ABSTRACT
We describe a twenty six years old lady with tuberculous meningitis who developed new onset left ptosis and binocular diplopia with features of left fascicular 3rd nerve palsy after 9 months of anti tubercular therapy (ATT) and imaging revealed new onset tuberculoma in the mid-brain. Tuberculoma responded to steroids while continuing ATT. Formation of new tuberculoma as a part of immune reconstitution inflammatory syndrome (IRIS) is possible even after prolonged therapy of 9 months, which responded well to only steroids without altering ATT.
Subject(s)
Antitubercular Agents/therapeutic use , Immune Reconstitution Inflammatory Syndrome/diagnosis , Mesencephalon/diagnostic imaging , Tuberculoma, Intracranial/diagnosis , Tuberculosis, Meningeal/drug therapy , Adult , Blepharoptosis/physiopathology , Diplopia/physiopathology , Female , Glucocorticoids/therapeutic use , Humans , Immune Reconstitution Inflammatory Syndrome/drug therapy , Immune Reconstitution Inflammatory Syndrome/physiopathology , Oculomotor Nerve Diseases/physiopathology , Time Factors , Tuberculoma, Intracranial/drug therapy , Tuberculoma, Intracranial/physiopathologyABSTRACT
Cryptococcal meningitis is a fungal infection that is most commonly thought of as an opportunistic infection affecting immunocompromised patients, classically patients with Human Immunodeficiency (HIV) infection. It is associated with a variety of complications including disseminated disease as well as neurologic complications including intracranial hypertension, cerebral infarcts, vision loss and other neurologic deficits. It is diagnosed by lumbar puncture with CSF studies, including fungal culture and cryptococcal antigen testing. We present a case of cryptococcal meningitis and fungemia in a previously healthy male patient who presented after multiple emergency department visits with persistent headache. After multiple visits, he underwent a lumbar puncture consistent with cryptococcal infection, and he was admitted to the hospital for initiation of antifungal therapy. His workup revealed no known underlying condition leading to immune compromise.
Subject(s)
Delayed Diagnosis , Fungemia/diagnosis , Headache/physiopathology , Immunocompetence , Intracranial Hypertension/diagnosis , Meningitis, Cryptococcal/diagnosis , Adult , Amphotericin B/therapeutic use , Antifungal Agents/therapeutic use , Culture Techniques , Fluconazole/therapeutic use , Flucytosine/therapeutic use , Fungemia/complications , Fungemia/drug therapy , Fungemia/physiopathology , Headache/etiology , Humans , Immune Reconstitution Inflammatory Syndrome/diagnosis , Immune Reconstitution Inflammatory Syndrome/physiopathology , Intensive Care Units , Intracranial Hypertension/etiology , Intracranial Hypertension/surgery , Male , Meningitis, Cryptococcal/complications , Meningitis, Cryptococcal/drug therapy , Meningitis, Cryptococcal/physiopathology , Papilledema , Respiratory Insufficiency/etiology , Respiratory Insufficiency/therapy , Spinal Puncture , Ventriculoperitoneal ShuntABSTRACT
We present a rare case of post-antiretroviral therapy (ART) paradoxically worsening of radiological findings in a patient with advanced HIV-infection on treatment for Rhodococcus pneumonia who was misdiagnosed with pulmonary tuberculosis. Despite clinical improvement, serial chest radiographs showed deteriorations a month after starting ART. This was attributed to Immune Reconstitution Inflammatory Syndrome (IRIS) which spontaneously resolved without any treatment.
Subject(s)
Actinomycetales Infections/diagnosis , Anti-Retroviral Agents/therapeutic use , HIV Infections/drug therapy , Immune Reconstitution Inflammatory Syndrome/physiopathology , Radiography, Thoracic , Rhodococcus , Adult , Diagnostic Errors , Humans , Immune Reconstitution Inflammatory Syndrome/diagnostic imaging , Male , Outcome Assessment, Health CareABSTRACT
Tuberculosis associated Immune reconstitution inflammatory syndrome (IRIS) in a HIV negative patient can present with a multitude of clinic-radiological presentations that are often confused with drug resistance/treatment failure. Being a diagnosis of exclusion, this clinical entity is often prone to under-diagnosis. We present a series of 5 patients who presented with varied but uncommon IRIS manifestations. High index of suspicion coupled with clinical reasoning and judicious use of phenotypic and genotypic culture methods helped in their timely detection and successful treatment.
