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Zhang Y, Li X. Immunostaining of Drosophila Brains to Study Optic Lobe Development. Cold Spring Harb Protoc 2024; 2024:108157. [PMID: 37758286 DOI: 10.1101/pdb.prot108157] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/03/2023]
Abstract
The Drosophila optic lobe is a unique system to study neural development. It contains around 200 different types of neurons, which constitute four different neuropils: the lamina, medulla, lobula, and lobula plate. Neural development starts at the larval stage and ends at the pupal stage, resulting in a stereotypical structure at the adult stage. Here, we provide an immunostaining protocol for use on brains from larval, pupal, and adult stages, with a focus on different mounting orientations that can be used to study different aspects of optic lobe development. Images obtained using this protocol illustrate the complex structure of the optic lobe at different stages.
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Affiliation(s)
- Yu Zhang
- Department of Cell and Developmental Biology, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, USA
| | - Xin Li
- Department of Cell and Developmental Biology, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, USA
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2
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Messelodi D, Strocchi S, Bertuccio SN, Baden P, Indio V, Giorgi FM, Taddia A, Serravalle S, Valente S, di Fonzo A, Frattini E, Bernardoni R, Pession A, Grifoni D, Deleidi M, Astolfi A, Pession A. Neuronopathic Gaucher disease models reveal defects in cell growth promoted by Hippo pathway activation. Commun Biol 2023; 6:431. [PMID: 37076591 PMCID: PMC10115838 DOI: 10.1038/s42003-023-04813-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2021] [Accepted: 04/05/2023] [Indexed: 04/21/2023] Open
Abstract
Gaucher Disease (GD), the most common lysosomal disorder, arises from mutations in the GBA1 gene and is characterized by a wide spectrum of phenotypes, ranging from mild hematological and visceral involvement to severe neurological disease. Neuronopathic patients display dramatic neuronal loss and increased neuroinflammation, whose molecular basis are still unclear. Using a combination of Drosophila dGBA1b loss-of-function models and GD patient-derived iPSCs differentiated towards neuronal precursors and mature neurons we showed that different GD- tissues and neuronal cells display an impairment of growth mechanisms with an increased cell death and reduced proliferation. These phenotypes are coupled with the downregulation of several Hippo transcriptional targets, mainly involved in cells and tissue growth, and YAP exclusion from nuclei. Interestingly, Hippo knock-down in the GBA-KO flies rescues the proliferative defect, suggesting that targeting the Hippo pathway can be a promising therapeutic approach to neuronopathic GD.
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Affiliation(s)
- Daria Messelodi
- Department of Medical and Surgical Sciences, University of Bologna, 40138, Bologna, Italy
| | - Silvia Strocchi
- Laboratory of Translational Research, USL-IRCCS of Reggio Emilia, 42123, Reggio Emilia, Italy
| | | | - Pascale Baden
- German Center for Neurodegenerative Diseases (DZNE), Tübingen, 72076, Germany
- Hertie Institut for Clinical Brain Research, University of Tübingen, 72076, Tübingen, Germany
| | - Valentina Indio
- Department of Veterinary Medical Sciences, University of Bologna, 40064, Ozzano dell'Emilia (BO), Italy
| | - Federico M Giorgi
- Department of Pharmacy and Biotechnology, University of Bologna, 40126, Bologna, Italy
| | - Alberto Taddia
- Department of Medical and Surgical Sciences, University of Bologna, 40138, Bologna, Italy
| | - Salvatore Serravalle
- Pediatric Unit, IRCCS Azienda Ospedaliero-Universitaria di Bologna, 40138, Bologna, Italy
| | - Sabrina Valente
- Department of Medical and Surgical Sciences, University of Bologna, 40138, Bologna, Italy
| | - Alessio di Fonzo
- Neurology Unit, Fondazione IRCCS Ca' Granda Ospedale Maggiore Policlinico, 20122, Milan, Italy
| | - Emanuele Frattini
- Neurology Unit, Fondazione IRCCS Ca' Granda Ospedale Maggiore Policlinico, 20122, Milan, Italy
| | - Roberto Bernardoni
- Department of Pharmacy and Biotechnology, University of Bologna, 40126, Bologna, Italy
| | | | - Daniela Grifoni
- Department of Life, Health and Environmental Sciences (MeSVA), University of L'Aquila, 67100, L'Aquila, Italy.
