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Cells
Special Issues
Unconventional Protein Secretion in Development and Disease
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Unconventional Protein Secretion in Development and Disease

A special issue of Cells (ISSN 2073-4409).

Deadline for manuscript submissions: closed (1 June 2019) | Viewed by 33387

Special Issue Editor

Dr. Bor Luen Tang

E-Mail Website
Guest Editor
Department of Biochemistry, Yong Loo Lin School of Medicine, National University of Singapore, Singapore, Singapore
Interests: membrane trafficking; neuronal death and regeneration; SIRT1 and aging
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

The constitutive or regulated secretory pathway characterized by vesicular traffic from the endoplasmic reticulum, through the Golgi apparatus and towards the plasma membrane has been long recognized for all eukaryotic cells. However, an increasing number of proteins are also found to be secreted in an unconventional manner, in modes that are insensitive to inhibitors of conventional exocytosis and/or use a routes that bypasses the Golgi apparatus. Prominent examples of these include the fibroblast growth factor 2 (FGF2) and interleukin-1β (IL-1β), and even membrane proteins such as integrin-alpha and the cystic fibrosis transmembrane conductor (CFTR). Unconventional secretion may be important for cellular homeostasis as well as waste clearance and in some instances secreted proteins are known to play roles in intercellular signalling. Cellular mechanisms underlying the multiple modes of unconventional protein secretion range from a recently deciphered form of plasma membrane translocation to processes involving the generation of secretory autophagosomes, secretory lysosomes, ectosomes, exosomes and other extracellular microvesicles. The mechanisms underlying processes are not yet fully known or understood and this is an active area of study in cell biology.

Importantly, unconventional protein secretion has been shown to play important roles during development, such as in the secretion of the transcription factor Engrailed and the cell adhesion molecule integrin-α. Unconventional secretion of pathological factors such as α-Synuclein, Tau, Huntingtin, TDP-43 and Superoxide dismutase 1 (SOD1) likely play significant roles in the pathological spread of important neurodegenerative diseases. Unconventional secretion is important for immune modulation and contributes to cancer cell/tissue secretomes. These unconventionally secreted proteins could have therefore have oncogenic roles and may be useful cancer biomarkers.

In this special issue of Cells, we invite your contributions, either in the form of original research articles, reviews, or shorter “Perspective” articles on all aspects related to the theme of “Unconventional Protein Secretion in Development and Disease”. Articles with mechanistic and functional insights from a cell and molecular biological perspective are particularly welcome. Relevant topics include, but are not limited to

  • Unconventional secretion of specific cargo molecules in mammalian and plant cells
  • Mechanisms of unconventional secretion in eukaryotes
  • Unconventional secretion during embryonic development
  • Unconventional secretion in immune function and diseases
  • Unconventional secretion in cancer
  • Unconventional secretion in neurodegenerative diseases
Assoc. Prof. Bor Luen Tang
Guest Editor

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Cells is an international peer-reviewed open access semimonthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2700 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • α-Synuclein
  • autophagy
  • FGF2
  • IL-1β
  • microvesicles
  • Tau
  • unconventional secretion

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Published Papers (5 papers)

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Editorial

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3 pages, 175 KiB  
Editorial
Trafficking Unconventionally via UPS
by Bor Luen Tang
Cells 2020, 9(9), 2009; https://doi.org/10.3390/cells9092009 - 1 Sep 2020
Viewed by 1949
Abstract
Conventional protein secretion in eukaryotic cells occurs via vesicular trafficking of proteins that are first targeted to the endoplasmic reticulum (ER), through the Golgi apparatus, and subsequently routed to the plasma membrane (PM), where membrane proteins take up residence while luminal proteins are [...] Read more.
Conventional protein secretion in eukaryotic cells occurs via vesicular trafficking of proteins that are first targeted to the endoplasmic reticulum (ER), through the Golgi apparatus, and subsequently routed to the plasma membrane (PM), where membrane proteins take up residence while luminal proteins are released extracellularly [...] Full article
(This article belongs to the Special Issue Unconventional Protein Secretion in Development and Disease)

Research

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22 pages, 3157 KiB  
Article
Folding Status Is Determinant over Traffic-Competence in Defining CFTR Interactors in the Endoplasmic Reticulum
by João D. Santos, Sara Canato, Ana S. Carvalho, Hugo M. Botelho, Kerman Aloria, Margarida D. Amaral, Rune Matthiesen, Andre O. Falcao and Carlos M. Farinha
Cells 2019, 8(4), 353; https://doi.org/10.3390/cells8040353 - 14 Apr 2019
Cited by 23 | Viewed by 4714
Abstract
The most common cystic fibrosis-causing mutation (F508del, present in ~85% of CF patients) leads to CFTR misfolding, which is recognized by the endoplasmic reticulum (ER) quality control (ERQC), resulting in ER retention and early degradation. It is known that CFTR exit from the [...] Read more.
The most common cystic fibrosis-causing mutation (F508del, present in ~85% of CF patients) leads to CFTR misfolding, which is recognized by the endoplasmic reticulum (ER) quality control (ERQC), resulting in ER retention and early degradation. It is known that CFTR exit from the ER is mediated by specific retention/sorting signals that include four arginine-framed tripeptide (AFT) retention motifs and a diacidic (DAD) exit code that controls the interaction with the COPII machinery. Here, we aim at obtaining a global view of the protein interactors that regulate CFTR exit from the ER. We used mass spectrometry-based interaction proteomics and bioinformatics analyses to identify and characterize proteins interacting with selected CFTR peptide motifs or full-length CFTR variants retained or bypassing these ERQC checkpoints. We conclude that these ERQC trafficking checkpoints rely on fundamental players in the secretory pathway, detecting key components of the protein folding machinery associated with the AFT recognition and of the trafficking machinery recognizing the diacidic code. Furthermore, a greater similarity in terms of interacting proteins is observed for variants sharing the same folding defect over those reaching the same cellular location, evidencing that folding status is dominant over ER escape in shaping the CFTR interactome. Full article
(This article belongs to the Special Issue Unconventional Protein Secretion in Development and Disease)
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Review