Subject(s)
Immune Reconstitution Inflammatory Syndrome/diagnosis , Middle Lobe Syndrome/diagnostic imaging , Tuberculoma, Intracranial/diagnostic imaging , Tuberculosis, Multidrug-Resistant/diagnosis , Tuberculosis, Pulmonary/diagnosis , Adolescent , Adult , Antitubercular Agents/therapeutic use , Cough/physiopathology , Drug Resistance, Bacterial/genetics , Dyspnea/physiopathology , Glucocorticoids/therapeutic use , Humans , Immune Reconstitution Inflammatory Syndrome/drug therapy , Immune Reconstitution Inflammatory Syndrome/physiopathology , Male , Middle Aged , Middle Lobe Syndrome/drug therapy , Mycobacterium tuberculosis/genetics , Nucleic Acid Amplification Techniques , Paresis/physiopathology , Pleural Effusion/physiopathology , Prednisone/therapeutic use , Tomography, X-Ray Computed , Tuberculoma, Intracranial/drug therapy , Tuberculoma, Intracranial/physiopathology , Tuberculosis, Multidrug-Resistant/drug therapy , Tuberculosis, Pulmonary/drug therapy , Young AdultSubject(s)
Exanthema/etiology , HIV Infections/complications , Immune Reconstitution Inflammatory Syndrome/chemically induced , Immune Reconstitution Inflammatory Syndrome/etiology , Isoniazid/adverse effects , Adult , Antiretroviral Therapy, Highly Active , CD4 Lymphocyte Count , Diagnosis, Differential , HIV Infections/drug therapy , Humans , Immune Reconstitution Inflammatory Syndrome/physiopathology , Male , Scabies/complications , Scabies/diagnosisABSTRACT
We performed a retrospective study involving 21 patients with chronic disseminate candidiasis (CDC) and 38 patients with candidemia. Neutropenia of >2 weeks' duration was more common in those with CDC (71%) than in those with candidemia (26%, P < .001), and the azole-resistant rate in patients with CDC (5%) was lower than that in those with candidemia (29%, P = .03). Of the 21 patients with CDC, five (24%) needed adjuvant corticosteroid therapy due to persistent debilitating fever (median, 19 days). Rapid defervescence (median, 5 days) occurred after adjuvant corticosteroid therapy. However, there were no significant differences in 90-day mortality between CDC patients with and without corticosteroid therapy. Further prospective data are needed to define the role of steroids in this setting.
Subject(s)
Adrenal Cortex Hormones/therapeutic use , Antifungal Agents/therapeutic use , Candidiasis/diagnosis , Candidiasis/drug therapy , Adjuvants, Immunologic/therapeutic use , Adult , Candida/classification , Candidemia/diagnosis , Candidemia/drug therapy , Candidemia/microbiology , Candidemia/physiopathology , Candidiasis/microbiology , Candidiasis/physiopathology , Chronic Disease , Combined Modality Therapy , Drug Resistance, Fungal , Female , Fever/drug therapy , Humans , Immune Reconstitution Inflammatory Syndrome/drug therapy , Immune Reconstitution Inflammatory Syndrome/physiopathology , Male , Middle Aged , Neutropenia/complications , Opportunistic Infections/diagnosis , Opportunistic Infections/drug therapy , Opportunistic Infections/microbiology , Opportunistic Infections/physiopathology , Retrospective Studies , Treatment OutcomeABSTRACT
The tuberculosis (TB) and HIV syndemic continues to rage and are a major public health concern worldwide. This deadly association raises complexity and represent a significant barrier towards TB elimination. TB continues to be the leading cause of death amongst HIV-infected people. This paper reports the challenges that lay ahead and outlines some of the current and future strategies that may be able to address this co-epidemic efficiently. Improved diagnostics, cheaper and more effective drugs, shorter treatment regimens for both drug-sensitive and drug-resistant TB are discussed. Also, special topics on drug interactions, TB-IRIS and TB relapse are also described. Notwithstanding the defeats and meagre investments, diagnosis and management of the two diseases have seen significant and unexpected improvements of late. On the HIV side, expansion of ART coverage, development of new updated guidelines aimed at the universal treatment of those infected, and the increasing availability of newer, more efficacious and less toxic drugs are an essential element to controlling the two epidemics. On the TB side, diagnosis of MDR-TB is becoming easier and faster thanks to the new PCR-based technologies, new anti-TB drugs active against both sensitive and resistant strains (i.e. bedaquiline and delamanid) have been developed and a few more are in the pipeline, new regimens (cheaper, shorter and/or more effective) have been introduced (such as the "Bangladesh regimen") or are being tested for MDR-TB and drug-sensitive-TB. However, still more resources will be required to implement an integrated approach, install new diagnostic tests, and develop simpler and shorter treatment regimens.
