Angiogenic activity of sera from interstitial lung disease patients in relation to pulmonary function
European Journal of Medical Research volume 15, Article number: 229 (2010)
Chronic inflammation and fibrosis are characteristic of interstitial lung diseases (ILD) and are accompanied by neovascularisation. The aim of this study was to examine the relationship between the angiogenic activity of sera from ILD patients and pulmonary function tests.
Material and methods
Serum samples were obtained from 225 ILD patients: 83 with sarcoidosis, 31 with idiopathic pulmonary fibrosis, 29 with extrinsic allergic alveolitis, 16 with collagen vascular diseases, 13 with scleroderma with pulmonary manifestations (SCL), 14 with Wegener's granulomatosis (WG), 12 with silicosis, 12 with pulmonary Langerhans cells histiocytosis, 10 with drug-induced pulmonary fibrosis, 5 with cryptogenic organizing pneumonia, and 36 healthy volunteers. An animal model of leukocyte induced angiogenesis assay was used as an angiogenic test. In all patients spirometry, whole body plethysmography, static lung compliance, and single breath diffusing capacity of the lungs for carbon monoxide (DLCO) were performed.
The angiogenic properties of sera from ILD differed, depending on the disease. In the examined ILD, the most important functional disturbances were decreases in static compliance and DLco. The correlation between DLCO and angiogenic activity of sera was observed (P < 0.05).
The data show that sera from ILD patients constitute a source of mediators modulating angiogenesis. Angiogenic activity of sera of ILD patients is related to DLCO.
Interstitial lung diseases (ILD) constitute a large group of disorders characterized by various etiology and pathogenesis . Inflammation and fibrosis are the most important processes in the course of ILD-provoked disturbances in gas exchange and hypoxia . Chronic inflammation and hypoxia are strong stimuli for neovascularisation . Angiogenesis participates in the pathogenesis of idiopathic pulmonary fibrosis (IPF) [4, 5] and probably also in other ILD [6, 7]. However, the role of angiogenesis in the pathogenesis of ILD is unclear. Aberrant angiogenesis and defective epithelial repair are key features of IPF . Ebina et al  have demonstrated an increase in the density of capillaries and a decrease in lung vascularisation in IPF. Data concerning the role of neoangiogenesis in the pathogenesis of ILD have created a target for new drugs. Thalidomide, a strong antiangiogenic drug has been used successfully in some cases of ILD . Previously, we described a modulation of angiogenesis by sera from patients with ILD and its relation to clinical symptoms and radiological changes . Little is known about the extent of neovascularisation in ILD in relation to pulmonary function. The aim of this study was to evaluate the angiogenic activity of sera from ILD patients in relation to lung function.
Material and Methods
The protocol of this study was approved by the local Ethics Committees for both human and animal research. The study population consisted of 225 ILD patients (Table 1): 122 men and 103 women (mean age 47 ± 15). The majority of them (159) had never smoked tobacco. Blood samples were taken from patients before treatment with steroids or immunosuppressants. The diagnosis of ILD was based on clinical, radiological, functional, serological, BAL, and pathological findings according to the previously described criteria . The group of collagen or vascular diseases with pulmonary manifestations, confirmed by high resolution computed tomography, consisted of 14 patients with WG, 13 with SCL, 7 with rheumatoid arthritis, 4 with systemic lupus erythematosus, 2 with dermatomyositis, 2 with a mixed connective tissue disease, and 1 patient with psoriatic arthritis. For the control purpose, we used sera from 36 healthy volunteers recruited from our medical staff previously characterized .
Lung Function Tests
In all patients, spirometry, whole body plethysmography, static lung compliance, and single-breath diffusing capacity of the lung for carbon monoxide were performed according to the ERS standards , using MasterLab Jaeger equipment (Hochberg, Germany). A restrictive ventilatory defect was defined as TLC lower than 80% of predicted and an obstructive one as FEV1/FVC < 0.7 . A decrease in PEF < 80% and MEF50 < 60% and an increase in RV > 120% or Raw > 130% were considered abnormal.
Angiogenesis was evaluated by a leukocyte-induced angiogenesis assay in an animal model described by Sidky and Auerbach , with some modification . The Balb/c mice served as recipients of mononuclear cells (MNC) preincubated in PBS supplemented with 25% of serum from ILD patients or from healthy volunteers for one hour at 37°C. As a control, MNC were pre-incubated only in PBS. Samples of 0.05 ml volume containing 5 × 105 MNC in the Parker medium were injected intradermally into mice narcotized with 3.6% chloral hydrate, using a ratio of three mice for every patient and six injections for every mouse. Three days later, angiogenic reaction was estimated by microscope (Nikon, Japan) at 6× magnification on the inner surface of the skin of each mouse. The result was evaluated blindly based on the previously described criteria .