| | - Michela Deleidi
- Hertie Institut for Clinical Brain Research, University of Tübingen, 72076, Tübingen, Germany
- Institut Imagine, INSERM UMR1163, 75015, Paris, France
| | - Annalisa Astolfi
- Department of Medical and Surgical Sciences, University of Bologna, 40138, Bologna, Italy
| | - Andrea Pession
- Pediatric Unit, IRCCS Azienda Ospedaliero-Universitaria di Bologna, 40138, Bologna, Italy
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Hung ST, Llobet Rosell A, Jurriens D, Siemons M, Soloviev O, Kapitein LC, Grußmayer K, Neukomm LJ, Verhaegen M, Smith C. Adaptive optics in single objective inclined light sheet microscopy enables three-dimensional localization microscopy in adult Drosophila brains. Front Neurosci 2022; 16:954949. [PMID: 36278016 PMCID: PMC9583434 DOI: 10.3389/fnins.2022.954949] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/27/2022] [Accepted: 09/01/2022] [Indexed: 11/24/2022] Open
Abstract
Single-molecule localization microscopy (SMLM) enables the high-resolution visualization of organelle structures and the precise localization of individual proteins. However, the expected resolution is not achieved in tissue as the imaging conditions deteriorate. Sample-induced aberrations distort the point spread function (PSF), and high background fluorescence decreases the localization precision. Here, we synergistically combine sensorless adaptive optics (AO), in-situ 3D-PSF calibration, and a single-objective lens inclined light sheet microscope (SOLEIL), termed (AO-SOLEIL), to mitigate deep tissue-induced deteriorations. We apply AO-SOLEIL on several dSTORM samples including brains of adult Drosophila. We observed a 2x improvement in the estimated axial localization precision with respect to widefield without aberration correction while we used synergistic solution. AO-SOLEIL enhances the overall imaging resolution and further facilitates the visualization of sub-cellular structures in tissue.
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Affiliation(s)
- Shih-Te Hung
- Delft Center for Systems and Control, Delft University of Technology, Delft, Netherlands
| | - Arnau Llobet Rosell
- Department of Fundamental Neurosciences, University of Lausanne, Lausanne, Switzerland
| | - Daphne Jurriens
- Cell Biology, Neurobiology and Biophysics, Department of Biology, Faculty of Science, Utrecht University, Utrecht, Netherlands
| | - Marijn Siemons
- Cell Biology, Neurobiology and Biophysics, Department of Biology, Faculty of Science, Utrecht University, Utrecht, Netherlands
| | - Oleg Soloviev
- Delft Center for Systems and Control, Delft University of Technology, Delft, Netherlands
| | - Lukas C. Kapitein
- Cell Biology, Neurobiology and Biophysics, Department of Biology, Faculty of Science, Utrecht University, Utrecht, Netherlands
| | - Kristin Grußmayer
- Department of Bionanoscience, Kavli Institute of Nanoscience Delft, Delft University of Technology, Delft, Netherlands
| | - Lukas J. Neukomm
- Department of Fundamental Neurosciences, University of Lausanne, Lausanne, Switzerland
| | - Michel Verhaegen
- Delft Center for Systems and Control, Delft University of Technology, Delft, Netherlands
| | - Carlas Smith
- Delft Center for Systems and Control, Delft University of Technology, Delft, Netherlands
- Department of Imaging Physics, Delft University of Technology, Delft, Netherlands
- *Correspondence: Carlas Smith
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4
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Rounds JC, Corgiat EB, Ye C, Behnke JA, Kelly SM, Corbett AH, Moberg KH. The disease-associated proteins Drosophila Nab2 and Ataxin-2 interact with shared RNAs and coregulate neuronal morphology. Genetics 2022; 220:iyab175. [PMID: 34791182 PMCID: PMC8733473 DOI: 10.1093/genetics/iyab175] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2021] [Accepted: 09/27/2021] [Indexed: 01/05/2023] Open
Abstract
