- Research Article
- Open Access
TH2-like Chemokine Patterns Correlate with Disease Severity in Patients with Recurrent Respiratory Papillomatosis
© The Author(s) 2012
- Received: 16 July 2012
- Accepted: 20 September 2012
- Published: 20 September 2012
Recurrent respiratory papillomatosis (RRP), characterized by the recurrent growth of benign tumors of the respiratory tract, is caused by infection with human papillomavirus (HPV), predominantly types 6 and 11. Surgical removal of these lesions can be required as frequently as every 3 to 4 wks to maintain a patent airway. There is no approved medical treatment for this disease. In this study, we have characterized the TH2-like chemokine profile (CCL17, CCL18, CCL20, CCL22) in patients with RRP and asked whether it was modulated in patients who had achieved significant clinical improvement. CCL17, CCL18 and CCL22 messenger RNAs (mRNAs) were increased in papillomas compared with clinically normal laryngeal epithelium of the RRP patients. Overall, CCL20 mRNA expression was not increased, but there was intense, selective CCL20 protein expression in the basal layer of the papillomas. Patients with RRP expressed more CCL17 (p = 0.003), CCL18 (p = 0.0003), and CCL22 (p = 0.007) in their plasma than controls. Plasma CCL18 decreased over time in three patients enrolled in a pilot clinical trial of celecoxib, and the decrease occurred in conjunction with clinical improvement. There was a significant correlation between sustained clinical remission in additional patients with RRP and reduced levels of CCL17 (p = 0.01), CCL22 (p = 0.002) and CCL18 (p = 0.05). Thus, the change in expression of these three plasma TH2-like chemokines may, with future studies, prove to serve as a useful biomarker for predicting disease prognosis.
Recurrent respiratory papillomatosis (RRP), characterized by the recurrent growth of premalignant tumors of the upper respiratory tract, is caused by infection with human papillomavirus (HPV), predominantly types 6 and 11. Extension into the lower airway occurs in approximately 17% of patients (1,2). Malignant conversion occurs in approximately 3% of patients with RRP (3,4), and is much more likely in those with pulmonary involvement. Recurrence frequency is variable between patients, but relatively constant within most patients (5). In severe disease, surgical removal of the lesions can be required as frequently as every 3 to 4 wks, leading to a lifetime requirement of greater than 150 surgical procedures to maintain a patent airway. There is no approved medical treatment for this disease.
We reported previously that RRP is characterized by a biased adaptive immune response, with a TH2-like predominance (6–8). Both IL-10 and IL-4 are upregulated in papillomas and in peripheral blood mononuclear cells exposed to HPV-11 E6 protein, and the tissues and cells express a concomitant decrease in IFN-Y, IL-12 and IL-18 (7). However, the immunologic mechanism(s) that governs the variation in disease severity and the TH2-like bias to HPVs remains unresolved. Of note, 6.9% of men and women aged 14 to 69 have oral or airway HPV infection (9) yet the vast majority of these individuals never develop RRP. The incidence in the United States among children (under age 14) is estimated to be 4.3/100,000 (10) and among adults, 1.8/100,000 (11). This suggests that the HPV-specific, TH2-like bias may be unique to these patients.
Toward understanding the immune mechanism(s) that prevents patients with RRP from clearing or controlling their HPV infection, we previously performed a paired messenger RNA (mRNA) microarray study that characterized the repertoires of genes expressed in papillomas versus those expressed by autologous clinically normal laryngeal tissues (6). Among the results was evidence that there was differential chemokine mRNA expression by the papilloma tissues, which suggested that the virus might be able to polarize the patients’ innate immune responses. Chemokines elicit and guide leukocyte movement, support angiogenesis (12) and participate in the balance of TH1-like versus TH2-like responses maintained by macrophages (13,14). We had also previously identified a robust expression of cyclooxygenase-2 (COX2) and its downstream product prostaglandin E2 (PGE2) throughout the airway tissues of patients with RRP compared with controls, mediated by constitutive activation of the EGFR/Rac1 pathway (15). PGE2 can bias the adaptive immune response away from an effective TH1-like pattern (16), and can enhance expression of TH2-like chemokines by innate immunocytes (16,17). Therefore, both viral and host factors could modulate the innate response in these patients.
In this study, we have characterized the TH2-like chemokine profile in patients with RRP, asked whether the profile correlated with disease severity, and asked whether that profile changed when severity changed. We found an elevated TH2/TH1-like chemokine balance in patients with RRP that correlated with disease severity. The inducible TH2-like chemokine CCL20 was expressed selectively in the basal keratinocyte layer of papillomas, where infiltrating immunocytes would first gain access to HPV antigen-expressing cells. We also found that plasma levels of the TH2-like chemokines CCL17, CCL18 and CCL22 were reduced in concert with sustained clinical remission.