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14 pages, 972 KiB  
Review
The Roles of Endo-Lysosomes in Unconventional Protein Secretion
by Juhyung Lee and Yihong Ye
Cells 2018, 7(11), 198; https://doi.org/10.3390/cells7110198 - 3 Nov 2018
Cited by 27 | Viewed by 10601
Abstract
Protein secretion in general depends on signal sequence (also named leader sequence), a hydrophobic segment located at or close to the NH2-terminus of a secretory or membrane protein. This sequence guides the entry of nascent polypeptides into the lumen or membranes of the [...] Read more.
Protein secretion in general depends on signal sequence (also named leader sequence), a hydrophobic segment located at or close to the NH2-terminus of a secretory or membrane protein. This sequence guides the entry of nascent polypeptides into the lumen or membranes of the endoplasmic reticulum (ER) for folding, assembly, and export. However, evidence accumulated in recent years has suggested the existence of a collection of unconventional protein secretion (UPS) mechanisms that are independent of the canonical vesicular trafficking route between the ER and the plasma membrane (PM). These UPS mechanisms export soluble proteins bearing no signal sequence. The list of UPS cargos is rapidly expanding, along with the implicated biological functions, but molecular mechanisms accountable for the secretion of leaderless proteins are still poorly defined. This review summarizes our current understanding of UPS mechanisms with an emphasis on the emerging role of endo-lysosomes in this process. Full article
(This article belongs to the Special Issue Unconventional Protein Secretion in Development and Disease)
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14 pages, 560 KiB  
Review
Evaluation of Unconventional Protein Secretion by Saccharomyces cerevisiae and other Fungi
by Natsuko Miura and Mitsuyoshi Ueda
Cells 2018, 7(9), 128; https://doi.org/10.3390/cells7090128 - 31 Aug 2018
Cited by 45 | Viewed by 8055
Abstract
Development of proteome analysis of extracellular proteins has revealed that a wide variety of proteins, including fungal allergens are present outside the cell. These secreted allergens often do not contain known secretion signal sequences. Recent research progress shows that some fungal allergens are [...] Read more.
Development of proteome analysis of extracellular proteins has revealed that a wide variety of proteins, including fungal allergens are present outside the cell. These secreted allergens often do not contain known secretion signal sequences. Recent research progress shows that some fungal allergens are secreted by unconventional secretion pathways, including autophagy- and extracellular-vesicle-dependent pathways. However, secretion pathways remain unknown for the majority of extracellular proteins. This review summarizes recent data on unconventional protein secretion in Saccharomyces cerevisiae and other fungi. Particularly, methods for evaluating unconventional protein secretion are proposed for fungal species, including S. cerevisiae, a popular model organism for investigating protein secretion pathways. Full article
(This article belongs to the Special Issue Unconventional Protein Secretion in Development and Disease)
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16 pages, 754 KiB  
Review
Unconventional Secretion and Intercellular Transfer of Mutant Huntingtin
by Bor Luen Tang
Cells 2018, 7(6), 59; https://doi.org/10.3390/cells7060059 - 14 Jun 2018
Cited by 22 | Viewed by 6418
Abstract
The mechanism of intercellular transmission of pathological agents in neurodegenerative diseases has received much recent attention. Huntington’s disease (HD) is caused by a monogenic mutation in the gene encoding Huntingtin (HTT). Mutant HTT (mHTT) harbors a CAG repeat extension which encodes an abnormally [...] Read more.
The mechanism of intercellular transmission of pathological agents in neurodegenerative diseases has received much recent attention. Huntington’s disease (HD) is caused by a monogenic mutation in the gene encoding Huntingtin (HTT). Mutant HTT (mHTT) harbors a CAG repeat extension which encodes an abnormally long polyglutamine (polyQ) repeat at HTT’s N-terminus. Neuronal pathology in HD is largely due to the toxic gain-of-function by mHTT and its proteolytic products, which forms both nuclear and cytoplasmic aggregates that perturb nuclear gene transcription, RNA splicing and transport as well cellular membrane dynamics. The neuropathological effects of mHTT have been conventionally thought to be cell-autonomous in nature. Recent findings have, however, indicated that mHTT could be secreted by neurons, or transmitted from one neuronal cell to another via different modes of unconventional secretion, as well as via tunneling nanotubes (TNTs). These modes of transmission allow the intercellular spread of mHTT and its aggregates, thus plausibly promoting neuropathology within proximal neuronal populations and between neurons that are connected within neural circuits. Here, the various possible modes for mHTT’s neuronal cell exit and intercellular transmission are discussed. Full article
(This article belongs to the Special Issue Unconventional Protein Secretion in Development and Disease)
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