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Mechanisms of star fruit-induced acute renal failure

Hua-Chang Fang1, Po-Tsang Lee, Pei-Jung Lu

  • 1Division of Nephrology, Kaohsiung Veterans General Hospital, Kaohsiung, Taiwan.

Food and Chemical Toxicology : an International Journal Published for the British Industrial Biological Research Association
|February 26, 2008
PubMed

Insights

Star fruit juice causes acute kidney injury by inducing apoptosis in renal cells, not just crystal obstruction. This research clarifies the mechanisms behind star fruit-associated oxalate nephropathy.

Area of Science:

  • Nephrology
  • Toxicology
  • Biochemistry

Background:

  • Star fruit consumption has been linked to acute renal failure.
  • The exact mechanisms of star fruit-induced kidney damage, specifically oxalate nephropathy, require further investigation.

Purpose of the Study:

  • To elucidate the mechanisms by which star fruit juice causes acute renal injury.
  • To differentiate between obstructive and cellular effects of star fruit on the kidneys.

Main Methods:

  • Animal study: Rats were administered star fruit juice or varying concentrations of oxalate solutions.
  • Cellular study: Madin-Darby Canine Kidney (MDCK) cells were treated with star fruit juice and oxalate.
  • Assays: Renal function (creatinine clearance), kidney tissue pathology, and apoptosis (TUNEL assay, flow cytometry) were evaluated.

Main Results:

  • Star fruit juice and oxalate solutions significantly reduced creatinine clearance in rats.
  • Dose-dependent apoptosis was observed in kidney tissues and MDCK cells.
  • Flow cytometry confirmed dose- and time-dependent effects of star fruit juice and oxalate on renal cells.

Conclusions:

  • Star fruit juice induces acute renal injury through both calcium oxalate crystal obstruction and direct induction of renal epithelial cell apoptosis.
  • Oxalate content in star fruit is a key factor contributing to its nephrotoxicity.

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