a multi-functional regulator of HH signaling during craniofacial development, alternately promoting or restraining HH pathway activity in a tissue-specific fashion.
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Affiliation(s)
| | - Benjamin L Allen
- Department of Cell and Developmental Biology, University of Michigan, Ann Arbor, MI 48109, USA
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56
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Phosphatase magnesium-dependent 1 δ (PPM1D), serine/threonine protein phosphatase and novel pharmacological target in cancer. Biochem Pharmacol 2020; 184:114362. [PMID: 33309518 DOI: 10.1016/j.bcp.2020.114362] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2020] [Revised: 12/04/2020] [Accepted: 12/07/2020] [Indexed: 12/20/2022]
Abstract
Aberrations in DNA damage response genes are recognized mediators of tumorigenesis and resistance to chemo- and radiotherapy. While protein phosphatase magnesium-dependent 1 δ (PPM1D), located on the long arm of chromosome 17 at 17q22-23, is a key regulator of cellular responses to DNA damage, amplification, overexpression, or mutation of this gene is important in a wide range of pathologic processes. In this review, we describe the physiologic function of PPM1D, as well as its role in diverse processes, including fertility, development, stemness, immunity, tumorigenesis, and treatment responsiveness. We highlight both the advances and limitations of current approaches to targeting malignant processes mediated by pathogenic alterations in PPM1D with the goal of providing rationale for continued research and development of clinically viable treatment approaches for PPM1D-associated diseases.
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57
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Sonic Hedgehog Signature in Pediatric Primary Bone Tumors: Effects of the GLI Antagonist GANT61 on Ewing's Sarcoma Tumor Growth. Cancers (Basel) 2020; 12:cancers12113438. [PMID: 33228057 PMCID: PMC7699338 DOI: 10.3390/cancers12113438] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2020] [Revised: 11/16/2020] [Accepted: 11/17/2020] [Indexed: 01/07/2023] Open
Abstract
Simple Summary The poor clinical outcomes for Osteosarcoma (OS) and Ewing’s sarcoma (ES) patients underscore the urgency of developing novel therapeutic strategies for these pathologies. In this context, the emerging role of Sonic hedgehog (SHH) signaling in cancer has been critically evaluated, focusing on the potential for targeting SHH signaling as an anticancer strategy. The aims of this work were (1) to highlight and to compare a possible SHH/Gli signature between OS and ES, (2) to strengthen our knowledge concerning the role of EWS-FLI1 in the SHH signature in ES and (3) to evaluate the effect of the specific Gli inhibitor GANT61 in vivo on the growth of ES tumors using an orthotopic mice model. Our work identifies Gli1 as a promising therapeutic target in ES and demonstrates that GANT61, through inhibition of Gli1 transcriptional activity, may be a promising therapeutic strategy hindering ES tumor progression, and specifically primary tumor growth. Abstract Osteosarcoma (OS) and Ewing’s sarcoma (ES) are the most common malignant bone tumors in children and adolescents. In many cases, the prognosis remains very poor. The Sonic hedgehog (SHH) signaling pathway, strongly involved in the development of many cancers, regulate transcription via the transcriptional factors Gli1-3. In this context, RNAseq analysis of OS and ES cell lines reveals an increase of some major compounds of the SHH signaling cascade in ES cells, such as the transcriptional factor Gli1. This increase leads to an augmentation of the transcriptional response of Gli1 in ES cell lines, demonstrating a dysregulation of Gli1 signaling in ES cells and thus the rationale for targeting Gli1 in ES. The use of a preclinical model of ES demonstrates that GANT61, an inhibitor of the transcriptional factor Gli1, reduces ES primary tumor growth. In vitro experiments show that GANT61 decreases the viability of ES cell, mainly through its ability to induce caspase-3/7-dependent cell apoptosis. Taken together, these results demonstrates that GANT61 may be a promising therapeutic strategy for inhibiting the progression of primary ES tumors.
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58
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Novel PTCH1 mutations in Japanese familial nevoid basal cell carcinoma syndrome. Hum Genome Var 2020; 7:38. [PMID: 33298892 PMCID: PMC7674431 DOI: 10.1038/s41439-020-00126-6] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2020] [Revised: 10/20/2020] [Accepted: 10/22/2020] [Indexed: 12/01/2022] Open
Abstract
Nevoid basal cell carcinoma syndrome (NBCCS), also known as Gorlin syndrome, is inherited in an autosomal dominant manner and is characterized by a combination of developmental abnormalities and a predisposition to tumor formation. Hedgehog receptor Patched 1 (PTCH1) has been identified as the mutated gene in NBCCS. We identified the PTCH1_c.3298_3299insAAG_p.1099_1100insE mutation in the transmembrane region, which comprises a sterol transporter whose abnormal function is reportedly related to pathogenicity.
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59
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Larsen LJ, Møller LB. Crosstalk of Hedgehog and mTORC1 Pathways. Cells 2020; 9:cells9102316. [PMID: 33081032 PMCID: PMC7603200 DOI: 10.3390/cells9102316] [Citation(s) in RCA: 36] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2020] [Revised: 09/30/2020] [Accepted: 10/13/2020] [Indexed: 02/07/2023] Open
Abstract
Hedgehog (Hh) signaling and mTOR signaling, essential for embryonic development and cellular metabolism, are both coordinated by the primary cilium. Observations from cancer cells strongly indicate crosstalk between Hh and mTOR signaling. This hypothesis is supported by several studies: Evidence points to a TGFβ-mediated crosstalk; Increased PI3K/AKT/mTOR activity leads to increased Hh signaling through regulation of the GLI transcription factors; increased Hh signaling regulates mTORC1 activity positively by upregulating NKX2.2, leading to downregulation of negative mTOR regulators; GSK3 and AMPK are, as members of both signaling pathways, potentially important links between Hh and mTORC1 signaling; The kinase DYRK2 regulates Hh positively and mTORC1 signaling negatively. In contrast, both positive and negative regulation of Hh has been observed for DYRK1A and DYRK1B, which both regulate mTORC1 signaling positively. Based on crosstalk observed between cilia, Hh, and mTORC1, we suggest that the interaction between Hh and mTORC1 is more widespread than it appears from our current knowledge. Although many studies focusing on crosstalk have been carried out, contradictory observations appear and the interplay involving multiple partners is far from solved.
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60
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Wierbowski BM, Petrov K, Aravena L, Gu G, Xu Y, Salic A. Hedgehog Pathway Activation Requires Coreceptor-Catalyzed, Lipid-Dependent Relay of the Sonic Hedgehog Ligand. Dev Cell 2020; 55:450-467.e8. [PMID: 33038332 DOI: 10.1016/j.devcel.2020.09.017] [Citation(s) in RCA: 37] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2020] [Revised: 08/04/2020] [Accepted: 09/14/2020] [Indexed: 12/25/2022]
Abstract
Hedgehog signaling governs critical processes in embryogenesis, adult stem cell maintenance, and tumorigenesis. The activating ligand, Sonic hedgehog (SHH), is highly hydrophobic because of dual palmitate and cholesterol modification, and thus, its release from cells requires the secreted SCUBE proteins. We demonstrate that the soluble SCUBE-SHH complex, although highly potent in cellular assays, cannot directly signal through the SHH receptor, Patched1 (PTCH1). Rather, signaling by SCUBE-SHH requires a molecular relay mediated by the coreceptors CDON/BOC and GAS1, which relieves SHH inhibition by SCUBE. CDON/BOC bind both SCUBE and SHH, recruiting the complex to the cell surface. SHH is then handed off, in a dual lipid-dependent manner, to GAS1, and from GAS1 to PTCH1, initiating signaling. These results define an essential step in Hedgehog signaling, whereby coreceptors activate SHH by chaperoning it from a latent extracellular complex to its cell-surface receptor, and point to a broader paradigm of coreceptor function.
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Affiliation(s)
| | - Kostadin Petrov
- Department of Cell Biology, Harvard Medical School, Boston, MA 02115, USA
| | - Laura Aravena
- Department of Cell Biology, Harvard Medical School, Boston, MA 02115, USA
| | - Garrick Gu
- Williams College, Williamstown, MA 01267, USA
| | - Yangqing Xu
- Department of Cell Biology, Harvard Medical School, Boston, MA 02115, USA
| | - Adrian Salic
- Department of Cell Biology, Harvard Medical School, Boston, MA 02115, USA.
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61
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Stojanov IJ, Schaefer IM, Menon RS, Wasman J, Gokozan HN, Garcia EP, Baur DA, Woo SB, Sholl LM. Biallelic PTCH1 Inactivation Is a Dominant Genomic Change in Sporadic Keratocystic Odontogenic Tumors. Am J Surg Pathol 2020; 44:553-560. [PMID: 31725470 DOI: 10.1097/pas.0000000000001407] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
Keratocystic odontogenic tumors (KCOTs) are locally aggressive odontogenic neoplasms with recurrence rates of up to 60%. Approximately 5% of KCOTs are associated with nevoid basal cell carcinoma (Gorlin) syndrome and 90% of these show genomic inactivation of the PTCH1 gene encoding Patched 1. Sporadic KCOTs reportedly have PTCH1 mutations in 30% of cases, but previous genomic analyses have been limited by low tumor DNA yield. The aim of this study was to identify recurrent genomic aberrations in sporadic KCOTs using a next-generation sequencing panel with complete exonic coverage of sonic hedgehog (SHH) pathway members PTCH1, SMO, SUFU, GLI1, and GLI2. Included were 44 sporadic KCOTs from 23 female and 21 male patients with a median age of 50 years (range, 10 to 82 y) and located in the mandible (N=33) or maxilla (N=11). Sequencing identified PTCH1 inactivating mutations in 41/44 (93%) cases, with biallelic inactivation in 35 (80%) cases; 9q copy neutral loss of heterozygosity targeting the PTCH1 locus was identified in 15 (34%) cases. No genomic aberrations were identified in other sequenced SHH pathway members. In summary, we demonstrate PTCH1 inactivating mutations in 93% of sporadic KCOTs, indicating that SHH pathway alterations are a near-universal event in these benign but locally aggressive neoplasms. The high frequency of complete PTCH1 loss of function may provide a rational target for SHH pathway inhibitors to be explored in future studies.
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Affiliation(s)
- Ivan J Stojanov
- Departments of Oral and Maxillofacial Medicine.,Department of Pathology, Case Western Reserve University School of Medicine
| | - Inga-Marie Schaefer
- Department of Pathology, Brigham and Women's Hospital, Harvard Medical School
| | - Reshma S Menon
- Department of Oral Medicine, Infection and Immunity, Harvard School of Dental Medicine, Boston
| | - Jay Wasman
- Department of Pathology, University Hospitals Cleveland Medical Center, Case Western Reserve University School of Medicine, Cleveland, OH
| | - Hamza N Gokozan
- Department of Pathology, University Hospitals Cleveland Medical Center, Case Western Reserve University School of Medicine, Cleveland, OH
| | - Elizabeth P Garcia
- Department of Pathology, Brigham and Women's Hospital, Harvard Medical School
| | - Dale A Baur
- Oral and Maxillofacial Surgery, Case Western Reserve University School of Dental Medicine
| | - Sook-Bin Woo
- Department of Oral Medicine, Infection and Immunity, Harvard School of Dental Medicine, Boston.,Center for Oral Pathology, StrataDx Inc., Lexington, MA
| | - Lynette M Sholl
- Department of Pathology, Brigham and Women's Hospital, Harvard Medical School
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62
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Jiang W, Yao X, Shan Z, Li W, Gao Y, Zhang Q. E3 ligase Herc4 regulates Hedgehog signalling through promoting Smoothened degradation. J Mol Cell Biol 2020; 11:791-803. [PMID: 30925584 PMCID: PMC7261483 DOI: 10.1093/jmcb/mjz024] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2018] [Revised: 11/24/2018] [Accepted: 12/21/2018] [Indexed: 12/21/2022] Open
Abstract
Hedgehog (Hh) signalling plays conserved roles in controlling embryonic development; its dysregulation causes many diseases including cancers. The G protein-coupled receptor Smoothened (Smo) is the key signal transducer of the Hh pathway, whose posttranslational regulation has been shown to be critical for its accumulation and activation. Ubiquitination has been reported an essential posttranslational regulation of Smo. Here, we identify a novel E3 ligase of Smo, Herc4, which binds to Smo, and regulates Hh signalling by controlling Smo ubiquitination and degradation. Interestingly, our data suggest that Herc4-mediated Smo degradation is regulated by Hh in PKA-primed phosphorylation-dependent and independent manners.
