Modulation of TDM-induced granuloma pathology by human lactoferrin: a persistent effect in mice.

Lactoferrin (LTF), an iron binding protein, is known to exhibit immune modulatory effects on pulmonary pathology during insult-induced models of primary Mycobacterium tuberculosis (Mtb) infection. The effects of LTF correlate with modulation of the immune related development of the pathology, and altering of the histological nature of the physically compact and dense lung granuloma in mice. Specifically, a recombinant human version of LTF limits immediate progression of granulomatous severity following administration of the Mtb cell wall mycolic acid, trehalose 6,6'-dimycolate (TDM), in part through reduced pro-inflammatory responses known to control these events. This current study investigates a limited course of LTF to modulate not only initiation, but also maintenance and resolution of pathology post development of the granulomatous response in mice. Comparison is made to a fusion of LTF with the Fc domain of IgG2 (FcLTF), which is known to extend LTF half-life in circulation. TDM induced granulomas were examined at extended times post insult (day 7 and 14). Both LTF and the novel FcLTF exerted sustained effects on lung granuloma pathology. Reduction of pulmonary pro-inflammatory cytokines TNF-α and IL-1ß occurred, correlating with reduced pathology. Increase in IL-6, known to regulate granuloma maintenance, was also seen with the LTFs. The FcLTF demonstrated greater impact than the recombinant LTF, and was superior in limiting damage to pulmonary tissues while limiting residual inflammatory cytokine production.

Managing Granulomatous-Lymphocytic Interstitial Lung Disease in Common Variable Immunodeficiency Disorders: e-GLILDnet International Clinicians Survey.

Background: Granulomatous-lymphocytic interstitial lung disease (GLILD) is a rare, potentially severe pulmonary complication of common variable immunodeficiency disorders (CVID). Informative clinical trials and consensus on management are lacking. Aims: The European GLILD network (e-GLILDnet) aims to describe how GLILD is currently managed in clinical practice and to determine the main uncertainties and unmet needs regarding diagnosis, treatment and follow-up. Methods: The e-GLILDnet collaborators developed and conducted an online survey facilitated by the European Society for Immunodeficiencies (ESID) and the European Respiratory Society (ERS) between February-April 2020. Results were analyzed using SPSS. Results: One hundred and sixty-one responses from adult and pediatric pulmonologists and immunologists from 47 countries were analyzed. Respondents treated a median of 27 (interquartile range, IQR 82-maximum 500) CVID patients, of which a median of 5 (IQR 8-max 200) had GLILD. Most respondents experienced difficulties in establishing the diagnosis of GLILD and only 31 (19%) had access to a standardized protocol. There was little uniformity in diagnostic or therapeutic interventions. Fewer than 40% of respondents saw a definite need for biopsy in all cases or performed bronchoalveolar lavage for diagnostics. Sixty-six percent used glucocorticosteroids for remission-induction and 47% for maintenance therapy; azathioprine, rituximab and mycophenolate mofetil were the most frequently prescribed steroid-sparing agents. Pulmonary function tests were the preferred modality for monitoring patients during follow-up. Conclusions: These data demonstrate an urgent need for clinical studies to provide more evidence for an international consensus regarding management of GLILD. These studies will need to address optimal procedures for definite diagnosis and a better understanding of the pathogenesis of GLILD in order to provide individualized treatment options. Non-availability of well-established standardized protocols risks endangering patients.

Desquamative interstitial pneumonia induced by metal exposure. A case report and literature review.

