- Open Access
Th17 responses are not altered by natural exposure to seasonal allergens in pollen-sensitive patients
Allergy, Asthma & Clinical Immunology volume 12, Article number: 55 (2016)
Allergic rhinitis affects 10–30 % of the global population and this number is likely to increase in the forthcoming years. Moreover, it commonly co-exists with allergic asthma as a chronic allergic respiratory syndrome. While the involvement of Th2 cells in allergy is well understood, alterations of pro-inflammatory Th17 responses remain poorly characterized. The aim of our study was to determine whether natural seasonal allergen exposure causes changes in T cell subset characteristics in patients with allergic rhinitis and asthma.
Sixteen patients with allergic rhinitis/atopic asthma (9M, 7F; age 31.8 ± 12.1) and 16 healthy controls were recruited into the study (9M, 7F; age 31.2 ± 5.3). Blood samples were collected from the patients 1–3 months before pollen season (visit 1), within 7 days of the appearance of pollen/initiation of allergic symptoms (visit 2) and 2 weeks after visit 2 following the introduction of symptomatic treatment with antihistamines (visit 3). Flow cytometry was used to assess major T cell subsets (naïve, central memory, effector memory and CD45RA+ effector) and key T cell cytokine production (IFNγ, IL-17A, TNF and IL-4) using intracellular staining. Data were analyzed using repeated measures ANOVA and paired t test.
As expected, an increase in the percentage of IL‐4+ CD4+ cells was observed during natural pollen exposure in patients with allergic respiratory syndrome. No significant changes were observed in the production of other cytokines, including Th17 cells, which tended to be lower than in the control population but unchanged during pollen exposure. Introduction of antihistamine treatment led to only moderate changes in cytokine production from CD4 and CD8 T cells. Selective changes in CD8+ T cells were observed during natural pollen exposure including a decrease in transient cells (with features of CD45RA+ and CD45RO+ cells) and a decrease in the percentage of central memory cells in the peripheral circulation. Within the CD4 cell group the total percentage of CD45RA positive CD4 cells was increased during pollen exposure.
Th1 and Th17 responses are not altered during pollen season but allergen exposure affects T cell activation and memory cell status in patients with allergic respiratory syndrome.
Allergic rhinitis affects 10–30 % of the global population  and it seems that economic growth and industrialization will only serve to increase this number, not only due to changes in the living environment , but also due to expansion of allergic plants caused by increased carbon dioxide concentration in the air . In the Polish population, clinicians diagnose allergic rhinitis in 30.6 % of adults. Among Polish young adults, 16.7 % suffer from seasonal allergic rhinitis , which is most frequently caused by allergens such as pollens from trees and grass.
Symptoms of allergic rhinitis and allergic asthma often coexist and it is postulated that they represent a response to the same allergen from upper and lower airways, together named chronic allergic respiratory syndrome . The same inflammatory response is observed in nasal mucosa of patients with allergic rhinitis and bronchial mucosa of patients with asthma. In both of these situations, infiltration by Th2 cells is present .
Allergen presentation causes differentiation of T cells into Th2 cells, which produce cytokines stimulating B cells to produce IgE antibodies. These antibodies bind to mast cells and allergens causing a release of mediators, such as histamine, which are responsible for the symptoms of allergic rhinitis. T cells also take part in the recruitment of eosinophils into the inflammatory site and development of the late phase of allergic reaction . In the allergic reaction Th17 may also play a significant role . Although an increased serum level of IL-17 in allergic patients has been described in many studies [8, 9], less is known about changes in Th17 cells caused by natural seasonal allergen exposure. Systemic reaction caused by contact with allergen has been widely investigated in many studies, however, the immunological mechanisms leading to primary and secondary responses still remain unclear.
