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2017 ; 5
(13
): ä Nephropedia Template TP
gab.com Text
Twit Text FOAVip
Twit Text #
English Wikipedia
Diabetic rats present higher urinary loss of proteins and lower renal expression
of megalin, cubilin, ClC-5, and CFTR
#MMPMID28676554
Figueira MF
; Castiglione RC
; de Lemos Barbosa CM
; Ornellas FM
; da Silva Feltran G
; Morales MM
; da Fonseca RN
; de Souza-Menezes J
Physiol Rep
2017[Jul]; 5
(13
): ä PMID28676554
show ga
Diabetic nephropathy (DN) occurs in around 40% of those with diabetes.
Proteinuria is the main characteristic of DN and develops as a result of
increased permeability of the glomerulus capillary wall and/or decreased proximal
tubule endocytosis. The goal of this work was to evaluate renal function and the
expression of megalin, cubilin, CFTR (cystic fibrosis transmembrane conductance
regulator), and ClC-5 in the proximal tubule and renal cortex of rats with type 1
diabetes. Male Wistar rats were randomly assigned to control (CTRL) and diabetic
(DM) groups for 4 weeks. Renal function was assessed in 24-h urine sample by
calculating clearance and fractional excretion of solutes. The RNA and protein
contents of ClC-5, CFTR, megalin, and cubilin were determined in the renal
proximal tubule and cortex using real-time polymerase chain reaction and western
blotting techniques, respectively. The results showed higher creatinine clearance
and higher urinary excretion of proteins, albumin, and transferrin in the DM
group than in the CTRL group. Furthermore, the renal cortex and proximal tubule
of diabetic animals showed downregulation of megalin, cubilin, ClC-5, and CFTR,
critical components of the endocytic apparatus. These data suggest dysfunction in
proximal tubule low-molecular-weight endocytosis and protein glomerulus
filtration in the kidney of diabetic rats.