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Kuijper EC, Overzier M, Suidgeest E, Dzyubachyk O, Maguin C, Pérot JB, Flament J, Ariyurek Y, Mei H, Buijsen RAM, van der Weerd L, van Roon-Mom W. Antisense oligonucleotide-mediated disruption of HTT caspase-6 cleavage site ameliorates the phenotype of YAC128 Huntington disease mice. Neurobiol Dis 2024; 190:106368. [PMID: 38040383 DOI: 10.1016/j.nbd.2023.106368] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2023] [Revised: 11/20/2023] [Accepted: 11/28/2023] [Indexed: 12/03/2023] Open
Abstract
In Huntington disease, cellular toxicity is particularly caused by toxic protein fragments generated from the mutant huntingtin (HTT) protein. By modifying the HTT protein, we aim to reduce proteolytic cleavage and ameliorate the consequences of mutant HTT without lowering total HTT levels. To that end, we use an antisense oligonucleotide (AON) that targets HTT pre-mRNA and induces partial skipping of exon 12, which contains the critical caspase-6 cleavage site. Here, we show that AON-treatment can partially restore the phenotype of YAC128 mice, a mouse model expressing the full-length human HTT gene including 128 CAG-repeats. Wild-type and YAC128 mice were treated intracerebroventricularly with AON12.1, scrambled AON or vehicle starting at 6 months of age and followed up to 12 months of age, when MRI was performed and mice were sacrificed. AON12.1 treatment induced around 40% exon skip and protein modification. The phenotype on body weight and activity, but not rotarod, was restored by AON treatment. Genes differentially expressed in YAC128 striatum changed toward wild-type levels and striatal volume was preserved upon AON12.1 treatment. However, scrambled AON also showed a restorative effect on gene expression and appeared to generally increase brain volume.
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Affiliation(s)
- Elsa C Kuijper
- Department of Human Genetics, Leiden University Medical Center, the Netherlands.
| | - Maurice Overzier
- Department of Human Genetics, Leiden University Medical Center, the Netherlands
| | - Ernst Suidgeest
- Department of Radiology, Leiden University Medical Center, the Netherlands
| | - Oleh Dzyubachyk
- Department of Radiology, Leiden University Medical Center, the Netherlands
| | - Cécile Maguin
- Université Paris-Saclay, Commissariat à l'Energie Atomique et aux Energies Alternatives, Centre National de la Recherche Scientifique, Molecular Imaging Research Center, Laboratoire des Maladies Neurodégénératives, France
| | - Jean-Baptiste Pérot
- Université Paris-Saclay, Commissariat à l'Energie Atomique et aux Energies Alternatives, Centre National de la Recherche Scientifique, Molecular Imaging Research Center, Laboratoire des Maladies Neurodégénératives, France; Institut du Cerveau - Paris Brain Institute, Sorbonne Université, France
| | - Julien Flament
- Université Paris-Saclay, Commissariat à l'Energie Atomique et aux Energies Alternatives, Centre National de la Recherche Scientifique, Molecular Imaging Research Center, Laboratoire des Maladies Neurodégénératives, France
| | - Yavuz Ariyurek
- Department of Human Genetics, Leiden University Medical Center, the Netherlands
| | - Hailiang Mei
- Department of Biomedical Data Sciences, Leiden University Medical Center, the Netherlands
| | - Ronald A M Buijsen
- Department of Human Genetics, Leiden University Medical Center, the Netherlands
| | - Louise van der Weerd
- Department of Human Genetics, Leiden University Medical Center, the Netherlands; Department of Radiology, Leiden University Medical Center, the Netherlands
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Huang S, Mei H, Lu L, Kuang Z, Heng Y, Xu L, Liang X, Qiu M, Pan X. Conformational transitions of caspase-6 in substrate-induced activation process explored by perturbation-response scanning combined with targeted molecular dynamics. Comput Struct Biotechnol J 2021; 19:4156-4164. [PMID: 34527189 PMCID: PMC8342898 DOI: 10.1016/j.csbj.2021.07.017] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2021] [Revised: 07/17/2021] [Accepted: 07/23/2021] [Indexed: 11/23/2022] Open
Abstract
Caspase-6 participates in a series of neurodegenerative pathways, and has aroused widespread attentions as a promising molecular target for the treatment of neurodegeneration. Caspase-6 is a homodimer with 6 central-stranded β-sheets and 5 α-helices in each monomer. Previous crystallographic studies suggested that the 60′s, 90′s and 130′s helices of caspase-6 undergo a distinctive conformational transition upon substrate binding. Although the caspase-6 structures in apo and active states have been determined, the conformational transition process between the two states remains poorly understood. In this work, perturbation-response scanning (PRS) combined with targeted molecular dynamics (TMD) simulations was employed to unravel the atomistic mechanism of the dynamic conformational transitions underlying the substrate-induced activation process of caspase-6. The results showed that the conformational transition of caspase-6 from apo to active states is mainly characterized by structural rearrangements of the substrate-binding site as well as the conformational changes of 60′s and 130′s extended helices. The H-bond interactions between L1, 130′s helix and 90′s helix are proved to be key determinant factors for substrate-induced conformational transition. These findings provide valuable insights into the activation mechanism of caspase-6 as well as the molecular design of caspase-6 inhibitors.