BACKGROUND: Forms of interstitial pneumonia secondary to exposure to an air-contaminant are varied and so far, insufficiently described. OBJECTIVES/METHODS: We report here a case of a 57-year-old patient managed in our department for the exploration of MRC grade 2 dyspnoea and interstitial pneumonia. He mentioned multiple occupational and domestic exposures such as hens' excrements, asbestos and metal particles; he also had a previous history of smoking. RESULTS: High-resolution computed tomography showed ground glass opacities predominating in posterior territories and surrounding cystic lesions or emphysematous destruction. The entire etiological assessment revealed only macrophagic alveolitis with giant multinucleated cells on the bronchoalveolar lavage. A surgical lung biopsy allowed us to refine the diagnosis with evidence of desquamative interstitial pneumonia and pulmonary granulomatosis. Finally, the analysis of the mineral particles in the biopsy revealed abnormally high rates of Zirconium and Aluminium. We were therefore able to conclude to a desquamative interstitial pneumonia associated with pulmonary granulomatosis linked to metal exposure (Aluminium and Zirconium). The clinical, functional and radiological evolution was favorable after a systemic corticosteroid treatment with progressive decay over one year. CONCLUSION: This presentation reports the first case to our knowledge of desquamative interstitial pneumonitis related to exposure to Zirconium and the third one in the context of Aluminium exposure. The detailed analysis of the mineral particles present on the surgical lung biopsy allows for the identification of the relevant particle to refine the etiological diagnosis, to guide the therapeutic management and to give access to recognition as an occupational disease. (Sarcoidosis Vasc Diffuse Lung Dis 2020; 37 (1): 79-84).

Granulomatosis broncocéntrica como expresión de toxicidad pulmonar por lamotrigina / Bronchocentric granulomatosis as expression of pulmonary toxicity by lamotrigine

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Antifibrotics Effect of Liposome-Encapsulated Composition of Oxidized Dextran and Isonicotinic Acid Hydrazide in Mice with BCG-Induced Granulomatosis Depends on Administration Route.

We studied the response of the extracellular matrix of the lungs and liver in mice with BCGinduced granulomatosis (3 months) after inhalation and intraperitoneal administration of liposome-encapsulated dextrazide (LEDZ): a conjugate of oxidized dextran (40 kDa) and isonicotinic acid hydrazide (INH). LEDZ inhalation proved to be more effective in reducing fibrosis severity, both in the lungs and liver. However, the mechanisms of the antifibrotic effect were different: increased degradation and reduced collagen synthesis in the lungs and reduced collagen synthesis and collagen degradation in the liver. This suggest that drug administration routes and delivery to the target organs are crucially important in the therapy of tuberculosis. The antifibrotic effect depended on LEDZ administration route and was more potent after LEDZ inhalation.

Location of Pulmonary Mycobacteria Tuberculosis and Effectiveness of Various Dextrazide Compositions in Treatment of Mice with BCG-Induced Granulomatosis.

The study examined effectiveness of liposomal form of dextrazide (inhaled or intraperitoneal), free dextrazide (intraperitoneal), and isoniazid (intraperitoneal) in the treatment of BALB/c mice with BCG-induced granulomatosis. The mice were infected with mycobacteria tuberculosis 3 months prior to onset of treatment. The preparations under examinations were administered twice a week over 2 months. The decrease of the number and size of macrophagal granulomas in mice BCG-induced granulomatosis during treatment was determined by the number of living mycobacteria tuberculosis in these granulomas. The most effective treatment was achieved with liposomal form of dextrazide (a conjugate of oxidized dextran with isonicotinic acid hydrazide). Macrophages with captured mycobacteria tuberculosis, dextrazide, and dextrazide-loaded liposomes can be incorporated into granulomas. The antimycobacterial effect of dextrazide is an important factor preventing the destructive processes in granulomas and organs via a decrease in the prodestructive potential of lysosomes in macrophages realized after their migration from granulomas.

Effect of Liposomal Delivery of Oxidized Dextran with Isonicotinic Acid Hydrazide on Component Profile of Pulmonary Extracellular Matrix in Mice with BCG-Induced Granulomatosis.