T cells appear to be strongly involved in this process and its subsets may differ depending on antigen stimulation. The CD45RA marker is characteristic for naïve cells, which proliferate when stimulated with antigens, while the presence of CD45RO is characteristic for memory cells, which proliferate during re-call antigen stimulation . Expression of C–C chemokine receptor type 7 (CCR7, CD197) on memory T cells enables distinguishing of central memory T cells (CD45RA− CCR7+), which are able to migrate to the lymph nodes and stimulate dendritic cells, from effector memory T cells (CD45RA− CCR7−), which possess effector functions and can migrate to the inflammatory site . Transcriptional activation of dendritic cells caused by interaction with memory T cells and increased T cell proliferation after culturing with allergen-stimulated dendritic cells in patients suffering from allergic rhinitis has been described by Larsson et al. . After secondary stimulation, central memory T cells lose their CCR7 receptor and acquire effector function becoming effector memory T cells .
Although a primary study  described the presence of a CD45RA+ effector cell population (CD45RA+ CCR7−) of CD8 cells and lack of this population among a pool of CD4 cells, a newer study revealed the presence of a CD4+ CD45RA+ CCR7− population, which is the most differentiated type . It has been shown that percentages of these cell subsets may differ depending on antigen persistence and load .
Allergen-specific naïve and memory T cells differ in allergic and in healthy patients . Changes are also observed depending on whether stimulation is caused by perennial or seasonal allergen. Dust mite-specific cells from mite-allergic patients are mostly of the central memory phenotype, while specific T cells from birch pollen-allergic patients have features of effector memory cells .
Several studies have described changes of CD45RO/RA cells in patients with seasonal allergies [16–19], however, less is known about changes in central memory and effector memory cell subsets in these patients. In particular, studies describing the changes caused by pollen exposure in T cell subpopulations of patients suffering from allergic rhinitis are required. Interestingly, expression of surface antigens CCR4, CXCR1 and CD62L on memory cells increases during pollen season only in symptomatic atopic patients, explaining the lack of symptoms in patients with asymptomatic skin sensitization and healthy controls .
The aim of our study was to determine whether natural seasonal allergen exposure causes changes in the percentage and immunological status of T cell subsets in patients with allergic respiratory syndrome. To further characterize activation of T cells in this condition, production of cytokines by these cells was assessed.
Sixteen adult patients with at least a 1 year-long history of pollen allergy manifested by allergic rhinitis or atopic asthma were recruited into the study (Table 1). Allergy was previously confirmed by skin prick tests and by the presence of specific IgE. Patients involved in the study did not present with symptoms at the beginning of the study. If patients suffered from asthma, the disease had to be well controlled prior to participation in the study. At the beginning of the observation, patients were not taking any antihistamines, although they were permitted to use inhaled glucocorticosteroids or inhaled β2-mimetics. If a patient had been taking antihistamines prior to the study, treatment was discontinued for at least 2 months before the beginning of observations.
Patients with symptoms of perennial allergy or with concomitant allergy to other seasonal allergens with overlapping time of symptom occurrence were excluded from the study. Those suffering from chronic or inflammatory diseases or undergoing immunotherapy within the past 3 years were also excluded.
Blood samples were collected three times from all patients within 1 year: before allergy season (visit 1), during allergy season immediately following the appearance of symptoms (visit 2) and 2 weeks after the appearance of symptoms (visit 3). At the onset of symptoms (visit 2), after blood sample collection, all patients were started on treatment with new antihistamines. Treatment was discontinued after symptoms subsided.
In the period of high pollen concentration, blood samples collected from 16 healthy controls with no history of allergy, with negative skin prick tests for pollens, not taking steroids, antihistamines, β2-mimetic nor montelukast, were also examined (Table 1). Investigation protocol was approved by the Jagiellonian University Bioethics Committee, Cracow, Poland (KBET/249/B/2012). Written consent was obtained from all subjects prior to enrollment in the study.
Blood sample collection
Blood samples were collected from patients into ethylenediaminetetraacetic acid (EDTA) tubes. Whole blood was centrifuged to separate plasma, then peripheral blood mononuclear cells (PBMC) were isolated from the blood by standard gradient centrifugation on Lymphocyte Separation Medium (LSM) 1077 (PAA Laboratories GmbH, Austria).