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Affiliation(s)
- Shuheng Huang
- Key Laboratory of Biorheological Science and Technology (Ministry of Education), College of Bioengineering, Chongqing University, Chongqing 400045, China
| | - Hu Mei
- Key Laboratory of Biorheological Science and Technology (Ministry of Education), College of Bioengineering, Chongqing University, Chongqing 400045, China
| | - Laichun Lu
- Key Laboratory of Biorheological Science and Technology (Ministry of Education), College of Bioengineering, Chongqing University, Chongqing 400045, China
| | - Zuyin Kuang
- Key Laboratory of Biorheological Science and Technology (Ministry of Education), College of Bioengineering, Chongqing University, Chongqing 400045, China
| | - Yu Heng
- Key Laboratory of Biorheological Science and Technology (Ministry of Education), College of Bioengineering, Chongqing University, Chongqing 400045, China
| | - Lei Xu
- Key Laboratory of Biorheological Science and Technology (Ministry of Education), College of Bioengineering, Chongqing University, Chongqing 400045, China
| | - Xiaoqi Liang
- Key Laboratory of Biorheological Science and Technology (Ministry of Education), College of Bioengineering, Chongqing University, Chongqing 400045, China
| | - Minyao Qiu
- Key Laboratory of Biorheological Science and Technology (Ministry of Education), College of Bioengineering, Chongqing University, Chongqing 400045, China
| | - Xianchao Pan
- Department of Medicinal Chemistry, College of Pharmacy, Southwest Medical University, Luzhou, Sichuan 646000, China
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Harnett KG, Chin A, Schuh SM. BPA and BPA alternatives BPS, BPAF, and TMBPF, induce cytotoxicity and apoptosis in rat and human stem cells. Ecotoxicol Environ Saf 2021; 216:112210. [PMID: 33866271 DOI: 10.1016/j.ecoenv.2021.112210] [Citation(s) in RCA: 40] [Impact Index Per Article: 13.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/11/2020] [Revised: 03/22/2021] [Accepted: 03/29/2021] [Indexed: 05/25/2023]
Abstract
Bisphenol A (BPA) is a ubiquitous industrial chemical found in everyday plastic products and materials. Due to scientific findings on the reproductive, developmental, and cellular defects caused by BPA and heightened public awareness, manufacturers have begun to use new chemicals in place of BPA in "BPA-free" products. These alternatives are chemical analogs of BPA and include dozens of new compounds that have undergone relatively little testing and oversight, including: bisphenol S (BPS), bisphenol AF (BPAF), and the recently developed tetramethyl bisphenol F (TMBPF; the monomer of valPure V70). Here, we used adult female rat adipose-derived stem cells (rASCs) and human mesenchymal stem cells (hMSCs) to compare the toxicities and potencies of these BPA alternatives in vitro. Rat and human stem cells were exposed to BPA (1-10 μM), 17β-estradiol (E2; 10 μM), BPS (1-100 μM), BPAF (3×10-4-30 μM), TMBPF (0.01-50 μM), or control media alone (with 0.01% ethanol) for varying time intervals from 10 min to 24 h. We found significantly decreased cell viability and massive apoptosis in rat and human stem cells treated with each BPA analog, as early as 10 min of exposure, and at low, physiologically relevant doses. BPAF showed extreme cytotoxicity in a dose-dependent manner (LC50 =0.014 μM (rASCs) and 0.009 μM (hMSCs)), whereas TMBPF showed a bimodal response, with low and high concentrations being the most toxic (LC50 =0.88 μM (rASCs) and 0.06 μM (hMSCs)). Activated caspase-6 levels increased in nearly all cells treated with the BPA analogs indicating the majority of cell death was due to caspase-6-mediated apoptosis. These results in both rat and human stem cells underscore the toxicity and potency of these BPA analogs, and establish a rank order of potency of: BPAF>TMBPF>BPA>BPS. Further, these and other recent findings indicate that these newer BPA analogs may be 'regrettable substitutions,' being worse than the original parent compound and lacking proper testing and regulation. This work brings to light the need for further toxicological characterization, better regulation, greater public awareness, and the development of safer, more sustainable chemicals and non-plastic products.
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Affiliation(s)
- Kristen G Harnett
- Saint Mary's College of California, Department of Biology, Moraga, CA, USA
| | - Ashley Chin
- Saint Mary's College of California, Department of Biology, Moraga, CA, USA
| | - Sonya M Schuh
- Saint Mary's College of California, Department of Biology, Moraga, CA, USA.
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Islam MI, Hossain MS, Park IS. Differential involvement of caspase-6 in amyloid-β-induced fragmentation of lamin A and B. Biochem Biophys Rep 2020; 24:100839. [PMID: 33145443 PMCID: PMC7591731 DOI: 10.1016/j.bbrep.2020.100839] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2020] [Revised: 10/12/2020] [Accepted: 10/22/2020] [Indexed: 01/01/2023] Open
Abstract
Amyloid-β (Aβ), a peptide implicated in Alzheimer's disease, was shown to cause specific fragmentation of lamin proteins, which was mediated by an unidentified protease named nuclear scaffold protease (NSP) independently of caspase-6. Because caspase-6 is responsible for the fragmentation process in many other damage-induced apoptosis, here we further investigated possible involvement of caspase-6 in Aβ-induced lamin fragmentation under various conditions. We found that lamin A fragment generated by NSP (named fragment b) disappeared in cells incubated with Aβ42 for prolonged periods and this product was preserved by a caspase-6 inhibitor. Furthermore, caspase-6 could remove fragment b in nuclei isolated from Aβ42-treated cells (ANU). Lamin B in ANU was fragmented by caspase-6 only after treatment with an alkaline phosphatase. The caspase-mediated fragmentation of lamin B was also achieved with nuclei isolated from cells incubated with Aβ42 plus a Cdk5 inhibitor. The results indicate that Aβ42 induces NSP-mediated fragmentation of lamin A and the following removal process of fragment b by caspase-6 and an Aβ-induced phosphorylation prevents the fragmentation of lamin B by caspase-6. The pathway leading to lamin protein fragmentation in this investigation appears to be specific for Aβ and thus the data will provide novel insights into the toxicity of the peptide. Aβ42 induces nuclear scaffold protease (NSP)-mediated fragmentation of lamin A. The produced fragment of lamin A is subsequently removed by caspase-6. Aβ42 also induced NSP-mediated lamin B fragmentation. Caspase-6-mediated fragmentation of lamin B protein is absent. The absence appears to be due to phosphorylation of lamin B.
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Affiliation(s)
| | | | - Il-Seon Park
- Department of Medical Sciences, Republic of Korea.,Department of Cellular and Molecular Medicine, Chosun University, Gwanju, 501-759, Republic of Korea
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Kumi RO, Agoni C, Issahaku AR, Olotu FA, Soliman MES. 'Polymorphism-aided' Selective Targeting and Inhibition of Caspase-6 by a Novel Allosteric Inhibitor Towards Efficient Alzheimer's Disease Treatment. Cell Biochem Biophys 2020; 78:291-9. [PMID: 32592127 DOI: 10.1007/s12013-020-00927-0] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/31/2019] [Accepted: 06/17/2020] [Indexed: 10/23/2022]
Abstract
The predominance of Alzheimer's disease (AD) among the aged remains a global challenge. As such, the search for alternative and effective therapeutic options continuous unabated. Among the therapeutic targets explored over the years toward impeding the progression of AD is caspase-6 (Casp6), although selectively targeting Casp6 remains a challenge due to high homology with other members of the caspase family. Methyl 3-[(2,3-dihydro-1-benzofuran-2-yl formamido) methyl]-5-(furan-2-amido) benzoate (C13), a novel allosteric inhibitor, is reportedly shown to exhibit selective inhibition against mutant human Casp6 variants (E35K). However, structural and atomistic insights accounting for the reported inhibitory prowess of C13 remains unresolved. In this study, we seek to unravel the mechanistic selectivity of C13 coupled with the complementary effects of E35K single-nucleotide polymorphism (SNP) relative to Casp6 inhibition. Analyses of binding dynamics revealed that the variant Lysine-35 mediated consistent high-affinity interactions with C13 at the allosteric site, possibly forming the molecular basis of the selectivity of C13 as well as its high binding free energy as estimated. Analysis of residue interaction network around Glu35 and Lys35 revealed prominent residue network distortions in the mutant Casp6 conformation evidenced by a decrease in node degree, reduced number of edges and an increase short in path length relative to a more compact conformation in the wild system. The relatively higher binding free energy of C13 coupled with the stronger intermolecular interactions elicited in the mutant conformation further suggests that the mutation E35K probably favours the inhibitory activity of C13. Further analysis of atomistic changes showed increased C-α atom deviations consistent with structural disorientations in the mutant Casp6. Structural Insights provided could open up a novel paradigm of structure-based design of selective allosteric inhibition of Casp6 towards the treatment of neurodegenerative diseases.
