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Research Article

Changes in Cytokines Status of Patients with Recurrent Pulmonary Tuberculosis Receiving Chemotherapy

Dmytro O. Butov1*, Mykhailo M. Kuzhko2, Olga S. Shevchenko1, Hanna L. Stepanenko1, Tetyana S. Butova1

1Kharkiv National Medical University, Kharkiv, Ukraine.
2National Institute on phtysiatry and pulmonology named by F.G. Yanovsky NAMS of Ukraine, Kiev, Ukraine.

*Corresponding author:  Dmytro O. Butov, Department of Phthisiology and Pulmonology, Kharkiv National Medical University, Kharkiv, Ukraine, Tel: +380977723777; E-mail: dddimad@yandex.ua

Submitted: 08-24-2015 Accepted: 10 -14-2015 Published: 10-26-2015

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Article

 

Background and objective

Select cytokines in patients with recurrent TB receiving anti-TB chemotherapy were compared to the levels in healthy individuals in order to assess the balance between inflammatory and anti-inflammatory responses.

Materials and methods

Cytokines, IL-2, IL-4, IL-8, IL-10 and IFN-γ, were examined by quantitative ELISA (pg/L) in patients with recurrent TB (1st group; N=100) and healthy individuals (2nd group; N=30). All patients received standard TB drugs: Isoniazid (0.3 g); Rifampicin (0.6 g); Pyrazinamide (2 g); Ethambutol (1.2 g) and/or Streptomycin (1 g).


Results

At baseline the 1st group had serum levels of IL-2 (39.44±0.71); IL-4 (9.55±0.24); IL-8 (21.14±0.32); IL-10 (40.04±0.74) and IFN-γ (106.20±0.67); 2nd group had IL-2 (21.60±0.80); IL-4 (29.99±1.27); IL-8 (9.96±0.62); IL-10 (50.25±1.26); IFN-γ (63.82±2.27). After 2 months, there was a significant decrease in pro-inflammatory cytokine levels in the 1st (IL-2: 29.59±0.55; IL-8: 18.22±0.22; IFN-γ: 71.14±1.21). Conversely, IL-4 increased in 1st to 16.68±0.44 and IL-10 – 48.53±0.87 (p<0.05).


Conclusion

Prior to the study initiation patients with TB had higher IL-2, IL-8, IFN-γ and lower IL-10 and IL-4 content than healthy controls. Two-month chemotherapy produced significant reduction in pro-inflammatory cytokines and increase in anti-inflammatory IL-10 and IL-4, with levels approaching those of healthy controls. Thus, TB drugs appear to have the anti-inflammatory effect in TB patients, which was predictive of positive clinical outcome.

Keywords: Recurrent Pulmonary Tuberculosis; Cytokines; Interleukin-2; Interleukin-4; Interleukin-8; Interleukin-10; Interferon-
γ

Introduction

Tuberculosis (TB) occupies one of the leading positions among the most common infectious diseases. Despite the stabilization of morbidity, there is a difficult epidemiological situation with TB due to the increasing of proportion of severe advanced forms and rate growth of relapse in the total incidence of TB [1,2]. In addition, the issue of pulmonary tuberculosis relapse has been remaining of great importance due to the consistently high incidence of tuberculosis reactivation in patients with active tuberculosis history for many years [3].

The body immune system, in which lungs perform a significant role, provides systemic and local reactions to antigenic impact of different genesis. Cell interactions in the immune response are provided by cytokines system. Cytokines — are secretion products of cells involved in immune processes to identify cellular interaction. They provide pro- and anti-inflammatory, immunostimulatory, immunosuppressive, hematopoietic effects, acting through receptors on the of target cells surface [4].

Studies on cytokines issues is becoming an obligatory part o immunological tests in clinical practice. The nature and intensity of the immune response is dependent on assessment of cytokine profiles, this allows obtaining information about various types of functional activity of immune cells, the severity of inflammation and its prognosis, the relationship between processes of activation of T-helper cells [5], the effectiveness of new immunological drugs [6] and the monitoring of therapy [7]. According to some authors, one of the key cytokines in tuberculosis inflammation is interleukin (IL) -2, IL-4, IL-8, IL-10 and interferon-γ (IFN-γ) [5,7,8]. It should be noted ambiguity of the mentioned above references as to cytokines markers [9- 15].