Subject(s)
HIV Infections/epidemiology , Tuberculosis/epidemiology , Anti-HIV Agents/pharmacokinetics , Anti-HIV Agents/therapeutic use , Antitubercular Agents/pharmacokinetics , Antitubercular Agents/therapeutic use , Bacteriological Techniques , Clinical Trials as Topic , Comorbidity , Disease Management , Disease Reservoirs , Drug Interactions , Drug Resistance, Multiple, Bacterial , HIV Infections/drug therapy , Humans , Immune Reconstitution Inflammatory Syndrome/physiopathology , Immune Reconstitution Inflammatory Syndrome/therapy , Latent Tuberculosis/diagnosis , Latent Tuberculosis/drug therapy , Mass Screening/methods , Mycobacterium tuberculosis/drug effects , Tuberculosis/diagnosis , Tuberculosis/drug therapy , Tuberculosis/prevention & control , Tuberculosis, Multidrug-Resistant/drug therapy , Tuberculosis, Multidrug-Resistant/epidemiologyABSTRACT
Background. Fungal infections have been commonly diagnosed in individuals with advanced HIV disease. Cryptococcosis, pneumocystosis, and histoplasmosis are the most frequent systemic mycoses in people suffering from HIV/AIDS. Case report. We report a case of multiple fungal infections in an advanced AIDS-patient. A 33-year-old HIV-positive man from Brazil was hospitalized due to diarrhea, dyspnea, emaciation, hypoxemia, extensive oral thrush, and a CD4+ T lymphocyte count of 20 cells/mm3. Honeycombed-structures consistent with Pneumocystis jirovecii were observed by direct immunofluorescence in induced sputum. Cryptococcus neoformans was recovered from respiratory secretion and cerebrospinal fluid cultures. Histopathology of the bone marrow also revealed the presence of Histoplasma capsulatum. Molecular assays were performed in a sputum sample. Nested-PCR confirmed the presence of P. jirovecii and H. capsulatum; qPCR multiplex was positive for C. neoformans and H. capsulatum. With the treatment of antifungal drugs the patient progressed satisfactorily. Conclusions. The diagnosis of several systemic mycoses demonstrates the vulnerability of advanced AIDS-patients. Thus, the detection of AIDS cases in the early stages of infection is necessary for a prompt and adequate introduction of HAART therapy, and the use of prophylaxis to control opportunistic infections (AU)
Antecedentes. Las infecciones fúngicas se han diagnosticado comúnmente en individuos con enfermedad avanzada por VIH. La criptococosis, la neumocistosis y la histoplasmosis son las micosis sistémicas más frecuentes en personas con VIH/sida. Caso clínico. En este trabajo se describe un caso de múltiples infecciones fúngicas en un paciente con sida avanzado. Un hombre de 33 años, brasileño, con serología positiva para VIH, fue hospitalizado con pérdida de peso, diarrea, disnea, caquexia, hipoxemia, extensa candidiasis oral y recuento de linfocitos CD4+ de 20 cél./mm3. La inmunofluorescencia directa puso de manifiesto estructuras típicas compatibles con Pneumocystis jirovecii. En el cultivo de las muestras de secreción respiratoria y de líquido cefalorraquídeo creció Cryptococcus neoformans. En el análisis histopatológico de una muestra de médula ósea se observó Histoplasma capsulatum. Se llevaron a cabo ensayos de marcadores moleculares en una muestra de esputo. Se realizó un ensayo de PCR anidada que fue positivo para P. jirovecii y H. capsulatum, y una qPCR multiplex que fue positiva para C. neoformans e H. capsulatum. Con un tratamiento con antimicóticos el paciente evolucionó satisfactoriamente. Conclusiones. El diagnóstico de las micosis sistémicas demuestra la vulnerabilidad de los pacientes con sida avanzado. El diagnóstico de la infección por VIH en sus etapas iniciales es fundamental para la introducción precoz y adecuada de la terapia antirretroviral altamente activa y la profilaxis de las infecciones oportunistas (AU)
Subject(s)
Humans , Male , Child , AIDS-Related Opportunistic Infections/complications , AIDS-Related Opportunistic Infections/diagnosis , AIDS-Related Opportunistic Infections/microbiology , Pneumonia, Pneumocystis/complications , Pneumonia, Pneumocystis/drug therapy , Histoplasmosis/complications , Histoplasmosis/drug therapy , Immune Reconstitution Inflammatory Syndrome/complications , Immune Reconstitution Inflammatory Syndrome/microbiology , Antifungal Agents/therapeutic use , AIDS-Related Opportunistic Infections/drug therapy , AIDS-Related Opportunistic Infections/physiopathology , Immune Reconstitution Inflammatory Syndrome/physiopathology , Immune Reconstitution Inflammatory Syndrome/drug therapyABSTRACT
