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Circulating plasmablasts in children with steroid-sensitive nephrotic syndrome

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Abstract

Background

The therapeutic efficacy of B cell–depleting anti-CD20 treatment in both pediatric and adult steroid-sensitive nephrotic syndromes (SSNS) suggests that B cells play a pathogenic role in the disease. In adults with minimal change disease (MCD), only circulating plasmablasts are increased during the active phase of the disease, among B cell subsets. These cells have not been studied yet in children with SSNS.

Methods

We retrospectively quantified by flow cytometry analysis circulating plasmablasts in 107 pediatric patients with SSNS (51 at disease onset, 27 during relapse, and 29 in remission). Data were compared with an equal number of age- and sex-matched healthy donors (HD).

Results

Circulating plasmablast levels, expressed as percentage of total CD19+ B cells or as percentage of total lymphocytes, were normal in all SSNS subgroups, compared to HD. Patients in remission had significantly fewer circulating plasmablasts compared to patients at disease onset. No significant correlation was observed between plasmablast levels and proteinuria or serum proteins, at onset. Treatment with prednisone and mycophenolate mofetil significantly reduced circulating levels of plasmablasts, unlike treatment with prednisone and calcineurin inhibitors.

Conclusions

The B cell phenotype of children with SSNS differs from that of adults with MCD. This may justify different therapeutic approaches.

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Data availability

The datasets generated during and/or analyzed during the current study are available from the corresponding author on reasonable request.

Code availability

Not applicable.

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Funding

MV and MC were supported by Associazione per la Cura del Bambino Nefropatico-Onlus and Ricerca Corrente of the Italian Ministry of Health.

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Correspondence to Manuela Colucci.

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Ethics approval

The study was approved by Bambino Gesù Children’s Hospital Ethics Committee and was conducted in compliance with the declaration of Helsinki.

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Written informed consent on behalf of the minors/children enrolled was obtained from parents.

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Not applicable.

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The authors declare that they have no conflict of interest.

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Federica Zotta and Marina Vivarelli contributed equally to the study

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Zotta, F., Vivarelli, M., Carsetti, R. et al. Circulating plasmablasts in children with steroid-sensitive nephrotic syndrome. Pediatr Nephrol 37, 455–459 (2022). https://doi.org/10.1007/s00467-021-05273-8

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  • DOI: https://doi.org/10.1007/s00467-021-05273-8

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