The major cytokine producing lymphocytes are T-helpers (Th). IL-2 is produced by activated Th1, cytokine that stimulates an immune response by activating T-cell populations, stimulates the synthesis of interferon-γ and tumor necrosis factor (TNF) [16,17], is a factor of growth and differentiation of B-lymphocytes involved in implementation immune defense and antitumor resistance [16,17]. In anti-TB protecting it participates mainly in delayed-type hypersensitivity reactions, activates cytotoxic T cells, monocytes and macrophages that induce the synthesis and secretion of TNF-α, IL-6, IL-8 [16].


Product of Th 2 cells — IL-4 — is a strong growth factor for B-lymphocytes, which contributes to their differentiation, activation and reproduction, supports cell proliferation, promotes the development of allergic reactions has antitumor activity [16-18].At the same time IL-4 induces cytotoxic activity of macrophages, stimulating their migration the inflammation site, increases toxicity of TNFα resulting in pulmonary fibrosis development [17,19].


IL-8 — low molecular-weight inflammatory cytokine is produced under the influence of bacterial endotoxins and cytokines, mainly TNF and IL-1, contributes to monocytes and neutrophils activation, and induces their chemotaxis to the inflammation site [20,21].


IL-10 is produced by Th2 lymphocytes type, as well as by monocytes, macrophages, is the most important regulator of immune response that suppresses the activity of macrophages and Th1 cells and ensures the implementation of some biological effects of Th2. IL-10 takes part in anti-inflammatory response realization by autotolerance inhibiting [22].IL-10 promotes the development of humoral component of the immune response providing anti-parasitic protection and allergic reactivity [22].


IFNγ is formed by stimulating T-lymphocytes with various antigens [23], it is a key cytokine for cellular immune response  and humoral immune response inhibitor [24].


Monitoring the diversity of subpopulations of lymphocytes provides a variety of cytokine production and determines the preference of Th1 or Th2 depending on the type of cellular response to Mycobacterium tuberculosis [5,25]. T-helper cells are the first which identify antigenic peptide, after receiving activating signal they differentiate into Th1 and Th2 types [26,27]. Th1 activation leads to the formation of cellular immunity, and activation of Th2 mediates humoral immunity [28]. Th1 mainly produces IL-2 and IFNγ, and Th2 produces IL-4 and IL-10 [29,30,31,32]. Many of antibacterial agents, including anti-TB drugs, have certain immunosuppressive effects that limit the potential of the body to resist infections [33].

Thus, the aim of our study was to establish the characteristics of immunological activity of serum cytokines in patients with relapsed pulmonary tuberculosis (RPTB) before and during antimycobacterial chemotherapy.

Materials and Methods

There were 130 persons under our observation, of them 100 patients with RPTB (1st group) and 30 relatively healthy donors (2nd group). The first group was divided into two subgroups: 1A RPTB patients without a destructive process in the lung (29 patients), 1B — with the presence of destructive process (71 patients) (Figure 1).

physiology fig 5.1

Figure 1. Composition of study population according to underlying diagnosis.

Patients were selected for this study when staying in the Regional TB Hospital № 1 and in the Regional Anti-TB Dispensary № 1 both located in Kharkiv; in the Regional Anti-TB Dispensary № 3 in Zmiyiv and in the Regional Anti-TB Dispensary № 4 in Izyum, both located in Kharkiv region. The healthy donors (2nd group) with comparable age characteristics, with no lung disease in anamnesis, no pathological changes in the X-ray lung examination of the chest, with no chronic infectious disease, without acute allergic reactions and respiratory diseases along 3 preceding the study months. The first-line drugs were used as a basic anti-TB chemotherapy: isoniazid (0.3 g), rifampicin (0.6 g), pyrazinamide (2 g), ethambutol (1.2 g) and/or streptomycin (1 g) with further decreasing of the dose regime.


Cytokines Measurement

The levels of cytokines (IL-2, IL-4, IL-10 and IFNγ) in serum were evaluated by using standard ELISA kits (Company «VECTOR-
BEST», Novosibirsk, Russian Federation). Serum samples for testing were taken during first days on admission and after 2 months of in-patient treatment.


Statistical Evaluation
 
The obtained data were statistically analyzed by standard Student t-test [34]. The difference was considered to be significant
at p<0.05.

Ethics

The project was approved by the Ethics Committee of the Kharkiv National Medical University, Ukraine. It was conducted according to the Declaration of Helsinki standards. All of the patients provided written informed consent and explicitly provided permission for blood analyses, as well as for the collection of relevant clinical data.

