Идёт набор NCT07295808

Identification and Characterisation of IgA With Nephritogenic Potential in IgA Deposition Nephropathies (Rep-IgAN)

Без фазы С лечением Kidney Disease

Ориентир для пациента и семьи

Простыми словами

Автоматическая сводка по структурированным данным реестра. Она помогает сориентироваться, но не заменяет официальный протокол или оценку врача.

Что изучают: В протоколе указаны: Blood sample.
Кому может быть актуально: Состояния в реестре: Kidney Disease. Базовые параметры: от 18 лет · Все.
Что важно проверить: Возраст, диагноз и пол — только базовые ориентиры. Предыдущее лечение, анализы и другие обязательные условия указаны ниже в критериях участия.
Где проводится: Франция
Следующий шаг: Сохраните исследование, покажите его лечащему врачу и уточните актуальный статус у исследовательского центра. Расходы, документы и поездка →

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Официальное название

Identification and Characterisation of IgA With Nephritogenic Potential in IgA Deposition Nephropathies

Обзор

IgA nephropathy (IgA Nephropathy), or Berger's disease, is the most common form of primary glomerulonephritis. It is a major cause of end-stage renal failure, often leading to dialysis or kidney transplantation. Recurrence is common after transplantation, compromising graft survival. Rheumatoid purpura (or IgA vasculitis) shares a common pathophysiology with IgA N, characterised by mesangial deposits containing IgA-rich immune complexes, but differs in its systemic involvement (skin, joints and digestive system). In terms of pathophysiology, the histological signature of these conditions is based on the accumulation of abnormal IgA within the glomerulus. The mechanisms responsible for the nephrotoxicity of these IgA remain partially unclear. In patients with NIgA, several qualitative abnormalities of IgA have been well described, including a glycosylation defect that promotes IgA polymerisation and the emergence of anti-IgA autoantibodies. These immune complexes, found in glomerular deposits, induce a local inflammatory reaction. Experimental work conducted on mouse models developed at the CRIBL laboratory has shown that these abnormalities may be linked to a dysregulation of the immune response, leading to the production of IgA with physicochemical properties that promote their deposition in the kidney. However, the location of nephritogenic IgA-secreting B cells remains poorly understood. Recent data suggest that this production could occur directly within the renal parenchyma, where activated B lymphocytes would locally produce pathogenic IgA. Following on from these observations, our study aims to characterise the immunoglobulin (Ig) repertoires in patients with IgA nephropathy, particularly those from renal lymphoid infiltrates, and to compare them with the repertoires of circulating B cells. We hypothesise that certain sequence motifs within the variable domains of IgA, particularly the CDR3 regions, could constitute specific biomarkers of NIgA. Their detection in peripheral blood could enable non-invasive or predictive diagnosis, complementing the renal biopsy that is currently essential.

Вмешательства

Диагностический тест Blood sample
Blood sample taken in a Tempus tube during a blood test performed at the same time as the kidney biopsy.

Первичные конечные точки

Variable domains of IgA [Срок оценки: 6 months]

Вторичные конечные точки (1)

Direct in situ lymphoid infiltrate mapping within the kidney [Срок оценки: 6 months]

Критерии участия

Критерии включения

Patients of interest: all patients with IgA nephropathy or rheumatoid purpura aged 18 years or older whose treatment requires a renal biopsy
Control patients: all patients with a renal disease other than IgA nephropathy or rheumatoid purpura whose treatment requires a renal biopsy