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Affiliation(s)
- Weirong Jiang
- State Key Laboratory of Pharmaceutical Biotechnology and MOE Key Laboratory of Model Animals for Disease Study, Model Animal Research Center of Nanjing University, Nanjing, China
| | - Xia Yao
- State Key Laboratory of Pharmaceutical Biotechnology and MOE Key Laboratory of Model Animals for Disease Study, Model Animal Research Center of Nanjing University, Nanjing, China
| | - Zhaoliang Shan
- State Key Laboratory of Pharmaceutical Biotechnology and MOE Key Laboratory of Model Animals for Disease Study, Model Animal Research Center of Nanjing University, Nanjing, China
| | - Wenting Li
- State Key Laboratory of Pharmaceutical Biotechnology and MOE Key Laboratory of Model Animals for Disease Study, Model Animal Research Center of Nanjing University, Nanjing, China
| | - Yuxue Gao
- State Key Laboratory of Pharmaceutical Biotechnology and MOE Key Laboratory of Model Animals for Disease Study, Model Animal Research Center of Nanjing University, Nanjing, China
| | - Qing Zhang
- State Key Laboratory of Pharmaceutical Biotechnology and MOE Key Laboratory of Model Animals for Disease Study, Model Animal Research Center of Nanjing University, Nanjing, China
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63
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Qi X, Li X. Mechanistic Insights into the Generation and Transduction of Hedgehog Signaling. Trends Biochem Sci 2020; 45:397-410. [PMID: 32311334 PMCID: PMC7174405 DOI: 10.1016/j.tibs.2020.01.006] [Citation(s) in RCA: 56] [Impact Index Per Article: 14.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2019] [Revised: 01/19/2020] [Accepted: 01/23/2020] [Indexed: 12/23/2022]
Abstract
Cell differentiation and proliferation require Hedgehog (HH) signaling and aberrant HH signaling causes birth defects or cancers. In this signaling pathway, the N-terminally palmitoylated and C-terminally cholesterylated HH ligand is secreted into the extracellular space with help of the Dispatched-1 (DISP1) and Scube2 proteins. The Patched-1 (PTCH1) protein releases its inhibition of the oncoprotein Smoothened (SMO) after binding the HH ligand, triggering downstream signaling events. In this review, we discuss the recent structural and biochemical studies on four major components of the HH pathway: the HH ligand, DISP1, PTCH1, and SMO. This research provides mechanistic insights into how HH signaling is generated and transduced from the cell surface into the intercellular space and will aid in facilitating the treatment of HH-related diseases.
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Affiliation(s)
- Xiaofeng Qi
- Department of Molecular Genetics, University of Texas Southwestern Medical Center, Dallas, TX 75390, USA.
| | - Xiaochun Li
- Department of Molecular Genetics, University of Texas Southwestern Medical Center, Dallas, TX 75390, USA; Department of Biophysics, University of Texas Southwestern Medical Center, Dallas, TX 75390, USA.
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64
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Choudhury A, Neumann NM, Raleigh DR, Lang UE. Clinical Implications of Primary Cilia in Skin Cancer. Dermatol Ther (Heidelb) 2020; 10:233-248. [PMID: 31997226 PMCID: PMC7090118 DOI: 10.1007/s13555-020-00355-1] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2019] [Indexed: 12/25/2022] Open
Abstract
The primary cilium is a cell surface organelle that is an important component of cellular biology. While it was once believed to be a vestigial structure without biologic function, it is now known to have essential roles in critical cellular signaling pathways such as Hedgehog (HH) and Wnt. The HH and Wnt pathways are involved in pathogenesis of basal cell carcinoma and melanoma, respectively, and this knowledge is now beginning to inform therapeutic and diagnostic options for patients. The purpose of this review is to familiarize clinicians with primary cilia biology and how this complex cellular organelle has started to translate into clinical care.
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Affiliation(s)
- Abrar Choudhury
- Department of Neurological Surgery, University of California, San Francisco, CA, USA
- Department of Radiation Oncology, University of California, San Francisco, CA, USA
| | - Neil M Neumann
- Department of Pathology, Dermatopathology Service, University of California, San Francisco, CA, USA
| | - David R Raleigh
- Department of Neurological Surgery, University of California, San Francisco, CA, USA
- Department of Radiation Oncology, University of California, San Francisco, CA, USA
| | - Ursula E Lang
- Department of Pathology, Dermatopathology Service, University of California, San Francisco, CA, USA.
- Department of Dermatology, University of California, San Francisco, CA, USA.
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65
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Lézot F, Corre I, Morice S, Rédini F, Verrecchia F. SHH Signaling Pathway Drives Pediatric Bone Sarcoma Progression. Cells 2020; 9:cells9030536. [PMID: 32110934 PMCID: PMC7140443 DOI: 10.3390/cells9030536] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2020] [Revised: 02/19/2020] [Accepted: 02/23/2020] [Indexed: 02/07/2023] Open
Abstract
Primary bone tumors can be divided into two classes, benign and malignant. Among the latter group, osteosarcoma and Ewing sarcoma are the most prevalent malignant primary bone tumors in children and adolescents. Despite intensive efforts to improve treatments, almost 40% of patients succumb to the disease. Specifically, the clinical outcome for metastatic osteosarcoma or Ewing sarcoma remains poor; less than 30% of patients who present metastases will survive 5 years after initial diagnosis. One common and specific point of these bone tumors is their ability to deregulate bone homeostasis and remodeling and divert them to their benefit. Over the past years, considerable interest in the Sonic Hedgehog (SHH) pathway has taken place within the cancer research community. The activation of this SHH cascade can be done through different ways and, schematically, two pathways can be described, the canonical and the non-canonical. This review discusses the current knowledge about the involvement of the SHH signaling pathway in skeletal development, pediatric bone sarcoma progression and the related therapeutic options that may be possible for these tumors.
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66
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Effect of mutations on drug resistance of smoothened receptor toward inhibitors probed by molecular modeling. Chem Phys Lett 2020. [DOI: 10.1016/j.cplett.2020.137126] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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67
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Wu Y, Li W, Yuan M, Liu X. The synthetic pyrethroid deltamethrin impairs zebrafish (Danio rerio) swim bladder development. THE SCIENCE OF THE TOTAL ENVIRONMENT 2020; 701:134870. [PMID: 31726413 DOI: 10.1016/j.scitotenv.2019.134870] [Citation(s) in RCA: 24] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/17/2019] [Revised: 09/26/2019] [Accepted: 10/05/2019] [Indexed: 06/10/2023]
Abstract
Deltamethrin (DM) is a widely used insecticide and reveals neural, cardiovascular and reproductive toxicity to various aquatic organisms. It has been known that DM negatively affects motion of zebrafish (Danio rerio). However, little is known in relation to the impacts of DM on development of swim bladder, which is a key organ for motion. In the present study, zebrafish embryos were exposed to 20 and 40 µg/L DM. The changes of swim bladder morphology were observed and transcription levels of key genes were compared between DM treatments and the control. The results showed that DM treatments significantly blocked the formation of progenitor and tissue layers in swim bladder of zebrafish embryos, leading to failed inflation of swim bladder. Compared with the control, the key genes (pbx1, foxA3, mnx1, has2, anxa5b, hprt1l and elovl1a) responsible for swim bladder development also showed decreased levels in response to DM treatments, suggesting that DM might specifically affect swim bladder development. Moreover, transcription levels of genes in the Wnt (wnt5b, tcf3a, wnt1, wnt9b, fzd1, fzd3 and fzd5) and Hedgehog (ihhb, ptc1 and ptc2) signaling pathways all decreased significantly in response to DM treatments, compared with the control. Considering the importance of Wnt and Hedgehog pathways in development of swim bladder, these results suggested that DM might affect swim bladder development through inhibiting the Wnt and Hedgehog pathways. Overall, the present study reported that swim bladder might be a potential target organ of DM toxicity in zebrafish, which contributed more information to the evaluation of DM's environmental risks.
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Affiliation(s)
- Yaqin Wu
- Key Laboratory of Xiamen Marine and Gene Drugs, School of Biomedical Sciences, Huaqiao University, Xiamen 361021, China
| | - Wenhua Li
- Key Laboratory of Xiamen Marine and Gene Drugs, School of Biomedical Sciences, Huaqiao University, Xiamen 361021, China.
| | - Mingrui Yuan
- Key Laboratory of Xiamen Marine and Gene Drugs, School of Biomedical Sciences, Huaqiao University, Xiamen 361021, China
| | - Xuan Liu
- Aquatic EcoHealth Group, Key Laboratory of Urban Environment and Health, Fujian Provincial Key Laboratory of Watershed Ecology, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China
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68
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Nguyen-Ba-Charvet KT, Rebsam A. Neurogenesis and Specification of Retinal Ganglion Cells. Int J Mol Sci 2020; 21:ijms21020451. [PMID: 31936811 PMCID: PMC7014133 DOI: 10.3390/ijms21020451] [Citation(s) in RCA: 29] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2019] [Revised: 01/07/2020] [Accepted: 01/08/2020] [Indexed: 12/25/2022] Open
Abstract
Across all species, retinal ganglion cells (RGCs) are the first retinal neurons generated during development, followed by the other retinal cell types. How are retinal progenitor cells (RPCs) able to produce these cell types in a specific and timely order? Here, we will review the different models of retinal neurogenesis proposed over the last decades as well as the extrinsic and intrinsic factors controlling it. We will then focus on the molecular mechanisms, especially the cascade of transcription factors that regulate, more specifically, RGC fate. We will also comment on the recent discovery that the ciliary marginal zone is a new stem cell niche in mice contributing to retinal neurogenesis, especially to the generation of ipsilateral RGCs. Furthermore, RGCs are composed of many different subtypes that are anatomically, physiologically, functionally, and molecularly defined. We will summarize the different classifications of RGC subtypes and will recapitulate the specification of some of them and describe how a genetic disease such as albinism affects neurogenesis, resulting in profound visual deficits.
