Autoantibodies production and immunological abnormalities after bariatric surgery.

OBJECTIVE: Bariatric surgery is a widely used procedure for the treatment of obesity. Our aim is to describe the main immunological changes in patients who undergo bariatric surgery. METHODS: A prospective study was conducted within a cohort of patients undergoing bariatric surgery and without previous evidence of systemic or organ-specific autoimmune diseases in whom 3 blood samples were collected - one day before surgery (Time 0), and 5 (Time 1) and 10 months (Time 2) after surgery. RESULTS: Thirty four obese patients underwent surgery (Time 0):30(88.24%) were women, mean age 38.3 years. When comparing Time 0 and Time 2, there were statistically significant changes in CD4+T cell count, with an increase from 1074/mL(IQR:860-1316) to 1217.5/mL(IQR:838-1510),p = 0.0002. The CD4/CD8 ratio increased from 2.2(IQR: 1.7-2.7) to 2.4(1.8-2.8), p = 0.0001. As for humoral variables, the C3 fraction of complement decreased from 164 ±â€¯40.6 mg/dL to 112.4 ±â€¯31.4 mg/dL(p < 0.001) and C4 decreased from 29.3 ±â€¯10.1 mg/dL to 22.5 ±â€¯7.1(p = 0.0009) at Time 2. Four patients with negative ANAs at baseline, showed positive ANAs at Time 2.One patient developed anti-citrullinated peptide antibodies >200 IU/mL at Time 2. CONCLUSIONS: Patients undergoing bariatric surgery show immunological changes which might eventually lead to develop an autoimmune disease.

Bevacizumab as a treatment for hereditary hemorrhagic telangiectasia in children: a case report.

CASE DESCRIPTION: Five-year-old female patient with hereditary hemorrhagic telangiectasia. CLINICAL FINDINGS: Deterioration of cardiopulmonary function with higher oxygen requirements secondary to pulmonary arteriovenous shunts, epistaxis. TREATMENT AND OUTCOME: The patient was treated with the monoclonal antibody bevacizumab, which inhibits the vascular endothelial growth factor, with good clinical outcome. CLINICAL RELEVANCE: Hereditary hemorrhagic telangiectasia is an autosomal dominant disorder characterized by arteriovenous malformations in different organs, making its clinical presentations varied. Systemic therapeutic options for a generalized disease are limited. The monoclonal antibody bevacizumab, seems to be a good option in this disorder. Although reported as successful in adult population, its use in pediatric population has not yet been reported. Here we report the use of bevacizumab in a 5-year-old female patient with hereditary hemorrhagic telangiectasia, showing clinical benefits and good outcome.

DESCRIPCIÓN DEL CASO: Paciente de cinco años de sexo femenino con telangiectasia hemorrágica hereditaria. HALLAZGOS CLÍNICOS: Deterioro de la función cardiopulmonar con mayores requerimientos de oxígeno secundario a shunt pulmonar arteriovenoso, epistaxis. TRATAMIENTO Y RESULTADO: La paciente fue tratada con el anticuerpo monoclonal bevacizumab, que inhibe el factor de crecimiento endotelial vascular, con buen resultado clínico. RELEVANCIA CLÍNICA: La telangiectasia hemorrágica hereditaria es un trastorno autosómico dominante caracterizado por malformaciones arteriovenosas en diferentes órganos, lo que hace que sus presentaciones clínicas varíen. Las opciones terapéuticas sistémicas para la enfermedad generalizada son limitadas. El anticuerpo monoclonal bevacizumab, parece ser una buena opción en este trastorno. Aunque se ha reportado como exitoso en la población adulta, su uso en población pediátrica aún no ha sido reportado. Aquí se informa el uso de bevacizumab en una paciente de 5 años de edad con telangiectasia hemorrágica hereditaria, mostrando beneficios clínicos y buen resultado.

Bevacizumab as a treatment for hereditary hemorrhagic telangiectasia in children: a case report / Bevacizumab como tratamiento para telangiectasia hemorrágica hereditaria en niños: Reporte de caso

Abstract Case description: Five-year-old female patient with hereditary hemorrhagic telangiectasia. Clinical Findings: Deterioration of cardiopulmonary function with higher oxygen requirements secondary to pulmonary arteriovenous shunts, epistaxis. Treatment and Outcome: The patient was treated with the monoclonal antibody bevacizumab, which inhibits the vascular endothelial growth factor, with good clinical outcome. Clinical Relevance: Hereditary hemorrhagic telangiectasia is an autosomal dominant disorder characterized by arteriovenous malformations in different organs, making its clinical presentations varied. Systemic therapeutic options for a generalized disease are limited. The monoclonal antibody bevacizumab, seems to be a good option in this disorder. Although reported as successful in adult population, its use in pediatric population has not yet been reported. Here we report the use of bevacizumab in a 5-year-old female patient with hereditary hemorrhagic telangiectasia, showing clinical benefits and good outcome.

