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Table 1 The in vitro effects of IONPs

From: Iron oxide nanoparticles may damage to the neural tissue through iron accumulation, oxidative stress, and protein aggregation

Cell type

NP type

Size (nm)

Concentration (μg mL−1)

Coating

Functional group

Explantations

Murine macrophage cell line (J774)

Fe2O3

30

25–500

Tween 80

Hydroxyl

Dose- and time-dependent reduction of viability, cell membrane damage, and induction of apoptosis by ROS [17]

Chick cortical neurons

Fe3O4

10

2655, 5310

Aminosilane

Amine

PEA, compared with others coatings, strongly declined metabolic activity and cell viability and destroyed cell membrane [45].

Dextran

Hydroxyl

PEA

Amine

Porcine aortic endothelial cells

Fe3O4

5 or 30

500

None (Bare)

Hydroxyl

Significant increasing of cell elongation and cell death were seen by bare NPs. Bare 30-NPs incited ROS formation; but coated 30-NPs and bare 5-NPs didn’t induce significant ROS formation. [50].

Dextran

Hydroxyl

PEG

Hydroxyl

Human dermal fibroblast

Fe3O4

10

0–1000

None (Bare)

Hydroxyl

Coating of NPs by TEOS-APTMS and APTMS intensified toxicity and led to a dose-dependent decreased viability, membrane damage, and declined the stability of DNA [46].

100–150

0–1000

SiO2 and TEOS

Hydroxyl

100–150

0–1000

SiO2, TEOS, and APTMS

Amine

10

0–1000

APTMS

Amine

Human fibrosarcoma cells

Fe3O4

10

0–800

None (Bare)

Hydroxyl

Membrane damage and decreased the stability of DNA [46]

Rat pheochromocytoma cells (PC12)

Fe2O3

36

25–200

APTS

Amine

Increased ROS, reduced GSH, and induced apoptosis [55]

Human breast cancer cell line (MCF-7)

Fe3O4

11

50–200

None (Bare)

Hydroxyl

Dose-dependent reduction of viability [66]

Human neuroblastoma cell line (SH-SY5Y)

Fe2O3

10

2.5–10

None (Bare)

Hydroxyl

Decreased dopamine levels, induction of oxidative stress, and reducing of cell proliferation [39]

30

2.5–10

Oleic acid and PEG

Carboxyl

Rat brain microvessel endothelial cells

Fe2O3

10

1, 10, and100

None (bare)

Hydroxyl

Significant increase in ROS level by 10 nm-NPs. Damage to the membrane by both NPs [39].

30

1–100

Oleic acid and PEG

Carboxyl

Human hepatocyte carcinoma cell line (Hep G-2)

Hollow sphere Fe2O3

200

25–200

Carbon particles

Hydroxyl and carbonyl

Dose-dependent diminished viability [56]

Mouse Fibroblastic Cell Line (L929)

Fe3O4

20

100

None (bare)

Hydroxyl

Decreased toxicity of H2O2 [40]

Rat pheochromocytoma cells (PC12)

Fe3O4

20

100

None (bare)

Hydroxyl

Decreased toxicity of MPP+ [40]

Human Ovarian Cancer Cell Line (Skov-3)

Fe3O4

9.2

120–240

PEG, PEI and Folic acid

Carboxyl and hydroxyl

Non-tixic [52]

Human blood cells

Fe3O4

<20

10–1000

Oleylamine

Amine

Increased oxidative stress, dose-dependent DNA damage [67]

Mouse embryonic fibroblasts (NIH3T3)

Fe3O4

15–20

0.032 and 0.065

Oleate

Carboxyl

Dose and time dependent reduced viability [51]

Mouse embryonic neural stem cells

Fe2O3

100a

20–200

bare

Hydroxyl

Severe diminished GSH, declined ROS, increased mitochondrial potential, long-term depolarization of cell membrane, and DNA damage [58]

100a

20–200

d-mannose

Hydroxyl

100–150a

20–200

poly-l-lysine

Amine

  1. The studies indicate Fe3+ is more toxic than Fe2+. Amine functional group often increases cytotoxicity. The toxicity of NPs is further dose- and time-dependent
  2. APTMS aminopropyltrimethoxysilane, APTS aminopropyltriethoxysilane, PEA poly-(dimethylamine-coepichlorhydrin-co-ethylendiamine), PEG polyethylene glycol, PEI polyethylenimine, TEOS Tetraethylorthosilicate
  3. aAggregate diameter