Intraperitoneal injections of isonicotinic acid hydrazide (INH), dextrazide (oxidized dextran+INH), or liposomes loaded with dextrazide (INH dose of 14 mg/kg) over 2 months to mice with BCG-induced granulomatosis started from postinfection day 90 induced qualitative and quantitative changes in composition of pulmonary extracellular matrix. Both dextrazide and its liposomal form decreased the levels of sulfated glycosaminoglycans and uronic acids. In contrast to INH, both preparations did not decrease the levels of total glycosaminoglycans, proteins, and galactose. This difference is explained by the fact both free and liposomal dextrazide activated MMP, but did not increase the content of TIMP-1 and TIMP-2, whereas injection of INH was followed by an increase in TIMP-2 content and a decrease in the level of free hydroxyproline, which attested to down-regulation of collagen degradation and maintenance of the conditions for pulmonary fibrosis in mice of this group.

The Synergistic Effects of the Glutathione Precursor, NAC and First-Line Antibiotics in the Granulomatous Response Against Mycobacterium tuberculosis.

Mycobacterium tuberculosis (M. tb), the causative bacterial agent responsible for tuberculosis (TB) continues to afflict millions of people worldwide. Although the human immune system plays a critical role in containing M. tb infection, elimination proves immensely more challenging. Consequently, there has been a worldwide effort to eradicate, and limit the spread of M. tb through the conventional use of first-line antibiotics. Unfortunately, with the emergence of drug resistant and multi-drug resistant strains of M. tb the archetypical antibiotics no longer provide the same ascendancy as they once did. Furthermore, when administered, these first-line antibiotics commonly present severe complications and side effects. The biological antioxidant glutathione (GSH) however, has been demonstrated to have a profound mycobactericidal effect with no reported adverse consequences. Therefore, we examined if N-Acetyl Cysteine (NAC), the molecular precursor to GSH, when supplemented in combination with suboptimal levels of standalone first-line antibiotics would be sufficient to completely clear M. tb infection within in vitro derived granulomas from healthy subjects and individuals with type 2 diabetes (T2DM). Our results revealed that by virtue of immune modulation, the addition of NAC to subprime levels of isoniazid (INH) and rifampicin (RIF) was indeed capable of inducing complete clearance of M. tb among healthy individuals.

Efficacy of pyrazinoic acid dry powder aerosols in resolving necrotic and non-necrotic granulomas in a guinea pig model of tuberculosis.

New therapeutic strategies are needed to treat drug resistant tuberculosis (TB) and to improve treatment for drug sensitive TB. Pyrazinamide (PZA) is a critical component of current first-line TB therapy. However, the rise in PZA-resistant TB cases jeopardizes the future utility of PZA. To address this problem, we used the guinea pig model of TB and tested the efficacy of an inhaled dry powder combination, referred to as Pyrazinoic acid/ester Dry Powder (PDP), which is comprised of pyrazinoic acid (POA), the active moiety of PZA, and pyrazinoic acid ester (PAE), which is a PZA analog. Both POA and PAE have the advantage of being able to act on PZA-resistant Mycobacterium tuberculosis. When used in combination with oral rifampicin (R), inhaled PDP had striking effects on tissue pathology. Effects were observed in lungs, the site of delivery, but also in the spleen and liver indicating both local and systemic effects of inhaled PDP. Tissue granulomas that harbor M. tuberculosis in a persistent state are a hallmark of TB and they pose a challenge for therapy. Compared to other treatments, which preferentially cleared non-necrotic granulomas, R+PDP reduced necrotic granulomas more effectively. The increased ability of R+PDP to act on more recalcitrant necrotic granulomas suggests a novel mechanism of action. The results presented in this report reveal the potential for developing therapies involving POA that are optimized to target necrotic as well as non-necrotic granulomas as a means of achieving more complete sterilization of M. tuberculosis bacilli and preventing disease relapse when therapy ends.

Matrix metalloproteinase inhibitors enhance the efficacy of frontline drugs against Mycobacterium tuberculosis.

