Research Digest

Lab notes: Kidney disease may be linked to pesticide exposure

A new study analysed blood samples of patients with chronic kidney disease and found high levels of at least three pesticides.

Patients with chronic kidney disease have higher amounts of organochlorine pesticides in their body, a new study has indicated.

Doctors at the University College of Medical Sciences and Guru Teg Bahadur Hospital in Delhi studied 300 individuals aged 30-54 years, who visited kidney clinics between January 2014 and March 2015. Their blood samples were tested for presence of a range of organochlorine pesticides – alpha and beta endosulphan, DDT and DDE, dieldrin, Aldrin, and alpha, beta, and gamma HCH.

“We found that chronic kidney disease patients had higher levels of three pesticides, beta-endosuplhan, aldrin, and alpha-HCH in their blood as compared to healthy people”, said Ashok Kumar Tripathi, who led the research. This, he said, suggested a possible involvement of pesticides with abnormal kidney function.

It was found that the median levels of alpha-HCH, beta-endosulphan, and aldrin in healthy subjects were 0.7, 1.38, and 1.6 parts per billion respectively. In patients of chronic kidney disease, these levels were significantly higher – 1.68, 2.38, and 2.15 parts per billion respectively. The results were published recently in journal Environmental Health and Preventive Medicine.

Although the mechanism of how pesticides affect kidney health is yet to be elucidated, researchers believe that accumulated amounts of pesticides may induce oxidative stress in the kidneys, which leads to chronic kidney disease. In order to confirm the link, follow up studies with a larger group of people are required, said Tripathi.

Still, the study is significant because it finds high levels of pesticides in people living in an urban area like Delhi, who are not directly involved in agricultural activity or manufacture of pesticides and who probably got exposed through environmental contamination, pointed out Catharina Wesseling, toxicologist at the Central American Institute for Studies on Toxic Substances, Universidad Nacional in Costa Rica. She was not involved in the Delhi study.

Wesseling told India Science Wire that, “While this study does not establish that pesticides cause kidney disease, it is known that many pesticides are toxic for the kidneys. One can expect to find associations between (some) pesticides and kidney dysfunction”.

Organochlorine pesticides such as DDT and endosulfan are banned in many countries owing to their long persistence in the environment and adverse impacts on human health. Previous studies from El Salvador, Central America, Mexico, and Sri Lanka have indicated their possible involvement in development of chronic kidney disease.The disease affects nearly 17% of the Indian population and is expected to rise with increasing cases of hypertension and diabetes.

The research team included Rishila Ghosh, Manushi Siddarth, Neeru Singh, Vipin Tyagi, Pawan Kumar Kare, Basu Dev Banerjee, Om Prakash Kalra, and Ashok Kumar Tripathi. This study was funded by the Department of Science and Technology.

This article was first published by India Science Wire.

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