Studies were approved by the North Shore-LIJ Health System Institutional Review Board. Biopsies were collected of papilloma and autologous clinically normal airway epithelium (adjacent tissue) from patients with RRP and from control airway tissues from patients without RRP undergoing surgery at Long Island Jewish Medical Center. Blood was drawn prior to induction of anesthesia. Disease severity scores were calculated as described previously (5,18) and classified as either mild/moderate (score <0.06), or severe (score >0.06 or tracheal involvement). Severity has been associated previously with altered immunologic responses in RRP, while age of disease onset, gender, or infection with HPV6 versus HPV11 has not correlated (7,8).
Design of the double-blinded placebo-controlled celecoxib studies for treatment of RRP has been described previously (15). Briefly, patients are randomized to either drug or placebo for 1 year and then switched to the other drug for a second year. The pilot study has been completed, and the blind broken. The Phase IIb trial (https://doi.org/ClinicalTrials.gov identifier NCT00571701) (19) is ongoing and the blind has not been broken. At the time of this study, 38 patients were enrolled, 23 patients had sufficient clinical data to assess changes in disease status, and seven were free of disease for at least two 3-month intervals. Multiple plasma samples, at irregular intervals, were obtained from the three patients enrolled in the pilot study. Plasma samples were obtained at regular 3-month intervals in the Phase IIb study. All samples were stored at −80°C. TH2-like chemokine levels in plasma samples were measured as described below.
Real-time PCR primers and probes.
Sense primer (5′ → 5′)
Antisense primer (5′ → 5′)
Eight-µm sections of paraffin blocks of papillomas and “adjacent” normal laryngeal epithelium were obtained from five patients with severe RRP, processed using standard methods and stained to identify the location of CCL18 and CCL20. Briefly, sections were incubated with either anti-CCL18 polyclonal goat-biotin or anti-CCL20 polyclonal goat-biotin antibodies (R&D Systems, Minneapolis, MN, USA; 1:50 dilution), and detected with Streptavidin-Cy3-conjugated secondary anti-biotin antibodies (Jackson ImmunoResearch Laboratories Inc., West Grove, PA, USA; 1:200 dilution). Slides were mounted with UltraCruz Mounting medium (Santa Cruz Biotechnology Inc, Santa Cruz, CA, USA), observed through a Zeiss Axiovert 200M-inverted microscope, images analyzed using the AxioVision V4.7.2 software (Carl Zeiss Microscopy LLC, Thornwood, NY, USA), and pseudocolor images produced with ImageJ 1.46o (NIH, Bethesda, MD, USA; https://doi.org/rsb.info.nih.gov/ij/) and Photoshop 7.0 (Adobe, San Jose, CA, USA) software.
Enzyme-Linked Immunosorbent Assay (ELISA)
Chemokines were measured in the plasma of RRP patients and controls by DuoSet (CCL18) or Quantikine (CCL17, CCL20, CCL21 or CCL22) ELISA (R&D Systems) according to the manufacturer’s directions.
Chemokines were measured in plasma from the subset of patients enrolled in the Phase IIb celecoxib trial with a highly sensitive, customizable, multiplex, cytokine/chemokine array (Aushon Biosystems, Billings, MA, USA) (39). All assays were performed by the vendor in duplicate each time, on at least two different runs, to validate this assay.
Descriptive statistics and analysis of variance (ANOVA) were performed with InStat 3.01 (GraphPad Software, San Diego, CA, USA). Plasma chemokine levels were compared by a nonparametric ANOVA, Kruskal-Wallis test. Chemokine multiplex ELISA data from those patients in the Phase IIb clinical trial who achieved remission for at least two successive 3-month intervals (n = 7) were analyzed via mixed model repeated measures (MMRM) analyses, using SAS 9.1 (SAS Institute, Cary, NC, USA), where each of the chemokines (CCL17, CCL18 or CCL22) was modeled as a function of time, with the severity score group (mild/moderate versus severe) serving as a time-dependent covariate. Data was assumed to have compound symmetry covariance structure, and was validated with several other covariance structures. Model estimation was performed using restricted maximum likelihood (REML), and balanced design was determined using the Kenward-Roger method (40) to calculate fixed effects and degrees of freedom. The variance-covariance matrix was used to determine the correlation between the relative number of days since clinical remission, the disease score and a given chemokine. To correlate CCL18 plasma levels to sustainability of remission, a 2 × 2 contingency table was constructed containing: a) the number of patients from the two clinical trials that did/did not maintain a downward slope in CCL18 expression after achieving clinical remission, as defined above; and b) the number of patients that did/did not maintain a sustained clinical remission. This contingency table was analyzed by Fisher exact test.
