Mesoamerican Nephropathy or Global Warming Nephropathy?

Area of Science:

• Nephrology
• Environmental Health
• Epidemiology

Background:

• An epidemic of chronic kidney disease (CKD) of unknown etiology affects agricultural workers, particularly sugarcane laborers, along the Pacific Coast of Central America.
• The disease progresses insidiously with elevated serum creatinine, ultimately leading to end-stage renal disease and characterized by chronic tubulointerstitial damage on biopsy.
• Recent evidence suggests recurrent dehydration in hot climates as a primary driver, potentially exacerbated by global warming.

Purpose of the Study:

• To investigate the potential causes and mechanisms of the CKD epidemic in Mesoamerica.
• To explore the link between occupational exposures, climate change, and renal pathology.

Main Methods:

• Review of existing epidemiological data and clinical case studies.
• Analysis of proposed pathophysiological mechanisms, including hyperosmolarity and uricosuria.
• Correlation of disease incidence with environmental factors and working conditions.

Main Results:

• The epidemic has resulted in over 20,000 deaths, predominantly among male manual laborers.
• Recurrent dehydration is implicated, with potential injury mechanisms involving hyperosmolarity and aldose reductase activation.
• Repeated episodes of uricosuria and urate crystal formation may also contribute to renal damage.

Conclusions:

• The Mesoamerican CKD epidemic is strongly linked to chronic recurrent dehydration, exacerbated by occupational heat exposure and potentially global warming.
• This condition may represent one of the first major human diseases causally attributed to climate change.
• Urgent public health interventions and further research are needed to address this growing crisis.