Table 3 Endocytic pathways of nanoparticles

From: Microplastics and nanoplastics in the human diet

Type of nanoparticles

Characteristics of nanoparticles

Endocytic pathways

Experimental design

IBD

Ref.

PLGA

397 nm, ligands, cationic, hydrophilic, unspecified

Clathrin-dependent endocytosis + paracellular

In vitro: Caco-2; in vivo (mice)

No

31

PLGA

170–190 nm, negative, spherical

Endocytosis: caveolin + active transport

In vitro: Caco-2; in vivo (mice)

No

32

PLGA

50–200 nm, protein ligands, biodegradable, spherical

Transcytosis

In vitro: C2BBe1 Raji

No

19

PLGA

110–150 nm, positive, with ligands, spherical

Endocytosis: clathrin, caveolin, macropinocytosis

In vitro: Caco-2

No

20

PLGA

141 nm, spherical, negative with ligands

Endocytosis: clathrin, caveolin, macropinocytosis

In vitro: Caco-2

No

30

PLGA

100–200 nm, spherical, hydrophilic with ligands, spherical

Endocytosis: clathrin, caveolin, macropinocytosis

In vitro: Caco-2/HT29-MTX

No

33

PLGA

120 nm, with chitosan, positive, spherical, hydrophilic

Endocytosis

In vitro: Caco-2

No

34

PLGA

237 nm, positive, with ligand, hydrophilic, spherical

NA

In vitro: cell line not specified

No

35

PLGA

140 nm, negative, amphiphilic, spherical

NA

NA

No

36

PEG–PLGA

50–160 nm, lipid, hydrophilic, spherical

Endocytosis: clathrin, caveolin

In vitro: E12, Caco-2, BxPC-3, HPSC

No

37

PEG–PLGA

110 nm, hydrophilic, spherical, biodegradable

Transcytosis/endocytosis

In vitro: Caco-2, J774A

Yes

15

PEG–PLGA

94–136 nm, spherical, weakly negative

Endocytosis

In vitro: Caco-2, macrofagi

No

34,38

PEG–PLGA

158 nm, neutral, biodegradable, spherical

Enterocyte endocytosis; accumulation in inflammatory lesions

In vivo (mice)

Yes

39

PLGA + mPEG–PAE

132 nm, negative, hydrophilic, spherical

Macropinocytosis + endocytosis: caveolin

In vitro: Caco-2; in vivo (mice)

No

32

mPEG–PAE

82–98 nm, negative, hydrophilic, spherical

Macropinocytosis + endocytosis: caveolin

In vitro: Caco-2; in vivo (mice)

No

32

  1. HPSC, human pluripotent stem cell; IBD, inflammatory bowel disease; mPEG–PAE, methoxy-poly(ethylene glycol)–poly(amino ester); NA, not applicable.