Skip directly to site content Skip directly to page options Skip directly to A-Z link Skip directly to A-Z link Skip directly to A-Z link
Volume 21, Number 1—January 2015

WU Polyomavirus in Respiratory Epithelial Cells from Lung Transplant Patient with Job Syndrome

Article Metrics
citations of this article
EID Journal Metrics on Scopus
Erica A. Siebrasse, Diana V. Pastrana, Nang L. Nguyen, Annie Wang, Mark J. Roth, Steven M. Holland, Alexandra F. Freeman, John McDyer, Christopher B. Buck, and David WangComments to Author 
Author affiliations: Washington University School of Medicine, St. Louis, Missouri, USA (E.A. Siebrasse, N.L. Nguyen, A. Wang, D. Wang); National Institutes of Health, Bethesda, Maryland, USA (D.V. Pastrana, M.J. Roth, S.M. Holland, A.F. Freeman, C.B. Buck); University of Pittsburgh Medical Center, Pittsburgh, Pennsylvania, USA (J. McDyer)

Cite This Article


We detected WU polyomavirus (WUPyV) in a bronchoalveolar lavage sample from lungs transplanted into a recipient with Job syndrome by using immunoassays specific for the WUPyV viral protein 1. Co-staining for an epithelial cell marker identified most WUPyV viral protein 1–positive cells as respiratory epithelial cells.

WU polyomavirus (WUPyV) was discovered in a child with pneumonia in 2007 (1). Subsequent studies showed that WUPyV infection is common (24), and viral DNA can be detected in a variety of specimen types, including respiratory tract secretions (5). However, the virus has yet to be associated with any disease, and the specific cell type(s) infected by WUPyV has not been identified. Other human polyomaviruses are known pathogens, which typically cause disease in the context of immunosuppression (68).

Job syndrome is an immune disorder characterized by eczematoid dermatitis, recurrent skin and pulmonary infections, increased levels of IgE, and impaired T and B cell memory (9). This disorder is caused by dominant-negative mutations in the STAT3 gene (9). We report WUPyV cell tropism in lungs transplanted into a recipient with Job syndrome.

The Study

These studies were approved by institutional review boards at the National Institutes of Health (NIH) and Washington University. A 28-year-old woman with Job syndrome was seen at the NIH Clinical Center 6 months after bilateral lung transplantation. She had a bronchoscopic evaluation to follow up on endobronchial aspergillosis. Pathologic examination of a bronchoalveolar lavage (BAL) sample showed scattered cells, primarily columnar bronchial cells, with cytomorphologic changes reminiscent of BK polyomavirus (BKPyV)–infected decoy cells. The cells stained positive with PAb416, a monoclonal antibody against the SV40 large T antigen. The patient had BKPyV viremia (8.1 × 105 copies/mL) and viruria (6.9 × 109 copies/mL). JC polyomavirus was also detected in the urine but not in the blood. The BAL sample was weakly positive for BKPyV by PCR (<250 copies/mL) and negative for JC polyomavirus. Clinical or radiographic signs and symptoms of infection were not apparent.

Nonenveloped virions were purified from the BAL sample by using ultracentrifugation with Optiprep (#D1556; Sigma-Aldrich, St. Louis, MO, USA) (10). DNA was extracted from the virion preparation and subjected to random-primed rolling circle amplification (RCA) and restriction enzyme digestion, which yielded 2 strong bands. The bands were cloned and identified as WUPyV by using Sanger sequencing. The complete genomic sequence of the isolate, designated J1 (GenBank accession no. KJ643309), was confirmed by using miSeq analysis (Illumnina, San Diego, CA, USA) of the RCA product. A second WUPyV variant with 2-nt polymorphisms and a single base insertion was also detected in the RCA product. No other known viruses (including BKPyV) were observed by deep sequencing.