Isolated cells were washed twice with a solution of phosphate-buffered saline (PBS) with 1 % heat inactivated fetal bovine serum (FBS) from Gibco (Life Technologies, USA) and suspended in this buffer. The amount of PBMC was estimated using a Fuchs-Rosenthal chamber. 5 × 105 cells were stained with monoclonal antibodies: anti-CD3–PerCP (Clone SK7), anti-CD4–APC (Clone SK3), anti-CD8–APC-H7 (Clone SK1), anti-CD45 RO–PE (Clone UCHL1), anti-CD45 RA–FITC (Clone L48), anti-CCR7(CD197)–PE-Cy7 (Clone 3D12) from BD Biosciences (San Jose, CA, USA). After staining for 20 min in the dark at 4 °C, cells were washed with PBS+ 1 %FBS and suspended in 200 μl of this buffer. These prepared cells were collected using a FACS Canto II flow cytometer from BD Biosciences (San Jose, CA, USA). Data were analyzed using Flow Jo v10 (Ashland, OR, USA). First, lymphocytes were gated based on forward-scattered and side-scattered light (FSC/SSC). Next, the population of CD3+ cells (T cells) was selected. Among this group, subpopulations of CD4+ and CD8+ T cells were separated (Additional file 1: Fig. S1a). On CD3+, CD4+ and CD8+ cells presence of CD45RA and CD45RO marker was assessed. T cell subpopulations were also analyzed for presence of naïve (CD45RA+ CCR7+), central memory (CD45RA−CCR7+), effector memory (CD45RA−CCR7−) and CD45RA+ effector (CD45RA+ CCR7−) cells.
Assessment of intracellular cytokines
1 × 106 PBMC were suspended in RPMI 1600 medium (Gibco, Life Technologies, USA) with 10 % FBS, 200 mM l-glutamine and 5 mg/ml gentamicin (Sigma–Aldrich, Saint Louis, MO, USA) and cultured with Leukocyte Activation Cocktail with BD Golgi Plug from BD Biosciences (San Jose, CA, USA) for 4 h at 37 °C in a 5 % CO2 humidified atmosphere. After this time, cells were washed with PBS+ 1 %FBS and stained with monoclonal antibodies anti-CD3–PerCP (Clone SK7), anti-CD4–APC (Clone RPA-T4), anti-CD8–APC-H7 (Clone SK1) from BD Biosciences (San Jose, CA, USA). Next, cells were washed with PBS+ 1 %FBS and suspended in Fixation/Permeabilization Solution (BD Biosciences, San Diego, CA, USA). After permeabilization, cells were washed with Perm/Wash/Buffer (BD Biosciences, San Diego, CA, USA) and stained with monoclonal antibodies: anti-IFNγ–FITC (Clone B27), anti-IL-17A–PE (Clone N49-653), anti-TNF–FITC (Clone MAb11) and anti-IL-4–PE (Clone 8D4-8). In some cases, isotype controls: IgG1 κ–FITC (Clone MOPC-21) for IFNγ and TNF, IgG1κ–PE (Clone MOPC-21) for IL-17A and IL-4 were used (BD Biosciences, San Jose, CA, USA). All staining and permeabilization were performed for 20 min in the dark at 4 °C. After intracellular staining, cells were washed with Perm/Wash Buffer, suspended in PBS+ 1 %FBS and collected using a FACS Canto II flow cytometer from BD Biosciences (San Jose, CA, USA).
The Shapiro–Wilk test was used to test normality of distribution of all analyzed variables. Repeated measures ANOVA was used to test the difference in specific T lymphocyte subpopulations between three visits studied. Subpopulations that significantly differed between three visits were further chosen for paired tests, comparing two visits as well as tests comparing a single visit of study and control groups using t test. All tests were performed in IBM SPSS Statistics (ver. 23). Results are presented as mean ± SEM. P values <0.05 were considered as significant.
Intracellular cytokine production
Influence of seasonal allergen exposure on cytokine production was assessed by intracellular staining of IL-4, TNF, IFNγ and IL-17A. A significant increase in IL-4 was observed in CD4+ cells during pollen season (1.0 vs 2.1 vs 2.0 %) (Fig. 1a). There were no changes in the percentages of TNF+ nor IFNγ+ T cells during the visits (Fig. 1a and b). IL-17A was produced by CD4 cells in very small amounts and did not change significantly during pollen season (Fig. 1a).
