Systemic aluminum toxicity: effects on bone, hematopoietic tissue, and kidney

Area of Science:

• Toxicology
• Bone Biology
• Hematology
• Nephrology

Background:

• Aluminum (Al) toxicity mechanisms on bone and hematopoietic tissues are under investigation.
• Limited information exists regarding the interactive effects of systemic aluminum and kidney function.
• Existing research suggests high aluminum doses impair bone remodeling and cause anemia.

Purpose of the Study:

• To review current knowledge on aluminum toxicity in bone, hematopoietic tissue, and the kidney.
• To identify gaps in understanding aluminum's effects on bone remodeling, osteoblast/osteoclast activity, and parathyroid hormone (PTH) levels.
• To explore aluminum's impact on iron metabolism and its role in anemia, and to highlight the need for research on renal aluminum toxicity and excretion.

Main Methods:

• Literature review of existing studies on aluminum toxicity.
• Analysis of experimental and clinical data on aluminum's effects on bone and blood.
• Identification of research gaps concerning kidney function and aluminum accumulation.

Main Results:

• High aluminum doses inhibit bone remodeling, leading to osteomalacia and adynamic bone disease.
• Aluminum causes microcytic anemia, potentially through disrupted iron metabolism.
• Parathyroid hormone (PTH) levels are altered by aluminum, but its role in osteotoxicity is unclear.
• Significant gaps exist in understanding aluminum nephrotoxicity and renal excretion mechanisms.

Conclusions:

• No single mechanism explains the diverse toxic effects of systemic aluminum.
• Further research is crucial to elucidate aluminum's impact on bone, hematopoiesis, and kidney function.
• Understanding aluminum's renal handling is vital to determine its role in renal insufficiency and overall toxicity.