1
|
Nguyen GN, Lindgren JR, Seleme MC, Kafle S, Zander CB, Zheng XL, Sabatino DE. Altered cleavage of human factor VIII at the B-domain and acidic region 3 interface enhances expression after gene therapy in hemophilia A mice. J Thromb Haemost 2023; 21:2101-2113. [PMID: 37080538 DOI: 10.1016/j.jtha.2023.04.012] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2022] [Revised: 03/17/2023] [Accepted: 04/04/2023] [Indexed: 04/22/2023]
Abstract
BACKGROUND Variants of human factor VIII (hFVIII) have been developed to further understand the structure and function of hFVIII and improve gene-based therapeutics. We have previously characterized several hFVIII variants of the furin cleavage site (1645-1648) with improved secretion. We have also identified a second cleavage site in the acidic region 3 (a3) (1657-1658) that becomes the primary hFVIII intracellular cleavage position in the absence of the furin site. We tested a hypothesis that modification of this site may confer additional functional advantages to hFVIII. OBJECTIVES The aim of this study was to conduct the biochemical and functional characterization of hFVIII variants of the furin cleavage site, the a3 cleavage site, or in combination, both in vitro and in vivo after AAV mediated gene therapy. METHODS Recombinant hFVIII variants of the furin cleavage site (hFVIII-Δ3), the a3 cleavage site (hFVIII-S1657P/D1658E [SP/DE]), or in combination (hFVIII-Δ3-SP/DE) were purified and characterized in vitro and in vivo. RESULTS Recombinant hFVIII-Δ3, hFVIII-SP/DE, and hFVIII-Δ3-SP/DE variants all had comparable specific activity to B-domain deleted (BDD) hFVIII. Hemophilia A mice tolerant to hFVIII did not develop immune responses to hFVIII after protein challenge with these variants or after adeno-associated virus (AAV) delivery. Following AAV delivery, hFVIII-Δ3-SP/DE resulted in expression levels that were 2- to 5-fold higher than those with hFVIII-BDD in hemophilia A mice. CONCLUSION The novel hFVIII-Δ3-SP/DE variant of the furin and a3 cleavage sites significantly improved secretion compared with hFVIII-BDD. This key feature of the Δ3-SP/DE variant provides a unique strategy that can be combined with other approaches to further improve factor VIII expression to achieve superior efficacy in AAV-based gene therapy for hemophilia A.
Collapse
Affiliation(s)
- Giang N Nguyen
- The Raymond G. Perelman Center for Cellular and Molecular Therapeutics, The Children's Hospital of Philadelphia, Philadelphia, Pennsylvania, USA
| | - Jonathan R Lindgren
- The Raymond G. Perelman Center for Cellular and Molecular Therapeutics, The Children's Hospital of Philadelphia, Philadelphia, Pennsylvania, USA
| | - Maria C Seleme
- The Raymond G. Perelman Center for Cellular and Molecular Therapeutics, The Children's Hospital of Philadelphia, Philadelphia, Pennsylvania, USA
| | - Samita Kafle
- The Raymond G. Perelman Center for Cellular and Molecular Therapeutics, The Children's Hospital of Philadelphia, Philadelphia, Pennsylvania, USA
| | - Catherine B Zander
- Department of Pathology, University of Alabama at Birmingham School of Medicine, University of Alabama, Birmingham, Alabama, USA
| | - X Long Zheng
- Department of Pathology and Laboratory Medicine, The University of Kansas Medical Center, Kansas City, Kansas, USA; Institute of Reproductive Medicine and Developmental Science, The University of Kansas Medical Center, Kansas City, Kansas, USA
| | - Denise E Sabatino
- The Raymond G. Perelman Center for Cellular and Molecular Therapeutics, The Children's Hospital of Philadelphia, Philadelphia, Pennsylvania, USA; Department of Pediatrics, Division of Hematology, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania, USA.
