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Arthritis Res Ther. 2017 Jun 2;19(1):120. doi: 10.1186/s13075-017-1317-x.

Ectopic germinal center and megalin defect in primary Sjogren syndrome with renal Fanconi syndrome.

Author information

1
Nephrology Department, Chinese Academy of Medical Science, Peking Union Medical College Hospital, Tsing Hua University, Beijing, China.
2
Nephrology Department, Chinese Academy of Medical Science, Peking Union Medical College Hospital, Tsing Hua University, Beijing, China. yuyang@medmail.com.cn.
3
Department of Nephrology, Chinese Academy of Medical Science, Peking Union Medical College Hospital, No 1, Shuaifuyan, Wangfujing St, Beijing, 100730, China. yuyang@medmail.com.cn.
4
Division of Nephrology, Massachussetts General Hospital, Boston, MA, USA.
5
Nephrology Department, Chinese Academy of Medical Science, Peking Union Medical College Hospital, Tsing Hua University, Beijing, China. chenlimeng@pumch.cn.

Abstract

BACKGROUND:

This study reports the clinical and pathological features of 12 cases of primary Sjogren syndrome (pSS) with renal involvement presenting with proximal tubular dysfunction in a single center, and investigates the possible correlation of ectopic germinal center formation and megalin/cubilin down-expression.

METHOD:

Clinical and pathological records were reviewed. Immunohistochemistry was carried out to detect megalin, cubilin, CD21 and IL-17 expression.

RESULTS:

Patients presented with different degrees of proximal renal tubule lesion and decreased estimated glomerular filtration rate (eGFR). Renal biopsy revealed tubulointerstitial nephritis, with tubular epithelial cell degeneration, tubular atrophy, interstitial inflammation and focal fibrosis. Immunohistochemistry revealed decreased expression of megalin and cubilin, two important multiligand protein receptors on the brush border of proximal tubular epithelial cells. IL-17 secreted by Th17 subtype effector T cells was diffusely detected in the renal proximal tubule, with a negative correlation of IL-17 and megalin expression. In addition, ectopic germinal centers characterized by CD21+ follicular dendritic cells were present in the renal interstitium. In patients with a decreased eGFR, treatment with 4 weeks of glucocorticoid therapy resulted in an improved eGFR in 75% of patients.

CONCLUSION:

We report 12 cases of pSS characterized by Fanconi syndrome. The decreased megalin and cubilin expression may contribute to the proximal tubular reabsorption defect, possibly secondary to Th17 infiltration and formation of ectopic germinal centers.

KEYWORDS:

Cubilin; Ectopic germinal center; IL-17; Megalin; Primary Sjogren syndrome

PMID:
28577559
PMCID:
PMC5455124
DOI:
10.1186/s13075-017-1317-x
[Indexed for MEDLINE]
Free PMC Article

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