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Gao C, Dang S, Zhai J, Zheng S. Regulatory mechanism of microRNA-155 in chicken embryo fibroblasts in response to reticuloendotheliosis virus infection. Vet Microbiol 2020; 242:108610. [PMID: 32122614 DOI: 10.1016/j.vetmic.2020.108610] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2019] [Revised: 02/09/2020] [Accepted: 02/09/2020] [Indexed: 01/17/2023]
Abstract
Reticuloendotheliosis virus (REV) infection of multiple avian species can lead to a number of diseases such as runting syndrome, immunosuppression and oncogenesis, causing major economic losses. MicroRNAs play important roles in post-transcriptional regulation, effectively inhibiting protein synthesis, and participating in many biological processes in cells, including proliferation, differentiation, apoptosis, lipometabolism, virus infection and replication, and tumorigenesis. Based on our previous high-throughput sequencing results, we explore the regulatory mechanisms of microRNA-155(miR-155) in chicken embryo fibroblasts (CEFs) in response to REV infection. Our results revealed expression of miR-155 in CEFs after REV infection upregulated in a time- and dose-dependent manner, indicating miR-155 plays a role in REV infection in CEFs indeed. After transfected with miR-155-mimic and miR-155-inhibitor, we found overexpression of miR-155 targeted caspase-6 and FOXO3a to inhibit apoptosis and accelerate cell cycle, thus improving viability of REV-infected CEFs. This result also verified the protective role of miR-155 in the viability of CEFs in the presence of REV. Knockdown of miR-155 also supported these above conclusions. Our findings uncover a new mechanism of REV pathogenesis in CEFs, and also provide a theoretical basis for uncovering new effective treatment and prevention methods for RE based on miR-155.
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Affiliation(s)
- Chang Gao
- Heilongjiang Key Laboratory for Laboratory Animals and Comparative Medicine, College of Veterinary Medicine, Northeast Agricultural University, NO. 59 Mucai Street, Harbin 150030, People's Republic of China.
| | - Shengyuan Dang
- Heilongjiang Key Laboratory for Laboratory Animals and Comparative Medicine, College of Veterinary Medicine, Northeast Agricultural University, NO. 59 Mucai Street, Harbin 150030, People's Republic of China.
| | - Jie Zhai
- Heilongjiang Key Laboratory for Laboratory Animals and Comparative Medicine, College of Veterinary Medicine, Northeast Agricultural University, NO. 59 Mucai Street, Harbin 150030, People's Republic of China.
| | - Shimin Zheng
- Heilongjiang Key Laboratory for Laboratory Animals and Comparative Medicine, College of Veterinary Medicine, Northeast Agricultural University, NO. 59 Mucai Street, Harbin 150030, People's Republic of China.
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7
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Nie ZY, Yao M, Yang Z, Yang L, Liu XJ, Yu J, Ma Y, Zhang N, Zhang XY, Liu MH, Jiang LL, Luo JM. De-regulated STAT5A/miR-202-5p/USP15/ Caspase-6 regulatory axis suppresses CML cell apoptosis and contributes to Imatinib resistance. J Exp Clin Cancer Res 2020; 39:17. [PMID: 31952546 PMCID: PMC6969434 DOI: 10.1186/s13046-019-1502-7] [Citation(s) in RCA: 25] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/08/2019] [Accepted: 12/12/2019] [Indexed: 12/16/2022]
Abstract
BACKGROUND STAT5 plays an important role in the transformation of hematopoietic cells by BCR-ABL. However, the downstream target genes activated by STAT5 in chronic myeloid leukemia (CML) cells remain largely unclear. Here, we investigated the mechanistic functional relationship between STAT5A-regulated microRNA and CML cell apoptosis. METHODS The expression of USP15, Caspase-6, STAT5A-regulated miR-202-5p and STAT5A was detected by qRT-PCR and Western blotting in CML cell lines and PBMCs of CML patients. Cell apoptosis was evaluated by flow cytometry. Both gain- and loss-of-function experiments were used to investigate the roles of USP15, miR-202-5p and STAT5A in CML. Luciferase reporter assay detected the effect of miR-202-5p on USP15 expression. Xenograft animal model was used to test the effect of anti-miR-202-5p and pimozide on K562 cell xenograft growth. RESULTS USP15 expression was significantly downregulated in CML cell lines and PBMCs of CML patients. Depletion of USP15 increased, whereas overexpression of USP15 reduced the resistance of CML cells to Imatinib. Further, decreased deubiquitinating activity of USP15 by USP15 downregulation led to reduced caspase-6 level, thus attenuating CML cell apoptosis. Mechanistically, miR-202-5p was upregulated in K562G cells and negatively regulated USP15 expression by directly targeting USP15 3'-UTR. Correspondingly, upregulation of miR-202-5p enhanced the resistance of CML cells to Imatinib by inhibiting cell apoptosis. Importantly, STAT5A was upregulated in CML cells and directly activated miR-202-5p transcription by binding to the pre-miR-202 promoter. Pimozide induced CML cell apoptosis and significantly reduced K562 cell xenograft growth in vivo by blocking STAT5A/miR-202-5p/USP15/Caspase-6 regulatory axis. CONCLUSIONS we provide the first evidence that de-regulated STAT5A/miR-202-5p/USP15/Caspase-6 regulatory axis suppresses the apoptosis of CML cells, targeting this pathway might be a promising therapeutic approach for the treatment of CML.