Mycobacterium tuberculosis (Mtb) remains a grave threat to world health with emerging drug resistant strains. One prominent feature of Mtb infection is the extensive reprogramming of host tissue at the site of infection. Here we report that inhibition of matrix metalloproteinase (MMP) activity by a panel of small molecule inhibitors enhances the in vivo potency of the frontline TB drugs isoniazid (INH) and rifampicin (RIF). Inhibition of MMP activity leads to an increase in pericyte-covered blood vessel numbers and appears to stabilize the integrity of the infected lung tissue. In treated mice, we observe an increased delivery and/or retention of frontline TB drugs in the infected lungs, resulting in enhanced drug efficacy. These findings indicate that targeting Mtb-induced host tissue remodeling can increase therapeutic efficacy and could enhance the effectiveness of current drug regimens.

Granulomatous-Lymphocytic Interstitial Lung Disease in a Patient With Common Variable Immunodeficiency.

Common variable immunodeficiency is the most common primary immunodeficiency and consists of impaired immunoglobulin production causing recurrent sinopulmonary infections. The most common cause of mortality for this disorder, however, is from the development of malignancy and autoimmune disorders. One common entity that develops is a systemic granulomatous and lymphoproliferative disorder that can cause an interstitial lung disease more formally referred to as granulomatous-lymphocytic interstitial lung disease (GL-ILD). We discuss a case of a 25-year-old woman with common variable immunodeficiency and GL-ILD and review the literature to summarize the most common radiological findings to raise the suspicion for GL-ILD on high-resolution computed tomography and delineate this from infection and other mimickers. We will also review key histopathological characteristics for diagnosis and the clinical approach and treatment options for this rare disease.

FDG PET-CT imaging of therapeutic response in granulomatous lymphocytic interstitial lung disease (GLILD) in common variable immunodeficiency (CVID).

Common variable immunodeficiency (CVID) is the most common severe adult primary immunodeficiency and is characterized by a failure to produce antibodies leading to recurrent predominantly sinopulmonary infections. Improvements in the prevention and treatment of infection with immunoglobulin replacement and antibiotics have resulted in malignancy, autoimmune, inflammatory and lymphoproliferative disorders emerging as major clinical challenges in the management of patients who have CVID. In a proportion of CVID patients, inflammation manifests as granulomas that frequently involve the lungs, lymph nodes, spleen and liver and may affect almost any organ. Granulomatous lymphocytic interstitial lung disease (GLILD) is associated with a worse outcome. Its underlying pathogenic mechanisms are poorly understood and there is limited evidence to inform how best to monitor, treat or select patients to treat. We describe the use of combined 2-[(18)F]-fluoro-2-deoxy-d-glucose positron emission tomography and computed tomography (FDG PET-CT) scanning for the assessment and monitoring of response to treatment in a patient with GLILD. This enabled a synergistic combination of functional and anatomical imaging in GLILD and demonstrated a widespread and high level of metabolic activity in the lungs and lymph nodes. Following treatment with rituximab and mycophenolate there was almost complete resolution of the previously identified high metabolic activity alongside significant normalization in lymph node size and lung architecture. The results support the view that GLILD represents one facet of a multi-systemic metabolically highly active lymphoproliferative disorder and suggests potential utility of this imaging modality in this subset of patients with CVID.

Anti-vascular endothelial growth factor treatment normalizes tuberculosis granuloma vasculature and improves small molecule delivery.

Tuberculosis (TB) causes almost 2 million deaths annually, and an increasing number of patients are resistant to existing therapies. Patients who have TB require lengthy chemotherapy, possibly because of poor penetration of antibiotics into granulomas where the bacilli reside. Granulomas are morphologically similar to solid cancerous tumors in that they contain hypoxic microenvironments and can be highly fibrotic. Here, we show that TB-infected rabbits have impaired small molecule distribution into these disease sites due to a functionally abnormal vasculature, with a low-molecular-weight tracer accumulating only in peripheral regions of granulomatous lesions. Granuloma-associated vessels are morphologically and spatially heterogeneous, with poor vessel pericyte coverage in both human and experimental rabbit TB granulomas. Moreover, we found enhanced VEGF expression in both species. In tumors, antiangiogenic, specifically anti-VEGF, treatments can "normalize" their vasculature, reducing hypoxia and creating a window of opportunity for concurrent chemotherapy; thus, we investigated vessel normalization in rabbit TB granulomas. Treatment of TB-infected rabbits with the anti-VEGF antibody bevacizumab significantly decreased the total number of vessels while normalizing those vessels that remained. As a result, hypoxic fractions of these granulomas were reduced and small molecule tracer delivery was increased. These findings demonstrate that bevacizumab treatment promotes vascular normalization, improves small molecule delivery, and decreases hypoxia in TB granulomas, thereby providing a potential avenue to improve delivery and efficacy of current treatment regimens.

