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The Role of Proteases and Protease Inhibitors in the Immune System

A special issue of International Journal of Molecular Sciences (ISSN 1422-0067). This special issue belongs to the section "Molecular Immunology".

Deadline for manuscript submissions: closed (20 October 2024) | Viewed by 4135

Special Issue Editor


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Guest Editor
Department of Cell and Molecular Biology, Uppsala University BMC, Box 596, SE-751 24 Uppsala, Sweden
Interests: mast cells; basophilic leukocytes, neutrophilic leukocytes; serine proteases; cleavage specificity; phage display; IgE; evolution; allergy; vaccines; Fc receptors; dermatitis; cytokines; immune regulation
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Special Issue Information

Dear Colleagues,

Proteases and protease inhibitors are key players in a large number of processes involved in immunity and also in the evasion of the immune system by infectious organisms. Proteases of cytotoxic T cells and natural killer cells (NK-cells) induce apoptosis in target cells via cleavage and, as a result, the activation of another set of proteases, the caspases. Mast cells use proteases to regulate blood pressure via angiotensin cleavage. They also use proteases to regulate types of immunity by cleaving selective sets of cytokines to combat blood-feeding parasites such as mosquitos and ticks via the cleavage of anti-coagulant proteins and toxins from snakes and scorpions to reduce toxicity. Neutrophil proteases help these cells to migrate through tissues to reach the site of infection and cleave the pathogen-associated molecules of the infectious organisms to defend against these intruders. Proteases are also key players in both the complement and the coagulation systems, which both are tightly connected to immunity and inflammation. Some of these proteases are very active and have a relatively broad specificity; thus, they have many potential targets. Conversely, others are highly specific, with only one or a few selected targets.

The activity of these sometimes very potent proteases needs to be controlled, and to a large extent protease inhibitors are responsible for this. If left uncontrolled, some of them can cause severe negative effects, as exemplified by the excessive activity of neutrophil elastase in the case of low plasma levels regarding the protease inhibitor alpha-1-antitrypsin. These patients experience severe lung emphysema. Although a lot is known about these proteases and protease inhibitors, some aspects associated with them are very much still unknown. This Special Issue will try to address some of the important outstanding questions regarding the proteases and protease inhibitors involved in immunity.

Prof. Dr. Lars Hellman
Guest Editor

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Keywords

  • serine protease
  • cleavage specificity
  • mast cell
  • neutrophilic granulocyte
  • cytotoxic T cell
  • NK cell
  • immune regulation
  • toxin
  • tissue homeostasis
  • angiotensin
  • cytokines
  • complement system
  • coagulation system

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Published Papers (3 papers)