We developed an immunohistochemical (IHC) assay to detect the WUPyV viral protein 1 (WU-VP1) by using an IgG2b designated NN-Ab06. Recombinant histidine-tagged WU-VP1 protein was generated by expressing WU-VP1 (GenBank accession no. ABQ09289) in Escherichia coli from a Gateway pDEST17 plasmid (Life Technologies, Carlsbad, CA, USA) and purifying the protein by using an affinity Ni-NTA column (Pierce Biotechnology, Rockford, IL, USA). After generation of hybridomas, we identified clones producing antibody against WU-VP1 by ELISA and immunoblot. Clones that cross-reacted with KI polyomavirus VP1 (KI-VP1) were identified by ELISA with glutathione S-transferase–tagged KI-VP1 (2) and eliminated.

To generate positive control cells for IHC assay optimization, we transfected 293T cells with plasmid pDEST26-WU-VP1 (Life Technologies). A subset of cells was fixed in 10% neutral-buffered formalin and embedded in paraffin. IHC testing was performed by deparaffinizing slides in xylene and rehydrating them in a series of ethanol solutions. After treating slides with 3% hydrogen peroxide, antigen was retrieved in citrate buffer, pH 6.0 (10 mmol/L citric acid, 0.05% Tween 20) in a pressure cooker (PC6–25; Nesco, Two Rivers, WI, USA) for 3 min on the high setting.

Slides were blocked in 1.5% normal horse serum (#S-200; Vector Laboratories, Burlingame, CA, USA) and incubated with NN-Ab06, then with biotinylated anti-mouse IgG (BA-2000; Vector Laboratories). After development by using the Vectastain Avidin–Biotin Complex Kit (#PK-6100; Vector Laboratories) and (3,3′-diaminobenzidine) (#SK-4100; Vector Laboratories), we counterstained tissues with hematoxylin.

Figure 1

Thumbnail of WU polyomavirus antigen in bronchoalveolar lavage specimens from lungs transplanted into a recipient (28-year-old woman) with Job syndrome. Immunohistochemical analysis of 293T cells transfected with pDEST26-WU–virus protein 1 and stained as follows. A) WU virus protein 1 monoclonal antibody (NN-Ab06). B) Isotype control. C) Mock transfected 293T cells stained with NN-Ab06. D) Bronchoalveolar lavage specimen stained with NN-Ab06 showing prominent dark staining of cells with enlarged

Figure 1. WU polyomavirus antigen in bronchoalveolar lavage specimens from lungs transplanted into a recipient (28-year-old woman) with Job syndrome. Immunohistochemical analysis of 293T cells transfected with pDEST26-WU–virus protein 1 and stained as...

Cells with prominent dark staining were seen (Figure 1, panel A). A serial section of the same cell block stained with an isotype-matched antibody (#557351, mouse IgG2b: BD Biosciences, San Jose, CA, USA) (Figure 1, panel B) and mock transfected cells stained with NN-Ab06 (Figure 1, panel C) showed negative results. Western blotting was performed as an independent means of evaluating specificity of NN-Ab06 (11). NN-Ab06 reacted with WU-VP1 protein lysate but not with KI-VP1 lysate, which is the most closely related virus to WUPyV. KI-VP1 has 65% amino acid identity with WU-VP1.

We applied the WU-VP1 IHC assay to formalin-fixed, paraffin-embedded sections of the BAL sample. Prominent dark staining of cells with enlarged nuclei and a ground glass appearance characteristic of viral cytopathic changes were observed (Figure 1, panel D). Staining was not seen in serial sections stained with the isotype antibody (Figure 1, panel E) or with no antibodies.

Figure 2

Thumbnail of WU polyomavirus antigen in respiratory epithelial cells from lungs transplanted into a recipient (28-year-old woman) with Job syndrome. Immunofluorescence of 293T cells transfected with pDEST26-WU–virus protein 1 and stained with A) WU virus protein 1 polyclonal antibody (NN-Ab01) or B) preimmune serum. C) Double immunofluorescence with NN-Ab01 (red) and a monoclonal antibody against cytokeratin (green) showing a double-positive cell from the bronchoalveolar lavage specimen. D) Bron

Figure 2. WU polyomavirus antigen in respiratory epithelial cells from lungs transplanted into a recipient (28-year-old woman) with Job syndrome. Immunofluorescence of 293T cells transfected with pDEST26-WU–virus protein 1 and stained with A)...

