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Lead exposure causes thyroid abnormalities in diabetic rats.

Salah Al Zadjali1, Abderrahim Nemmar2, Mohamed Abdelmonem Ay Fahim2

  • 1Department of Pharmacology and Therapeutics, UAE University Al-Ain, UAE.

International Journal of Clinical and Experimental Medicine
|July 30, 2015
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Lead exposure in diabetic rats caused weight loss, hypothyroidism, and kidney damage. Glutathione depletion indicates significant oxidative stress, highlighting the risks of lead contamination in diabetic conditions.

Keywords:
Leaddiabetesratsystemic toxicitythyroid

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Area of Science:

  • Environmental toxicology
  • Endocrinology
  • Diabetology

Background:

  • Lead is a pervasive environmental pollutant with known adverse health effects.
  • The impact of lead exposure on diabetic animal models remains largely uninvestigated.
  • Understanding these interactions is crucial for public health, especially for diabetic populations.

Purpose of the Study:

  • To investigate the effects of lead acetate exposure on thyroid function, renal parameters, and oxidative stress markers in streptozotocin-induced diabetic Wistar rats.
  • To establish a dose-response relationship between lead acetate administration and its physiological consequences in diabetic rats.

Main Methods:

  • Diabetes was induced in Wistar rats using streptozotocin (STZ).
  • Diabetic rats were administered varying doses of lead acetate (25, 50, 100 mg/kg) or distilled water (control) intraperitoneally.
  • Blood samples were analyzed for lead levels, thyroid hormones (TSH, T4, T3), renal markers (urea, creatinine), and oxidative stress indicators (malondialdehyde, glutathione).

Main Results:

  • Lead acetate levels in blood showed a positive correlation with administered doses.
  • Lead exposure led to significant weight loss, elevated thyroid-stimulating hormone (TSH), and reduced thyroxine (T4) and triiodothyronine (T3) levels, indicative of hypothyroidism.
  • Renal function was impaired, evidenced by increased urea and decreased creatinine levels.
  • Glutathione stores were significantly depleted, suggesting oxidative stress, while malondialdehyde levels remained unchanged.

Conclusions:

  • Lead acetate exposure in diabetic rats induces significant weight loss, clinical hypothyroidism, and renal damage.
  • The observed depletion of glutathione indicates that lead exposure exacerbates oxidative stress in diabetic conditions.
  • These findings underscore the potential health risks associated with lead contamination in diabetic individuals.