BACKGROUND: HIV-infected patients with pulmonary TB (pTB) can have worsening of respiratory symptoms as part of TB-immune reconstitution inflammatory syndrome (TB-IRIS) following antiretroviral therapy (ART) initiation. Thus, reconstitution of immune function on ART could drive incident lung damage in HIV/TB. METHODS: We hypothesized that increases in matrix metalloproteinases (MMPs), which can degrade lung matrix, on ART are associated with TB-IRIS among a cohort of advanced, ART naïve, HIV-infected adults with pTB. Furthermore, we related early changes in immune measures and MMPs on ART to lung function in an exploratory subset of patients post-TB cure. This study was nested within a prospective cohort study. Rank sum and chi-square tests, Spearman's correlation coefficient, and logistic regression were used for analyses. RESULTS: Increases in MMP-8 following ART initiation were independently associated with TB-IRIS (p = 0.04; adjusted odds ratio 1.5 [95% confidence interval: 1.0-2.1]; n = 32). Increases in CD4 counts and MMP-8 on ART were also associated with reduced forced expiratory volume in one-second post-TB treatment completion (r = - 0.7, p = 0.006 and r = - 0.6, p = 0.02, respectively; n = 14). CONCLUSIONS: ART-induced MMP increases are associated with TB-IRIS and may affect lung function post-TB cure. End-organ damage due to TB-IRIS and mechanisms whereby immune restoration impairs lung function in pTB deserve further investigation.
Subject(s)
Coinfection , HIV Infections/complications , Immune Reconstitution Inflammatory Syndrome/etiology , Immune Reconstitution Inflammatory Syndrome/metabolism , Matrix Metalloproteinases/metabolism , Tuberculosis, Pulmonary/complications , Adult , Antiretroviral Therapy, Highly Active , Case-Control Studies , Female , HIV Infections/diagnosis , HIV Infections/drug therapy , Humans , Immune Reconstitution Inflammatory Syndrome/physiopathology , Immunity, Cellular , Male , Middle Aged , Respiratory Function Tests , T-Lymphocyte Subsets/immunology , T-Lymphocyte Subsets/metabolismABSTRACT
PURPOSE OF REVIEW: This article explores new data from recent studies addressing the role of coinfections in immune activation in HIV-1-infected patients, with a focus on immune reconstitution inflammatory syndrome (IRIS), an aberrant inflammatory response occurring shortly after antiretroviral therapy (ART) initiation. RECENT FINDINGS: Chronic HIV infection is associated with several coinfections that contribute to immune activation in various settings including early after ART initiation in the most noticeable form of IRIS and also in chronic-treated infection, with chronic viral infections like cytomegalovirus and hepatitis C or hepatitis B virus contributing to immune activation and also morbidity and mortality. Expanding on older studies, the role of T cells in IRIS has been further elucidated with evidence of more pronounced effector activity in patients with IRIS that may be leading to excessive tissue disorder. Newer studies are also continuing to shed light on the role of myeloid cells as well as the contribution of antigen load in IRIS. In addition, preliminary data are beginning to suggest a possible role of inflammasome formation in IRIS. In cryptococcal IRIS, the role of activated immune cells (T cell and myeloid) and biomarkers were evaluated in more detail at the site of infection (cerebrospinal fluid). Finally, important differences of patients developing IRIS versus those who die from tuberculosis despite ART initiation were reported, a distinction that may have important implications for participant selection in studies aiming to prevent IRIS with immunosuppressive agents. SUMMARY: Better understanding of the role of opportunistic infections at ART initiation and IRIS pathogenesis will assist in improved strategies for prevention and treatment. The long-term consequences of IRIS remain unclear. Chronic viral coinfections with herpesviruses and hepatitis C virus are important factors in persistent immune activation in chronic-treated HIV.