Chemokine Expression by Laryngeal Tissues from RRP Patients and Controls
Surprisingly, expression of the TH2-like chemokines CCL17 and CCL18 was markedly reduced in “adjacent” tissue of patients compared with control “true normal” tissues, while CCL20 and CCL22 levels were essentially comparable (Figure 1). This suggests that laryngeal tissues of RRP patients may be polarized away from expressing at least some TH2-like chemokines, and also that the constitutive expression of PGE2 does not induce chemokine expression by laryngeal keratinocytes. In contrast, active HPV infection in the papillomas increased the levels of CCL17 and CCL22 markedly and possibly increased the level of CCL18, counteracting the anti-TH2 bias. CCL20 mRNA levels were not increased. The expression of the TH1 chemokine CCL19 was reduced markedly in papillomas compared with adjacent tissues from RRP patients and normal tissues from controls. Expression of CCL21, another TH1-like chemokine, was not detectable in any of the tissues (data not shown). The net effect of these results suggests that active HPV infection shifts the local TH1/TH2-like chemokine balance toward a TH2-like state in RRP patients.
Localization of TH2-like Chemokine Expression in Papillomas
TH2-like Chemokines Are Enriched in the Plasma of RRP Patients, and Levels Correlate with Disease Severity
Change in Disease Severity Modulates Systemic TH2-like Chemokine Expression
Relationship between chemokine pattern and sustained clinical response.
Slope of CCL17b
Slope of CCL22b
Slope of CCL18b
Sustained clinical response
Pt # 3
+ + +
+ + +
+ + +
Pt # 5
+ + +
+ + +
+ + +
Pt # 2
Pt # 6
Pt # 1
Pt # 7
Pt # 4
Chemokines have multiple functions. They attract leukocytes to sites of inflammation, regulate leukocyte homing, and have a role in angiogenesis and tumor growth (44). RRP is a virally induced disease characterized by growth of premalignant tumors, with an apparent failure of the host immune system to control the infection. We have found that the pattern of expression of TH1-like and TH2-like chemokines in patients with RRP paralleled the increased TH2-like cytokine milieu that we have shown previously (7,8,45). We also found that changes in chemokine expression correlated with change in disease severity, consistent with the hypothesis that chemokines play a role in the HPV-specific immune dysregulation of this disease.
Comparison of papilloma tissues to autologous clinically normal airway tissues as well as to tissues from controls with no history of RRP enabled us to ask which chemokine differences were driven by the papillomavirus infection and which were a reflection of the patient’s local or systemic immune status that might impact on susceptibility to HPV-induced disease. One caveat to this approach is the fact that latent HPV infection is widespread in the airway of patients with RRP, and we cannot exclude the possibility that the latent infection affects chemokine expression, even though viral expression is essentially undetectable in latency (42).
Keratinocytes are known to express many of the same cytokines and chemokines as immunocytes (46), although the regulation of expression has not been studied as extensively in keratinocytes. Expression of the TH2-like chemokines CCL17 and CCL22 was increased significantly in papilloma tissues compared to autologous clinically normal tissues (Figure 1). The TH2-like cytokines IL-4 and IL-13, which we reported previously are increased in papillomas (7,47), are potent stimulators of CCL22 expression by monocytes (48–50) while the TH1-like cytokine IFN-γ (absent in papillomas) suppresses CCL22 expression by monocytes, macrophages and dendritic cells (DCs) (49). CCL17 is expressed by alternatively activated macrophages (AAMϕs) and DCs, and the same TH2-like cytokines that induce CCL22 expression promote generation of AAMϕs (51). Others have suggested that elevated COX-2 expression leads to an overexpression of CCL20 through a PLCP1/PKCα/MEK1/2/ERK1/2-dependent pathway (52) and that alterations in the COX2/PGES/PGE2 pathway affect TH2-like chemokine expression (53,54). However, PGE2 does not appear to have the same effect on laryngeal keratinocytes, since concentrations of PGE2 in papilloma and clinically normal airway tissues of RRP patients are quite comparable (data not shown).
