eISSN: 1896-9151
ISSN: 1734-1922
Archives of Medical Science
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5/2020
vol. 16
 
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Nephrology
abstract:
Basic research

Over-expression of arginine vasopressin in magnocellular neurosecretory cells of hypothalamus and its potential relationship with development of diabetic nephropathy

Xianhua Li
1
,
Zhaoli Gao
2
,
Ling Xu
2
,
Baoying Li
2
,
Haiqing Gao
2

1.
Department of Nephrology, Qi Lu Hospital of Shandong University, Jinan, China
2.
Department of Geriatrics, Qi Lu Hospital of Shandong University, Jinan, China
Arch Med Sci 2020; 16 (5): 1130–1139
Online publish date: 2020/01/19
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Introduction
We aimed to assess our hypothesis that the expression changes of arginine vasopressin (AVP) in the magnocellular neurosecretory cells (MNCs) of hypothalamus and V2 receptor for AVP (RVP) in kidney may contribute to the pathogenesis of diabetic nephropathy (DN).

Material and methods
Twenty-five male Wistar rats were randomly assigned to the control group and the diabetes mellitus (DM) group. Periodic acid-Schiff (PAS) staining and electron microscopy were used for morphological studies. Immunohistochemical staining for glial fibrillary acidic protein (GFAP) is standard for visualization of reactive astrocytes in the hypothalamus. Hypothalamus was used for immunofluorescence of AVP. Kidney was used for immunohistochemical staining of RVP. Quantitative real-time reverse transcriptase polymerase chain reaction (qRT-PCR) was used for quantitative determinations of AVP mRNA in hypothalamus and RVP mRNA in kidney. Western blot was used to measure the protein expression of AVP in hypothalamus and RVP in kidney.

Results
Morphological studies showed abnormalities in kidney and hypothalamus in the DM group. The number of neurons and the gray value of astrocytes in hypothalamus in the DM group were markedly decreased. The expression level of AVP in hypothalamus and the expression level of RVP in kidney of DM rats were significantly increased. The positive correlations between the proteinuria and expression (mRNA and protein) of AVP, proteinuria and expression (mRNA and protein) of RVP, and the expression of AVP and RVP levels were found.

Conclusions
AVP was upregulated in the MNCs of hypothalamus and RVP was upregulated in kidney in streptozotocin-induced DM rats, indicating their potential roles in the development of DN.

keywords:

diabetic nephropathy, arginine vasopressin, receptor for arginine vasopressin

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