Nab2 encodes the Drosophila melanogaster member of a conserved family of zinc finger polyadenosine RNA-binding proteins (RBPs) linked to multiple steps in post-transcriptional regulation. Mutation of the Nab2 human ortholog ZC3H14 gives rise to an autosomal recessive intellectual disability but understanding of Nab2/ZC3H14 function in metazoan nervous systems is limited, in part because no comprehensive identification of metazoan Nab2/ZC3H14-associated RNA transcripts has yet been conducted. Moreover, many Nab2/ZC3H14 functional protein partnerships remain unidentified. Here, we present evidence that Nab2 genetically interacts with Ataxin-2 (Atx2), which encodes a neuronal translational regulator, and that these factors coordinately regulate neuronal morphology, circadian behavior, and adult viability. We then present the first high-throughput identifications of Nab2- and Atx2-associated RNAs in Drosophila brain neurons using RNA immunoprecipitation-sequencing (RIP-Seq). Critically, the RNA interactomes of each RBP overlap, and Nab2 exhibits high specificity in its RNA associations in neurons in vivo, associating with a small fraction of all polyadenylated RNAs. The identities of shared associated transcripts (e.g., drk, me31B, stai) and of transcripts specific to Nab2 or Atx2 (e.g., Arpc2 and tea) promise insight into neuronal functions of, and genetic interactions between, each RBP. Consistent with prior biochemical studies, Nab2-associated neuronal RNAs are overrepresented for internal A-rich motifs, suggesting these sequences may partially mediate Nab2 target selection. These data support a model where Nab2 functionally opposes Atx2 in neurons, demonstrate Nab2 shares associated neuronal RNAs with Atx2, and reveal Drosophila Nab2 associates with a more specific subset of polyadenylated mRNAs than its polyadenosine affinity alone may suggest.
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Affiliation(s)
- J Christopher Rounds
- Department of Cell Biology, Emory University School of Medicine, Atlanta, GA 30322, USA
| | - Edwin B Corgiat
- Department of Cell Biology, Emory University School of Medicine, Atlanta, GA 30322, USA
| | - Changtian Ye
- Department of Cell Biology, Emory University School of Medicine, Atlanta, GA 30322, USA
| | - Joseph A Behnke
- Department of Cell Biology, Emory University School of Medicine, Atlanta, GA 30322, USA
| | - Seth M Kelly
- Department of Biology, The College of Wooster, Wooster, OH 44691, USA
| | - Anita H Corbett
- Department of Biology, Emory University, Atlanta, GA 30322, USA
| | - Kenneth H Moberg
- Department of Cell Biology, Emory University School of Medicine, Atlanta, GA 30322, USA
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Robinson W, Godenschwege TA. Live Imaging of Axonal Transport in the Adult Drosophila Central Nervous System. Methods Mol Biol 2022; 2431:417-428. [PMID: 35412290 DOI: 10.1007/978-1-0716-1990-2_22] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/26/2023]
Abstract
Live imaging of axons allows for the determination of motility and directionality of proteins or organelles. In Drosophila, axonal transport has been predominantly characterized in peripheral neurons, such as larval motor neurons and sensory neurons of the adult wing. As peripheral neurons and central nervous system (CNS) neurons are inherently different, we provide a method to live-image axonal transport of CNS neurons in the cervical connective using an upright or inverted microscope. The method involves dissecting and mounting an entire CNS in a glass bottom petri dish, which is suitable for imaging of nearly any axon in cervical connective. Here, we show an example for simultaneous imaging of both giant fiber axons, which are part of the fly's escape response circuitry, and due to their large diameter provide outstanding resolution.
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Affiliation(s)
- Wayne Robinson
- Department of Biological Sciences, Florida Atlantic University, Jupiter, FL, USA
| | - Tanja A Godenschwege
- Department of Biological Sciences, Florida Atlantic University, Jupiter, FL, USA.