Resumen Descripción del caso: Paciente de cinco años de sexo femenino con telangiectasia hemorrágica hereditaria. Hallazgos Clínicos: Deterioro de la función cardiopulmonar con mayores requerimientos de oxígeno secundario a shunt pulmonar arteriovenoso, epistaxis. Tratamiento y resultado: La paciente fue tratada con el anticuerpo monoclonal bevacizumab, que inhibe el factor de crecimiento endotelial vascular, con buen resultado clínico. Relevancia clínica: La telangiectasia hemorrágica hereditaria es un trastorno autosómico dominante caracterizado por malformaciones arteriovenosas en diferentes órganos, lo que hace que sus presentaciones clínicas varíen. Las opciones terapéuticas sistémicas para la enfermedad generalizada son limitadas. El anticuerpo monoclonal bevacizumab, parece ser una buena opción en este trastorno. Aunque se ha reportado como exitoso en la población adulta, su uso en población pediátrica aún no ha sido reportado. Aquí se informa el uso de bevacizumab en una paciente de 5 años de edad con telangiectasia hemorrágica hereditaria, mostrando beneficios clínicos y buen resultado.

Distinguishing infections vs flares in patients with systemic lupus erythematosus.

SLE is a chronic autoimmune disease involving multiple systems. Patients with SLE are highly susceptible to infections due to the combined effects of their immunosuppressive therapy and the abnormalities of the immune system that the disease itself causes, which can increase mortality in these patients. The differentiation of SLE activity and infection in a febrile patient with SLE is extremely difficult. Activity indexes are useful to identify patients with lupus flares but some clinical and biological abnormalities may, however, make it difficult to differentiate flares from infection. Several biological markers are now recognized as potential tools to establish the difference between SLE activity and infection, including CRP and procalcitonin. It is possible, however, that the use of only one biomarker is not sufficient to confirm or discard infection. This means that new scores, which include different biomarkers, might represent a better solution for differentiating these two clinical pictures. This review article describes several markers that are currently used, or have the potential, to differentiate infection from SLE flares.

Is Bariatric Surgery a Trigger Factor for Systemic Autoimmune Diseases?

Bariatric procedures are an effective option for weight loss and control of comorbidities in obese patients. Obesity is a proinflammatory condition in which some cytokines such as leptin, a proinflammatory protein, is elevated and adiponectin, an anti-inflammatory protein, is decreased. In patients undergoing weight reduction surgeries, these hormone levels behave paradoxically. It is not known whether bariatric surgery protects against development of autoinflammatory or autoimmune conditions; nevertheless, changes occurring in the immune system are incompletely understood. In this case series, we describe 4 patients undergoing bariatric surgery, who subsequently developed systemic autoimmune diseases. Patients in our case series were asymptomatic before surgery and developed an autoimmune disease within 11.2 months. Two women fulfilled criteria for systemic lupus erythematosus (one associated with antiphospholipid syndrome), and 2 men developed rheumatoid arthritis. A causal relationship is difficult to establish because factors that could trigger these diseases are multiple, including genetic susceptibility, time elapsed until achievement of ideal weight, and vitamin deficiencies, among others. However, clinicians must be attentive to this possible association.

Epigenetics changes associated to environmental triggers in autoimmunity.

Autoimmune diseases (AIDs) are chronic conditions initiated by the loss of immunological tolerance to self-antigens and represent a heterogeneous group of disorders that affect specific target organs or multiple organs in different systems. While the pathogenesis of AID remains unclear, its aetiology is multifunctional and includes a combination of genetic, epigenetic, immunological and environmental factors. In AIDs, several epigenetic mechanisms are defective including DNA demethylation, abnormal chromatin positioning associated with autoantibody production and abnormalities in the expression of RNA interference (RNAi). It is known that environmental factors may interfere with DNA methylation and histone modifications, however, little is known about epigenetic changes derived of regulation of RNAi. An approach to the known environmental factors and the mechanisms that alter the epigenetic regulation in AIDs (with emphasis in systemic lupus erythematosus, the prototype of systemic AID) are showed in this review.

Pneumocystis jirovecii Pneumonia in a Patient with Rheumatoid Arthritis Treated with Abatacept.

Rheumatoid arthritis (RA) is an autoimmune disease characterized by synovial membrane inflammation and joint cartilage destruction. Abatacept is a biologic agent that blocks the costimulation signals, preventing antigen presentation and proliferation of T lymphocytes. It is approved for the treatment of patients with RA. Pneumocystis jirovecii pneumonia (PJP) is an infectious disease complicating several immunosuppressive drugs. PJP associated with abatacept has not been reported yet in the medical literature. Various factors, such as the mechanism of action of abatacept, may contribute to predisposing to Pneumocystis jirovecii infection. In this paper, we report a patient with RA who developed PJP under abatacept treatment.