Abstract
Background
Nephrotic syndrome (NS) is a common pediatric kidney disease, yet current treatments for complicated NS are only partially effective and have significant toxicity. There is no Food and Drug Administration (FDA)- or European Medicines Agency (EMA)-approved safe and effective treatment for NS. Thiazolidinediones (TZDs) have been shown to reduce proteinuria in both diabetic and non-diabetic kidney disease and in preclinical studies to directly protect podocytes from injury and reduce proteinuria. Here, we report on the potential utility of the addition of the TZD pioglitazone (PIO) to enhance proteinuria reduction in 8 children and young adults with steroid dependent NS and steroid resistant NS.
Methods
Clinical data were analyzed in comparable time periods before and after the addition of PIO to their medical regimens. Eight NS patients with minimal change NS (n = 2), focal segmental glomerulosclerosis (FSGS) (n = 4), or collapsing FSGS (n = 2) were evaluated.
Results
Prior to PIO initiation, all children and young adults had already received multiple immunosuppressive medications (mean = 3.75). Five of eight patients (63%; “Responders”) had notable proteinuria reduction within 1 month of PIO initiation (62% reduction; P = 0.04) and normalization within 6 months (97% reduction; P = 0.04). PIO-related benefits among the responders included notable increases in serum albumin (2.5 to 3.7 g/dl; P = 0.08), dramatic reductions in hospitalizations for IV albumin infusions and diuresis (11 to 0; P < 0.01), and considerable reduction in total immunosuppression (43% reduction; P > 0.1). Importantly, no patients experienced any adverse events attributable to PIO during a total of 136 patient-months of treatment.
Conclusions
While confirmatory safety and efficacy studies are needed, these findings suggest pioglitazone (a non-immunosuppressive drug) may be useful to enhance proteinuria reduction in some children and young adults with complicated NS.
Graphical Abstract
A higher resolution version of the Graphical abstract is available as Supplementary information
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Acknowledgements
The authors would like to thank Mandy Root Thompson for her expert medial illustration services and for preparing the figures for this manuscript. The authors would also like to thank Dr. Ben Brouhard and Dr. John Mahan for their critical reviews of the manuscript.
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Study design: TEH, GH, and WES; data collection: TEH, GH, KHN, YS, KM, HMB, and MH; data analysis: TEH, GH, QW, and WES; statistical analysis: TEH, GH, QW, and WES; manuscript preparation and editing: TEH, GH, KHN, YS, KM, HMB, QW, MH, and WES.
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TEH, GH, KHN, YS, KM, HMB, QW, and MH have no financial interests. WES is a co-founder of NephKey Therapeutics, Inc., and is on the Board of Directors of NephCure Kidney International and receives no compensation as a member of the Board of Directors. TEH is on the Editorial Board of Frontiers in Pediatrics and receives no compensation as a member of the Board.
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Hunley, T.E., Hidalgo, G., Ng, K.H. et al. Pioglitazone enhances proteinuria reduction in complicated pediatric nephrotic syndrome. Pediatr Nephrol 38, 1127–1138 (2023). https://doi.org/10.1007/s00467-022-05637-8
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DOI: https://doi.org/10.1007/s00467-022-05637-8