Next, to ascertain activation of the immune system caused by seasonal allergens, expression of CD45RA and CD45RO markers in CD4+ and CD8+ cells was investigated (Fig. 2a). The percentage of CD4+ CD45RA positive cells increased in allergic patients during pollen season from 40.8 % at the beginning of pollen season to 43.7 % 2 weeks after onset of symptoms (P = 0.03) (Fig. 2b). Among CD8 cells, a decrease in transient cells during pollen season was observed at the beginning of pollen season (15.0 %) and 2 weeks from the onset of symptoms (15.5 %) in comparison to before pollen season (17.7 %) (V1–V2 P = 0.01; V1–V3 P = 0.03) (Fig. 1c). In all three groups, an increase in the percentage of CD45RO cells at the beginning of pollen season with a decrease 2 weeks later was observed, although only in CD3 cells this trend reached statistical significance (V1—32.8 % vs V2—35.1 % vs V3—32.1 %; P respectively 0.01 and 0.004) (data not shown). There were no differences in the percentage of CD45RA and CD45RO cells between allergic patents and the control group.
Memory Cell Subsets
To investigate the influence of allergen exposure on memory cell subsets we determined percentages of naïve, central memory, effector memory and CD45RA+ effector cells in the group of CD4 and CD8 cells. Allergen exposure did not cause statistically significant changes in the group of CD4 memory cells in pollen-sensitive patients, although an increase in the percentage of CD45RA+ effector cells 2 weeks after the onset of symptoms was close to statistical significance (ANOVA P = 0.06) (Fig. 3a and b). In the group of CD8 cells, a decrease in the percentage of central memory cells was observed during allergen exposure in comparison to the state before pollen season (10.1 vs 8.8 vs 9.1 % P = 0.01) (Fig. 4a and b).
T cell subsets
We also determined whether allergen exposure could influence the percentage of T cells. There were no statistically significant differences observed among percentages of CD4+ and CD8+ neither between visits nor in comparison with the control group (Additional file 1: Fig. S1b). The CD4/CD8 ratio also remained constant in allergic patients before and in the allergy season and did not differ from the control group.
With regard to the increasing number of people suffering from allergies, understanding the mechanisms leading to the complex manifestation of symptoms is important in the search for effective treatment methods. As expected, coexistence of seasonal allergic rhinitis and asthma was observed in more than half of the individuals. Determination of the role of T cells and their subsets in seasonal allergy may be crucial to understanding the mechanism of this reaction.
Natural allergen exposure caused a significant increase in IL-4 production by CD4 cells in pollen-sensitive patients. Our findings confirm the previous observation by Wosinska-Becler et al. describing an increase of IL-4 during the peak of birch season in comparison with non-pollen season in birch-sensitive patients . In this group of patients a decrease in IFNγ production in comparison with alder season was observed, but no significant changes were present when compared with non-pollen season, which is also consistent with our results. A study performed in asthmatic children revealed that the percentage of CD4+ cells producing IL-4 and cells producing IFNγ is higher during acute exacerbations than at convalescence . Another study in children with atopic asthma showed an increase in the percentage of CD4 and CD8 cells producing IL-4 and a decrease in CD4 cells producing IFNγ in comparison with healthy controls, while the percentage of cells producing TNF remained unchanged . In addition, the percentage of CD8 cells producing IL-4 spontaneously was higher in children with asthma in this study. Two other studies comparing patients with asthma and healthy controls did not demonstrate any changes in the percentage of cells producing IL-4. One of these studies reported a lower percentage of CD4 cells producing IFNγ in these patients , while the second study observed a higher percentage of CD4 and CD8 cells producing IFNγ in atopic asthmatic patients . Bias of results showing changes in patients suffering from allergic asthma can be related to the various kinds of allergens that they were sensitive to (i.e. house dust, animals, moulds), while in our study exposition to seasonal allergen was investigated.