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Toh YP, Dion E, Monteiro A. Dissections of Larval, Pupal and Adult Butterfly Brains for Immunostaining and Molecular Analysis. Methods Protoc 2021; 4:53. [PMID: 34449688 PMCID: PMC8395752 DOI: 10.3390/mps4030053] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2021] [Revised: 07/28/2021] [Accepted: 07/31/2021] [Indexed: 11/21/2022] Open
Abstract
Butterflies possess impressive cognitive abilities, and investigations into the neural mechanisms underlying these abilities are increasingly being conducted. Exploring butterfly neurobiology may require the isolation of larval, pupal, and/or adult brains for further molecular and histological experiments. This procedure has been largely described in the fruit fly, but a detailed description of butterfly brain dissections is still lacking. Here, we provide a detailed written and video protocol for the removal of Bicyclus anynana adult, pupal, and larval brains. This species is gradually becoming a popular model because it uses a large set of sensory modalities, displays plastic and hormonally controlled courtship behaviour, and learns visual mate preference and olfactory preferences that can be passed on to its offspring. The extracted brain can be used for downstream analyses, such as immunostaining, DNA or RNA extraction, and the procedure can be easily adapted to other lepidopteran species and life stages.
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Affiliation(s)
- Yi Peng Toh
- Department of Biological Sciences, National University of Singapore, 14 Science Drive 4, Singapore 117543, Singapore; (Y.P.T.); (A.M.)
| | - Emilie Dion
- Department of Biological Sciences, National University of Singapore, 14 Science Drive 4, Singapore 117543, Singapore; (Y.P.T.); (A.M.)
| | - Antónia Monteiro
- Department of Biological Sciences, National University of Singapore, 14 Science Drive 4, Singapore 117543, Singapore; (Y.P.T.); (A.M.)
- Yale-NUS College, 10 College Avenue West, Singapore 138609, Singapore
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Measuring Mitochondrial Hydrogen Peroxide Levels and Glutathione Redox Equilibrium in Drosophila Neuron Subtypes Using Redox-Sensitive Fluorophores and 3D Imaging. Methods Mol Biol 2021. [PMID: 34060036 DOI: 10.1007/978-1-0716-1266-8_8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2023]
Abstract
Disruptions in mitochondrial redox activity are implicated in maladies ranging from those in which cells degenerate to those in which cell division is unregulated. This is not surprising given the pivotal role of mitochondria as ATP producers, reactive oxygen species (ROS) generators, and gatekeepers of apoptosis. While increased ROS are implicated in such a wide variety of disorders, pinpointing the cause of their hyperproduction is challenging. Elevated levels of ROS can result from increases in their production and/or decreases in their turnover. Disruptions in and/or hyperactivity of NADH-ubiquinone oxidoreductase or ubiquinone-cytochrome c oxidoreductase can cause excessive ROS generation. Alternatively, if respiration is functioning in a homeostatic manner, decreases in levels or activity of antioxidants like glutathione, CuZn- and Mn-superoxide dismutase, and catalase could result in excessive ROS. Because of the diversity of disorders in which oxidative damage occurs, the most effective therapeutic strategies may be those that address the putatively diverse causes of increased ROS. Strategies for determining antioxidant activity typically involve semiquantitative measurement of relative protein levels using immunochemistry and mass spectrometry. These methods can be applied to a variety of samples, but they do not lend themselves to detection of cell-specific analyses within tissue like brain.Because we are interested in elucidating the cause of oxidative stress in selectively vulnerable brain neurons, we have taken advantage of the easily manipulatable genetics and high fecundity of the fly. Using a cell type-targeting approach, we have driven redox sensitive green fluorescent proteins (roGFP2 ) into the mitochondria of tyrosine hydroxylase-producing (dopaminergic) neurons. In oxidizing conditions, the fluorophore's maximal excitation wavelength reversibly shifts. Therefore, the relative amount of mitochondrial protein oxidation can be determined by taking the ratio of fluorescence excited with two different lasers. In addition, these GFPs have been independently fused to human glutaredoxin-1 (mito-roGFP2-Grx1) and yeast oxidant receptor peroxidase (mito-roGFP2-Orp1), facilitating measurements of relative mitochondrial glutathione redox potential and H2O2 levels, respectively. In order to obtain a more comprehensive observation of redox states, we capture 3D images of roGFP2 excited by two different lasers. Mito- and cytoplasmic-roGFP2 -Grx1 and -Orp1 expression can be driven by hundreds of genetic drivers in Drosophila , facilitating fixed or living whole organism or tissue- and cell-specific redox measurements.