Many WUPyV-positive cells were cuboidal to columnar and showed other morphologic features consistent with respiratory epithelial cells. To determine their etiology, we developed a double immunofluorescence (dIF) assay with a polyclonal antibody against WU-VP1 (2), designated NN-Ab01, and a monoclonal antibody against cytokeratins (#M3515; Dako, Carpinteria, CA, USA). Deparaffinization and antigen retrieval were accomplished as noted above, and sections were blocked in Superblock T20 (#37516; Thermo Scientific, Waltham, MA, USA). To validate the assay, we performed immunofluorescence analysis with NN-Ab01 on positive control 293T cells expressing WU-VP1. The nucleus was counterstained with Hoechst (#H21491; Life Technologies). Several WU-VP1-positive cells were observed (Figure 2, panel A); a serial section stained with preimmune serum at the same dilution showed a negative result (Figure 2, panel B).

For dIF, BAL sections were incubated first with the primary antibodies and then with fluorescently labeled secondary antibodies (#A10042 anti-rabbit-568 and #A10042 anti-mouse-488; Life Technologies). We observed cells positive for WU-VP1 and cytokeratin (Figure 2, panels C, D), which identified these cells as epithelial cells. Of the 136 WU-VP1-positive cells, 77 (57%) were also cytokeratin positive. A serial section of the BAL sample stained with an isotype-matched antibody to the cytokeratin antibody (#555746 mouse IgG1; BD Biosciences) and preimmune rabbit serum was negative.

We hypothesized that the remaining 43% of WU-VP1-positive, cytokeratin-negative cells might be macrophages. However, a dIF assay using NN-Ab01 and an antibody against CD68 (#M0814; Dako), a macrophage marker, showed WU-VP1 and CD68 single-positive cells but no double-positive cells. In addition, a stain with NN-Ab01 and an antibody against CD45 (#M351529–2; Dako), a marker for hematopoietic cells, also showed negative results.


Before this study, to our knowledge, no specific cell type had been identified as susceptible to WUPyV infection. We found that WUPyV antigen was detected in human respiratory epithelial cells. The presence of nuclease-resistant viral DNA from the Optiprep gradient and detection of WU-VP1, which is believed to be expressed concomitantly with DNA replication (12), suggests that the cells were infected by WUPyV and that the WUPyV life cycle reached at least the stage of late gene expression. The clinical role of infection by WUPyV is uncertain, given that the patient was not experiencing any recognizable symptoms. Although we attempted to identify a second population of WU-VP1-positive, cytokeratin-negative cells, the etiologic features of these cells remains uncertain.

Our patient had Job syndrome, a primary immunodeficiency not previously associated with polyomavirus susceptibility. It is possible that immunosuppressant medications, which include prednisone and tacrolimus, altered susceptibility to virus infection. Other human polyomaviruses are believed to exclusively cause disease in immunocompromised hosts. This case suggests that immunosuppression might also play a role in WUPyV infection and expands our understanding of WUPyV biology.

Ms. Siebrasse is a graduate student at Washington University, St. Louis, Missouri. Her research interests focus on discovery and characterization of novel polyomaviruses.



We thank Kenneth N. Olivier and Erika Crouch for help with interpretation of the slides, Peter C. FitzGerald for assistance with the bioinformatics analysis, and Patti Fetsch for immunocytochemical staining of SV40.

Experimental support was provided by the Hybridoma Facility of the Rheumatic Diseases Core Center. This study was supported by the National Institute of Arthritis and Musculoskeletal and Skin Diseases, NIH (award no. P30AR048335); the Division of Intramural Research, National Institute of Allergy and Infectious Diseases, NIH; grant R21AI095922 to D.W.; the Children’s Discovery Institute at Washington University in St. Louis; and the NIH Intramural Research Program, with support from the Center for Cancer Research and National Institute of Allergy and Infectious Diseases. E.A.S. was supported by the Department of Defense through the National Defense Science and Engineering Graduate Fellowship Program.