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Zhong W, Zhao H, Huang W, Zhang M, Zhang Q, Zhang Y, Chen C, Nueraihemaiti Z, Tuerhong D, Huang H, Maimaitili G, Chen F, Lin J. Identification of rare PTCH1 nonsense variant causing orofacial cleft in a Chinese family and an up-to-date genotype-phenotype analysis. Genes Dis 2020; 8:689-697. [PMID: 34291140 PMCID: PMC8278535 DOI: 10.1016/j.gendis.2019.12.010] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2019] [Revised: 12/10/2019] [Accepted: 12/31/2019] [Indexed: 01/09/2023] Open
Abstract
The Patched 1 (PTCH1) gene encodes a membrane receptor involved in the Hedgehog (Hh) signaling pathway, an abnormal state of which may result in congenital defects or human tumors. In this study, we conducted whole-exome sequencing on a three-generation Chinese family characterized with variable penetrance of orofacial clefts. A rare heterozygous variant in the PTCH1 gene (c.2833C > T p.R945X) was identified as a disease-associated mutation. Structural modeling revealed a truncation starting from the middle of the second extracellular domain of PTCH1 protein. This may damage its ligand recognition and sterol transportation abilities, thereby affecting the Hh signaling pathway. Biochemical assays indicated that the R945X protein had reduced stability compared to the wild-type in vitro. In addition, we reviewed the locations and mutation types of PTCH1 variants in individuals with clefting phenotypes, and analyzed the associations between clefts and locations or types of variants within PTCH1. Our findings provide further evidence that PTCH1 variants result in orofacial clefts, and contributed to genetic counseling and clinical surveillance in this family.
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Affiliation(s)
- Wenjie Zhong
- Department of Orthodontics, Peking University School and Hospital of Stomatology, Beijing, 100081, PR China
| | - Huaxiang Zhao
- Department of Orthodontics, Peking University School and Hospital of Stomatology, Beijing, 100081, PR China
| | - Wenbin Huang
- Department of Orthodontics, Peking University School and Hospital of Stomatology, Beijing, 100081, PR China
| | - Mengqi Zhang
- Department of Orthodontics, Peking University School and Hospital of Stomatology, Beijing, 100081, PR China
| | - Qian Zhang
- Central Laboratory, Peking University School and Hospital of Stomatology, Beijing, 100081, PR China
| | - Yue Zhang
- Department of Stomatology, The Fifth Affiliated Hospital of Xinjiang Medical University, Urumqi, 830000, PR China
| | - Chong Chen
- Department of Stomatology, The Fifth Affiliated Hospital of Xinjiang Medical University, Urumqi, 830000, PR China
| | | | | | - Huizhe Huang
- Chongqing Medical University, Chongqing, 400016, PR China
| | - Gulibaha Maimaitili
- Department of Stomatology, The Fifth Affiliated Hospital of Xinjiang Medical University, Urumqi, 830000, PR China
| | - Feng Chen
- Central Laboratory, Peking University School and Hospital of Stomatology, Beijing, 100081, PR China
| | - Jiuxiang Lin
- Department of Orthodontics, Peking University School and Hospital of Stomatology, Beijing, 100081, PR China
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Tan L, Lei N, He M, Zhang M, Sun Q, Zeng S, Chen L, Zhou L, Meng X, Xu H. Scutellarin Protects against Human Colorectal Cancer in vitro by Down Regulation of Hedgehog Signaling Pathway Activity. INT J PHARMACOL 2019. [DOI: 10.3923/ijp.2020.53.62] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
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71
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Sasai N, Toriyama M, Kondo T. Hedgehog Signal and Genetic Disorders. Front Genet 2019; 10:1103. [PMID: 31781166 PMCID: PMC6856222 DOI: 10.3389/fgene.2019.01103] [Citation(s) in RCA: 81] [Impact Index Per Article: 16.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2019] [Accepted: 10/11/2019] [Indexed: 12/12/2022] Open
Abstract
The hedgehog (Hh) family comprises sonic hedgehog (Shh), Indian hedgehog (Ihh), and desert hedgehog (Dhh), which are versatile signaling molecules involved in a wide spectrum of biological events including cell differentiation, proliferation, and survival; establishment of the vertebrate body plan; and aging. These molecules play critical roles from embryogenesis to adult stages; therefore, alterations such as abnormal expression or mutations of the genes involved and their downstream factors cause a variety of genetic disorders at different stages. The Hh family involves many signaling mediators and functions through complex mechanisms, and achieving a comprehensive understanding of the entire signaling system is challenging. This review discusses the signaling mediators of the Hh pathway and their functions at the cellular and organismal levels. We first focus on the roles of Hh signaling mediators in signal transduction at the cellular level and the networks formed by these factors. Then, we analyze the spatiotemporal pattern of expression of Hh pathway molecules in tissues and organs, and describe the phenotypes of mutant mice. Finally, we discuss the genetic disorders caused by malfunction of Hh signaling-related molecules in humans.
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Affiliation(s)
- Noriaki Sasai
- Developmental Biomedical Science, Division of Biological Sciences, Nara Institute of Science and Technology, Ikoma, Japan
| | - Michinori Toriyama
- Systems Neurobiology and Medicine, Division of Biological Sciences, Nara Institute of Science and Technology, Ikoma, Japan
- Department of Biomedical Chemistry, School of Science and Technology, Kwansei Gakuin University, Sanda, Japan
| | - Toru Kondo
- Division of Stem Cell Biology, Institute for Genetic Medicine, Hokkaido University, Sapporo, Japan
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Iulianella A, Stanton-Turcotte D. The Hedgehog receptor Patched1 regulates proliferation, neurogenesis, and axon guidance in the embryonic spinal cord. Mech Dev 2019; 160:103577. [PMID: 31634536 DOI: 10.1016/j.mod.2019.103577] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2019] [Revised: 09/03/2019] [Accepted: 10/02/2019] [Indexed: 12/31/2022]
Abstract
The formation of the vertebrate nervous system depends on the complex interplay of morphogen signaling pathways and cell cycle progression to establish distinct cell fates. The Sonic hedgehog (Shh) signaling pathway is well understood to promote ventral cell fates in the developing spinal cord. A key regulator of Shh signaling is its receptor Patched1 (Ptch1). However, because the Ptch1 null mutation is lethal early in mouse embryogenesis, its role in controlling cell cycle progression, neurogenesis, and axon guidance in the developing spinal cord is not fully understood. An allele of Ptch1 called Wiggable (Ptch1Wig), which was previously shown to enhance Shh signaling, was used to test its ability to regulate neurogenesis and proliferation in the developing spinal cord. Ptch1Wig/Wig mutants displayed enhanced ventral proneural gene activation, and aberrant proliferation of the neural tube and floor plate cells, the latter normally being a quiescent population. The expression of the cell cycle regulators p27Kip1 and p57Kip2 were expanded in Ptch1Wig/Wig mutant spinal cords, as was the number of mitotic and S-phase nuclei, suggesting enhanced cell cycle progression. However, Ptch1Wig/Wig mutants also showed enhanced apoptosis in the ventral embryonic spinal cord, which resulted in thinner spinal cords at later embryonic stages. Commissural axons largely failed to cross the floor plate of Ptch1Wig/Wig mutant embryos, suggesting enhanced Shh signaling in these mutants led to a dorsal expansion of the chemoattraction front. These findings are consistent with a role of Ptch1 in regulating neurogenesis and proliferation of neural progenitors, and in restricting the influence of Shh signaling in commissural axon guidance to the floor plate.
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Affiliation(s)
- Angelo Iulianella
- Department of Medical Neuroscience, Faculty of Medicine and Brain Repair Centre, Dalhousie University, Life Science Research Institute, 1348 Summer Street, Halifax, Nova Scotia B3H-4R2, Canada.
| | - Danielle Stanton-Turcotte
- Department of Medical Neuroscience, Faculty of Medicine and Brain Repair Centre, Dalhousie University, Life Science Research Institute, 1348 Summer Street, Halifax, Nova Scotia B3H-4R2, Canada
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73
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Rudolf AF, Kinnebrew M, Kowatsch C, Ansell TB, El Omari K, Bishop B, Pardon E, Schwab RA, Malinauskas T, Qian M, Duman R, Covey DF, Steyaert J, Wagner A, Sansom MSP, Rohatgi R, Siebold C. The morphogen Sonic hedgehog inhibits its receptor Patched by a pincer grasp mechanism. Nat Chem Biol 2019; 15:975-982. [PMID: 31548691 PMCID: PMC6764859 DOI: 10.1038/s41589-019-0370-y] [Citation(s) in RCA: 41] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2019] [Accepted: 07/25/2019] [Indexed: 12/29/2022]
Abstract
Hedgehog (HH) ligands, classical morphogens that pattern embryonic tissues in all animals, are covalently coupled to two lipids-a palmitoyl group at the N terminus and a cholesteroyl group at the C terminus. While the palmitoyl group binds and inactivates Patched 1 (PTCH1), the main receptor for HH ligands, the function of the cholesterol modification has remained mysterious. Using structural and biochemical studies, along with reassessment of previous cryo-electron microscopy structures, we find that the C-terminal cholesterol attached to Sonic hedgehog (Shh) binds the first extracellular domain of PTCH1 and promotes its inactivation, thus triggering HH signaling. Molecular dynamics simulations show that this interaction leads to the closure of a tunnel through PTCH1 that serves as the putative conduit for sterol transport. Thus, Shh inactivates PTCH1 by grasping its extracellular domain with two lipidic pincers, the N-terminal palmitate and the C-terminal cholesterol, which are both inserted into the PTCH1 protein core.
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Affiliation(s)
- Amalie F Rudolf
- Division of Structural Biology, Wellcome Centre for Human Genetics, University of Oxford, Oxford, UK
| | - Maia Kinnebrew
- Departments of Biochemistry and Medicine, Stanford University School of Medicine, Stanford, CA, USA
| | - Christiane Kowatsch
- Division of Structural Biology, Wellcome Centre for Human Genetics, University of Oxford, Oxford, UK
| | - T Bertie Ansell
- Department of Biochemistry, University of Oxford, Oxford, UK
| | - Kamel El Omari
- Science Division, Diamond Light Source, Harwell Science and Innovation Campus, Didcot, UK
| | - Benjamin Bishop
- Division of Structural Biology, Wellcome Centre for Human Genetics, University of Oxford, Oxford, UK
| | - Els Pardon
- Structural Biology Brussels, Vrije Universiteit Brussel (VUB), Brussels, Belgium
- VIB-VUB Center for Structural Biology, VIB, Brussels, Belgium
| | - Rebekka A Schwab
- Division of Structural Biology, Wellcome Centre for Human Genetics, University of Oxford, Oxford, UK
| | - Tomas Malinauskas
- Division of Structural Biology, Wellcome Centre for Human Genetics, University of Oxford, Oxford, UK
| | - Mingxing Qian
- Department of Developmental Biology, Washington University School of Medicine, St. Louis, MO, USA
| | - Ramona Duman
- Science Division, Diamond Light Source, Harwell Science and Innovation Campus, Didcot, UK
| | - Douglas F Covey
- Department of Developmental Biology, Washington University School of Medicine, St. Louis, MO, USA
| | - Jan Steyaert
- Structural Biology Brussels, Vrije Universiteit Brussel (VUB), Brussels, Belgium
- VIB-VUB Center for Structural Biology, VIB, Brussels, Belgium
| | - Armin Wagner
- Science Division, Diamond Light Source, Harwell Science and Innovation Campus, Didcot, UK
| | - Mark S P Sansom
- Department of Biochemistry, University of Oxford, Oxford, UK
| | - Rajat Rohatgi
- Departments of Biochemistry and Medicine, Stanford University School of Medicine, Stanford, CA, USA.
| | - Christian Siebold
- Division of Structural Biology, Wellcome Centre for Human Genetics, University of Oxford, Oxford, UK.