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Grazioli P, Parodi C, Mariani M, Bottai D, Di Fede E, Zulueta A, Avagliano L, Cereda A, Tenconi R, Wierzba J, Adami R, Iascone M, Ajmone PF, Vaccari T, Gervasini C, Selicorni A, Massa V. Lithium as a possible therapeutic strategy for Cornelia de Lange syndrome. Cell Death Dis 2021; 7:34. [PMID: 33597506 PMCID: PMC7889653 DOI: 10.1038/s41420-021-00414-2] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2020] [Revised: 12/28/2020] [Accepted: 01/17/2021] [Indexed: 01/31/2023]
Abstract
Cornelia de Lange Syndrome (CdLS) is a rare developmental disorder affecting a multitude of organs including the central nervous system, inducing a variable neurodevelopmental delay. CdLS malformations derive from the deregulation of developmental pathways, inclusive of the canonical WNT pathway. We have evaluated MRI anomalies and behavioral and neurological clinical manifestations in CdLS patients. Importantly, we observed in our cohort a significant association between behavioral disturbance and structural abnormalities in brain structures of hindbrain embryonic origin. Considering the cumulative evidence on the cohesin-WNT-hindbrain shaping cascade, we have explored possible ameliorative effects of chemical activation of the canonical WNT pathway with lithium chloride in different models: (I) Drosophila melanogaster CdLS model showing a significant rescue of mushroom bodies morphology in the adult flies; (II) mouse neural stem cells restoring physiological levels in proliferation rate and differentiation capabilities toward the neuronal lineage; (III) lymphoblastoid cell lines from CdLS patients and healthy donors restoring cellular proliferation rate and inducing the expression of CyclinD1. This work supports a role for WNT-pathway regulation of CdLS brain and behavioral abnormalities and a consistent phenotype rescue by lithium in experimental models.
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Affiliation(s)
- Paolo Grazioli
- grid.4708.b0000 0004 1757 2822Department of Health Sciences, Università degli Studi di Milano, Milan, Italy
| | - Chiara Parodi
- grid.4708.b0000 0004 1757 2822Department of Health Sciences, Università degli Studi di Milano, Milan, Italy
| | | | - Daniele Bottai
- grid.4708.b0000 0004 1757 2822Department of Health Sciences, Università degli Studi di Milano, Milan, Italy ,grid.4708.b0000 0004 1757 2822“Aldo Ravelli” Center for Neurotechnology and Experimental Brain Therapeutics, Università degli Studi di Milano, Milan, Italy
| | - Elisabetta Di Fede
- grid.4708.b0000 0004 1757 2822Department of Health Sciences, Università degli Studi di Milano, Milan, Italy
| | - Aida Zulueta
- grid.4708.b0000 0004 1757 2822Department of Health Sciences, Università degli Studi di Milano, Milan, Italy
| | - Laura Avagliano
- grid.4708.b0000 0004 1757 2822Department of Health Sciences, Università degli Studi di Milano, Milan, Italy
| | - Anna Cereda
- Department of Pediatrics-ASST Papa Giovanni XXIII, Bergamo, Italy
| | - Romano Tenconi
- grid.5608.b0000 0004 1757 3470Department of Pediatrics, University of Padova, Padova, Italy
| | - Jolanta Wierzba
- grid.11451.300000 0001 0531 3426Department of Pediatrics and Internal Medicine Nursing, Department of Rare Disorders, Medical University of Gdansk, Gdańsk, Poland
| | - Raffaella Adami
- grid.4708.b0000 0004 1757 2822Department of Health Sciences, Università degli Studi di Milano, Milan, Italy
| | - Maria Iascone
- Department of Pediatrics-ASST Papa Giovanni XXIII, Bergamo, Italy
| | - Paola Francesca Ajmone
- grid.414818.00000 0004 1757 8749Child and Adolescent Neuropsychiatric Unit, Fondazione IRCCS Cà Granda Ospedale Maggiore Policlinico, Milan, Italy
| | - Thomas Vaccari
- grid.4708.b0000 0004 1757 2822Department of Biosciences, Università degli Studi di Milano, Milano, Italy
| | - Cristina Gervasini
- grid.4708.b0000 0004 1757 2822Department of Health Sciences, Università degli Studi di Milano, Milan, Italy ,grid.4708.b0000 0004 1757 2822“Aldo Ravelli” Center for Neurotechnology and Experimental Brain Therapeutics, Università degli Studi di Milano, Milan, Italy
| | | | - Valentina Massa