Granulomatous lung disease in a patient with a family history of hematological disorders.

BACKGROUND: A 29-year old patient presented with granulomatous lung disease and a family history of myelodysplastic syndrome/acute myeloid leukemia. She appeared to be a carrier of a mutation in the transcription factor GATA2. The case adds to the recent described heterogeneous clinical manifestations and syndromes in which, against a background of hematologic disorders, GATA2 mutations have been demonstrated, such as the Monomac and Emberger syndromes. In patients with a granulomatous disease and a history of (familial) hematologic disorders, the occurence of GATA2 mutations should be considered, as to gain further insight in the occurrence of granulomatous disease in a possible distinct phenotype among GATA2 mutation carriers.

Common variable immunodeficiency-associated granulomatous and interstitial lung disease.

PURPOSE OF REVIEW: Common variable immunodeficiency (CVID) is the most common primary immunodeficiency characterized by a deficiency of immunoglobulins. Approximately 30% of the patients develop autoimmune and granulomatous disease. Similar to sarcoidosis, granulomatous disease in CVID can potentially affect all organs, but the lung is the most common. Interstitial lung disease (ILD) manifests in 5-15% of CVID patients, and is present already at the initial diagnosis in the majority of patients. The number of published studies addressing ILD in CVID is limited. However, recently, several studies added substantial knowledge to the field and are discussed within this review in the context of the literature. RECENT FINDINGS: Histologically, ILD in CVID presents within the known patterns of sarcoid-like granuloma, organizing pneumonia, lymphocytic interstitial pneumonitis and nonspecific interstitial pneumonia. Often, these patterns are concomitantly found in the same patients. Three new articles were published which analyzed high-resolution computed tomography findings and response to treatment. SUMMARY: In a considerable number of patients, ILD is stable over years and patients may not need any immunosuppressive treatment. Prednisone treatment is often used as the first-line treatment and studies suggest response to treatment in 50-66% of cases. In progressive disease with lung function impairment, combined immunosuppressive treatment is recommended.

Trehalose 6,6'-dimycolate--a coat to regulate tuberculosis immunopathogenesis.

Tuberculosis (TB) remains a significant public health burden worldwide. Treatment of this disease requires a minimum of six months and there is no vaccine available for the most common form of the disease. Increasing evidence suggests that the mycobacterial glycolipid trehalose 6,6' dimycolate (TDM; cord factor) plays a key role in the pathogenesis of TB disease. TDM protects the TB bacilli from macrophage-mediated killing, inhibits effective antigen presentation, and reduces the formation of protective T-cell responses. TDM promotes initiation of granuloma formation and likely plays a role in caseation. Furthermore, TDM may contribute to the development of post primary disease. Receptors for TDM were recently described and are expected to contribute to our knowledge of the molecular pathogenesis of TB disease. In this manner, understanding TDM may prove promising towards development of targeted TB therapeutics to limit clinical pathologies.

Asthmatic granulomatosis: a novel disease with asthmatic and granulomatous features.