| |
Collapse
|
2
|
Pinninti SG, Pati S, Poole C, Latting M, Seleme MC, Yarbrough A, Arora N, Britt WJ, Boppana S. Virological Characteristics of Hospitalized Children With SARS-CoV-2 Infection. Pediatrics 2021; 147:e2020037812. [PMID: 33622794 PMCID: PMC8086003 DOI: 10.1542/peds.2020-037812] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Accepted: 02/16/2021] [Indexed: 02/06/2023] Open
Abstract
BACKGROUND AND OBJECTIVES In children with severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) infection, virological characteristics and correlation with disease severity have not been extensively studied. The primary objective in this study is to determine the correlation between SARS-CoV-2 viral load (VL) in infected children with age, disease severity, and underlying comorbidities. METHODS Children <21 years, screened for SARS-CoV-2 at the time of hospitalization, who tested positive by polymerase chain reaction were included in this study. VL at different sites was determined and compared between groups. RESULTS Of the 102 children included in this study, 44% of the cohort had asymptomatic infection, and children with >1 comorbidity were the most at risk for severe disease. VL in children with symptomatic infection was significantly higher than in children with asymptomatic infection (3.0 × 105 vs 7.2 × 103 copies per mL; P = .001). VL in the respiratory tract was significantly higher in children <1 year, compared with older children (3.3 × 107 vs 1.3 × 104 copies per mL respectively; P < .0001), despite most infants presenting with milder illness. Besides the respiratory tract, SARS-CoV-2 RNA was also detectable in samples from the gastrointestinal tract (saliva and rectum) and blood. In 13 children for whom data on duration of polymerase chain reaction positivity was available, 12 of 13 tested positive 2 weeks after initial diagnosis, and 6 of 13 continued to test positive 4 weeks after initial diagnosis. CONCLUSIONS In hospitalized children with SARS-CoV-2, those with >1 comorbid condition experienced severe disease. SARS-CoV-2 VL in the respiratory tract is significantly higher in children with symptomatic disease and children <1 year of age.
Collapse
Affiliation(s)
| | | | | | | | - Maria C Seleme
- Division of Hematology, Center for Cellular and Molecular Therapeutics, Children's Hospital of Philadelphia, Philadelphia, Pennsylvania; and
| | - April Yarbrough
- Department of Pharmacy, Children's of Alabama, Birmingham, Alabama
| | | | - William J Britt
- Departments of Pediatrics and
- Microbiology, School of Medicine, University of Alabama at Birmingham, Birmingham, Alabama
| | - Suresh Boppana
- Departments of Pediatrics and
- Microbiology, School of Medicine, University of Alabama at Birmingham, Birmingham, Alabama
| |
Collapse
|
3
|
Pinninti S, Trieu C, Pati SK, Latting M, Cooper J, Seleme MC, Boppana S, Arora N, Britt WJ, Boppana SB. Comparing Nasopharyngeal and Midturbinate Nasal Swab Testing for the Identification of Severe Acute Respiratory Syndrome Coronavirus 2. Clin Infect Dis 2021; 72:1253-1255. [PMID: 32596725 PMCID: PMC7337631 DOI: 10.1093/cid/ciaa882] [Citation(s) in RCA: 39] [Impact Index Per Article: 13.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2020] [Accepted: 06/22/2020] [Indexed: 12/18/2022] Open
Abstract
Testing of paired mid-turbinate (MT) nasal and nasopharyngeal (NP) swabs, collected by trained personnel from 40 patients with COVID-19 showed more NP (76/95, 80%) than MT swabs tested positive (61/95, 64%; p=0.02). Among samples collected a week after study enrollment, fewer MT than NP samples were positive (45% vs 76%; p=0.001).