Subject(s)
Coinfection , HIV Infections , Immune Reconstitution Inflammatory Syndrome , Biomarkers , HIV Infections/complications , HIV Infections/immunology , HIV Infections/physiopathology , Humans , Immune Reconstitution Inflammatory Syndrome/complications , Immune Reconstitution Inflammatory Syndrome/immunology , Immune Reconstitution Inflammatory Syndrome/physiopathology , Immunity, InnateABSTRACT
BACKGROUND: The immunopathogenesis of paradoxical tuberculosis-associated immune reconstitution inflammatory syndrome (TB-IRIS) remains unclear. We determined the association between pathogen-specific T-cell responses and development of paradoxical TB-IRIS on antiretroviral therapy (ART). METHODS: This study was nested within a prospective cohort study of HIV-infected patients with active pulmonary tuberculosis and baseline CD4 counts ≤125 cells/µL initiating ART. T-cell immune activation (CD38, HLA-DR, and PD-1 expression), phenotype, and polyfunctional pathogen-specific cellular immune responses prior to and 4 weeks after ART initiation were determined by flow cytometry. Patients with TB-IRIS were compared to non-IRIS controls using χ(2) and rank-sum tests and logistic regression. RESULTS: TB-IRIS patients and controls had similar CD4 counts, levels of T-cell-associated immune activation, frequencies of T-cell memory subsets, and frequencies of interferon gamma (IFN-γ(+))/interleukin 2 (IL-2(+))/tumor necrosis factor alpha (TNF-α(+)) CD4(+) T-cells prior to ART initiation. After ART initiation, cellular immune activation and T-cell subsets also were similar in TB-IRIS patients and controls. In contrast, TB-IRIS patients had significantly greater early increases in the frequency of tuberculosis-specific polyfunctional IFN-γ(+)/IL-2(+)/TNF-α(+) CD4(+) T-cells on ART (P = .02); each quartile increase in the percentage of these cells was independently associated with a 2.8-fold increased risk of TB-IRIS (95% confidence interval, 1.1 to 7.5-fold). In a secondary analysis, patients with TB-IRIS had rapid, concomitant increases in tuberculosis-specific adaptive immune responses and interleukin 6 (IL-6) levels, whereas controls with similarly rapid increases in cellular immune function had IL-6 levels that tended to decrease on ART. CONCLUSIONS: Rapid expansion of tuberculosis-specific polyfunctional CD4(+) T-cell responses, likely linked to increases in IL-6, is associated with development of paradoxical TB-IRIS.
Subject(s)
CD4-Positive T-Lymphocytes/immunology , HIV Infections/immunology , Immune Reconstitution Inflammatory Syndrome/immunology , Immune Reconstitution Inflammatory Syndrome/physiopathology , Interleukin-6/blood , Lymphocyte Activation/immunology , Mycobacterium tuberculosis/immunology , Tuberculosis, Pulmonary/immunology , Adult , Aged , Anti-HIV Agents/adverse effects , Anti-HIV Agents/therapeutic use , Antiretroviral Therapy, Highly Active/adverse effects , Botswana/epidemiology , CD4 Lymphocyte Count , Coinfection/drug therapy , Coinfection/immunology , Coinfection/microbiology , Coinfection/virology , Female , Flow Cytometry , HIV Infections/drug therapy , HIV Infections/epidemiology , Humans , Immune Reconstitution Inflammatory Syndrome/epidemiology , Immune Reconstitution Inflammatory Syndrome/mortality , Immunity, Cellular , Male , Middle Aged , Prospective Studies , Tuberculosis, Pulmonary/drug therapy , Young AdultABSTRACT
PURPOSE OF REVIEW: Cryptococcal meningitis causes significant mortality among HIV-infected patients, despite antifungal therapy and use of antiretroviral therapy (ART). In patients with cryptococcal meningitis, ART is often complicated by immune reconstitution inflammatory syndrome (IRIS), manifesting as unmasking of previously unrecognized subclinical infection (unmasking CM-IRIS) or paradoxical worsening of symptoms in the central nervous system after prior improvement with antifungal therapy (paradoxical CM-IRIS). We review our current understanding of the pathogenesis of this phenomenon, focusing on unifying innate and adaptive immune mechanisms leading to the development of this often fatal syndrome. RECENT FINDINGS: We propose that HIV-associated CD4 T-cell depletion, chemokine-driven trafficking of monocytes into cerebrospinal fluid in response to cryptococcal meningitis, and poor localized innate cytokine responses lead to inadequate cryptococcal killing and clearance of the fungus. Subsequent ART-associated recovery of T-cell signaling and restored cytokine responses, characterized by IFN-γ production, triggers an inflammatory response. The inflammatory response triggered by ART is dysregulated because of impaired homeostatic and regulatory mechanisms, culminating in the development of CM-IRIS. SUMMARY: Despite our incomplete understanding of the immunopathogenesis of CM-IRIS, emerging data exploring innate and adaptive immune responses could be exploited to predict, prevent and manage CM-IRIS and associated morbid consequences.