The results were expressed as an angiogenesis index (AI) representing the average of the mean numbers of new blood vessels after the injection of MNC pre-incubated in PBS with sera from the examined patients divided by the mean number of new blood vessels after the injection of MNC pre-incubated only in PBS. The data were presented as means ± SD and P < 0.05 was regarded as statistically significant. Statistical evaluation was performed using a t-test and Pearson's correlation (Statistica 6 for Windows).
The number of newly-created vessels was highest for extrinsic allergic alveolitis (EAA) (Table 2). The mean number of new vessels formed after the injection of MNC pre-incubated with sera from collagen vascular diseases (CVD), WG, IPF, sarcoidosis, silicosis and cryptogenic organizing pneumonia (COP) patients was significantly higher than that in healthy volunteers. Sera from the patients with pulmonary Langerhans cells histiocytosis (PLH) and SCL presented antiangiogenic properties comparable with those in healthy donors and control samples with PBS.
The highest angiogenesis index was observed after incubation of MNC pre-incubated with sera from EAA (Figure 1) and lower indices were after pre-incubation of MNC with sera from the sarcoidosis, WG, CVD, and IPF patients. The angiogenesis index of silicosis patients was higher than that of healthy donors or drug-induced pulmonary fibrosis (DIPF) patients. Sera from COP patients significantly stimulated angiogenesis compared with the sera from the PHL and SCL patients. Sera from the PLH and SCL patients strongly decreased the angiogenic capability of MNC compared with the healthy control group.
Angiogenic Activity of Sera in Relation to Lung Function Tests
In the examined ILD, the most important functional disturbances were decreases in static compliance and pulmonary oxygen diffusion measured by DLCO (Table 3). Cst below 80% of predictive value was observed in all groups, except the sarcoidosis and PLH patients. The obstructive ventilatory syndrome was not observed in the examined groups.
DLco significantly correlated with the angiogenesis index in the ILD patients (Figure 2). The number of new vessels in the group of 122 patients with DLCO > 80% (16.1 ± 2.0) was significantly higher than that in the group of 94 patients with DLCO < 80% (15.0 ± 2.8). Also, the mean angiogenesis index was significantly higher in the group with DLCO > 80% compared with the patients having DLCO < 80% (Figure 3).
Although the evidence of angiogenesis in the pathogenesis of ILD accumulates, the role of the process during the disease course is unclear. It remains to be explained whether the process intensifies with the increase in fibrosis and whether it can be observed in the early stages of disease. It is also difficult to formulate an unequivocal answer to the question of whether angiogenesis is a component of lung fibrosis development or an element of the lung's defence against the destructive impact of fibrosis. Keane et al [13, 14] have demonstrated increased angiogenic activity in lung tissue of IPF patients and experimental drug-induced pulmonary fibrosis. Sekiya et al  have demonstrated that serum VEGF values in patients with sarcoidosis constitute a predictive factor in determining extra-thoracic organ involvements. Navarro et al  have observed an increase in the VEGF serum level in EAA patients and a significant decrease in BALF, compared with healthy controls. Tachihara et al  have demonstrated in NSIP and IPF patients a decrease in the expression of VEGF mRNA in the alveolar septa associated, with a reduction in the number of capillary tubes via endothelial cell apoptosis that possibly results in alveolar remodelling. However, tests using the in situ hybridization method and immunohistochemical tests of lung cross-sections for sarcoidosis patients provided evidence of the increased expression of mRNA for VEGF in lung macrophages, epithelial and giant cells as well as the increased production of VEGF by these cells . The above described indicates the complexity and heterogeneity of the ILD group.
The highest proangiogenic activity of sera was observed in granulomatous diseases such as sarcoidosis, allergic alveolitis, and collagen diseases, and also in vasculitis. The sera of patients with diseases linked mainly to pulmonary fibrosis show increased proangiogenic activity, but less intense than in granulomatous diseases and vasculitis. In all our cases, after diagnosis of DIPF, the harmful treatment was stopped and patients were examined in an inactive phase of the disease. It explains why the serum angiogenic activity in patients with DIPF was similar to the activity of sera from healthy controls. This indicates how important the stage and severity of illness are at the moment of the evaluation of angiogenic activity. In earlier research we demonstrated that angiogenic activity in sarcoidosis patients is significantly higher in phase II than in phases I and III . Sera from sarcoidosis patients with extra-pulmonary changes exert a stronger effect on angiogenesis than sera from patients with thoracic changes only . Antoniou et al  have demonstrated different angiogenic activity in pulmonary sarcoidosis and IPF.