Allergen provocation outside of pollen season in patients with asthma resulted in a decrease in IL-4+ CD4+ cells. In this study, changes in the number of IFNγ-producing CD4 cells depended on response type. A decrease in IFNγ-producing CD4 cells was observed in patients who presented only with early reaction to the allergen challenge, without late-phase reaction .
Some studies report an increased percentage of Th17 cells in patients with allergic rhinitis. However, in most of these studies, patients allergic to perennial allergens [27, 28] or sensitive to seasonal and perennial allergens were involved . Another study describes the influence of perennial allergen challenge by nebulization on Th17 cells , however, less is known about changes over time caused by natural seasonal allergen exposure. It was shown that the percentage of IL-17A-producing CD4+ T cells may also depend on polysensitization of the patients and on patient’s sex . Although an increased serum IL-17 level was observed in patients sensitive to perennial allergens, pollen allergens did not cause significant changes .
In our study, we did not observe significant changes in the intracellular production of this cytokine. Our results are in opposition to Ciprandi et al. who describe a higher percentage of Th17 cells in pollen-sensitive allergic rhinitis patients than in the healthy controls, however, the control group in this study was very small and comparison to the state before pollen season was not performed .
Our findings demonstrate the influence of pollen season on memory cells in patients suffering from allergic respiratory syndrome. We did not observe any changes in CD4+ nor CD8+ T cells caused by natural allergen exposure. Our results are consistent with those of Kalrsson et al. who have shown an increase in CD4+ cells in patients suffering from allergic rhinitis during provocation but not during natural antigen exposure . After in vitro stimulation with P. pratense, an increased number of circulating allergen-specific CD4+ T cells was seen. In addition, proliferation of CD4+ cells and in some cases, CD8+ cells was observed in grass pollen allergic patients . In pollen-sensitive patients receptor density also changes throughout the year. In these individuals, Monteseirin et al. observed a decrease in the number of CD4+ receptors per cell in the spring .
Exposure to seasonal allergens affected expression of CD45 RA/RO isoforms in pollen-sensitive patients. We observed an increase in CD4+ CD45RA+ cells 2 weeks from the beginning of allergy season in comparison with the onset of symptoms. These changes were accompanied by a decrease in transient CD8 cells during pollen season. Although presence of the CD45RA marker is characteristic for naïve cells and CD45RO maker for memory cells, re-call antigen stimulated change of CD4 cells from RA+ to RO+ phenotype is a gradual process during which two transitional subsets co-expressing RA and RO are present: CD45RAbright/RObright, which are present in very small amount, and CD45RAdull/ROdull expressing both isoforms at low level, possessing mixed features of CD45RA+ and CD45RO+ cells. Moreover, CD45RO+ cells under certain conditions can re-acquire the RA marker . Cells co-expressing CD45RA and CD45RO have been described in patients with atopic asthma, and these subsets form 31–46 % of the T helper cells . In our study transient cells formed on average, depending on visit, 15.7–16.6 % of CD4 cells and 15.0–17.7 % of CD8 cells in allergen-sensitive patients and did not differ from the control group. In children with allergic asthma an increase in the absolute number of CD8+ T cells expressing CD45RO is associated with a decrease in percentage, but not in the absolute number of CD4+ CD45RO positive cells when compared with healthy controls . We did not observe any differences in the percentage of CD4 and CD8 RO positive cells between allergic patients and the control group. Although we have seen an increase in CD3 cells expressing CD45RO marker at the beginning of allergen season with a decrease 2 weeks later, these changes were not significant either on CD4 or CD8 cells. Similar findings, representing transformation of lymphocytes from naïve into memory type cells caused by contact with allergen, were described previously by Pawlik et al. on CD4 cells, who however, observed an increase in CD4+ 45RO+ lymphocytes in the blood of patients with seasonal symptoms during allergy season . A decrease in the percentage of CD3+ CD45RO+ cells two weeks after the onset of symptoms in our study can be explained by migration of CD45RO+ cells into the inflammatory site . The mechanisms of this process are complex and may include various factors such as oxidative stress, which lead to inflammation .
