Health Risks and Regulation of Nanoparticles

This set of flashcards covers key concepts, facts, and health-related information concerning nanoparticles and their impact on human health.

What are some detrimental effects of nanoparticles on human health?

Chronic inflammation, lung damage, tissue inflammation, altered cellular balance.

What properties can contribute to the potential toxicity of nanoparticles?

Size, shape, chemistry, agglomeration state, and electromagnetic properties.

How can nanoparticles be used in drug delivery?

Nanoparticles can be engineered to enhance drug uptake and targeted delivery.

What was the predominant use of asbestos?

In the building and construction industries for its fire retardant and insulation properties.

When was asbestos completely banned in Ireland?

In 2004.

What lung disease was first described in relation to asbestos exposure?

Asbestosis.

How long is the typical latency period for lung cancer after asbestos exposure?

20 to 50 years.

What are E-cigarettes known to produce?

Nanoparticles that deposit in the lungs.

What unknown factors influence the health risks of E-cigarettes?

The chemical composition and size of the combustion products.

What is a common hallmark reaction to nanoparticle exposure?

Chronic inflammation.

Why is size important in the FDA approval of materials?

Novel properties emerge at the nanoscale that can affect toxicity.

What does the surface-to-volume ratio imply for nanoparticles?

Nanoparticles interact more strongly with biological molecules due to their larger surface area.

What immune response can nanoparticle hydrophobicity elicit?

Stronger induction of an immune response.

What effect do amorphous silicon nanoparticles have on macrophages?

Adverse changes in transcriptional activity and pro-inflammatory signaling.

What happens to nanoparticles in contact with body fluids?

Proteins adsorb to them, potentially evoking cell responses.

What is the 'nanoparticle corona'?

A layer of proteins that makes it hard to assess nanoparticle toxicity.

How do regulations categorize nanoparticles?

By their physical characteristics and potential formulations.

What was the finding about titanium dioxide in food products by EFSA?

Considering it no longer safe when used as a food additive.

What is nanomedicine?

The science and technology of using molecular tools to diagnose, treat, and prevent diseases.

Name three medical applications of nanoparticles.

Drug delivery, therapy, and diagnostic imaging.

What characterizes passive drug targeting with nanoparticles?

Accumulation in target tissue based on enhanced permeation and retention effect.

What is active drug targeting?

Specific recognition and uptake by malignant cells using surface ligands on nanoparticles.

What should studies on nanomaterial toxicity improve?

The reliability of evaluating health risks associated with nanoparticles.

What kind of approach is necessary for assessing nanoparticle toxicity?

A rational science-based approach.

How has particulate pollution changed due to technological advancements?

Increased proportion of nanoparticles with diverse chemical compositions.

Why can nanoparticles penetrate biological tissues?

Their minute size, smaller than cells and organelles.

What negative effect can nanoparticle exposure have on cellular function?

Disrupt normal functions and potentially cause cell death.

What effect does exposure to nanoparticles have on macrophages?

Increased difficulty in particle clearance compared to larger particles.

Why is ongoing study of 'nanotoxicity' necessary?

Current knowledge may not predict the toxicity of nanoparticles.

What is the relationship between particulate air pollution and health?

Strong correlation with respiratory and cardiovascular diseases, various cancers.

What substance resulted in a change of labeling guidelines for products?

Nanomaterials, requiring 'nano' to be specified.

What do nanoparticles' unique properties allow them to do?

Interfere with biological functions and enhance drug delivery efficiency.

How are nanoparticles utilized in medical imaging?

As contrast agents to enhance visibility in diagnostic procedures.

What are the effects of nanoparticle formulation on toxicity?

Different formulations and environmental conditions can alter toxicity.

What did the 2016 EFSA report conclude about titanium dioxide?

It is no longer considered safe as a food additive.

Which nanomaterials are considered for drug delivery?

Self-assembled nanoparticles from amphiphilic building blocks.

What do nanoparticles' enhanced properties at the nanoscale include?

Increased electrical conductivity, better catalytic efficiency, altered optical features.

How do some nanoparticles affect the blood-brain barrier?

Increased permeability enhancing drug transport to the brain.

What is indicated by the term ‘EPR effect’ in drug delivery?

Enhanced permeation and retention of nanoparticles in tumor tissues.

What kind of guidelines are necessary for nanoparticles?

Standardization of definitions and labelling for consumer safety.

What illness was linked to the introduction of diverse new nanomaterials?

Potential new health risks and diseases such as Parkinson's and Alzheimer's.

What role does the human body's system play against nanoparticle exposure?

It actively neutralizes and eliminates foreign matter, including nanoparticles.

Why is understanding nanoparticle exposure crucial for health risk assessment?

It helps identify pathways to reduce exposure and associated health risks.