In contrast to many ILD, sera from scleroderma and PLH patients exert an inhibitory effect on angiogenesis compared with the PBS and healthy controls. Late stages of scleroderma are characterized by the loss of dermal papillae, subepidermal fibrosis, and hypovascularity subunit expression . Our results suggest an increase in angiostatic factors in serum from scleroderma patients. Endostatin has been characterized as a potent inhibitor of VEGF-induced angiogenesis . Mulligan-Kehoe et al  have suggested that the angiogenesis seems impaired in scleroderma and this could result from excessive angiostatic factors or disrupted VEGF signaling. Data on neovascularisation in PLH are scarce. Senechal et al  have demonstrated that Langerhans cell histiocytosis lesions constituted a site of active inflammation and neoangiogenesis. In contrast, we observed that the sera from pulmonary form of the diseases inhibited angiogenesis. Perhaps angiogenesis only takes part in multifocal Langerhans cell histiocytosis, characterized by a clonal proliferation of cells.
We know little about the relationship between angiogenesis and pulmonary function disturbances in ILD. Simler et al  have reported that the serum VEGF level of patients with IPF negatively relates to the change in FVC after 6 months. Recently, a negative correlation between endostatin, forced vital capacity and gas transfer in IPF has been described . A correlation between DLCO and serum angiogenic activity is extremely interesting because the diffusing capacity of the lungs depends not only on ventilation and the thickness of the alveolar-vascular barrier, but also on the vascularity of the alveoli. Perhaps, in the early inflammatory phases of ILD stimulation occurs as confirmed by increased angiogenic activity in the serum of patients. Neovascularisation in a lung leads to an increase in diffusion gases and an improvement of the lung function. Perhaps, this process plays a pivotal role in controlling the migration of T-cells to the sites of ongoing inflammation, thereby facilitating structural regeneration. During this period, angiogenesis may perform a protective role in the pathogenesis of disease. Newly developed vessels may also easily facilitate the migration of circulating fibrocytes through chemotactic agents and, therefore, may lead to fibrogenesis per se. Renzoni et al  have suggested that angiogenesis may occur in the earlier stages of the development of pulmonary fibrosis because of a reduction in the total vascular area and vascular density in IPF patients. Burdick et al  have demonstrated that angiogenic activity in the lungs of patients with IPF is significantly decreased.
The fundamental question remains of whether there are too many or too few new vessels in pulmonary fibrosis. We still do not know whether angiogenesis helps or destroys. Perhaps it does both. In certain ILD, there is a process leading to an excessive creation of vessels and in others to insufficient numbers of vessels, thereby leading towards respiratory insufficiency. This hampers an unequivocal definition of whether the objective of ILD treatment should be stimulation or inhibition of neovascularisation. Thalidomide has some clinical effect in sarcoid cases resistant to corticosteroid treatment . Recently, Tabata et al  have demonstrated that thalidomide prevents bleomycin-induced pulmonary fibrosis in mice. Recent findings support the notion that therapy directed at either inhibition of angiogenesis or augmentation of angiostatic CXC chemokines may be a novel approach in the treatment of IPF . Angiogenesis that leads to aberrant vascular remodelling is regulated by an opposing balance of angiogenic and angiostatic factors. Continuous work is needed to explain the role of neovascularisation in the pathogenesis of ILD; increasing evidence points to the impact of angiogenesis on the development of the disease.
Sera from ILD patients constitute a source of mediators modulating angiogenesis. In the examined ILD in the present study, the most important functional disturbances were decreases in DLCO and static compliance. DLCO was related to the angiogenic activity of sera from ILD patients.
Conflicts of interest
The authors declare that they have no competing interests.
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This work was supported by an internal grant from the Institute of Tuberculosis and Lung Diseases in Warsaw.
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Zielonka, T.M., Demkow, U., Radzikowska, E. et al. Angiogenic activity of sera from interstitial lung disease patients in relation to pulmonary function. Eur J Med Res 15 (Suppl 2), 229 (2010). https://doi.org/10.1186/2047-783X-15-S2-229
- interstitial lung diseases
- lung function tests
- diffusing capacity