Mechanisms of Chemical Toxicity and Cellular Injury
The mechanism of toxicology refers to the biological and biochemical processes by which a toxic substance (toxicant) causes harmful effects in the body.
The mechanism generally involves the following
steps:
- Exposure - The toxicant enters the body through:
Ø Inhalation (lungs)
Ø Ingestion (mouth)
Ø Skin absorption
Ø Injection
- Absorption - The toxicant passes into
the bloodstream from the site of exposure.
- Distribution - The bloodstream
transports the toxicant to different organs and tissues such as the liver,
kidneys, brain, or lungs.
- Metabolism
(Biotransformation) - The liver converts the toxicant into
metabolites. This may:
Ø
Detoxify
the substance (make it less harmful), or
Ø
Bioactivate
it into a more toxic form.
- Interaction
with Target Cells - The toxicant or its metabolites interact
with cellular components, causing:
Ø
Enzyme
inhibition
Ø
DNA
damage (mutations)
Ø
Oxidative
stress (production of free radicals)
Ø
Membrane
damage
Ø
Protein
dysfunction
Ø
Disruption
of normal cell signaling
- Cellular
Injury and Organ Damage - These interactions can lead to:
Ø
Cell
death (necrosis or apoptosis)
Ø
Inflammation
Ø
Organ
dysfunction (e.g., liver failure, kidney damage, neurotoxicity)
- Excretion - The body eliminates the
toxicant through:
Ø
Urine
(kidneys)
Ø
Feces
(bile/intestines)
Ø
Exhaled
air (lungs)
Ø
Sweat or
breast milk (to a lesser extent)
Key mechanisms of toxicity
Ø
Oxidative stress: Excess free radicals damage cells.
Ø
Enzyme inhibition: Toxicants block essential enzymes (e.g., organophosphate pesticides
inhibit acetylcholinesterase).
Ø
DNA damage: Can lead
to mutations and cancer.
Ø
Membrane disruption: Causes leakage of cell contents and cell death.
Ø
Immune-mediated toxicity: Toxicants trigger harmful immune responses.
This sequence explains how toxic substances produce
adverse effects in living organisms.
END OF THE DOCUMENT
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