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Affiliation(s)
- Zi-Yuan Nie
- Department of Hematology, The Second Hospital of Hebei Medical University, 215 Heping W Rd, Shijiazhuang, 050000, China
| | - Min Yao
- Department of Biochemistry and Molecular Biology, The Key Laboratory of Neural and Vascular Biology, Ministry of Education of China, Hebei Medical University, No. 361 Zhongshan E Rd, Shijiazhuang, 050017, China
| | - Zhan Yang
- Department of Biochemistry and Molecular Biology, The Key Laboratory of Neural and Vascular Biology, Ministry of Education of China, Hebei Medical University, No. 361 Zhongshan E Rd, Shijiazhuang, 050017, China.,Department of Urology, The Second Hospital of Hebei Medical University, 215 Heping W Rd, Shijiazhuang, 050000, China
| | - Lin Yang
- Department of Hematology, The Second Hospital of Hebei Medical University, 215 Heping W Rd, Shijiazhuang, 050000, China
| | - Xiao-Jun Liu
- Department of Hematology, The Second Hospital of Hebei Medical University, 215 Heping W Rd, Shijiazhuang, 050000, China
| | - Jing Yu
- Department of Biochemistry and Molecular Biology, The Key Laboratory of Neural and Vascular Biology, Ministry of Education of China, Hebei Medical University, No. 361 Zhongshan E Rd, Shijiazhuang, 050017, China
| | - Ying Ma
- Department of Biochemistry and Molecular Biology, The Key Laboratory of Neural and Vascular Biology, Ministry of Education of China, Hebei Medical University, No. 361 Zhongshan E Rd, Shijiazhuang, 050017, China
| | - Nan Zhang
- Department of Biochemistry and Molecular Biology, The Key Laboratory of Neural and Vascular Biology, Ministry of Education of China, Hebei Medical University, No. 361 Zhongshan E Rd, Shijiazhuang, 050017, China
| | - Xiao-Yan Zhang
- Department of Hematology, The Second Hospital of Hebei Medical University, 215 Heping W Rd, Shijiazhuang, 050000, China
| | - Meng-Han Liu
- Department of Hematology, The Second Hospital of Hebei Medical University, 215 Heping W Rd, Shijiazhuang, 050000, China
| | - Ling-Ling Jiang
- Department of Biochemistry and Molecular Biology, The Key Laboratory of Neural and Vascular Biology, Ministry of Education of China, Hebei Medical University, No. 361 Zhongshan E Rd, Shijiazhuang, 050017, China.
| | - Jian-Min Luo
- Department of Hematology, The Second Hospital of Hebei Medical University, 215 Heping W Rd, Shijiazhuang, 050000, China.
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Zheng M, Kanneganti TD. Newly Identified Function of Caspase-6 in ZBP1-mediated Innate Immune Responses, NLRP3 Inflammasome Activation, PANoptosis, and Host Defense. J Cell Immunol 2020; 2:341-347. [PMID: 33426542 PMCID: PMC7793005 DOI: 10.33696/immunology.2.064] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Abstract
Caspase-6 was discovered decades ago, but its roles in biological processes remain largely unknown. Recently, we have demonstrated that caspase-6 plays a critical role in influenza A virus (IAV)-induced cell death and innate immune responses. During IAV infection, Z-DNA binding protein 1 (ZBP1) initiates ZBP1-PANoptosome assembly to drive inflammasome activation and cell death, and we showed that caspase-6 interacts with RIPK3 to enhance the interaction between RIPK3 and ZBP1, thus promoting PANoptosome assembly. Moreover, the caspase activity of caspase-6 is not required for tins process, suggesting a caspase-independent function of caspase-6 during IAV infection. Additionally, we found that caspase-6 is required for the alternative activation of alveolar macrophages in response to IAV infection. Our findings provide an opportunity to reconsider the physiological role of caspase-6.
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Affiliation(s)
- Min Zheng
- Department of Immunology, St. Jude Children’s Research Hospital, Memphis, TN, 38105, USA
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9
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Zhou L, Flores J, Noël A, Beauchet O, Sjöström PJ, LeBlanc AC. Methylene blue inhibits Caspase-6 activity, and reverses Caspase-6-induced cognitive impairment and neuroinflammation in aged mice. Acta Neuropathol Commun 2019; 7:210. [PMID: 31843022 PMCID: PMC6915996 DOI: 10.1186/s40478-019-0856-6] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2019] [Accepted: 11/25/2019] [Indexed: 12/20/2022] Open
Abstract
Activated Caspase-6 (Casp6) is associated with age-dependent cognitive impairment and Alzheimer disease (AD). Mice expressing human Caspase-6 in hippocampal CA1 neurons develop age-dependent cognitive deficits, neurodegeneration and neuroinflammation. This study assessed if methylene blue (MB), a phenothiazine that inhibits caspases, alters Caspase-6-induced neurodegeneration and cognitive impairment in mice. Aged cognitively impaired Casp6-overexpressing mice were treated with methylene blue in drinking water for 1 month. Methylene blue treatment did not alter Caspase-6 levels, assessed by RT-PCR, western blot and immunohistochemistry, but inhibited fluorescently-labelled Caspase-6 activity in acute brain slice intact neurons. Methylene blue treatment rescued Caspase-6-induced episodic and spatial memory deficits measured by novel object recognition and Barnes maze, respectively. Methylene blue improved synaptic function of hippocampal CA1 neurons since theta-burst long-term potentiation (LTP), measured by field excitatory postsynaptic potentials (fEPSPs) in acute brain slices, was successfully induced in the Schaffer collateral-CA1 pathway in methylene blue-treated, but not in vehicle-treated, Caspase-6 mice. Increased neuroinflammation, measured by ionized calcium binding adaptor molecule 1 (Iba1)-positive microglia numbers and subtypes, and glial fibrillary acidic protein (GFAP)-positive astrocytes, were decreased by methylene blue treatment. Therefore, methylene blue reverses Caspase-6-induced cognitive deficits by inhibiting Caspase-6, and Caspase-6-mediated neurodegeneration and neuroinflammation. Our results indicate that Caspase-6-mediated damage is reversible months after the onset of cognitive deficits and suggest that methylene blue could benefit Alzheimer disease patients by reversing Caspase-6-mediated cognitive decline.