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Chen Y, Yu H, Pask AJ, Fujiyama A, Suzuki Y, Sugano S, Shaw G, Renfree MB. Hormone-responsive genes in the SHH and WNT/β-catenin signaling pathways influence urethral closure and phallus growth. Biol Reprod 2019; 99:806-816. [PMID: 29767687 DOI: 10.1093/biolre/ioy117] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2017] [Accepted: 05/13/2018] [Indexed: 11/14/2022] Open
Abstract
Environmental endocrine disruptors (EEDs) that affect androgen or estrogen activity may disrupt gene regulation during phallus development to cause hypospadias or a masculinized clitoris. We treated developing male tammar wallabies with estrogen and females with androgen from day 20-40 postpartum (pp) during the androgen imprinting window of sensitivity. Estrogen inhibited phallus elongation but had no effect on urethral closure and did not significantly depress testicular androgen synthesis. Androgen treatment in females did not promote phallus elongation but initiated urethral closure. Phalluses were collected for transcriptome sequencing at day 50 pp when they first become sexually dimorphic to examine changes in two signaling pathways, sonic hedgehog (SHH) and wingless-type MMTV integration site family (WNT)/β-catenin. SHH mRNA and β-catenin were predominantly expressed in the urethral epithelium in the tammar phallus, as in eutherian mammals. Estrogen treatment and castration of males induced an upregulation of SHH, while androgen treatment downregulated SHH. These effects appear to be direct since we detected putative estrogen receptor α (ERα) and androgen receptor (AR) binding sites near SHH. WNT5A, like SHH, was downregulated by androgen, while WNT4 was upregulated in female phalluses after androgen treatment. After estrogen treatment, WIF1 and WNT7A were both downregulated in male phalluses. After castration, WNT9A was upregulated. These results suggest that SHH and WNT pathways are regulated by both estrogen and androgen to direct the proliferation and elongation of the phallus during differentiation. Their response to exogenous hormones makes these genes potential targets of EEDs in the etiology of abnormal phallus development including hypospadias.
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Affiliation(s)
- Yu Chen
- School of BioSciences, The University of Melbourne, Victoria, Australia
| | - Hongshi Yu
- School of BioSciences, The University of Melbourne, Victoria, Australia
| | - Andrew J Pask
- School of BioSciences, The University of Melbourne, Victoria, Australia
| | - Asao Fujiyama
- Advanced Genomics Center, National Institute of Genetics, Mishima, Shizuoka, Japan
| | - Yutaka Suzuki
- Department of Computational Biology and Medical Sciences, Graduate School of Frontier Sciences, The University of Tokyo, Tokyo, Japan
| | - Sumio Sugano
- Department of Computational Biology and Medical Sciences, Graduate School of Frontier Sciences, The University of Tokyo, Tokyo, Japan
| | - Geoff Shaw
- School of BioSciences, The University of Melbourne, Victoria, Australia
| | - Marilyn B Renfree
- School of BioSciences, The University of Melbourne, Victoria, Australia
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75
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Moramarco A, Himmelblau E, Miraglia E, Mallone F, Roberti V, Franzone F, Iacovino C, Giustini S, Lambiase A. Ocular manifestations in Gorlin-Goltz syndrome. Orphanet J Rare Dis 2019; 14:218. [PMID: 31533758 PMCID: PMC6749644 DOI: 10.1186/s13023-019-1190-6] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2019] [Accepted: 09/04/2019] [Indexed: 11/30/2022] Open
Abstract
Background Gorlin-Goltz syndrome, also known as nevoid basal cell carcinoma syndrome, is a rare genetic disorder that is transmitted in an autosomal dominant manner with complete penetrance and variable expressivity. It is caused in 85% of the cases with a known etiology by pathogenic variants in the PTCH1 gene, and is characterized by a wide range of developmental abnormalities and a predisposition to multiple neoplasms. The manifestations are multiple and systemic and consist of basal cell carcinomas in various regions, odontogenic keratocistic tumors and skeletal anomalies, to name the most frequent. Despite the scarce medical literature on the topic, ocular involvement in this syndrome is frequent and at the level of various ocular structures. Our study focuses on the visual apparatus and its annexes in subjects with this syndrome, in order to better understand how this syndrome affects the ocular system, and to evaluate with greater accuracy and precision the nature of these manifestations in this group of patients. Results Our study confirms the presence of the commonly cited ocular findings in the general literature regarding the syndrome [hypertelorism (45.5%), congenital cataract (18%), nystagmus (9%), colobomas (9%)] and highlights strabismus (63% of the patients), epiretinal membranes (36%) and myelinated optic nerve fiber layers (36%) as the most frequent ophthalmological findings in this group of patients. Conclusions The presence of characteristic and frequent ocular signs in the Gorlin- Goltz syndrome could help with the diagnostic process in subjects suspected of having the syndrome who do not yet have a diagnosis. The ophthalmologist has a role as part of a multidisciplinary team in managing these patients. The ophthalmological follow-up that these patients require, can allow, if necessary, a timely therapy that could improve the visual prognosis of such patients.
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Affiliation(s)
- Antonietta Moramarco
- Department of Sense Organs, Faculty of Medicine and Odontology, Sapienza University of Rome, Rome, Italy.
| | - Ehud Himmelblau
- Department of Sense Organs, Faculty of Medicine and Odontology, Sapienza University of Rome, Rome, Italy.
| | - Emanuele Miraglia
- Department of Internal Medicine and Medical Specialties, Unit of Dermatology, Sapienza University of Rome, Rome, Italy
| | - Fabiana Mallone
- Department of Sense Organs, Faculty of Medicine and Odontology, Sapienza University of Rome, Rome, Italy
| | - Vincenzo Roberti
- Department of Internal Medicine and Medical Specialties, Unit of Dermatology, Sapienza University of Rome, Rome, Italy
| | - Federica Franzone
- Department of Sense Organs, Faculty of Medicine and Odontology, Sapienza University of Rome, Rome, Italy
| | - Chiara Iacovino
- Department of Internal Medicine and Medical Specialties, Unit of Dermatology, Sapienza University of Rome, Rome, Italy
| | - Sandra Giustini
- Department of Internal Medicine and Medical Specialties, Unit of Dermatology, Sapienza University of Rome, Rome, Italy
| | - Alessandro Lambiase
- Department of Sense Organs, Faculty of Medicine and Odontology, Sapienza University of Rome, Rome, Italy
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Turner MW, Rossi M, Campfield V, French J, Hunt E, Wade E, McDougal OM. Steroidal alkaloid variation in Veratrum californicum as determined by modern methods of analytical analysis. Fitoterapia 2019; 137:104281. [PMID: 31381957 DOI: 10.1016/j.fitote.2019.104281] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2019] [Revised: 07/26/2019] [Accepted: 07/27/2019] [Indexed: 10/26/2022]
Abstract
Veratrum californicum is a rich source of steroidal alkaloids, many of which have proven to be antagonists of the Hedgehog (Hh) signaling pathway that becomes aberrant in over twenty types of cancer. These alkaloids first became known in the 1950's due to their teratogenic properties, which resulted in newborn and fetal lambs developing cyclopia as a result of pregnant ewes consuming Veratrum californicum. It was discovered that the alkaloids in V. californicum were concentrated in the root and rhizome of the plant with much lower amounts of the most active alkaloid, cyclopamine, present in the aerial plant, especially in the late growth season. Inspired by the limitations in analytical instrumentation and methods available to researchers at the time of the original investigation, we have used state-of-the-art instrumentation and modern analytical methods to quantitate four steroidal alkaloids based on study parameters including plant part, harvest location, and growth stage. The results of the current inquiry detail differences in alkaloid composition based on the study parameters, provide a detailed assessment for alkaloids that have been characterized previously (cyclopamine, veratramine, muldamine and isorubijervine), and identify at least six alkaloids that have not been previously characterized. This study provides insight into optimal harvest time, plant growth stage, harvest location, and plant part required to isolate, yet to be characterized, alkaloids of interest for exploration as Hh pathway antagonists with desirable medicinal properties.
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Affiliation(s)
- Matthew W Turner
- Biomolecular Sciences Graduate Programs, Boise State University, 1910 University Drive, Boise, Id, 83725, United States of America
| | - Meagan Rossi
- Department of Chemistry and Biochemistry, Boise State University, 1910 University Drive, Boise, Id, 83725, United States of America
| | - Vannessa Campfield
- Department of Chemistry and Biochemistry, Boise State University, 1910 University Drive, Boise, Id, 83725, United States of America
| | - John French
- Department of Chemistry and Biochemistry, Boise State University, 1910 University Drive, Boise, Id, 83725, United States of America
| | - Ellie Hunt
- Department of Chemistry and Biochemistry, Boise State University, 1910 University Drive, Boise, Id, 83725, United States of America
| | - Emily Wade
- Department of Chemistry and Biochemistry, Boise State University, 1910 University Drive, Boise, Id, 83725, United States of America
| | - Owen M McDougal
- Department of Chemistry and Biochemistry, Boise State University, 1910 University Drive, Boise, Id, 83725, United States of America.
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77
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Kowatsch C, Woolley RE, Kinnebrew M, Rohatgi R, Siebold C. Structures of vertebrate Patched and Smoothened reveal intimate links between cholesterol and Hedgehog signalling. Curr Opin Struct Biol 2019; 57:204-214. [PMID: 31247512 PMCID: PMC6744280 DOI: 10.1016/j.sbi.2019.05.015] [Citation(s) in RCA: 43] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2019] [Revised: 05/16/2019] [Accepted: 05/18/2019] [Indexed: 12/21/2022]
Abstract
The Hedgehog (HH) signalling pathway is a cell-cell communication system that controls the patterning of multiple tissues during embryogenesis in metazoans. In adults, HH signals regulate tissue stem cells and regenerative responses. Abnormal signalling can cause birth defects and cancer. The HH signal is received on target cells by Patched (PTCH1), the receptor for HH ligands, and then transmitted across the plasma membrane by Smoothened (SMO). Recent structural and biochemical studies have pointed to a sterol lipid, likely cholesterol itself, as the elusive second messenger that communicates the HH signal between PTCH1 and SMO, thus linking ligand reception to transmembrane signalling.
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Affiliation(s)
- Christiane Kowatsch
- Division of Structural Biology, Wellcome Centre for Human Genetics, University of Oxford, Oxford, UK
| | - Rachel E Woolley
- Division of Structural Biology, Wellcome Centre for Human Genetics, University of Oxford, Oxford, UK
| | - Maia Kinnebrew
- Departments of Biochemistry and Medicine, Stanford University School of Medicine, Stanford, CA, United States
| | - Rajat Rohatgi
- Departments of Biochemistry and Medicine, Stanford University School of Medicine, Stanford, CA, United States.
| | - Christian Siebold
- Division of Structural Biology, Wellcome Centre for Human Genetics, University of Oxford, Oxford, UK.
