Nephron Number and Time to Remission in Steroid-Sensitive Minimal Change Disease

Overview

Journal Kidney Med

Specialty Nephrology

Date 2020 Oct 23

PMID 33094274

Citations 3

Authors

Takaya Sasaki

Nobuo Tsuboi

Hirokazu Marumoto

Yusuke Okabayashi

Kotaro Haruhara

Go Kanzaki

Kentaro Koike

Makoto Ogura

Toshiharu Ninomiya

Takashi Yokoo

Affiliations

Soon will be listed here.

Abstract

Rationale & Objective: The response to corticosteroid therapy may differ among patients with minimal change disease (MCD). Previous studies have suggested that glomerular hypertrophy or low areal glomerular density in biopsy specimens, which may be related to fewer nephrons, is associated with such a difference. We examined the associations between nephron number and the therapeutic response to corticosteroids in patients with MCD.

Study Design: Retrospective cohort study.

Setting & Participants: 75 adult patients with a histologic diagnosis of MCD.

Exposure: Nephron number per kidney estimated based on the combination of unenhanced computed tomography and nonsclerotic volumetric glomerular density in kidney biopsy specimens.

Outcomes: Complete remission and relapse following corticosteroid therapy.

Analytical Approach: Multivariable Cox proportional hazard analyses of associations between factors, including nephron number, and outcomes.

Results: Mean age of patients was 45.9 years and 60.0% were men. Patients had an estimated glomerular filtration rate of 64.6 mL/min/1.73 m and proteinuria of 8.7 g/d. The estimated total number of nonsclerotic glomeruli ranged from 1.07 to 18.77 ×10 per kidney among all patients. There were no significant differences in total amounts or selectivity of urinary protein excretion at biopsy among the tertile groups categorized by nephron number. All patients responded to corticosteroid therapy, but those with fewer nephrons had a delayed achievement of complete remission. Multivariable Cox proportional hazard analyses identified nephron number as a significant independent explanatory variable for the achievement of complete remission, with a hazard ratio of 1.10 (95% CI, 1.02-1.19)/100,000 nephrons per kidney. Nephron number in these patients was not associated with achievement of partial remission or relapse following complete remission.

Limitation: Retrospective design and sampling bias of needle biopsy.

Conclusions: A small nephron number in patients with MCD is associated with longer time to complete remission.

Citing Articles

Morphometric analysis of chronicity on kidney biopsy: a useful prognostic exercise.

Asghar M, Denic A, Rule A Clin Kidney J. 2024; 17(2):sfad226.

PMID: 38327281 PMC: 10849190. DOI: 10.1093/ckj/sfad226.

Assessment of nephron number and single-nephron glomerular filtration rate in a clinical setting.

Tsuboi N, Sasaki T, Okabayashi Y, Haruhara K, Kanzaki G, Yokoo T Hypertens Res. 2021; 44(6):605-617.

PMID: 33526913 DOI: 10.1038/s41440-020-00612-y.

Nephron Number as Predictor of Corticosteroid Response in Adult Minimal Change Disease.

van den Berge B, Maas R Kidney Med. 2020; 2(5):520-522.

PMID: 33090125 PMC: 7568060. DOI: 10.1016/j.xkme.2020.08.003.

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