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The low calorie natural sweetener stevioside: Nephrotoxicity and its relationship to urinary enzyme excretion in the rat
Author(s) -
Toskulkao Chaivat,
Deechakawan Wimon,
Leardkamolkarn Vijittra,
Glinsukon Thirayudh,
Buddhasukh Dhuang
Publication year - 1994
Publication title -
phytotherapy research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.019
H-Index - 129
eISSN - 1099-1573
pISSN - 0951-418X
DOI - 10.1002/ptr.2650080506
Subject(s) - stevioside , nephrotoxicity , endocrinology , medicine , chemistry , convoluted tubule , creatinine , kidney , alkaline phosphatase , blood urea nitrogen , urinary system , biochemistry , biology , enzyme , pathology , alternative medicine
The relationships between urinary enzyme levels and changes in blood urea nitrogen (BUN) and plasma creatinine levels, along with simultaneous ultrastructural changes of the kidney, were studied in rats treated with stevioside. BUN levels increased at 3 h onward after subcutaneous injection (s.c.) with stevioside (1.5 g/kg BW). The maximum increases in BUN and creatinine were approximately 180% and 132% at 9 h after stevioside injection, respectively. At this time, stevioside also caused significant increases in glucosuria, alkaline phosphatase (AP) and γ‐glutamyl transpeptidase (γ‐GTP) but no significant changes in proteinuria, N‐acetyl‐β‐D‐glucuronidase (NAG) or glutathione‐S‐transferase (GSH‐S‐TF). Histopathological examination of the kidney induced by stevioside revealed degeneration of the proximal convoluted tubule cells but no relation to lipid peroxide formation was detected. These results suggest that stevioside induced nephrotoxicity at the proximal convoluted tubules rather than at the glomeruli and other tubules presumably by a defect of cell volume regulation due to depletion of intracellular ATP and disruption of microvilli, and nuclear dysfunction.