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Aravani D, Morris GE, Jones PD, Tattersall HK, Karamanavi E, Kaiser MA, Kostogrys RB, Ghaderi Najafabadi M, Andrews SL, Nath M, Ye S, Stringer EJ, Samani NJ, Webb TR. HHIPL1, a Gene at the 14q32 Coronary Artery Disease Locus, Positively Regulates Hedgehog Signaling and Promotes Atherosclerosis. Circulation 2019; 140:500-513. [PMID: 31163988 PMCID: PMC6686954 DOI: 10.1161/circulationaha.119.041059] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Abstract
Supplemental Digital Content is available in the text. Background: Genome-wide association studies have identified chromosome 14q32 as a locus for coronary artery disease. The disease-associated variants fall in a hitherto uncharacterized gene called HHIPL1 (hedgehog interacting protein-like 1), which encodes a sequence homolog of an antagonist of hedgehog signaling. The function of HHIPL1 and its role in atherosclerosis are unknown. Methods: HHIPL1 cellular localization, interaction with sonic hedgehog (SHH), and influence on hedgehog signaling were tested. HHIPL1 expression was measured in coronary artery disease–relevant human cells, and protein localization was assessed in wild-type and Apoe−/− (apolipoprotein E deficient) mice. Human aortic smooth muscle cell phenotypes and hedgehog signaling were investigated after gene knockdown. Hhipl1−/− mice were generated and aortic smooth muscle cells collected for phenotypic analysis and assessment of hedgehog signaling activity. Hhipl1−/− mice were bred onto both the Apoe−/− and Ldlr−/− (low-density lipoprotein receptor deficient) knockout strains, and the extent of atherosclerosis was quantified after 12 weeks of high-fat diet. Cellular composition and collagen content of aortic plaques were assessed by immunohistochemistry. Results: In vitro analyses revealed that HHIPL1 is a secreted protein that interacts with SHH and increases hedgehog signaling activity. HHIPL1 expression was detected in human smooth muscle cells and in smooth muscle within atherosclerotic plaques of Apoe−/− mice. The expression of Hhipl1 increased with disease progression in aortic roots of Apoe−/− mice. Proliferation and migration were reduced in Hhipl1 knockout mouse and HHIPL1 knockdown aortic smooth muscle cells, and hedgehog signaling was decreased in HHIPL1-deficient cells. Hhipl1 knockout caused a reduction of >50% in atherosclerosis burden on both Apoe−/− and Ldlr−/− knockout backgrounds, and lesions were characterized by reduced smooth muscle cell content. Conclusions: HHIPL1 is a secreted proatherogenic protein that enhances hedgehog signaling and regulates smooth muscle cell proliferation and migration. Inhibition of HHIPL1 protein function might offer a novel therapeutic strategy for coronary artery disease.
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Affiliation(s)
- Dimitra Aravani
- Department of Cardiovascular Sciences, University of Leicester and National Institute for Health Research Leicester Biomedical Research Centre, Glenfield Hospital, United Kingdom (D.A., G.E.M., P.D.J., H.K.T., E.K., M.A.K., M.G.N., S.L.A., M.N., S.Y., E.J.S., N.J.S., T.R.W.)
| | - Gavin E Morris
- Department of Cardiovascular Sciences, University of Leicester and National Institute for Health Research Leicester Biomedical Research Centre, Glenfield Hospital, United Kingdom (D.A., G.E.M., P.D.J., H.K.T., E.K., M.A.K., M.G.N., S.L.A., M.N., S.Y., E.J.S., N.J.S., T.R.W.)
| | - Peter D Jones
- Department of Cardiovascular Sciences, University of Leicester and National Institute for Health Research Leicester Biomedical Research Centre, Glenfield Hospital, United Kingdom (D.A., G.E.M., P.D.J., H.K.T., E.K., M.A.K., M.G.N., S.L.A., M.N., S.Y., E.J.S., N.J.S., T.R.W.)
| | - Helena K Tattersall
- Department of Cardiovascular Sciences, University of Leicester and National Institute for Health Research Leicester Biomedical Research Centre, Glenfield Hospital, United Kingdom (D.A., G.E.M., P.D.J., H.K.T., E.K., M.A.K., M.G.N., S.L.A., M.N., S.Y., E.J.S., N.J.S., T.R.W.)
| | - Elisavet Karamanavi
- Department of Cardiovascular Sciences, University of Leicester and National Institute for Health Research Leicester Biomedical Research Centre, Glenfield Hospital, United Kingdom (D.A., G.E.M., P.D.J., H.K.T., E.K., M.A.K., M.G.N., S.L.A., M.N., S.Y., E.J.S., N.J.S., T.R.W.)
| | - Michael A Kaiser
- Department of Cardiovascular Sciences, University of Leicester and National Institute for Health Research Leicester Biomedical Research Centre, Glenfield Hospital, United Kingdom (D.A., G.E.M., P.D.J., H.K.T., E.K., M.A.K., M.G.N., S.L.A., M.N., S.Y., E.J.S., N.J.S., T.R.W.)
| | - Renata B Kostogrys
- Department of Human Nutrition, Faculty of Food Technology, University of Agriculture in Kraków, Poland (R.B.K)
| | - Maryam Ghaderi Najafabadi
- Department of Cardiovascular Sciences, University of Leicester and National Institute for Health Research Leicester Biomedical Research Centre, Glenfield Hospital, United Kingdom (D.A., G.E.M., P.D.J., H.K.T., E.K., M.A.K., M.G.N., S.L.A., M.N., S.Y., E.J.S., N.J.S., T.R.W.)
| | - Sarah L Andrews
- Department of Cardiovascular Sciences, University of Leicester and National Institute for Health Research Leicester Biomedical Research Centre, Glenfield Hospital, United Kingdom (D.A., G.E.M., P.D.J., H.K.T., E.K., M.A.K., M.G.N., S.L.A., M.N., S.Y., E.J.S., N.J.S., T.R.W.)
| | - Mintu Nath
- Department of Cardiovascular Sciences, University of Leicester and National Institute for Health Research Leicester Biomedical Research Centre, Glenfield Hospital, United Kingdom (D.A., G.E.M., P.D.J., H.K.T., E.K., M.A.K., M.G.N., S.L.A., M.N., S.Y., E.J.S., N.J.S., T.R.W.)
| | - Shu Ye
- Department of Cardiovascular Sciences, University of Leicester and National Institute for Health Research Leicester Biomedical Research Centre, Glenfield Hospital, United Kingdom (D.A., G.E.M., P.D.J., H.K.T., E.K., M.A.K., M.G.N., S.L.A., M.N., S.Y., E.J.S., N.J.S., T.R.W.)
| | - Emma J Stringer
- Department of Cardiovascular Sciences, University of Leicester and National Institute for Health Research Leicester Biomedical Research Centre, Glenfield Hospital, United Kingdom (D.A., G.E.M., P.D.J., H.K.T., E.K., M.A.K., M.G.N., S.L.A., M.N., S.Y., E.J.S., N.J.S., T.R.W.)
| | - Nilesh J Samani
- Department of Cardiovascular Sciences, University of Leicester and National Institute for Health Research Leicester Biomedical Research Centre, Glenfield Hospital, United Kingdom (D.A., G.E.M., P.D.J., H.K.T., E.K., M.A.K., M.G.N., S.L.A., M.N., S.Y., E.J.S., N.J.S., T.R.W.)
| | - Tom R Webb
- Department of Cardiovascular Sciences, University of Leicester and National Institute for Health Research Leicester Biomedical Research Centre, Glenfield Hospital, United Kingdom (D.A., G.E.M., P.D.J., H.K.T., E.K., M.A.K., M.G.N., S.L.A., M.N., S.Y., E.J.S., N.J.S., T.R.W.)
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79
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Kanaki N, Matsuda A, Dejima K, Murata D, Nomura KH, Ohkura T, Gengyo-Ando K, Yoshina S, Mitani S, Nomura K. UDP-N-acetylglucosamine-dolichyl-phosphate N-acetylglucosaminephosphotransferase is indispensable for oogenesis, oocyte-to-embryo transition, and larval development of the nematode Caenorhabditis elegans. Glycobiology 2019; 29:163-178. [PMID: 30445613 DOI: 10.1093/glycob/cwy104] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2018] [Accepted: 11/09/2018] [Indexed: 12/13/2022] Open
Abstract
N-linked glycosylation of proteins is the most common post-translational modification of proteins. The enzyme UDP-N-acetylglucosamine-dolichyl-phosphate N-acetylglucosaminephosphotransferase (DPAGT1) catalyses the first step of N-glycosylation, and DPAGT1 knockout is embryonic lethal in mice. In this study, we identified the sole orthologue (algn-7) of the human DPAGT1 in the nematode C. elegans. The gene activity was disrupted by RNAi and deletion mutagenesis, which resulted in larval lethality, defects in oogenesis and oocyte-to-embryo transition. Endomitotic oocytes, abnormal fusion of pronuclei, abnormal AB cell rotation, disruption of permeation barriers of eggs, and abnormal expression of chitin and chitin synthase in oocytes and eggs were the typical phenotypes observed. The results indicate that N-glycosylation is indispensable for these processes. We further screened an N-glycosylated protein database of C. elegans, and identified 456 germline-expressed genes coding N-glycosylated proteins. By examining RNAi phenotypes, we identified five germline-expressed genes showing similar phenotypes to the algn-7 (RNAi) animals. They were ribo-1, stt-3, ptc-1, ptc-2, and vha-19. We identified known congenital disorders of glycosylation (CDG) genes (ribo-1 and stt-3) and a recently found CDG gene (vha-19). The results show that phenotype analyses using the nematode could be a powerful tool to detect new CDG candidate genes and their associated gene networks.
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Affiliation(s)
- Nanako Kanaki
- Department of Systems Life Sciences, Kyushu University Graduate School, Fukuoka, Japan
| | - Ayako Matsuda
- Department of Systems Life Sciences, Kyushu University Graduate School, Fukuoka, Japan
| | - Katsufumi Dejima
- Department of Biology, Faculty of Sciences, Kyushu University, Fukuoka, Japan.,Department of Physiology, Tokyo Women's Medical University School of Medicine, Tokyo, Japan
| | - Daisuke Murata
- Department of Biology, Faculty of Sciences, Kyushu University, Fukuoka, Japan
| | - Kazuko H Nomura
- Department of Biology, Faculty of Sciences, Kyushu University, Fukuoka, Japan
| | - Takashi Ohkura
- Department of Reproductive Biology, National Research Institute for Child Health and Development, 2-10-1 Okura, Setagaya, Tokyo, Japan
| | - Keiko Gengyo-Ando
- Department of Physiology, Tokyo Women's Medical University School of Medicine, Tokyo, Japan
| | - Sawako Yoshina
- Department of Physiology, Tokyo Women's Medical University School of Medicine, Tokyo, Japan
| | - Shohei Mitani
- Department of Physiology, Tokyo Women's Medical University School of Medicine, Tokyo, Japan
| | - Kazuya Nomura
- Department of Biology, Faculty of Sciences, Kyushu University, Fukuoka, Japan
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80
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Abstract
Signaling pathways that mediate cell-cell communication are essential for collective cell behaviors in multicellular systems. The hedgehog (HH) pathway, first discovered and elucidated in Drosophila, is one of these iconic signaling systems that plays many roles during embryogenesis and in adults; abnormal HH signaling can lead to birth defects and cancer. We review recent structural and biochemical studies that have advanced our understanding of the vertebrate HH pathway, focusing on the mechanisms by which the HH signal is received by patched on target cells, transduced across the cell membrane by smoothened, and transmitted to the nucleus by GLI proteins to influence gene-expression programs.