CCL18, a highly abundant and constitutively expressed chemokine in normal plasma (22,55–58), is expressed by many innate immunocytes including DCs (13,59), AAMϕs (13) and eosinophils (60). CCL18 is expressed prominently in asthma and other TH2 disorders (54,60). Thus, it was surprising that we did not see a marked increase in CCL18 in the papilloma tissues. The vast majority of mRNA analyzed from the tissues is derived from the epithelial cells, not innate or adaptive immune system cells. Thus, even though we saw some cells in some papillomas that were strongly positive by immunohistochemistry (Figure 2A), the CCL18 mRNA would be diluted by the large amount of mRNA extracted from negative papilloma cells. It appears that the virus, the microenvironment in the tissues, or both acting together, stimulate papilloma cells to upregulate expression of CCL17 and CCL22, but not CCL18.
TH2-like chemokines are important chemoattractants that guide TH2-like cells and regulatory T cells (Tregs) to sites of inflammation (61) through their interaction with CCR4 (48,62). Increased expression of CCL17 and CCL22 could be the mechanism for our previous finding that Tregs are enriched in papillomas (61). CCL22 is also a potent chemoattractant for DCs and natural killer (NK) cells (63–65), which are more abundant in papillomas (47,66). CCL20 mRNA levels did not appear to be upregulated in papillomas when analyzing total biopsy extracts, but the protein was clearly upregulated differentially in the basal layer of this stratified squamous epithelium (Figure 2C). CCL20 is an inducible chemokine that acts as a chemoattractant for NK cells (67) and immature DCs (24), and plays an important role in recruitment and activation of TH2-like T cells. Basal cells are immediately adjacent to the basement membrane, thus CCL20 expression in these cells would form a strategic barrier to selectively admit TH2-like, but not TH1-like, T cells into the tissue. This would restrict access to the more suprabasal and spinous layer of keratinocytes where highlevel HPV expression occurs in papillomas (Figures 2E,F) (1).
Plasma chemokine levels reflect a more systemic immune state of the RRP patients than analysis of laryngeal biopsy tissues. Plasma levels of CCL17 and CCL22 were clearly elevated in the RRP patients, in keeping with the papilloma tissue levels, but so was CCL18 (Figure 3). This disconnect suggests that the highly elevated plasma CCL18 levels in these patients are derived from another site, possibly lymphoid tissues. While the role of CCL18 has been debated, strong evidence supports CCL18 as an antiinflammatory chemokine (22,54,60,68). Thus, we conclude that RRP is indeed a TH2-like chemokine disease with a strong bias away from effective control of HPV infection, and that the bias correlates with disease severity.
The systemic TH2-like chemokine bias in these patients is not “hard wired,” since plasma levels changed when disease severity improved.
On the basis of the first clinical study (15), we would conclude that celecoxib therapy induces both clinical response and reduction in CCL18 plasma levels and that CCL18 levels reflect clinical state rather than regulation by PGE2 since initiation of treatment and clinical improvement clearly preceded the decline in chemokine expression to baseline for two of the three patients (Figure 4). Expansion of this research using seven patients from our current celecoxib study provided additional insights (Figure 5). There was a highly significant correlation between achievement of clinical remission and decline in plasma CCL17 and CCL22 levels, but not CCL18 levels. Rather, a sustained decline in CCL18 levels appeared to predict continued remission (Table 2). We postulate that immunologic events that contribute to clinical improvement involve modulation of the expression of CCL17 and CCL22, and that changes in CCL18 reflect the likelihood of sustaining the improvement. Monitoring plasma levels of the three TH2-like cytokines (CCL17, CCL22 and CCL18) may, with further study, prove to be a useful tool for predicting disease prognosis in RRP.
BM Steinberg has a research grant of celecoxib and matching placebo from Pfizer for the clinical studies.
This work was supported by grants R01DE017227 from the National Institute of Dental and Craniofacial Research (VRB) and U01DC007946 from the National Institute on Deafness and Other Communication Disorders (BMS and ALA), National Institutes of Health. The authors thank Nick Agostino for assistance with some of the ELISA assays, and Helena Schmidt-mayerova for her assistance in the initial CCL18 ELISAs. We thank Virginia Mullooly for coordinating the collection of patient samples, the residents from the Department of Otolaryngology and the attendings and residents from the Department of Anesthesiology for their assistance. Assistance with statistical analysis was provided by Martin Lesser and Jonathan Levine.
Figures 2E and F were reprinted with the permission of the publisher from Steinberg BM, Gallagher T, Stoler M, Abramson AL. (1988) Persistence and expression of human papillomavirus during interferon therapy. Arch Otolaryngol. Head Neck Surg. 114:27–32.
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