Collapse
Affiliation(s)
- Swetha Pinninti
- Department of Pediatrics, University of Alabama at Birmingham, Birmingham, Alabama, USA
| | - Connie Trieu
- Department of Pediatrics, University of Alabama at Birmingham, Birmingham, Alabama, USA
| | - Sunil K Pati
- Department of Pediatrics, University of Alabama at Birmingham, Birmingham, Alabama, USA
| | - Misty Latting
- Department of Pediatrics, University of Alabama at Birmingham, Birmingham, Alabama, USA
| | - Joshua Cooper
- Department of Pediatrics, University of Alabama at Birmingham, Birmingham, Alabama, USA
| | - Maria C Seleme
- Department of Pediatrics, University of Alabama at Birmingham, Birmingham, Alabama, USA
| | - Sushma Boppana
- Department of Medicine, University of Alabama at Birmingham, Birmingham, Alabama, USA
| | - Nitin Arora
- Department of Pediatrics, University of Alabama at Birmingham, Birmingham, Alabama, USA
| | - William J Britt
- Department of Pediatrics, University of Alabama at Birmingham, Birmingham, Alabama, USA.,Department of Microbiology, University of Alabama at Birmingham, Birmingham, Alabama, USA
| | - Suresh B Boppana
- Department of Pediatrics, University of Alabama at Birmingham, Birmingham, Alabama, USA.,Department of Microbiology, University of Alabama at Birmingham, Birmingham, Alabama, USA
| |
Collapse
|
4
|
Sung CYW, Seleme MC, Payne S, Jonjic S, Hirose K, Britt W. Virus-induced cochlear inflammation in newborn mice alters auditory function. JCI Insight 2019; 4:128878. [PMID: 31484824 DOI: 10.1172/jci.insight.128878] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [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: 03/21/2019] [Accepted: 08/01/2019] [Indexed: 02/06/2023] Open
Abstract
Although human cytomegalovirus (HCMV) is a known cause of sensorineural hearing loss in infants with congenital HCMV (cCMV) infections, mechanisms that contribute to sensorineural hearing loss (SNHL) in infants with cCMV infection are not well defined. Using a murine model of CMV infection during auditory development, we have shown that peripheral infection of newborn mice with murine CMV (MCMV) results in focal infection of the cochlea and virus-induced cochlear inflammation. Approximately 50%-60% of infected mice exhibited increased auditory brainstem response (ABR) thresholds across a range of sound frequencies. Histological analyses of the cochlea in MCMV-infected mice with elevated ABR thresholds revealed preservation of hair cell (HC) number and morphology in the organ of Corti. In contrast, the number of spiral ganglion neurons (SGN), synapses, and neurites connecting the cochlear HC and SGN nerve terminals were decreased. Decreasing cochlear inflammation by corticosteroid treatment of MCMV-infected mice resulted in preservation of SGN and improved auditory function. These findings show that virus-induced cochlear inflammation during early auditory development, rather than direct virus-mediated damage, could contribute to histopathology in the cochlea and altered auditory function without significant loss of HCs in the sensory epithelium.