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Affiliation(s)
- Libin Zhou
- Lady Davis Institute for Medical Research at Jewish General Hospital, 3999 Ch. Côte Ste-Catherine, Montreal, QC H3T 1E2 Canada
- Department of Anatomy and Cell Biology, McGill University, 3640 University Street Strathcona Anatomy Building, Montreal, QC H3A 0C7 Canada
| | - Joseph Flores
- Lady Davis Institute for Medical Research at Jewish General Hospital, 3999 Ch. Côte Ste-Catherine, Montreal, QC H3T 1E2 Canada
| | - Anastasia Noël
- Lady Davis Institute for Medical Research at Jewish General Hospital, 3999 Ch. Côte Ste-Catherine, Montreal, QC H3T 1E2 Canada
| | - Olivier Beauchet
- Lady Davis Institute for Medical Research at Jewish General Hospital, 3999 Ch. Côte Ste-Catherine, Montreal, QC H3T 1E2 Canada
- Department of Medicine, Division of Geriatric Medicine, Sir Mortimer B. Davis - Jewish General Hospital, 3999 Ch. Côte Ste-Catherine, Montreal, QC H3T 1E2 Canada
- Lee Kong Chian School of Medicine, Nanyang Technological University, Singapore, Singapore
| | - P. Jesper Sjöström
- Centre for Research in Neuroscience, the BRaIN Program, Department of Neurology and Neurosurgery, McGill University, The Research Institute of the McGill University Health Centre, Montreal General Hospital, 1650 Cedar Avenue, Montreal, QC H3G 1A4 Canada
| | - Andrea C. LeBlanc
- Lady Davis Institute for Medical Research at Jewish General Hospital, 3999 Ch. Côte Ste-Catherine, Montreal, QC H3T 1E2 Canada
- Department of Anatomy and Cell Biology, McGill University, 3640 University Street Strathcona Anatomy Building, Montreal, QC H3A 0C7 Canada
- Department of Neurology and Neurosurgery, McGill University, 845 Sherbrooke O, Montreal, QC H3A 0G4 Canada
- Bloomfield Center for Research in Aging, Lady Davis Institute for Medical Research, Sir Mortimer B Davis Jewish General Hospital, 3755 ch. Côte Ste-Catherine, Montréal, QC H3T 1E2 Canada
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10
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Yan A, Ren C, Chen T, Huo D, Jiang X, Sun H, Hu C. A novel caspase-6 from sea cucumber Holothuria leucospilota: Molecular characterization, expression analysis and apoptosis detection. Fish Shellfish Immunol 2018; 80:232-240. [PMID: 29890217 DOI: 10.1016/j.fsi.2018.06.006] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/19/2018] [Revised: 06/05/2018] [Accepted: 06/06/2018] [Indexed: 06/08/2023]
Abstract
In this study, a novel caspase-6 named HLcaspase-6 was identified from sea cucumber Holothuria leucospilota. The full-length cDNA of HLcaspase-6 is 2195 bp in size, containing a 126 bp 5'-untranslated region (UTR), a 1043 bp 3'-UTR and a 1026 bp open reading frame (ORF) encoding a protein of 341 amino acids with a deduced molecular weight of 38.57 kDa. HLcaspase-6 contains the common signatures of the caspase family, including the conserved pentapeptide motif QACRG, as well as the P20 and P10 domains. In addition, HLcaspase-6 contains a short pro-domain. HLcaspase-6 mRNA is ubiquitously expressed in all tissues examined, with the highest transcript level in the intestine, followed by coelomocytes. In in vitro experiments, the expression of HLcaspase-6 mRNA in coelomocytes was significantly up-regulated by lipopolysaccharides (LPS) or polyriboinosinic-polyribocytidylic acid [poly (I:C)] challenge, suggesting that HLcaspase-6 might play important roles in the innate immune defense of sea cucumber against bacterial and viral infections. Moreover, we further confirmed that overexpression of HLcaspase-6 could induce apoptosis and activate the p53 signal pathway.
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Affiliation(s)
- Aifen Yan
- School of Stomatology and Medicine, Foshan University, Foshan 528000, China.
| | - Chunhua Ren
- CAS Key Laboratory of Tropical Marine Bio-resources and Ecology (LMB); Guangdong Provincial Key Laboratory of Applied Marine Biology (LAMB), South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou, 510301, China; South China Sea Bio-Resource Exploitation and Utilization Collaborative Innovation Center, China.
| | - Ting Chen
- CAS Key Laboratory of Tropical Marine Bio-resources and Ecology (LMB); Guangdong Provincial Key Laboratory of Applied Marine Biology (LAMB), South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou, 510301, China; South China Sea Bio-Resource Exploitation and Utilization Collaborative Innovation Center, China.
| | - Da Huo
- CAS Key Laboratory of Tropical Marine Bio-resources and Ecology (LMB); Guangdong Provincial Key Laboratory of Applied Marine Biology (LAMB), South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou, 510301, China.
| | - Xiao Jiang
- CAS Key Laboratory of Tropical Marine Bio-resources and Ecology (LMB); Guangdong Provincial Key Laboratory of Applied Marine Biology (LAMB), South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou, 510301, China.
| | - Hongyan Sun
- College of Marine Sciences, South China Agricultural University, Guangzhou, 510642, China.
| | - Chaoqun Hu
- CAS Key Laboratory of Tropical Marine Bio-resources and Ecology (LMB); Guangdong Provincial Key Laboratory of Applied Marine Biology (LAMB), South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou, 510301, China; South China Sea Bio-Resource Exploitation and Utilization Collaborative Innovation Center, China.
