Renal tubular P-glycoprotein expression is reduced in plasma cell disorders
Kidney Research and Clinical Practice
; : 186-195, 2019.
Article
ي En
| WPRIM
| ID: wpr-758991
المكتبة المسؤولة:
WPRO
ABSTRACT
BACKGROUND: P-glycoprotein (P-gp) transports many chemicals that vary greatly in their structure and function. It is normally expressed in renal proximal tubular cells. We hypothesized that P-gp expression influences light chain excretion. Therefore, we investigated whether renal tubular P-gp expression is altered in patients with plasma cell disorders. METHODS: We evaluated renal biopsy specimens from patients with plasma cell disorders (n = 16) and primary focal segmental glomerulosclerosis (the control group, n = 17). Biopsies were stained with an anti-P-gp antibody. Loss of P-gp expression was determined semi-quantitatively. Groups were compared for loss of P-gp expression, and clinical variables. RESULTS: P-gp expression loss was more severe in patients with plasma cell disorders than it was in those with glomerulonephritis (P = 0.021). In contrast, clinical and histological parameters including serum creatinine, level of urinary protein excretion, and interstitial fibrosis/tubular atrophy grade were not significantly different between the groups. P-gp expression loss increased with age in patients with plasma cell disorders (P = 0.071). This expression loss was not associated with serum creatinine, the level of urinary protein excretion or the interstitial fibrosis/tubular atrophy grade. There was no significant association between the severity of P-gp expression loss with the types and serum levels of light chains, isotypes and serum immunoglobulin levels. CONCLUSION: Renal tubular P-gp expression is significantly down-regulated in patients with plasma cell disorders characterized by nephrotic range proteinuria. Additional studies are needed to determine whether reintroduction of renal tubular P-gp expression would mitigate the proximal tubular injury that is caused by free-light chains.
Key words
النص الكامل:
1
الفهرس:
WPRIM
الموضوع الرئيسي:
Plasma
/
Plasma Cells
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Proteinuria
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Atrophy
/
Biopsy
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Immunoglobulins
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Glomerulosclerosis, Focal Segmental
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Immunoglobulin Light Chains
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ATP Binding Cassette Transporter, Subfamily B, Member 1
/
Creatinine
المحددات:
Humans
اللغة:
En
مجلة:
Kidney Research and Clinical Practice
السنة:
2019
نوع:
Article