Subject(s)
AIDS-Related Opportunistic Infections/physiopathology , Anti-HIV Agents/therapeutic use , Antifungal Agents/therapeutic use , Immune Reconstitution Inflammatory Syndrome/immunology , Meningitis, Cryptococcal/physiopathology , AIDS-Related Opportunistic Infections/drug therapy , AIDS-Related Opportunistic Infections/immunology , Adaptive Immunity , CD4-Positive T-Lymphocytes/immunology , Humans , Immune Reconstitution Inflammatory Syndrome/drug therapy , Immune Reconstitution Inflammatory Syndrome/physiopathology , Immunity, Innate , Meningitis, Cryptococcal/drug therapy , Meningitis, Cryptococcal/immunology , Risk FactorsABSTRACT
BACKGROUND: Tuberculosis-associated immune reconstitution inflammatory syndrome (TB-IRIS) is a substantial problem in HIV/TB coinfected patients commencing antiretroviral therapy (ART). The immunopathogenesis of TB-IRIS includes increased production of proinflammatory chemokines and cytokines, including interleukin-18, which is a signature cytokine of the nucleotide-binding domain and leucine-rich repeat pyrin containing protein-3 inflammasome. We compared plasma levels of interleukin-18 and other biomarkers of monocyte/macrophage activation in the prediction and characterization of TB-IRIS. METHODS: Biomarkers were assayed pre-ART and during TB-IRIS, or equivalent time-point, in a case-control study of Malaysian HIV patients with paradoxical or unmasking TB-IRIS (nâ=â15), TB no IRIS (nâ=â14), and no TB or IRIS (nâ=â15). Findings for interleukin-18 were verified in another cohort of patients with paradoxical TB-IRIS (nâ=â26) and their controls (nâ=â22) from India. RESULTS: Interleukin-18 was higher in TB-IRIS patients pre-ART and during the event in both Malaysian patients (Pâ<â0.0001) and Indian patients (Pâ<â0.01). CXCL10 was higher pre-ART (Pâ<â0.001), mainly in paradoxical TB-IRIS patients, and during TB-IRIS (Pâ<â0.001), whereas CXCL8 was only higher during TB-IRIS (Pâ<â0.001). Soluble(s) CD14 was increased in all patients with HIV/TB coinfection pre-ART and during TB-IRIS or equivalent time-point, compared with patients without TB. In contrast, interferon-γ was lower before and during TB-IRIS. By receiver operating curve analysis, CXCL10, and/or interleukin-18 pre-ART were predictive of TB-IRIS. CONCLUSION: Plasma interleukin-18 levels pre-ART are candidate biomarkers for predicting paradoxical and unmasking TB-IRIS and should be investigated for risk stratification and elucidation of disease pathogenesis.
Subject(s)
HIV Infections/immunology , Immune Reconstitution Inflammatory Syndrome/immunology , Immunity, Innate/immunology , Interleukin-18/immunology , Tuberculosis/immunology , Adult , Anti-HIV Agents/therapeutic use , Antigens, Bacterial/immunology , Antitubercular Agents/therapeutic use , Biomarkers/blood , CD4 Lymphocyte Count , Coinfection , Female , HIV Infections/blood , HIV Infections/physiopathology , Humans , Immune Reconstitution Inflammatory Syndrome/physiopathology , Interleukin-18/blood , Male , Prospective Studies , Tuberculosis/blood , Tuberculosis/physiopathologyABSTRACT
We sought to characterize perfusion patterns of progressive multifocal leukoencephalopathy lesions by arterial spin labelling perfusion magnetic resonance imaging and to analyse their association with immune reconstitution inflammatory syndrome, and survival. A total of 22 patients with progressive multifocal leukoencephalopathy underwent a clinical evaluation and magnetic resonance imaging of the brain within 190 days of symptom onset. The presence of immune reconstitution inflammatory syndrome was determined based on clinical and laboratory criteria. Perfusion within progressive multifocal leukoencephalopathy lesions was determined by arterial spin labelling magnetic resonance imaging. We observed intense hyperperfusion within and at the edge of progressive multifocal leukoencephalopathy lesions in a subset of subjects. This hyperperfusion was quantified by measuring the fraction of lesion volume showing perfusion in excess of twice normal appearing grey matter. Hyperperfused lesion fraction was significantly greater in progressive multifocal leukoencephalopathy progressors than in survivors (12.8% versus 3.4% P = 0.02) corresponding to a relative risk of progression for individuals with a hyperperfused lesion fraction ≥ 4.0% of 9.1 (95% confidence interval of 1.4-59.5). The presence of hyperperfusion was inversely related to the occurrence of immune reconstitution inflammatory syndrome at the time of scan (P = 0.03). Indeed, within 3 months after symptom onset, hyperperfusion had a positive predictive value of 88% for absence of immune reconstitution inflammatory syndrome. Arterial spin labelling magnetic resonance imaging recognized regions of elevated perfusion within lesions of progressive multifocal leukoencephalopathy. These regions might represent virologically active areas operating in the absence of an effective adaptive immune response and correspond with a worse prognosis.