- grid.4708.b0000 0004 1757 2822Department of Health Sciences, Università degli Studi di Milano, Milan, Italy ,grid.4708.b0000 0004 1757 2822“Aldo Ravelli” Center for Neurotechnology and Experimental Brain Therapeutics, Università degli Studi di Milano, Milan, Italy
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Hua Y, Ma C, Huang S, Wang R, Chen J, Guo Q, Zhou J, Zhu H, Li W. Toxic effects of formaldehyde and the protective effect of docosahexaenoic acid in Drosophila. Transl Neurosci 2021; 12:351-361. [PMID: 34703626 PMCID: PMC8491587 DOI: 10.1515/tnsci-2020-0186] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/21/2021] [Revised: 08/31/2021] [Accepted: 09/06/2021] [Indexed: 12/14/2022] Open
Abstract
Formaldehyde (FA) is a commercially important chemical applied in industry and scientific research. However, FA has a distinct impact on learning and memory. Although the mechanisms of FA toxicity have been well studied, additional research is required to establish the mechanisms of neuroprotection in cases of FA exposure. Docosahexaenoic acid (DHA) is a polyunsaturated fatty acid with a variety of health benefits, including the enhancement of learning and memory. In this study, we investigated the neuroprotective effects of DHA in Drosophila melanogaster that had ingested FA. Our data suggested that DHA enhanced reproductive processes, leading to an increase in the number of eggs, larvae, and adults. Surprisingly, we found that DHA had a mild protective effect against FA-induced impairments in learning and memory.
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Affiliation(s)
- Yanli Hua
- Department of Human Anatomy, Medical College of Soochow University, 199 Ren-Ai Road, Suzhou 215123, PR China
| | - Chao Ma
- Department of Human Anatomy, Medical College of Soochow University, 199 Ren-Ai Road, Suzhou 215123, PR China
| | - Shuyi Huang
- Department of Human Anatomy, Medical College of Soochow University, 199 Ren-Ai Road, Suzhou 215123, PR China
| | - Ruomeng Wang
- Department of Human Anatomy, Medical College of Soochow University, 199 Ren-Ai Road, Suzhou 215123, PR China
| | - Jian Chen
- Department of Human Anatomy, Medical College of Soochow University, 199 Ren-Ai Road, Suzhou 215123, PR China
| | - Qing Guo
- Department of Human Anatomy, Medical College of Soochow University, 199 Ren-Ai Road, Suzhou 215123, PR China
| | - Jiaojiao Zhou
- Department of Human Anatomy, Medical College of Soochow University, 199 Ren-Ai Road, Suzhou 215123, PR China
| | - Hemin Zhu
- Department of Human Anatomy, Medical College of Soochow University, 199 Ren-Ai Road, Suzhou 215123, PR China
| | - Wenjie Li
- Department of Human Anatomy, Medical College of Soochow University, 199 Ren-Ai Road, Suzhou 215123, PR China
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Lysosomal Hydrolase Cathepsin D Non-proteolytically Modulates Dendritic Morphology in Drosophila. Neurosci Bull 2020; 36:1147-1157. [PMID: 32170568 PMCID: PMC7532236 DOI: 10.1007/s12264-020-00479-6] [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: 11/14/2019] [Accepted: 12/19/2019] [Indexed: 01/09/2023] Open
Abstract
The main lysosomal protease cathepsin D (cathD) is essential for maintaining tissue homeostasis via its degradative function, and its loss leads to ceroid accumulation in the mammalian nervous system, which results in progressive neurodegeneration. Increasing evidence implies non-proteolytic roles of cathD in regulating various biological processes such as apoptosis, cell proliferation, and migration. Along these lines, we here showed that cathD is required for modulating dendritic architecture in the nervous system independent of its traditional degradative function. Upon cathD depletion, class I and class III arborization (da) neurons in Drosophila larvae exhibited aberrant dendritic morphology, including over-branching, aberrant turning, and elongation defects. Re-introduction of wild-type cathD or its proteolytically-inactive mutant dramatically abolished these morphological defects. Moreover, cathD knockdown also led to dendritic defects in the adult mushroom bodies, suggesting that cathD-mediated processes are required in both the peripheral and central nervous systems. Taken together, our results demonstrate a critical role of cathD in shaping dendritic architecture independent of its proteolytic function.
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