Results

Prior to treatment in patients with RPTB, there was estimated a significant increase of IL-2, IL-8 and IFN-γ levels when compared to healthy donors (Table 1). This can be due to the universal reaction of the immune response to the Mycobacterium tuberculosis (MBT) agents destruction. It is well-known that the role of IL-2 and IFN-γ in antituberculous protection is provided by its effect on the macrophages activation, direct cytotoxicity of T-cells [16]. On the other hand, it supports pro-activation of phagocytic destruction MBT [23].


During the study of anti-inflammatory cytokines such as IL-4 and IL-10, we observed their significantly lower levels in blood serum comparing to the 2nd group at the beginning of the treatment (p<0.05). Thus, activity status and there are only a tendency for the profile of Th2- lymphocytes were reduced before treatment. This can be due to higher activation and the number Th1-lymphocytes, confirmed by increased antituberculous immunity in patients with pulmonary TB in the beginning of chemotherapy.


IL-2, IL-8 and IFN-γ blood concentrations significantly decreased in patients with pulmonary TB after the two-month standard therapy when compared to basic levels. IL-2, IL-8 and IFN-γ levels were still significantly higher in patients with pulmonary TB after two months of treatment when compared to the 2nd group. Judging by this reaction, we can conclude of activity and quantitative Th1-lymphocyte population decrease in this cohort of patients. In its turn, this may indicate the relative process stabilization in patients with pulmonary TB due to significantly higher levels of IL-2 and IFN-γ comparing to healthy donors.


While we observed IL-2, IL-8 and IFN-γ concentrations decrease during the conducted two-month therapy in patients with pulmonary TB, L-4 and IL-10 levels, by contrast, were significantly increased in patients with TB when compared to the baseline parameters before chemotherapy. Thus, we could observe activation and are only a tendency for the profile increasing the Th2-lymphocytes amount and as a result — relative Th1-lymphocytes stabilization development. Comparing the described parameters to those of healthy donors after twomonth anti-TB treatment, IL-4 levels were significantly lower than in the 2nd group, indicating relative insufficiency of this parameter restoration at the 2nd month of treatment (p<0.05). As for IL-10 concentration, there were observed non-significant values in patients with RPTB, indicating relative cytokine restoration at the 2nd months of the therapy (p>0.05) (Table 1).


When comparing parameters in subgroups of the RPTB patients, we observed insignificancy of mentioned above results at the beginning and after two months of antimycobacterial chemotherapy that may indicate independent immune response, both in the presence or absence of the destructive process.

Thus, in patients with RPTB we observed a significant increase of IL-2, IL-8, IFN-γ concentrations and decrease of IL-4, IL-10 levels when compared to healthy donors. When using standard antimycobacterial therapy we observed significant decreased IL-2, IL-8, IFN-γ levels, and, on the contrary, under the influence of anti-tuberculosis therapy IL-4, IL-10 levels significantly increased. No significant difference in cytokine levels was revealed between the presence and absence of cavities, both before or after two months of the treatment.

Table 1. Cytokines in patients with pulmonary tuberculosis prior to and after 2-month anti-TB chemotherapy as compared
with healthy controls (Mean ± SD), pg/L.

 physiology table 5.1

® – discrepancy is not significant (р>0.05) when compared with Group 2;
*– discrepancy is significant (р<0.05) when compared with Group 2;
∙– discrepancy is significant (р<0.001) when compared before treatment and after two months levels among Group and Subgroups;
#– discrepancy is not significant (р>0.05) between Subgroups 1A and 1B.

Conclusions

1. Patients with pulmonary TB display signs of inflammation characterized by decrease of IL-4 and IL-10 and increase of IL-2, IL-8 and IFN-γ as compared to healthy donors.

2. Standard 2-month TB therapy results in reversal of inflammation characterized by decrease in IL-2 and IFN-γ and increase of IL-10 to the levels comparable to healthy donors.

3. IL-2, IL-4, IL-8, IL-10, and IFN-γ are immune correlates of treatment outcome and can help to identify better strategy for TB management.

4. TB chemotherapy may have immunomodulatory effect of anti-inflammatory nature.

5. No significant difference in cytokine (IL-2, IL-4, IL-8, IL-10, and IFN-γ) levels was revealed between the presence and absence of cavities, both before or after two months of the treatment.

References

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Cite this article:  Butov. Changes in Cytokines Status of Patients with Recurrent Pulmonary Tuberculosis Receiving Chemotherapy. J J Physiology. 2015, 1(1): 005.

 

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