Subject(s)
Immune Reconstitution Inflammatory Syndrome/pathology , Leukoencephalopathy, Progressive Multifocal/pathology , Adult , Aged , Disease Progression , Female , Humans , Immune Reconstitution Inflammatory Syndrome/diagnosis , Immune Reconstitution Inflammatory Syndrome/physiopathology , Leukoencephalopathy, Progressive Multifocal/diagnosis , Leukoencephalopathy, Progressive Multifocal/physiopathology , Magnetic Resonance Imaging , Male , Middle Aged , Multimodal Imaging , Perfusion Imaging , Predictive Value of Tests , Young AdultABSTRACT
Progressive multifocal leukoencephalopathy causes an infection of the central nervous system by JC virus (JCV), a polyomavirus that destroys oligodendrocytes and their myelin processes. Here, we describe a patient with AIDS who developed a progressive multifocal leucoencephalopathy with the clinical and neuroimaging characteristics of the immune inflammatory reconstitution syndrome. Unlike other opportunistic infections, this disease can present when CD4 T cell counts are higher than those associated with AIDS and also when patients are receiving combined antiretroviral therapy. Clinical suspicion of this form of the disease is based on clinical examination that shows focal neurological deficits associated with magnetic resonance images findings. The histopathological examination of brain biopsy smears and the identification of JCV in cerebrospinal fluid or brain tissue are definitive for the diagnosis.
Subject(s)
Acquired Immunodeficiency Syndrome/complications , Immune Reconstitution Inflammatory Syndrome/physiopathology , Leukoencephalopathy, Progressive Multifocal/diagnosis , Leukoencephalopathy, Progressive Multifocal/etiology , Adult , Astrocytes/pathology , Brain/pathology , Humans , Magnetic Resonance Imaging , MaleABSTRACT
Chronic immune activation is a major complication of antiretroviral therapy (ART) for HIV infection and can cause a devastating immune reconstitution inflammatory syndrome (IRIS) in the brain. The mechanism of T-cell activation in this population is not well understood. We found HIV-Tat protein and IL-17-expressing mononuclear cells in the brain of an individual with IRIS. Tat was also present in the CSF of individuals virologically controlled on ART. Hence we examined if Tat protein could directly activate T cells. Tat transcriptionally dysregulated 94 genes and induced secretion of 11 cytokines particularly activation of IL-17 signaling pathways supporting the development of a proinflammatory state. Tat increased IL-17 transcription and secretion in T cells. Tat entered the T cells rapidly by clathrin-mediated endocytosis and localized to both the cytoplasm and the nucleus. Tat activated T cells through a nonclassical pathway dependent upon vascular endothelial growth factor receptor-2 and downstream secondary signaling pathways but independent of the T-cell receptor. However, Tat stimulation of T cells did not induce T-cell proliferation but increased viral infectivity. This study demonstrates Tat's role as a virulence factor, by driving T-cell activation and contributing to IRIS pathophysiology. This supports the necessity of an anti-Tat therapy in conjunction with ART and identifies multiple targetable pathways to prevent Tat-mediated T-cell activation.