Collapse
Affiliation(s)
| | - Maria C Seleme
- Department of Pediatrics, University of Alabama School of Medicine, Birmingham, Alabama, USA
| | - Shelby Payne
- Department of Otolaryngology, Washington University, St. Louis, Missouri, USA
| | - Stipan Jonjic
- Department of Histology and Embryology, Faculty of Medicine, University of Rijeka, Rijeka, Croatia
| | - Keiko Hirose
- Department of Otolaryngology, Washington University, St. Louis, Missouri, USA
| | - William Britt
- Department of Microbiology and.,Department of Pediatrics, University of Alabama School of Medicine, Birmingham, Alabama, USA.,Department of Neurobiology, University of Alabama School of Medicine, Birmingham, Alabama, USA
| |
Collapse
|
5
|
Seleme MC, Lei W, Burg AR, Goh KY, Metz A, Steele C, Tse HM. Dysregulated TLR3-dependent signaling and innate immune activation in superoxide-deficient macrophages from nonobese diabetic mice. Free Radic Biol Med 2012; 52:2047-56. [PMID: 22361747 PMCID: PMC3711256 DOI: 10.1016/j.freeradbiomed.2012.01.027] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/12/2011] [Revised: 01/27/2012] [Accepted: 01/27/2012] [Indexed: 12/26/2022]
Abstract
In type 1 diabetes (T1D), reactive oxygen species (ROS) and proinflammatory cytokines produced by macrophages and other innate immune cells destroy pancreatic β cells while promoting autoreactive T cell maturation. Superoxide-deficient nonobese diabetic mice (NOD.Ncf1(m1J)) are resistant to spontaneous diabetes, revealing the integral role of ROS signaling in T1D. Here, we evaluate the innate immune activation state of bone marrow-derived macrophages (BM-Mϕ) from NOD and NOD.Ncf1(m1J) mice after poly(I:C)-induced Toll-like receptor 3 (TLR3) signaling. We show that ROS synthesis is required for efficient activation of the NF-κB signaling pathway and concomitant expression of TLR3 and the cognate adaptor molecule, TRIF. Poly(I:C)-stimulated NOD.Ncf1(m1J) BM-Mϕ exhibited a 2- and 10-fold decrease in TNF-α and IFN-β proinflammatory cytokine synthesis, respectively, in contrast to NOD BM-Mϕ. Optimal expression of IFN-α/β is not solely dependent on superoxide synthesis, but requires p47(phox) to function in a NOX-independent manner to mediate type I interferon synthesis. Interestingly, MHC-II I-A(g7) expression necessary for CD4 T cell activation is increased 2-fold relative to NOD, implicating a role for superoxide in I-A(g7) downregulation. These findings suggest that defective innate immune-pattern-recognition receptor activation and subsequent decrease in TNF-α and IFN-β proinflammatory cytokine synthesis necessary for autoreactive T cell maturation may contribute to the T1D protection observed in NOD.Ncf1(m1J) mice.
Collapse
Affiliation(s)
- Maria C. Seleme
- Department of Microbiology, Comprehensive Diabetes Center, University of Alabama at Birmingham, Birmingham, AL 35294
| | - Weiqi Lei
- Department of Microbiology, Comprehensive Diabetes Center, University of Alabama at Birmingham, Birmingham, AL 35294
| | - Ashley R. Burg
- Department of Microbiology, Comprehensive Diabetes Center, University of Alabama at Birmingham, Birmingham, AL 35294
| | - Kah Yong Goh
- Department of Microbiology, Comprehensive Diabetes Center, University of Alabama at Birmingham, Birmingham, AL 35294
| | - Allison Metz
- Department of Medicine/Division of Pulmonary, University of Alabama at Birmingham, Birmingham, AL, 35294
| | - Chad Steele
- Department of Medicine/Division of Pulmonary, University of Alabama at Birmingham, Birmingham, AL, 35294
| | - Hubert M. Tse
- Department of Microbiology, Comprehensive Diabetes Center, University of Alabama at Birmingham, Birmingham, AL 35294
- Address correspondence to: Hubert M. Tse, Department of Microbiology, Comprehensive Diabetes Center, 1825 University Boulevard, SHEL 1202, Birmingham, AL 35294, Phone: (205) 934-7037, Fax: (205) 996-5220,
| |
Collapse
|
6
|
Abstract
Determining the subcellular localization of the L1 ORF2 protein (ORF2p) has been impossible to date because of technical limitations in detecting either endogenous or overexpressed forms of the protein. Here we report visualization of the full-length ORF2p in cultured human cells following expression in a modified vaccinia virus/T7 RNA polymerase (MVA/T7RP) system. The MVA/T7RP system was used to ascertain subcellular localization of L1 ORF1p and ORF2p both as fusions with green fluorescent protein and by immunocytochemistry. Full-length ORF2p was predominantly cytoplasmic, while carboxy-terminal-deleted ORF2p localized additionally to the nucleolus. We mapped a functional nucleolar localization signal in ORF2p. ORF1p appeared in the cytoplasm with a speckled pattern and colocalized with ORF2p in nucleoli in a subset of cells. These findings help explain the presence of chimeras between L1s and small RNA gene sequences recently discovered in the human genome.