Investigation of skin biopsies obtained from pollen-allergic patients challenged with intradermal injection of allergen demonstrated increased frequency of memory cells 24 h after challenge in comparison with stimulation with control solution, suggesting a role for these cells in the cutaneous late-phase reaction . Immunocytochemical analysis of nasal mucosa of patients suffering from seasonal allergic rhinitis revealed an increase in CD4+ CD45RO+ cells during pollen season . The presence of activated memory T cells in mucosa was also demonstrated using flow cytometry, however, there were no differences between allergic and non-allergic patients. Moreover, these findings were present only at the inflammatory site and did not correlate with peripheral blood mononuclear cells .
A recent study demonstrated an increased number of effector/memory T cells (CD4+CD25low) in patients with seasonal allergic rhinitis 6 h after nasal allergen challenge with grass pollen. This study described changes in peripheral blood cells, although allergen challenge was induced only once and may not have accurately reflected the changes caused by natural exposure during allergy season . In patients with allergic rhinitis, the response to provocational exposure may be different from the response during pollen season .
We observed a decrease in CD8 central memory cells during pollen season. These changes reflect the differentiation of memory cells in the allergic reaction, with CD45RA+ effector cells being the most differentiated type. A non-significant increase in CD45RA+ effector cell subpopulation of CD4 cells appears 2 weeks after the first presentation of symptoms (visit 3) when compared with the measurement performed at the onset of symptoms (visit 2). This is probably due to the time needed to convert effector memory cells into CD45RA+ effector cells. In this period of time all patients were receiving treatment with new antihistamines, which were shown to be highly effective in relieving symptoms of seasonal allergic rhinitis [45, 46]. This medication was not administered during the previous visit (at the onset of symptoms) and could have also affected our results. Although the influence of H2-blockers on CD4+ RO+ cells and suppressor cells was previously demonstrated , less is known about the influence of new H1-blockers on these cells. However, the effect of the first generation H1-blocker, clemastine, on natural killer and antibody-dependent cellular cytotoxicity activities of lymphocytes have been described .
In summary, our data shows that natural seasonal allergen exposure in patients with allergic respiratory syndrome affects T cell activation and their memory status, without altering Th1 and Th17 responses. Additional studies are required to better understand the complexity of cellular reactions in patients with allergic respiratory syndrome.
C–C chemokine receptor
cluster of differentiation
fetal bovine serum
lymphocyte separation medium
peripheral blood mononuclear cells
tumor necrosis factor
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AS performing flow cytometry measurements, cytometric analysis of acquired data, interpretation of data, preparation of the manuscript, table and figures. BJH study design, patient recruitment and clinical assessment, acquisition of clinical data, revising the manuscript critically for important intellectual content. GO patient recruitment and clinical assessment. GW acquisition of clinical data. MS statistical analysis of data. AS performing flow cytometry measurements. PM performing flow cytometry measurements. JM performing flow cytometry measurements. TS patient recruitment and clinical assessment, revising the manuscript critically for important intellectual content. MCG revising the manuscript critically for important intellectual content. TPM interpretation of data, revising the manuscript critically for important intellectual content, general supervision of the research group. All authors read and approved the final manuscript.
The authors would like to thank Kevin Luc, MD for professional editing and proofreading of the manuscript.
The authors declare that they have no competing interests.
Availability of data and materials
The dataset supporting the conclusions of this article will be available to the Editors and Reviewers upon request.
Ethics approval and consent to participate
Investigation protocol was approved by the Jagiellonian University Bioethics Committee, Cracow, Poland (KBET/249/B/2012). Written consent was obtained from all subjects prior to enrollment in the study.
This work was supported by a postdoctoral fellowship Mobilnosc Plus (1280/MOB/IV/2015/0 to TM and 1079/MOB/2013/0 and 1079/1/MOB/13/2014/0 to AS) from the Polish Ministry of Science and ImmunoTension from the European Commission (project reference 631773).
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Schramm, A., Jasiewicz-Honkisz, B., Osmenda, G. et al. Th17 responses are not altered by natural exposure to seasonal allergens in pollen-sensitive patients. Allergy Asthma Clin Immunol 12, 55 (2016). https://doi.org/10.1186/s13223-016-0157-6
- Memory cells