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11
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Pakavathkumar P, Noël A, Lecrux C, Tubeleviciute-Aydin A, Hamel E, Ahlfors JE, LeBlanc AC. Caspase vinyl sulfone small molecule inhibitors prevent axonal degeneration in human neurons and reverse cognitive impairment in Caspase-6-overexpressing mice. Mol Neurodegener 2017; 12:22. [PMID: 28241839 PMCID: PMC5329948 DOI: 10.1186/s13024-017-0166-z] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2016] [Accepted: 02/22/2017] [Indexed: 02/05/2023] Open
Abstract
BACKGROUND The activation of the aspartate-specific cysteinyl protease, Caspase-6, is proposed as an early pathogenic event of Alzheimer disease (AD) and Huntington's disease. Caspase-6 inhibitors could be useful against these neurodegenerative diseases but most Caspase-6 inhibitors have been exclusively studied in vitro or show acute liver toxicity in humans. Here, we assessed vinyl sulfone small molecule peptide caspase inhibitors for potential use in vivo. METHODS The IC50 of NWL vinyl sulfone small molecule caspase inhibitors were determined on Caspase-1 to 10, and Caspase-6-transfected human colon carcinoma HCT116 cells. Inhibition of Caspase-6-mediated axonal degeneration was assessed in serum-deprived or amyloid precursor protein-transfected primary human CNS neurons. Cellular toxicity was measured by phase contrast microscopy, mitochondrial and lactate dehydrogenase colorimetric activity assays, or flow cytometry. Caspase inhibition was measured by fluorogenic activity assays, fluorescence microscopy, and western blot analyses. The effect of inhibitors on age-dependent cognitive deficits in Caspase-6 transgenic mice was assessed by the novel object recognition task. Liquid chromatography coupled to tandem mass spectrometry assessed the blood-brain barrier permeability of inhibitors in Caspase-6 mice. RESULTS Vinyl sulfone NWL-117 caspase inhibitor has a higher selectivity against Caspase-6, -4, -8, -9, and -10 whereas NWL-154 has higher selectivity against Caspase-6, -8, and -10. The half-maximal inhibitory concentrations (IC50) of NWL-117 and NWL-154 is 192 nM and 100 nM against Caspase-6 in vitro, and 4.82 μM and 3.63 μM in Caspase-6-transfected HCT116 cells, respectively. NWL inhibitors are not toxic to HCT116 cells or to human primary neurons. NWL-117 and NWL-154 inhibit serum deprivation-induced Caspase-6 activity and prevent amyloid precursor protein-mediated neurite degeneration in human primary CNS neurons. NWL-117 crosses the blood brain barrier and reverses age-dependent episodic memory deficits in Caspase-6 mice. CONCLUSIONS NWL peptidic vinyl methyl sulfone inhibitors are potent, non-toxic, blood-brain barrier permeable, and irreversible caspase inhibitors with neuroprotective effects in HCT116 cells, in primary human CNS neurons, and in Caspase-6 mice. These results highlight the therapeutic potential of vinyl sulfone inhibitors as caspase inhibitors against neurodegenerative diseases and sanction additional work to improve their selectivity against different caspases.
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Affiliation(s)
- Prateep Pakavathkumar
- Bloomfield Center for Research in Aging, Lady Davis Institute for Medical Research, Jewish General Hospital, 3999 Ch. Cote Ste-Catherine, Montreal, QC, H3T 1E2, Canada
- Department of Neurology and Neurosurgery, McGill University, 845 Sherbrooke O, Montreal, QC, H3A 0G4, Canada
| | - Anastasia Noël
- Bloomfield Center for Research in Aging, Lady Davis Institute for Medical Research, Jewish General Hospital, 3999 Ch. Cote Ste-Catherine, Montreal, QC, H3T 1E2, Canada
- Department of Neurology and Neurosurgery, McGill University, 845 Sherbrooke O, Montreal, QC, H3A 0G4, Canada
| | - Clotilde Lecrux
- Laboratory of Cerebrovascular Research, Montreal Neurological Institute, 3801 University Street, Montreal, QC, H3A 2B4, Canada
| | - Agne Tubeleviciute-Aydin
- Bloomfield Center for Research in Aging, Lady Davis Institute for Medical Research, Jewish General Hospital, 3999 Ch. Cote Ste-Catherine, Montreal, QC, H3T 1E2, Canada
- Department of Neurology and Neurosurgery, McGill University, 845 Sherbrooke O, Montreal, QC, H3A 0G4, Canada
| | - Edith Hamel
- Laboratory of Cerebrovascular Research, Montreal Neurological Institute, 3801 University Street, Montreal, QC, H3A 2B4, Canada
| | - Jan-Eric Ahlfors
- New World Laboratories, 500 Boulevard Cartier Ouest, Laval, QC, H7V 5B7, Canada
| | - Andrea C LeBlanc
- Bloomfield Center for Research in Aging, Lady Davis Institute for Medical Research, Jewish General Hospital, 3999 Ch. Cote Ste-Catherine, Montreal, QC, H3T 1E2, Canada.
- Department of Neurology and Neurosurgery, McGill University, 845 Sherbrooke O, Montreal, QC, H3A 0G4, Canada.
- Molecular and Regenerative Medicine Axis, Lady Davis Institute for Medical Research, Sir Mortimer B Davis Jewish General Hospital, 3755 ch. Côte Ste-Catherine, Montréal, QC, H3T 1E2, Canada.
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12
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Foveau B, Albrecht S, Bennett DA, Correa JA, LeBlanc AC. Increased Caspase-6 activity in the human anterior olfactory nuclei of the olfactory bulb is associated with cognitive impairment. Acta Neuropathol Commun 2016; 4:127. [PMID: 27931265 PMCID: PMC5146837 DOI: 10.1186/s40478-016-0400-x] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2016] [Accepted: 12/01/2016] [Indexed: 02/06/2023] Open
Abstract
Abnormally elevated hippocampal Caspase-6 (Casp6) activity is intimately associated with age-related cognitive impairment in humans and in mice. In humans, these high levels of Casp6 activity are initially localized in the entorhinal cortex, the area of the brain first affected by the formation of neurofibrillary tangles, according to Braak staging. The reason for the high vulnerability of entorhinal cortex neurons to neurofibrillary tangle pathology and Casp6 activity is unknown. Casp6 activity is involved in axonal degeneration, therefore, one possibility to explain increased vulnerability of the entorhinal cortex neurons would be that the afferent neurons of the olfactory bulb, some of which project their axons to the entorhinal cortex, are equally degenerating. To examine this possibility, we examined the presence of Casp6 activity, neurofibrillary tangle formation and amyloid deposition by immunohistochemistry with neoepitope antisera against the p20 subunit of active Casp6 and Tau cleaved by Casp6 (Tau∆Casp6), phosphorylated Tau paired helical filament (PHF-1) antibodies and anti-β-amyloid antiserum, respectively, in brains from individuals with no or mild cognitive impairment and Alzheimer disease (AD) dementia. Co-localization of Casp6 activity, PHF-1 and β-amyloid was detected mostly in the anterior olfactory nucleus (AON) of the olfactory bulb. The levels of active Casp6 in the AON, which were the highest in the AD brains, correlated with PHF-1 levels, but not with β-amyloid levels. AON Tau∆Casp6 levels correlated with entorhinal cortex Casp6 activity and PHF-1 levels. Multiple regression analyses demonstrated that AON Casp6 activity was associated with lower global cognitive function, mini mental state exam, episodic memory and semantic memory scores. These results suggest that AON Casp6 activity could lead to Casp6-mediated degeneration in the entorhinal cortex, but cannot exclude the possibilities that entorhinal cortex degeneration signals degeneration in the AON or that the pathologies occur in both regions independently. Nevertheless, AON Casp6 activity reflects that of the entorhinal cortex.