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Research

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20 pages, 11985 KiB  
Article
Extended Cleavage Specificity of two Hematopoietic Serine Proteases from a Ray-Finned Fish, the Spotted Gar (Lepisosteus oculatus)
by Paolo Valentini, Srinivas Akula, Abigail Alvarado-Vazquez, Jenny Hallgren, Zhirong Fu, Brett Racicot, Ingo Braasch, Michael Thorpe and Lars Hellman
Int. J. Mol. Sci. 2024, 25(3), 1669; https://doi.org/10.3390/ijms25031669 - 30 Jan 2024
Cited by 1 | Viewed by 1383
Abstract
The extended cleavage specificities of two hematopoietic serine proteases originating from the ray-finned fish, the spotted gar (Lepisosteus oculatus), have been characterized using substrate phage display. The preference for particular amino acids at and surrounding the cleavage site was further validated [...] Read more.
The extended cleavage specificities of two hematopoietic serine proteases originating from the ray-finned fish, the spotted gar (Lepisosteus oculatus), have been characterized using substrate phage display. The preference for particular amino acids at and surrounding the cleavage site was further validated using a panel of recombinant substrates. For one of the enzymes, the gar granzyme G, a strict preference for the aromatic amino acid Tyr was observed at the cleavable P1 position. Using a set of recombinant substrates showed that the gar granzyme G had a high selectivity for Tyr but a lower activity for cleaving after Phe but not after Trp. Instead, the second enzyme, gar DDN1, showed a high preference for Leu in the P1 position of substrates. This latter enzyme also showed a high preference for Pro in the P2 position and Arg in both P4 and P5 positions. The selectivity for the two Arg residues in positions P4 and P5 suggests a highly specific substrate selectivity of this enzyme. The screening of the gar proteome with the consensus sequences obtained by substrate phage display for these two proteases resulted in a very diverse set of potential targets. Due to this diversity, a clear candidate for a specific immune function of these two enzymes cannot yet be identified. Antisera developed against the recombinant gar enzymes were used to study their tissue distribution. Tissue sections from juvenile fish showed the expression of both proteases in cells in Peyer’s patch-like structures in the intestinal region, indicating they may be expressed in T or NK cells. However, due to the lack of antibodies to specific surface markers in the gar, it has not been possible to specify the exact cellular origin. A marked difference in abundance was observed for the two proteases where gar DDN1 was expressed at higher levels than gar granzyme G. However, both appear to be expressed in the same or similar cells, having a lymphocyte-like appearance. Full article
(This article belongs to the Special Issue The Role of Proteases and Protease Inhibitors in the Immune System)
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18 pages, 7357 KiB  
Article
The Extended Cleavage Specificity of Channel Catfish Granzyme-like II, A Highly Specific Elastase, Expressed by Natural Killer-like Cells
by Michael Thorpe, Srinivas Akula, Zhirong Fu and Lars Hellman
Int. J. Mol. Sci. 2024, 25(1), 356; https://doi.org/10.3390/ijms25010356 - 26 Dec 2023
Cited by 2 | Viewed by 1036
Abstract
The extended cleavage specificity of catfish granzyme-like II has been characterized using substrate phage display. The preference for particular amino acids at and surrounding the cleavage site was further validated by using a panel of recombinant substrates. This serine protease, which has previously [...] Read more.
The extended cleavage specificity of catfish granzyme-like II has been characterized using substrate phage display. The preference for particular amino acids at and surrounding the cleavage site was further validated by using a panel of recombinant substrates. This serine protease, which has previously been isolated as cDNA from a catfish natural killer-like cell line showed a preference for Ala in the P1 position of the substrate, and for multiple basic amino acids N-terminally of the cleavage site. A closely related zebrafish serine protease (zebrafish esterase-like) showed a very similar cleavage specificity, indicating an evolutionary conservation of this protease specificity among various fish species. Two catfish serine proteases, originating from NK-like cells, have now been isolated and characterized. One of them is highly specific met-ase with similar characteristics as the mammalian granzyme M. This enzyme may be involved in the induction of apoptosis in virus-infected cells, with a potential target in (catfish) caspase 6. In contrast to catfish granzyme-like I, the second enzyme analyzed here does not seem to have a direct counterpart in mammalian NK cells, and its role in the immune function of catfish NK cells is, therefore, still not known. However, this enzyme seems to be able to cleave a number of cytoskeletal proteins, indicating a separate strategy to induce apoptosis in target cells. Both of these enzymes are very interesting targets for further studies of their roles in catfish immunity, as enzymes with similar specificities have also been identified in zebrafish. Full article
(This article belongs to the Special Issue The Role of Proteases and Protease Inhibitors in the Immune System)
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Review

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17 pages, 2670 KiB  
Review
Evolution of Caspases and the Invention of Pyroptosis
by Betsaida Bibo-Verdugo and Guy Salvesen
Int. J. Mol. Sci. 2024, 25(10), 5270; https://doi.org/10.3390/ijms25105270 - 12 May 2024
Cited by 1 | Viewed by 1181
Abstract
The protein scaffold that includes the caspases is ancient and found in all domains of life. However, the stringent specificity that defines the caspase biologic function is relatively recent and found only in multicellular animals. During the radiation of the Chordata, members of [...] Read more.
The protein scaffold that includes the caspases is ancient and found in all domains of life. However, the stringent specificity that defines the caspase biologic function is relatively recent and found only in multicellular animals. During the radiation of the Chordata, members of the caspase family adopted roles in immunity, events coinciding with the development of substrates that define the modern innate immune response. This review focuses on the switch from the non-inflammatory cellular demise of apoptosis to the highly inflammatory innate response driven by distinct members of the caspase family, and the interplay between these two regulated cell death pathways. Full article
(This article belongs to the Special Issue The Role of Proteases and Protease Inhibitors in the Immune System)
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