  1. Gaynor  AM, Nissen  MD, Whiley  DM, Mackay  IM, Lambert  SB, Wu  G, Identification of a novel polyomavirus from patients with acute respiratory tract infections. PLoS Pathog. 2007;3:e64 . DOIPubMedGoogle Scholar
  2. Nguyen  NL, Le  BM, Wang  D. Serologic evidence of frequent human infection with WU and KI polyomaviruses. Emerg Infect Dis. 2009;15:1199205 . DOIPubMedGoogle Scholar
  3. Kean  JM, Rao  S, Wang  M, Garcea  RL. Seroepidemiology of human polyomaviruses. PLoS Pathog. 2009;5:e1000363. DOIPubMedGoogle Scholar
  4. Neske  F, Prifert  C, Scheiner  B, Ewald  M, Schubert  J, Opitz  A, High prevalence of antibodies against polyomavirus WU, polyomavirus KI, and human bocavirus in German blood donors. BMC Infect Dis. 2010;10:215. DOIPubMedGoogle Scholar
  5. Babakir-Mina  M, Ciccozzi  M, Perno  CF, Ciotti  M. The novel KI, WU, MC polyomaviruses: possible human pathogens? New Microbiol. 2011;34:18 .PubMedGoogle Scholar
  6. Knowles  WA. Discovery and epidemiology of the human polyomaviruses BK virus (BKV) and JC virus (JCV). Adv Exp Med Biol. 2006;577:1945. DOIPubMedGoogle Scholar
  7. Kazem  S, van der Meijden  E, Kooijman  S, Rosenberg  AS, Hughey  LC, Browning  JC, Trichodysplasia spinulosa is characterized by active polyomavirus infection. J Clin Virol. 2012;53:22530. DOIPubMedGoogle Scholar
  8. Gjoerup  O, Chang  Y. Update on human polyomaviruses and cancer. Adv Cancer Res. 2010;106:151. DOIPubMedGoogle Scholar
  9. Sowerwine  KJ, Holland  SM, Freeman  AF. Hyper-IgE syndrome update. Ann N Y Acad Sci. 2012;1250:2532. DOIPubMedGoogle Scholar
  10. Schowalter  RM, Pastrana  DV, Pumphrey  KA, Moyer  AL, Buck  CB. Merkel cell polyomavirus and two previously unknown polyomaviruses are chronically shed from human skin. Cell Host Microbe. 2010;7:50915. DOIPubMedGoogle Scholar
  11. Siebrasse  EA, Nguyen  NL, Smith  C, Simmonds  P, Wang  D. Immunohistochemical detection of KI polyomavirus in lung and spleen. Virology. 2014;468–470C:178–184.
  12. White  MK, Safak  M, Khalili  K. Regulation of gene expression in primate polyomaviruses. J Virol. 2009;83:1084656. DOIPubMedGoogle Scholar




Cite This Article

DOI: 10.3201/eid2101.140855

Table of Contents – Volume 21, Number 1—January 2015


Please use the form below to submit correspondence to the authors or contact them at the following address:

David Wang, Department of Molecular Microbiology, Washington University School of Medicine, Campus Box 8230, 660 S. Euclid Ave, St. Louis, MO 63110, USA

Send To

10000 character(s) remaining.


Page created: December 19, 2014
Page updated: December 19, 2014
Page reviewed: December 19, 2014
The conclusions, findings, and opinions expressed by authors contributing to this journal do not necessarily reflect the official position of the U.S. Department of Health and Human Services, the Public Health Service, the Centers for Disease Control and Prevention, or the authors' affiliated institutions. Use of trade names is for identification only and does not imply endorsement by any of the groups named above.