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Affiliation(s)
- Benedicte Foveau
- Bloomfield Center for Research in Aging, Lady Davis Institute for Medical Research, Jewish General Hospital, 3755 ch. Côte Ste-Catherine, Montreal, QC Canada
| | - Steffen Albrecht
- Department of Pathology, Montreal Children’s Hospital and McGill University, Montreal, QC Canada
| | - David A. Bennett
- Rush Alzheimer’s Disease Center, Rush University Medical Center, Chicago, IL USA
| | - José A. Correa
- Department of Mathematics and Statistics, McGill University, Montreal, QC Canada
| | - Andrea C. LeBlanc
- Bloomfield Center for Research in Aging, Lady Davis Institute for Medical Research, Jewish General Hospital, 3755 ch. Côte Ste-Catherine, Montreal, QC Canada ,Department of Neurology and Neurosurgery, McGill University, Montreal, QC Canada
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13
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Linder M, Tschernig T. Vasculogenic mimicry: Possible role of effector caspase-3, caspase-6 and caspase-7. Ann Anat 2015; 204:114-7. [PMID: 26704356 DOI: 10.1016/j.aanat.2015.11.007] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2015] [Revised: 11/02/2015] [Accepted: 11/18/2015] [Indexed: 11/24/2022]
Abstract
Vasculogenic mimicry (VM) describes the process by which aggressive cancer cells form extracellular matrix-rich, vessel-like mesh works, which supply nutrients and oxygen. Furthermore, it offers a new route for tumor cell invasion and metastasis and thus a correspondingly poor prognosis and survival rate for affected patients. Effector caspases are well known for their apoptotic function, whereas a non-apoptotic function in tumor progression is highly disputed. Caspase-3, -6 and -7 are expressed in aggressive tumor cells in a non-mutated form, indicating an active function independent of apoptosis. This review summarizes the possible functions of the above-mentioned caspases in VM. We also discuss the possible involvement of caspases in potential mechanisms towards the formation of vessel-like structures. Furthermore, this review illustrates the importance of new studies in the ongoing investigation into the role of effector caspases in VM, invasion, and migration of aggressive tumor cells.
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Affiliation(s)
- Manuel Linder
- Center of Human and Molecular Biology, Saarland University, Saarbruecken, Germany
| | - Thomas Tschernig
- Department of Anatomy and Cell Biology, Saarland University, Homburg, Saar, Germany.
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14
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Cho KJ, Kim GW. Differential caspase activity in the cortex and striatum with chronic infusion of 3-nitropropionic acid. Biochem Biophys Res Commun 2015; 465:631-7. [PMID: 26297950 DOI: 10.1016/j.bbrc.2015.08.075] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2015] [Accepted: 08/17/2015] [Indexed: 12/24/2022]
Abstract
Systemic administration of 3-nitropropionic acid (3-NP) facilitates the development of select striatal lesions, and some reports provide clues about this pathology. In this study, we investigated the relationship between reduced levels of brain-derived neurotrophic factor (BDNF) in lesioned brain regions and caspase activity, as well as involvement of apoptosis signal-regulating kinase 1 (ASK1) in caspase activation. We analyzed apoptotic cell death, BDNF distribution, caspase-3 activity, caspase-6 activity, ASK1 expression level, and active ASK1 in the cortex and striatum. There were different levels and distributions of these factors within each sub-region. Caspase-6 activity was reduced with down-regulation of ASK1 in the cortex. BDNF protein levels did not decrease in the cortex, but there was replenishment of severely reduced BDNF in the striatum. The present study suggests that an increase in ASK1 in the damaged cortex is related to caspase-6 activation and is involved in cortical depletion of BDNF in the striatum. Furthermore, with systemic infusion of 3-NP, differential expression of ASK1 in the cortex and striatum suggests that this kinase may modulate caspase activation and striatal degeneration.
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15
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Wong BKY, Ehrnhoefer DE, Graham RK, Martin DDO, Ladha S, Uribe V, Stanek LM, Franciosi S, Qiu X, Deng Y, Kovalik V, Zhang W, Pouladi MA, Shihabuddin LS, Hayden MR. Partial rescue of some features of Huntington Disease in the genetic absence of caspase-6 in YAC128 mice. Neurobiol Dis 2015; 76:24-36. [PMID: 25583186 DOI: 10.1016/j.nbd.2014.12.030] [Citation(s) in RCA: 43] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2014] [Revised: 12/22/2014] [Accepted: 12/31/2014] [Indexed: 12/13/2022] Open
Abstract
Huntington Disease (HD) is a progressive neurodegenerative disease caused by an elongated CAG repeat in the huntingtin (HTT) gene that encodes a polyglutamine tract in the HTT protein. Proteolysis of the mutant HTT protein (mHTT) has been detected in human and murine HD brains and is implicated in the pathogenesis of HD. Of particular importance is the site at amino acid (aa) 586 that contains a caspase-6 (Casp6) recognition motif. Activation of Casp6 occurs presymptomatically in human HD patients and the inhibition of mHTT proteolysis at aa586 in the YAC128 mouse model results in the full rescue of HD-like phenotypes. Surprisingly, Casp6 ablation in two different HD mouse models did not completely prevent the generation of this fragment, and therapeutic benefits were limited, questioning the role of Casp6 in the disease. We have evaluated the impact of the loss of Casp6 in the YAC128 mouse model of HD. Levels of the mHTT-586 fragment are reduced but not absent in the absence of Casp6 and we identify caspase 8 as an alternate enzyme that can generate this fragment. In vivo, the ablation of Casp6 results in a partial rescue of body weight gain, normalized IGF-1 levels, a reversal of the depression-like phenotype and decreased HTT levels. In the YAC128/Casp6-/- striatum there is a concomitant reduction in p62 levels, a marker of autophagic activity, suggesting increased autophagic clearance. These results implicate the HTT-586 fragment as a key contributor to certain features of HD, irrespective of the enzyme involved in its generation.