Subject(s)
Anti-Retroviral Agents/adverse effects , Gene Expression Regulation, Viral/immunology , HIV Infections/drug therapy , Immune Reconstitution Inflammatory Syndrome/physiopathology , Signal Transduction/immunology , Virulence Factors/metabolism , tat Gene Products, Human Immunodeficiency Virus/metabolism , Anti-Retroviral Agents/therapeutic use , Brain/metabolism , Enzyme-Linked Immunosorbent Assay , Flow Cytometry , Humans , Immune Reconstitution Inflammatory Syndrome/etiology , Immune Reconstitution Inflammatory Syndrome/immunology , Immunoblotting , Interleukin-17/metabolism , Leukocytes, Mononuclear/metabolism , Lymphocyte Activation/immunology , Microarray Analysis , T-Lymphocytes/immunology , Virulence Factors/cerebrospinal fluid , tat Gene Products, Human Immunodeficiency Virus/cerebrospinal fluidABSTRACT
BACKGROUND: The role of T-cell responses against Mycobacterium tuberculosis antigens in tuberculosis-associated immune reconstitution inflammatory syndrome (TB-IRIS) is unclear. METHODS: Peripheral blood mononuclear cells from 45 HIV patients with treated TB, of whom 12 developed TB-IRIS, were collected at weeks 0, 2, and 6 of antiretroviral therapy (ART). Production of interferon-gamma (IFN-γ) and interleukin-2 by T cells after stimulation with purified protein derivative (PPD) or early secretory antigenic target-6 (ESAT-6) and T-cell expressions of CCR5 and CXCR3 were assessed by flow cytometry. IFN-γ and CXCL10 were assayed by enzyme-linked immunosorbent assay. RESULTS: TB-IRIS patients had higher proportions of PPD- and ESAT-6-reactive IFN-γâºCD4⺠and CD3âºCD4â» T cells at weeks 0, 2, and 6. IFN-γ levels were also higher in peripheral blood mononuclear cell culture supernatants at all times with PPD but only at weeks 2 and 6 with ESAT-6. There were few differences for interleukin-2. CXCL10 levels in supernatants after PPD and ESAT-6 stimulation were only higher at week 6. CXCR3âº/CCR5âºCD4⺠T cells were higher at week 2, and CCR5âºCD4⺠T cells were higher at week 6. CONCLUSIONS: TB-IRIS is associated with Th1 responses against M. tuberculosis antigens by CD4⺠and CD3âºCD4â» T cells that are present before ART and amplified afterward. It is unclear if these cause immunopathology or reflect a high pathogen load.
Subject(s)
AIDS-Related Opportunistic Infections/immunology , Anti-HIV Agents/administration & dosage , Antigens, Bacterial/immunology , HIV Infections/drug therapy , HIV Infections/immunology , Immune Reconstitution Inflammatory Syndrome/immunology , Th1 Cells/immunology , Tuberculosis/immunology , AIDS-Related Opportunistic Infections/physiopathology , Adult , CD3 Complex/metabolism , CD4-Positive T-Lymphocytes/metabolism , CD8-Positive T-Lymphocytes/metabolism , Cell Movement/drug effects , Chemokine CXCL10/metabolism , Female , Flow Cytometry , HIV Infections/physiopathology , Humans , Immune Reconstitution Inflammatory Syndrome/physiopathology , India/epidemiology , Interferon-gamma/metabolism , Interleukin-10/metabolism , Interleukin-2/metabolism , Male , Prospective Studies , Receptors, CCR5/metabolism , Receptors, CXCR3/metabolism , Tuberculosis/physiopathologySubject(s)
Acquired Immunodeficiency Syndrome/physiopathology , Deafness/physiopathology , Encephalitis, Viral/physiopathology , Immune Reconstitution Inflammatory Syndrome/physiopathology , Acquired Immunodeficiency Syndrome/complications , Acquired Immunodeficiency Syndrome/drug therapy , Acquired Immunodeficiency Syndrome/immunology , Acute Disease , Adult , Anti-HIV Agents/therapeutic use , Deafness/complications , Deafness/drug therapy , Deafness/immunology , Drug Therapy, Combination , Encephalitis, Viral/complications , Encephalitis, Viral/drug therapy , Encephalitis, Viral/immunology , Female , Humans , Immune Reconstitution Inflammatory Syndrome/complications , Immune Reconstitution Inflammatory Syndrome/drug therapy , Immune Reconstitution Inflammatory Syndrome/immunology , Recovery of FunctionABSTRACT
We report the case of a woman with natalizumab-treated multiple sclerosis (MS) and clinically silent progressive multifocal leukoencephalopathy (PML) with an unusually long preclinical phase, followed by acute symptoms due to development of immune reconstitution inflammatory syndrome (IRIS). Furthermore, the course of the IRIS was prolonged and continued to progress even five months after natalizumab treatment was ceased. This case shows that PML and IRIS can have a considerably variable course in natalizumab-treated MS patients and underlines the need for PML screening in JC virus antibody-positive patients in order to detect clinically silent cases.