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Affiliation(s)
- Jennifer H Kong
- Departments of Biochemistry and Medicine, Stanford University School of Medicine, Stanford, CA 94305, USA
| | - Christian Siebold
- Division of Structural Biology, Wellcome Centre for Human Genetics, University of Oxford, Oxford OX3 7BN, UK
| | - Rajat Rohatgi
- Departments of Biochemistry and Medicine, Stanford University School of Medicine, Stanford, CA 94305, USA
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81
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Abramyan J. Hedgehog Signaling and Embryonic Craniofacial Disorders. J Dev Biol 2019; 7:E9. [PMID: 31022843 PMCID: PMC6631594 DOI: 10.3390/jdb7020009] [Citation(s) in RCA: 46] [Impact Index Per Article: 9.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2019] [Revised: 04/18/2019] [Accepted: 04/23/2019] [Indexed: 02/06/2023] Open
Abstract
Since its initial discovery in a Drosophila mutagenesis screen, the Hedgehog pathway has been revealed to be instrumental in the proper development of the vertebrate face. Vertebrates possess three hedgehog paralogs: Sonic hedgehog (Shh), Indian hedgehog (Ihh), and Desert hedgehog (Dhh). Of the three, Shh has the broadest range of functions both in the face and elsewhere in the embryo, while Ihh and Dhh play more limited roles. The Hedgehog pathway is instrumental from the period of prechordal plate formation early in the embryo, until the fusion of the lip and secondary palate, which complete the major patterning events of the face. Disruption of Hedgehog signaling results in an array of developmental disorders in the face, ranging from minor alterations in the distance between the eyes to more serious conditions such as severe clefting of the lip and palate. Despite its critical role, Hedgehog signaling seems to be disrupted through a number of mechanisms that may either be direct, as in mutation of a downstream target of the Hedgehog ligand, or indirect, such as mutation in a ciliary protein that is otherwise seemingly unrelated to the Hedgehog pathway. A number of teratogens such as alcohol, statins and steroidal alkaloids also disrupt key aspects of Hedgehog signal transduction, leading to developmental defects that are similar, if not identical, to those of Hedgehog pathway mutations. The aim of this review is to highlight the variety of roles that Hedgehog signaling plays in developmental disorders of the vertebrate face.
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Affiliation(s)
- John Abramyan
- Department of Natural Sciences, University of Michigan-Dearborn, Dearborn, MI 48128, USA.
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82
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Schilbach-Rott syndrome associated with 9q22.32q22.33 duplication, involving the PTCH1 gene. Eur J Hum Genet 2019; 27:1260-1266. [PMID: 30936464 DOI: 10.1038/s41431-019-0385-6] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2018] [Revised: 03/05/2019] [Accepted: 03/12/2019] [Indexed: 11/08/2022] Open
Abstract
Schilbach-Rott syndrome (SRS, OMIM%164220) is a disorder of unknown aetiology that is characterised by hypotelorism, epichantal folds, cleft palate, dysmorphic face, hypospadia in males and mild mental retardation in some patients. To date, 5 families and 17 patients have exhibited this phenotype, and recurrence in two of these families suggests an autosomal dominant inheritance. SRS overlaps with a mild form of holoprosencephaly (HPE), but array-CGH analysis and sequencing of some HPE-related genes (SEPT9, SHH and TWIST) did not reveal any variants in at least one family. Herein, we investigated by array-CGH analysis a 11-year-old female patient and her father, both exhibiting the typical SRS phenotype, disclosing in the daughter-father couple the same microduplication of chromosome 9q22.32q22.33 [arr[hg19]9q22.32(98,049,611_98,049,636)x3,9q22.33 (99,301,483_99,301,508)x3], involving eight genes, including PTCH1. The duplication segregated with the disease, since it was not found in the healthy paternal grandparents of the proband. The gain-of-function variants of the PTCH1 gene are responsible for a mild form of HPE. This is the first genetic variant found in SRS. This finding reinforces the hypothesis that SRS belongs to the HPE clinical spectrum and suggests to perform array-CGH in patients with SRS phenotype and, if negative, to consider a potential benefit from sequencing of HPE-related genes.
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83
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Raleigh DR, Reiter JF. Misactivation of Hedgehog signaling causes inherited and sporadic cancers. J Clin Invest 2019; 129:465-475. [PMID: 30707108 DOI: 10.1172/jci120850] [Citation(s) in RCA: 61] [Impact Index Per Article: 12.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023] Open
Abstract
The Hedgehog pathway is critical for the development of diverse organs. Misactivation of the Hedgehog pathway can cause developmental abnormalities and cancers, including medulloblastoma, the most common pediatric brain tumor, and basal cell carcinoma, the most common cancer in the United States. Here, we review how basic, translational, and clinical studies of the Hedgehog pathway have helped reveal how cells communicate, how intercellular communication controls development, how signaling goes awry to cause cancer, and how to use targeted molecular agents to treat both inherited and sporadic cancers.
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Affiliation(s)
- David R Raleigh
- Department of Radiation Oncology.,Department of Neurological Surgery, and
| | - Jeremy F Reiter
- Department of Biochemistry and Biophysics, UCSF, San Francisco, California, USA
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84
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Zhang X, Feng L, Qiao N, Liu Y, Zhang DC, Yin H. Cloning, expression pattern and functional characterization of fused, an important kinase of the Hedgehog signalling pathway from Locusta migratoria(Orthoptera: Acridoidea). BIOTECHNOL BIOTEC EQ 2019. [DOI: 10.1080/13102818.2019.1637781] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022] Open
Affiliation(s)
- Xiaohong Zhang
- College of Life Sciences and the Key Laboratory of Zoological Systematics and Application, Hebei University, Baoding, Hebei, P. R. China
| | - Li Feng
- College of Life Sciences and the Key Laboratory of Zoological Systematics and Application, Hebei University, Baoding, Hebei, P. R. China
| | - Ning Qiao
- College of Life Sciences and the Key Laboratory of Zoological Systematics and Application, Hebei University, Baoding, Hebei, P. R. China
| | - Yachao Liu
- College of Life Sciences and the Key Laboratory of Zoological Systematics and Application, Hebei University, Baoding, Hebei, P. R. China
| | - Dao Chuan Zhang
- College of Life Sciences and the Key Laboratory of Zoological Systematics and Application, Hebei University, Baoding, Hebei, P. R. China
| | - Hong Yin
- College of Life Sciences and the Key Laboratory of Zoological Systematics and Application, Hebei University, Baoding, Hebei, P. R. China
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85
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Andrews MG, Kong J, Novitch BG, Butler SJ. New perspectives on the mechanisms establishing the dorsal-ventral axis of the spinal cord. Curr Top Dev Biol 2018; 132:417-450. [PMID: 30797516 DOI: 10.1016/bs.ctdb.2018.12.010] [Citation(s) in RCA: 34] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
Distinct classes of neurons arise at different positions along the dorsal-ventral axis of the spinal cord leading to spinal neurons being segregated along this axis according to their physiological properties and functions. Thus, the neurons associated with motor control are generally located in, or adjacent to, the ventral horn whereas the interneurons (INs) that mediate sensory activities are present within the dorsal horn. Here, we review classic and recent studies examining the developmental mechanisms that establish the dorsal-ventral axis in the embryonic spinal cord. Intriguingly, while the cellular organization of the dorsal and ventral halves of the spinal cord looks superficially similar during early development, the underlying molecular mechanisms that establish dorsal vs ventral patterning are markedly distinct. For example, the ventral spinal cord is patterned by the actions of a single growth factor, sonic hedgehog (Shh) acting as a morphogen, i.e., concentration-dependent signal. Recent studies have shed light on the mechanisms by which the spatial and temporal gradient of Shh is transduced by cells to elicit the generation of different classes of ventral INs, and motor neurons (MNs). In contrast, the dorsal spinal cord is patterned by the action of multiple factors, most notably by members of the bone morphogenetic protein (BMP) and Wnt families. While less is known about dorsal patterning, recent studies have suggested that the BMPs do not act as morphogens to specify dorsal IN identities as previously proposed, rather each BMP has signal-specific activities. Finally, we consider the promise that elucidation of these mechanisms holds for neural repair.
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Affiliation(s)
- Madeline G Andrews
- Department of Neurobiology, University of California, Los Angeles, CA, United States; Neuroscience Graduate Program, University of California, Los Angeles, CA, United States
| | - Jennifer Kong
- Department of Neurobiology, University of California, Los Angeles, CA, United States; Neuroscience Graduate Program, University of California, Los Angeles, CA, United States
| | - Bennett G Novitch
- Department of Neurobiology, University of California, Los Angeles, CA, United States; Eli and Edythe Broad Center of Regenerative Medicine and Stem Cell Research, University of California, Los Angeles, CA, United States
| | - Samantha J Butler
- Department of Neurobiology, University of California, Los Angeles, CA, United States; Eli and Edythe Broad Center of Regenerative Medicine and Stem Cell Research, University of California, Los Angeles, CA, United States.
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86
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Liu A. Proteostasis in the Hedgehog signaling pathway. Semin Cell Dev Biol 2018; 93:153-163. [PMID: 31429406 DOI: 10.1016/j.semcdb.2018.10.009] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2018] [Revised: 10/11/2018] [Accepted: 10/22/2018] [Indexed: 12/29/2022]
Abstract
The Hedgehog (Hh) signaling pathway is crucial for the development of vertebrate and invertebrate animals alike. Hh ligand binds its receptor Patched (Ptc), allowing the activation of the obligate signal transducer Smoothened (Smo). The levels and localizations of both Ptc and Smo are regulated by ubiquitination, and Smo is under additional regulation by phosphorylation and SUMOylation. Downstream of Smo, the Ci/Gli family of transcription factors regulates the transcriptional responses to Hh. Phosphorylation, ubiquitination and SUMOylation are important for the stability and localization of Ci/Gli proteins and Hh signaling output. Finally, Suppressor of Fused directly regulates Ci/Gli proteins and itself is under proteolytic regulation that is critical for normal Hh signaling.
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Affiliation(s)
- Aimin Liu
- Department of Biology, Eberly College of Science, Huck Institute of Life Sciences, The Pennsylvania State University, University Park, PA, 16802, United States.
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87
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Hedgehog Signaling in Cancer: A Prospective Therapeutic Target for Eradicating Cancer Stem Cells. Cells 2018; 7:cells7110208. [PMID: 30423843 PMCID: PMC6262325 DOI: 10.3390/cells7110208] [Citation(s) in RCA: 122] [Impact Index Per Article: 20.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/22/2018] [Revised: 11/03/2018] [Accepted: 11/05/2018] [Indexed: 02/07/2023] Open
Abstract
The Hedgehog (Hh) pathway is a signaling cascade that plays a crucial role in many fundamental processes, including embryonic development and tissue homeostasis. Moreover, emerging evidence has suggested that aberrant activation of Hh is associated with neoplastic transformations, malignant tumors, and drug resistance of a multitude of cancers. At the molecular level, it has been shown that Hh signaling drives the progression of cancers by regulating cancer cell proliferation, malignancy, metastasis, and the expansion of cancer stem cells (CSCs). Thus, a comprehensive understanding of Hh signaling during tumorigenesis and development of chemoresistance is necessary in order to identify potential therapeutic strategies to target various human cancers and their relapse. In this review, we discuss the molecular basis of the Hh signaling pathway and its abnormal activation in several types of human cancers. We also highlight the clinical development of Hh signaling inhibitors for cancer therapy as well as CSC-targeted therapy.