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Affiliation(s)
- Bibiana K Y Wong
- Centre for Molecular Medicine and Therapeutics, Child and Family Research Institute, Department of Medical Genetics, University of British Columbia, Vancouver, British Columbia V5Z 4H4, Canada; Department of Obstetrics and Gynecology, Baylor College of Medicine, Houston, TX 77030, USA
| | - Dagmar E Ehrnhoefer
- Centre for Molecular Medicine and Therapeutics, Child and Family Research Institute, Department of Medical Genetics, University of British Columbia, Vancouver, British Columbia V5Z 4H4, Canada
| | - Rona K Graham
- Centre for Molecular Medicine and Therapeutics, Child and Family Research Institute, Department of Medical Genetics, University of British Columbia, Vancouver, British Columbia V5Z 4H4, Canada; Research Center on Aging, Department of Physiology and Biophysics, University of Sherbrooke, Sherbrooke, Quebec J1H 5N4, Canada
| | - Dale D O Martin
- Centre for Molecular Medicine and Therapeutics, Child and Family Research Institute, Department of Medical Genetics, University of British Columbia, Vancouver, British Columbia V5Z 4H4, Canada
| | - Safia Ladha
- Centre for Molecular Medicine and Therapeutics, Child and Family Research Institute, Department of Medical Genetics, University of British Columbia, Vancouver, British Columbia V5Z 4H4, Canada
| | - Valeria Uribe
- Centre for Molecular Medicine and Therapeutics, Child and Family Research Institute, Department of Medical Genetics, University of British Columbia, Vancouver, British Columbia V5Z 4H4, Canada
| | - Lisa M Stanek
- Genzyme, a Sanofi Company, Framingham, MA 01701, USA
| | - Sonia Franciosi
- Centre for Molecular Medicine and Therapeutics, Child and Family Research Institute, Department of Medical Genetics, University of British Columbia, Vancouver, British Columbia V5Z 4H4, Canada
| | - Xiaofan Qiu
- Centre for Molecular Medicine and Therapeutics, Child and Family Research Institute, Department of Medical Genetics, University of British Columbia, Vancouver, British Columbia V5Z 4H4, Canada
| | - Yu Deng
- Centre for Molecular Medicine and Therapeutics, Child and Family Research Institute, Department of Medical Genetics, University of British Columbia, Vancouver, British Columbia V5Z 4H4, Canada
| | - Vlad Kovalik
- Centre for Molecular Medicine and Therapeutics, Child and Family Research Institute, Department of Medical Genetics, University of British Columbia, Vancouver, British Columbia V5Z 4H4, Canada
| | - Weining Zhang
- Centre for Molecular Medicine and Therapeutics, Child and Family Research Institute, Department of Medical Genetics, University of British Columbia, Vancouver, British Columbia V5Z 4H4, Canada
| | - Mahmoud A Pouladi
- Centre for Molecular Medicine and Therapeutics, Child and Family Research Institute, Department of Medical Genetics, University of British Columbia, Vancouver, British Columbia V5Z 4H4, Canada; Translational Laboratory in Genetic Medicine, Agency for Science, Technology and Research, 138648, Singapore; Department of Medicine, Yong Loo Lin School of Medicine, National University of Singapore, 138648, Singapore
| | | | - Michael R Hayden
- Centre for Molecular Medicine and Therapeutics, Child and Family Research Institute, Department of Medical Genetics, University of British Columbia, Vancouver, British Columbia V5Z 4H4, Canada.
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16
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Fennell LM, Fleming JV. Differential processing of mammalian L-histidine decarboxylase enzymes. Biochem Biophys Res Commun 2014; 445:304-9. [PMID: 24508257 DOI: 10.1016/j.bbrc.2014.01.178] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2014] [Accepted: 01/28/2014] [Indexed: 11/19/2022]
Abstract
In the mammalian species studied so far, the L-histidine decarboxylase (HDC) enzyme responsible for histamine biosynthesis has been shown to undergo post-translational processing. The processing is best characterized for the mouse enzyme, where di-asparate DD motifs mediate the production of active ~55 and ~60 kDa isoforms from the ~74 kDa precursor in a caspase-9 dependent manner. The identification of conserved di-aspartate motifs at similar locations in the rat and human HDC protein sequences has led to proposals that these may represent important processing sites in these species also. Here we used transfected Cos7 cells to demonstrate that the rat and human HDC proteins undergo differential processing compared to each other, and found no evidence to suggest that conserved di-aspartate motifs are required absolutely for processing in this cell type. Instead we identified SKD and EEAPD motifs that are important for caspase-6 dependent production of ~54 and ~59 kDa isoforms in the rat and human proteins, respectively. The addition of staurosporine, which is known to pharmacologically activate caspase enzymes, increased processing of the human HDC protein. We propose that caspase-dependent processing is a conserved feature of mammalian HDC enzymes, but that proteolysis may involve different enzymes and occur at diverse sites and sequences.
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Affiliation(s)
- Lilian M Fennell
- School of Biochemistry and Cell Biology, School of Pharmacy, and Analytical and Biological Chemistry Research Facility, University College Cork, Cork, Ireland
| | - John V Fleming
- School of Biochemistry and Cell Biology, School of Pharmacy, and Analytical and Biological Chemistry Research Facility, University College Cork, Cork, Ireland.
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17
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Shahzidi S, Brech A, Sioud M, Li X, Suo Z, Nesland JM, Peng Q. Lamin A/C cleavage by caspase-6 activation is crucial for apoptotic induction by photodynamic therapy with hexaminolevulinate in human B-cell lymphoma cells. Cancer Lett 2013; 339:25-32. [PMID: 23916608 DOI: 10.1016/j.canlet.2013.07.026] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2013] [Accepted: 07/24/2013] [Indexed: 01/16/2023]
Abstract
Photodynamic therapy (PDT) with a light-activated drug is an approved modality for cancer treatment. Hexaminolevulinate (HAL), a hexylester of 5-aminolevulinic acid as the photosensitising protoporphyrin IX (PpIX) precursor, is clinically used for both PDT and photodetection. Our previous studies have shown that HAL-PDT can effectively induce apoptosis in several human blood malignant cell lines. However, the mechanisms involved in the apoptotic induction are still not fully elucidated. In this study we have focused on the role of cellular lamin A/C in the apoptotic induction. HAL-PDT-mediated apoptosis was confirmed by various techniques including fluorescence microscopy and electron microscopy in both human B-cell lymphoma Ramos and Daudi cell lines. The lamin A/C, together with caspases-6 and -3, was cleaved during the apoptosis. Western blots, immunocytochemistry, fluorescence microscopy and electron microscopy demonstrated that the specific caspase-6 inhibitor abrogated the HAL-PDT-mediated cleavages of both caspase-6 and lamin A/C and subsequent apoptosis in these two cell lines, suggesting that the cleavage of lamin A/C by the caspase-6 activation is crucial for such apoptotic induction.
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Affiliation(s)
- Susan Shahzidi
- Department of Pathology, The Norwegian Radium Hospital, Oslo University Hospital and Medical Faculty, University of Oslo, Oslo, Norway
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