RATIONALE: Severe asthma represents 5-10% of all asthma, yet remains problematic and poorly understood. Although it is increasingly recognized as consisting of numerous heterogenous phenotypes, their immunopathology, particularly in the distal airways and interstitium, remains poorly described. OBJECTIVES: To identify the pathobiology of atypical difficult asthma. METHODS: We report 10 from a total of 19 patients (17 women and 2 men) meeting asthma and severe asthma definitions, requiring daily systemic corticosteroid (CS) use, with inconsistent abnormalities on chest computed tomography scans, who underwent video-assisted thoracoscopic biopsies for further diagnosis and management. MEASUREMENTS AND MAIN RESULTS: The pathology of 10 of the 19 cases revealed small airway changes consistent with asthma (eosinophilia, goblet cell hyperplasia), but with the unexpected finding of interstitial nonnecrotizing granulomas. These patients had no evidence for hypersensitivity pneumonitis, but 70% of cases had a personal or family history of autoimmune-like disease. The 10 cases were treated with azathioprine, mycophenolic acid, methotrexate, or infliximab. Nine of 10 showed decreased CS requirements and improved or maintained FEV(1) despite lower CS doses. Of the remaining nine patients, six manifested asthmatic small airway disease, alone or in combination with alveolar septal mononuclear cells, but no granulomas, whereas three manifested other pathologic findings (aspiration, pneumonia, or thromboemboli). CONCLUSIONS: These data suggest that a subset of severe "asthma" manifests a granulomatous pathology, which we term "asthmatic granulomatosis." Although identification of this disease currently requires a thorascopic biopsy, alternative approaches to therapy lead to improvement in outcomes.

[Investigation of remaxol efficacy in complex therapy of experimental generalized tuberculosis on mice].

Efficacy of remaxol in complex chemotherapy of generalized drug resistant tuberculosis was studied on mice. Mycobacterium tuberculosis 5419 SPBNIIF isolated from a patient with freshey diagnosticated pulmonary tuberculosis resistant to isoniazid (10 mcg/ml), rifampicin (40 mcg/ml), streptomycin (10 mcg/ml) and ethionamide (30 mcg/ml) was used in the experiments. The main polychemotherapy included 4 antituberculosis drugs in the highest therapeutic doses: isoniazid, amikacin, ethambutol and tavanic, the treatment course was 8 weeks. Remaxol was administered in a dose of 25 ml/kg intraperitoneally 5 times a week (14 injections). Significant activating effect of remaxol on the tension of the lung tissue local immunity was revealed by changes in the granuloma cell composition (from mainly epitheliod to mainly lymphoid) and by more frequent large lymphohistiocytic infiltrates. The use of remaxol also greatly increased the absorptive and digestive activity of the peritoneal macrophages phagocytosis, inhibited in the process of the experimental tuberculosis development.

Etanercept-induced cutaneous and pulmonary sarcoid-like granulomas resolving with adalimumab.

A 59-year-old female with rheumatoid arthritis on etanercept therapy presented with a 7-cm-large subcutaneous forearm mass. Multiple smaller nodules subsequently developed on the upper and lower extremities. Except for a new cough, the patient was systemically well. Biopsy of the mass showed sarcoidal type granulomatous inflammation with nodular aggregations of non-necrotizing epithelioid histiocytes in the subcutis. A chest computed tomography (CT) scan showed mediastinal adenopathy consistent with pulmonary sarcoidosis. Etanercept was discontinued, and the patient was started on adalimumab for rheumatoid arthritis control. The cutaneous nodules fully resolved in 6 months with no additional treatment. A 4-month follow-up CT scan showed significant regression of mediastinal adenopathy. The patient has since been maintained on adalimumab therapy for 2 years with no recurrence of sarcoid-like manifestations. Biologic response modifiers targeting tumor necrosis factor alpha (TNFα) are effective treatments of chronic inflammatory conditions such as rheumatoid arthritis and psoriasis. TNFα represents a major cytokine in granuloma formation, and TNFα inhibitors are sometimes efficacious in the treatment of sarcoidosis. Paradoxically, there is a small volume of literature implicating TNFα inhibitors in the development of sarcoid-like disease. We present this case to promote the recognition of TNFα inhibitor-induced sarcoidosis and to illustrate the wide clinicopathologic differential of sarcoidal type granulomas.