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88
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Gianferante DM, Rotunno M, Dean M, Zhou W, Hicks BD, Wyatt K, Jones K, Wang M, Zhu B, Goldstein AM, Mirabello L. Whole-exome sequencing of nevoid basal cell carcinoma syndrome families and review of Human Gene Mutation Database PTCH1 mutation data. Mol Genet Genomic Med 2018; 6:1168-1180. [PMID: 30411536 PMCID: PMC6305672 DOI: 10.1002/mgg3.498] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2018] [Revised: 09/05/2018] [Accepted: 10/02/2018] [Indexed: 12/22/2022] Open
Abstract
Background Nevoid basal cell carcinoma syndrome (NBCCS) is an autosomal dominant disorder with variable expression and nearly complete penetrance. PTCH1 is the major susceptibility locus and has no known hot spots or genotype–phenotype relationships. Methods We evaluated 18 NBCCS National Cancer Institute (NCI) families plus PTCH1 data on 333 NBCCS disease‐causing mutations (DM) reported in the Human Gene Mutation Database (HGMD). National Cancer Institute families underwent comprehensive genomic evaluation, and clinical data were extracted from NCI and HGMD cases. Genotype–phenotype relationships were analyzed using Fisher's exact tests focusing on mutation type and PTCH1 domains. Results PTCH1 pathogenic mutations were identified in 16 of 18 NCI families, including three previously mutation‐negative families. PTCH1 mutations were spread across the gene with no hot spot. After adjustment for multiple tests, a statistically significant genotype–phenotype association was observed for developmental delay and gross deletion–insertions (p = 9.0 × 10−6), and suggestive associations between falx cerebri calcification and all transmembrane domains (p = 0.002) and severe outcomes and gross deletion–insertions (p = 4.0 × 10−4). Conclusion Overall, 89% of our NCI families had a pathogenic PTCH1 mutation. The identification of PTCH1 mutations in previously mutation‐negative families underscores the importance of repeated testing when new technologies become available. Additional clinical information linked to mutation databases would enhance follow‐up and future studies of genotype–phenotype relationships.
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Affiliation(s)
- D Matthew Gianferante
- Division of Cancer Epidemiology and Genetics, National Cancer Institute, National Institutes of Health, Bethesda, Maryland
| | - Melissa Rotunno
- Division of Cancer Control and Population Science, National Cancer Institute, National Institutes of Health, Bethesda, Maryland
| | - Michael Dean
- Division of Cancer Epidemiology and Genetics, National Cancer Institute, National Institutes of Health, Bethesda, Maryland
| | - Weiyin Zhou
- Cancer Genomics Research Laboratory, Leidos Biomedical Research, Frederick National Laboratory for Cancer Research, Frederick, Maryland
| | - Belynda D Hicks
- Division of Cancer Epidemiology and Genetics, National Cancer Institute, National Institutes of Health, Bethesda, Maryland.,Cancer Genomics Research Laboratory, Leidos Biomedical Research, Frederick National Laboratory for Cancer Research, Frederick, Maryland
| | - Kathleen Wyatt
- Cancer Genomics Research Laboratory, Leidos Biomedical Research, Frederick National Laboratory for Cancer Research, Frederick, Maryland
| | - Kristine Jones
- Division of Cancer Epidemiology and Genetics, National Cancer Institute, National Institutes of Health, Bethesda, Maryland.,Cancer Genomics Research Laboratory, Leidos Biomedical Research, Frederick National Laboratory for Cancer Research, Frederick, Maryland
| | - Mingyi Wang
- Cancer Genomics Research Laboratory, Leidos Biomedical Research, Frederick National Laboratory for Cancer Research, Frederick, Maryland
| | - Bin Zhu
- Cancer Genomics Research Laboratory, Leidos Biomedical Research, Frederick National Laboratory for Cancer Research, Frederick, Maryland
| | - Alisa M Goldstein
- Division of Cancer Epidemiology and Genetics, National Cancer Institute, National Institutes of Health, Bethesda, Maryland
| | - Lisa Mirabello
- Division of Cancer Epidemiology and Genetics, National Cancer Institute, National Institutes of Health, Bethesda, Maryland
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89
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Qi X, Schmiege P, Coutavas E, Li X. Two Patched molecules engage distinct sites on Hedgehog yielding a signaling-competent complex. Science 2018; 362:science.aas8843. [PMID: 30139912 DOI: 10.1126/science.aas8843] [Citation(s) in RCA: 94] [Impact Index Per Article: 15.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2018] [Accepted: 08/15/2018] [Indexed: 12/21/2022]
Abstract
Aberrant Hedgehog (HH) signaling leads to various types of cancer and birth defects. N-terminally palmitoylated HH initiates signaling by binding its receptor Patched-1 (PTCH1). A recent 1:1 PTCH1-HH complex structure visualized a palmitate-mediated binding site on HH, which was inconsistent with previous studies that implied a distinct, calcium-mediated binding site for PTCH1 and HH co-receptors. Our 3.5-angstrom resolution cryo-electron microscopy structure of native Sonic Hedgehog (SHH-N) in complex with PTCH1 at a physiological calcium concentration reconciles these disparate findings and demonstrates that one SHH-N molecule engages both epitopes to bind two PTCH1 receptors in an asymmetric manner. Functional assays using PTCH1 or SHH-N mutants that disrupt the individual interfaces illustrate that simultaneous engagement of both interfaces is required for efficient signaling in cells.
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Affiliation(s)
- Xiaofeng Qi
- Department of Molecular Genetics, University of Texas Southwestern Medical Center, Dallas, TX 75390, USA
| | - Philip Schmiege
- Department of Molecular Genetics, University of Texas Southwestern Medical Center, Dallas, TX 75390, USA
| | - Elias Coutavas
- Laboratory of Cell Biology, The Rockefeller University, New York, NY 10065, USA
| | - Xiaochun Li
- Department of Molecular Genetics, University of Texas Southwestern Medical Center, Dallas, TX 75390, USA. .,Department of Biophysics, University of Texas Southwestern Medical Center, Dallas, TX 75390, USA
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90
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Yabut OR, Pleasure SJ. Sonic Hedgehog Signaling Rises to the Surface: Emerging Roles in Neocortical Development. Brain Plast 2018; 3:119-128. [PMID: 30151337 PMCID: PMC6091060 DOI: 10.3233/bpl-180064] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022] Open
Abstract
The mammalian neocortex is composed of a diverse population of neuronal and glial cells that are crucial for cognition and consciousness. Orchestration of molecular events that lead to the production of distinct cell lineages is now a major research focus. Recent studies in mammalian animal models reveal that Sonic Hedgehog (Shh) signaling plays crucial roles in this process. In this review, we will evaluate these studies and provide insights on how Shh signaling specifically influence cortical development, beyond its established roles in telencephalic patterning, by specifically focusing on its impact on cells derived from the cortical radial glial (RG) cells. We will also assess how these findings further advance our knowledge of neurological diseases and discuss potential roles of targeting Shh signaling in therapies.
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Affiliation(s)
- Odessa R Yabut
- Department of Neurology, University of California San Francisco, San Francisco, CA, USA.,Weill Institute for Neurosciences, University of California San Francisco, San Francisco, CA, USA
| | - Samuel J Pleasure
- Department of Neurology, University of California San Francisco, San Francisco, CA, USA.,Weill Institute for Neurosciences, University of California San Francisco, San Francisco, CA, USA.,Programs in Neuroscience and Developmental Biology, Eli and Edythe Broad Center of Regeneration Medicine and Stem Cell Research, Kavli Institute for Fundamental Neuroscience, University of California San Francisco, CA, USA
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91
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Zhao H, Zhong W, Leng C, Zhang J, Zhang M, Huang W, Zhang Y, Li W, Jia P, Lin J, Maimaitili G, Chen F. A novel PTCH1
mutation underlies nonsyndromic cleft lip and/or palate in a Han Chinese family. Oral Dis 2018; 24:1318-1325. [PMID: 29908092 DOI: 10.1111/odi.12915] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2018] [Revised: 05/25/2018] [Accepted: 06/11/2018] [Indexed: 01/20/2023]
Affiliation(s)
- Huaxiang Zhao
- Department of Orthodontics; Peking University School and Hospital of Stomatology; Beijing China
| | - Wenjie Zhong
- Department of Orthodontics; Peking University School and Hospital of Stomatology; Beijing China
| | - Chuntao Leng
- Department of Stomatology; The Fifth Affiliated Hospital of Xinjiang Medical University; Urumqi China
| | - Jieni Zhang
- Department of Orthodontics; Peking University School and Hospital of Stomatology; Beijing China
| | - Mengqi Zhang
- Department of Orthodontics; Peking University School and Hospital of Stomatology; Beijing China
| | - Wenbin Huang
- Department of Orthodontics; Peking University School and Hospital of Stomatology; Beijing China
| | - Yunfan Zhang
- Department of Orthodontics; Peking University School and Hospital of Stomatology; Beijing China
| | - Weiran Li
- Department of Orthodontics; Peking University School and Hospital of Stomatology; Beijing China
| | - Peizeng Jia
- Department of Orthodontics; Peking University School and Hospital of Stomatology; Beijing China
| | - Jiuxiang Lin
- Department of Orthodontics; Peking University School and Hospital of Stomatology; Beijing China
| | - Gulibaha Maimaitili
- Department of Stomatology; The Fifth Affiliated Hospital of Xinjiang Medical University; Urumqi China
| | - Feng Chen
- Central Laboratory; Peking University School and Hospital of Stomatology; Beijing China
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92
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Gong X, Qian H, Cao P, Zhao X, Zhou Q, Lei J, Yan N. Structural basis for the recognition of Sonic Hedgehog by human Patched1. Science 2018; 361:science.aas8935. [DOI: 10.1126/science.aas8935] [Citation(s) in RCA: 137] [Impact Index Per Article: 22.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/03/2018] [Accepted: 06/19/2018] [Indexed: 12/21/2022]
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93
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Abstract
Purpose Basal cell carcinoma (BCC) is one of the most common skin cancers, and is typically driven by an aberrantly activated Hedgehog (Hh) pathway. The Hh pathway is regulated by interactions between the Patched-1 (Ptch1) and Smoothened (Smo) receptors. Smo is an activating receptor and is subject to inhibition by Ptch1. Following ligand binding to Ptch1, its inhibitory action is relieved and pathway activation occurs. This receptor interaction is pivotal to restraining uncontrolled cellular growth. Both receptors have been found to be frequently mutated in BCCs. Ptch2 is a Ptch1 paralog that exhibits overlapping functions in both normal development and tissue homeostasis. As yet, its contribution to cancer growth is poorly defined. Here we set out to assess how Ptch2 inhibits BCC growth. Methods We used several in vitro readouts for transcriptional and chemotactic Hh signaling in BCC-derived ASZ001 cells, and a novel xenograft model to assess in vivo BCC tumor growth. Gene editing by TALEN was used to untangle the different Ptch2-dependent responses to its ligand sonic hedgehog (Shh). Results We first defined the signaling competence of Ptch2 in Ptch1-deficient ASZ001 cells in vitro, and found that Ptch2 ligand binding drives their migration rather than eliciting a transcriptional response. We found that subsequent targeting of Ptch2 abrogated the chemotaxic effect. Next, we tested the contribution of Ptch2 to in vivo tumor growth using a xenograft model and found that reduced Ptch function results in increased tumor growth, but that selective pressure appatently acts against complete Ptch2 ablation. Conclusions We conclude that like Ptch1, Ptch2 exerts a tumor-suppressive function in BCC cells, and that after targeting of both paralogs, ligand-independent activation of the Hh pathway contributes to tumor growth. Electronic supplementary material The online version of this article (10.1007/s13402-018-0381-9) contains supplementary material, which is available to authorized users.