Collapse
Affiliation(s)
- John L Goodier
- Department of Genetics, University of Pennsylvania School of Medicine, Philadelphia 19104, USA.
| | | | | | | | | |
Collapse
|
7
|
Seleme MC, Busseau I, Malinsky S, Bucheton A, Teninges D. High-frequency retrotransposition of a marked I factor in Drosophila melanogaster correlates with a dynamic expression pattern of the ORF1 protein in the cytoplasm of oocytes. Genetics 1999; 151:761-71. [PMID: 9927467 PMCID: PMC1460479 DOI: 10.1093/genetics/151.2.761] [Citation(s) in RCA: 36] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
To study the expression of the I factor, a non-long-terminal-repeat retrotransposon responsible for I-R hybrid dysgenesis in Drosophila melanogaster, we have tagged the ORF1 protein (ORF1p) by inserting the HA epitope in its N-terminal region. In transgenic flies, this modification is compatible with a high rate of autonomous transposition and allows direct estimation of the transposition frequency. I factor transposes in the germline of females (SF) that are daughters from crosses between I strain males (which contain active copies of the I factor) and R strain females (which do not). We analyzed the expression pattern of ORF1p by indirect immunofluorescence. Its expression correlates with retrotransposition. During oogenesis ORF1p appears unexpectedly as a cytoplasmic product, which accumulates with a specific pattern into the oocyte. A comparison of the expression patterns under conditions that modify the transposing activity of the element clarifies some aspects of I-factor functioning in the transposition process.
Collapse
Affiliation(s)
- M C Seleme
- Centre de Génétique Moléculaire, CNRS, 91198 Gif sur Yvette Cedex, France
| | | | | | | | | |
Collapse
|
8
|
Labrador M, Seleme MC, Fontdevila A. The evolutionary history of Drosophila buzzatii. XXXIV. The distribution of the retrotransposon Osvaldo in original and colonizing populations. Mol Biol Evol 1998; 15:1532-47. [PMID: 12572617 DOI: 10.1093/oxfordjournals.molbev.a025881] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
The frequency distribution of the retrotransposon Osvaldo in the haploid genome of Drosophila buzzatii has been studied in five natural populations from the Iberian Peninsula and six natural populations from Argentina. In Iberian populations, Osvaldo insertion sites do not follow a Poisson distribution, most probably due to eight euchromatic sites with high occupancy, found in all populations. The estimated alpha and beta parameters, which measure the relative importance of drift and negative selection in shaping frequency distributions, indicate that drift is the main force acting upon the distribution of Osvaldo in natural populations of D. buzzatii in the Iberian Peninsula. On the other hand, Osvaldo distribution in populations from Argentina is similar to the distribution of elements with low copy numbers, such as those described for Drosophila melanogaster and Drosophila simulans: there are no indications for deviation from a Poisson distribution, there is a low occupancy per insertion site, and genetic drift has no apparent effect on the frequency distribution. We propose that the unusual distribution found in the populations from the Iberian Peninsula is a consequence of the colonization process. Iberian Peninsula populations suffered a genomic redistribution of Osvaldo, most probably after a founder effect. Consequently, certain copies that arrived at high frequencies are showing a high occupancies today, and the mean copy number of Osvaldo is higher in Iberian Peninsula populations than in populations from Argentina. All other copies are the result of recent (after colonization) transposition events.
Collapse
Affiliation(s)
- M Labrador
- Departament de Genètica i de Microbiologia, Universitat Autònoma de Barcelona, Spain.
| | | | | |
Collapse
|