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94
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Li P, Markson JS, Wang S, Chen S, Vachharajani V, Elowitz MB. Morphogen gradient reconstitution reveals Hedgehog pathway design principles. Science 2018; 360:543-548. [PMID: 29622726 DOI: 10.1126/science.aao0645] [Citation(s) in RCA: 81] [Impact Index Per Article: 13.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2017] [Accepted: 03/22/2018] [Indexed: 12/30/2022]
Abstract
In developing tissues, cells estimate their spatial position by sensing graded concentrations of diffusible signaling proteins called morphogens. Morphogen-sensing pathways exhibit diverse molecular architectures, whose roles in controlling patterning dynamics and precision have been unclear. In this work, combining cell-based in vitro gradient reconstitution, genetic rewiring, and mathematical modeling, we systematically analyzed the distinctive architectural features of the Sonic Hedgehog pathway. We found that the combination of double-negative regulatory logic and negative feedback through the PTCH receptor accelerates gradient formation and improves robustness to variation in the morphogen production rate compared with alternative designs. The ability to isolate morphogen patterning from concurrent developmental processes and to compare the patterning behaviors of alternative, rewired pathway architectures offers a powerful way to understand and engineer multicellular patterning.
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Affiliation(s)
- Pulin Li
- Division of Biology and Biological Engineering, California Institute of Technology, Pasadena, CA 91125, USA
| | - Joseph S Markson
- Division of Biology and Biological Engineering, California Institute of Technology, Pasadena, CA 91125, USA
| | - Sheng Wang
- Division of Biology and Biological Engineering, California Institute of Technology, Pasadena, CA 91125, USA
| | - Siheng Chen
- Division of Biology and Biological Engineering, California Institute of Technology, Pasadena, CA 91125, USA
| | - Vipul Vachharajani
- Division of Biology and Biological Engineering, California Institute of Technology, Pasadena, CA 91125, USA
| | - Michael B Elowitz
- Division of Biology and Biological Engineering, California Institute of Technology, Pasadena, CA 91125, USA. .,Howard Hughes Medical Institute and Department of Applied Physics, California Institute of Technology, Pasadena, CA 91125, USA
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95
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Arensdorf AM, Dillard ME, Menke JM, Frank MW, Rock CO, Ogden SK. Sonic Hedgehog Activates Phospholipase A2 to Enhance Smoothened Ciliary Translocation. Cell Rep 2018; 19:2074-2087. [PMID: 28591579 DOI: 10.1016/j.celrep.2017.05.033] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2016] [Revised: 03/30/2017] [Accepted: 05/09/2017] [Indexed: 12/21/2022] Open
Abstract
The G protein-coupled receptor Smoothened (Smo) is the signal transducer of the Sonic Hedgehog (Shh) pathway. Smo signals through G protein-dependent and -independent routes, with G protein-independent canonical signaling to Gli effectors requiring Smo accumulation in the primary cilium. The mechanisms controlling Smo activation and trafficking are not yet clear but likely entail small-molecule binding to pockets in its extracellular cysteine-rich domain (CRD) and/or transmembrane bundle. Here, we demonstrate that the cytosolic phospholipase cPLA2α is activated through Gβγ downstream of Smo to release arachidonic acid. Arachidonic acid binds Smo and synergizes with CRD-binding agonists, promoting Smo ciliary trafficking and high-level signaling. Chemical or genetic cPLA2α inhibition dampens Smo signaling to Gli, revealing an unexpected contribution of G protein-dependent signaling to canonical pathway activity. Arachidonic acid displaces the Smo transmembrane domain inhibitor cyclopamine to rescue CRD agonist-induced signaling, suggesting that arachidonic acid may target the transmembrane bundle to allosterically enhance signaling by CRD agonist-bound Smo.
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Affiliation(s)
- Angela M Arensdorf
- Department of Cell and Molecular Biology, St. Jude Children's Research Hospital, Memphis, TN 38105, USA
| | - Miriam E Dillard
- Department of Cell and Molecular Biology, St. Jude Children's Research Hospital, Memphis, TN 38105, USA
| | - Jacob M Menke
- Department of Cell and Molecular Biology, St. Jude Children's Research Hospital, Memphis, TN 38105, USA; Rhodes College St. Jude Summer Plus Program, Rhodes College, Memphis, TN 38112, USA
| | - Matthew W Frank
- Department of Infectious Disease, St. Jude Children's Research Hospital, Memphis, TN 38105, USA
| | - Charles O Rock
- Department of Infectious Disease, St. Jude Children's Research Hospital, Memphis, TN 38105, USA
| | - Stacey K Ogden
- Department of Cell and Molecular Biology, St. Jude Children's Research Hospital, Memphis, TN 38105, USA.
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96
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Skoda AM, Simovic D, Karin V, Kardum V, Vranic S, Serman L. The role of the Hedgehog signaling pathway in cancer: A comprehensive review. Bosn J Basic Med Sci 2018; 18:8-20. [PMID: 29274272 DOI: 10.17305/bjbms.2018.2756] [Citation(s) in RCA: 429] [Impact Index Per Article: 71.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2017] [Accepted: 12/01/2017] [Indexed: 12/14/2022] Open
Abstract
The Hedgehog (Hh) signaling pathway was first identified in the common fruit fly. It is a highly conserved evolutionary pathway of signal transmission from the cell membrane to the nucleus. The Hh signaling pathway plays an important role in the embryonic development. It exerts its biological effects through a signaling cascade that culminates in a change of balance between activator and repressor forms of glioma-associated oncogene (Gli) transcription factors. The components of the Hh signaling pathway involved in the signaling transfer to the Gli transcription factors include Hedgehog ligands (Sonic Hh [SHh], Indian Hh [IHh], and Desert Hh [DHh]), Patched receptor (Ptch1, Ptch2), Smoothened receptor (Smo), Suppressor of fused homolog (Sufu), kinesin protein Kif7, protein kinase A (PKA), and cyclic adenosine monophosphate (cAMP). The activator form of Gli travels to the nucleus and stimulates the transcription of the target genes by binding to their promoters. The main target genes of the Hh signaling pathway are PTCH1, PTCH2, and GLI1. Deregulation of the Hh signaling pathway is associated with developmental anomalies and cancer, including Gorlin syndrome, and sporadic cancers, such as basal cell carcinoma, medulloblastoma, pancreatic, breast, colon, ovarian, and small-cell lung carcinomas. The aberrant activation of the Hh signaling pathway is caused by mutations in the related genes (ligand-independent signaling) or by the excessive expression of the Hh signaling molecules (ligand-dependent signaling - autocrine or paracrine). Several Hh signaling pathway inhibitors, such as vismodegib and sonidegib, have been developed for cancer treatment. These drugs are regarded as promising cancer therapies, especially for patients with refractory/advanced cancers.
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Affiliation(s)
- Ana Marija Skoda
- Department of Biology, School of Medicine, University of Zagreb, Zagreb, Croatia.
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97
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Wils LJ, Bijlsma MF. Epigenetic regulation of the Hedgehog and Wnt pathways in cancer. Crit Rev Oncol Hematol 2018; 121:23-44. [DOI: 10.1016/j.critrevonc.2017.11.013] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2017] [Revised: 11/17/2017] [Accepted: 11/17/2017] [Indexed: 12/14/2022] Open
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98
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Bao C, Kramata P, Lee HJ, Suh N. Regulation of Hedgehog Signaling in Cancer by Natural and Dietary Compounds. Mol Nutr Food Res 2017; 62. [PMID: 29164817 DOI: 10.1002/mnfr.201700621] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2017] [Revised: 11/14/2017] [Indexed: 12/12/2022]
Abstract
The aberrant Hedgehog (Hh) signaling induced by mutations or overexpression of the signaling mediators has been implicated in cancer, associated with processes including inflammation, tumor cell growth, invasion, and metastasis, as well as cancer stemness. Small molecules targeting the regulatory components of the Hh signaling pathway, especially Smoothened (Smo), have been developed for the treatment of cancer. However, acquired resistance to a Smo inhibitor vismodegib observed in clinical trials suggests that other Hh signaling components need to be explored as potential anticancer targets. Natural and dietary compounds provide a resource for the development of potent agents affecting intracellular signaling cascades, and numerous studies have been conducted to evaluate the efficacy of natural products in targeting the Hh signaling pathway. In this review, we summarize the role of Hh signaling in tumorigenesis, discuss results from recent studies investigating the effect of natural products and dietary components on Hh signaling in cancer, and provide insight on novel small molecules as potential Hh signaling inhibitors.
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Affiliation(s)
- Cheng Bao
- Department of Food Science and Technology, Chung-Ang University, Anseong, South Korea
| | - Pavel Kramata
- Department of Chemical Biology, Ernest Mario School of Pharmacy, Rutgers, The State University of New Jersey, Piscataway, NJ, USA
| | - Hong Jin Lee
- Department of Food Science and Technology, Chung-Ang University, Anseong, South Korea
| | - Nanjoo Suh
- Department of Chemical Biology, Ernest Mario School of Pharmacy, Rutgers, The State University of New Jersey, Piscataway, NJ, USA.,Rutgers Cancer Institute of New Jersey, New Brunswick, NJ, USA
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99
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Hedgehog mediated degradation of Ihog adhesion proteins modulates cell segregation in Drosophila wing imaginal discs. Nat Commun 2017; 8:1275. [PMID: 29097673 PMCID: PMC5668237 DOI: 10.1038/s41467-017-01364-z] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2016] [Accepted: 09/12/2017] [Indexed: 11/08/2022] Open
Abstract
The Drosophila Hedgehog receptor functions to regulate the essential downstream pathway component, Smoothened, and to limit the range of signaling by sequestering Hedgehog protein signal within imaginal disc epithelium. Hedgehog receptor function requires both Patched and Ihog activity, the latter interchangeably encoded by interference hedgehog (ihog) or brother of ihog (boi). Here we show that Patched and Ihog activity are mutually required for receptor endocytosis and degradation, triggered by Hedgehog protein binding, and causing reduced levels of Ihog/Boi proteins in a stripe of cells at the anterior/posterior compartment boundary of the wing imaginal disc. This Ihog spatial discontinuity may contribute to classically defined cell segregation and lineage restriction at the anterior/posterior wing disc compartment boundary, as suggested by our observations that Ihog activity mediates aggregation of otherwise non-adherent cultured cells and that loss of Ihog activity disrupts wing disc cell segregation, even with downstream genetic rescue of Hedgehog signal response.
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100
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Abstract
The Sonic Hedgehog (Shh) signaling pathway is active during embryonic development in metazoans, and provides instructional cues necessary for proper tissue patterning. The pathway signal transducing component, Smoothened (Smo), is a G protein-coupled receptor (GPCR) that has been demonstrated to signal through at least two effector routes. The first is a G protein–independent canonical route that signals to Gli transcriptional effectors to establish transcriptional programs specifying cell fate during early embryonic development. The second, commonly referred to as the noncanonical Smo signal, induces rapid, transcription-independent responses that are essential for establishing and maintaining distinct cell behaviors during development. Herein, we discuss contributions of this noncanonical route during embryonic development. We also highlight important open questions regarding noncanonical Smo signal route selection during development, and consider implications of noncanonical signal corruption in disease.
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