Gadolinium (Gd)-based contrast agents are extensively used for magnetic resonance imaging (MRi). Liposomes are potential nanocarrier-based biocompatible platforms for development of new generations of MRi diagnostics. Liposomes with Gd-complexes (Gd-lip) co-encapsulated with thrombolytic agents can serve both for imaging and treatment of various pathological states including stroke. in this study, we evaluated nanosafety of Gd-lip containing pe-DtpA chelating Gd +3 prepared by lipid film hydration method. We detected no cytotoxicity of Gd-lip in human liver cells including cancer HepG2, progenitor (non-differentiated) HepaRG, and differentiated HepaRG cells. Furthermore, no potential side effects of Gd-lip were found using a complex system including general biomarkers of toxicity, such as induction of early response genes, oxidative, heat shock and endoplasmic reticulum stress, DnA damage responses, induction of xenobiotic metabolizing enzymes, and changes in sphingolipid metabolism in differentiated HepaRG. Moreover, Gd-lip did not show pro-inflammatory effects, as assessed in an assay based on activation of inflammasome NLRP3 in a model of human macrophages, and release of eicosanoids from HepaRG cells. in conclusion, this in vitro study indicates potential in vivo safety of Gd-lip with respect to hepatotoxicity and immunopathology caused by inflammation.Gadolinium (Gd) -based contrast agents are extensively used for magnetic resonance imaging (MRI). Gd +3 forms insoluble phosphate salt in biological fluids and cultivation media. Therefore, Gd +3 is used in complexed forms of soluble chelates. These complexes are believed to be stable and non-toxic because of a high stability constant 1 . Recently, accumulation of Gd-based contrast agents has been demonstrated in various organs like kidney, liver and nervous system. It is supposed that toxic effects can be caused by dissociation of Gd ions from chelated complexes 2,3 . Case reports pointed to the induction of nephrotoxicity, hepatotoxicity and neurotoxicity and rare acute adverse reactions to Gd-based contrast agents were also observed in patients 4 .Liposomes, phospholipid-based vesicles, are widely studied as potential nanocarriers of both MRI contrast agents, including Gd +3 , and drug molecules, such as thrombolytic agents 1,5 . Therefore, liposomes can serve as diagnostic as well as theranostic agents for imaging and treatment of various pathological states and illnesses such as cancer, ischemic stroke and vasculature of different organs including liver and spleen 6,7 . Thus, liposomes represent a favourable platform for a new generation of targeted diagnostic and theranostic systems 8 .Liposomes composed of a Gd-chelating lipid, such as 1,2-distearoyl-sn-glycero-3-p hosphoethanolamine-N-diethylenetriaminepentaacetic acid (PE-DTPA (Gd)), can be easily modified to capture targeting moieties on their surface using different chemistries including copper-free click-chemistry. Moreover, different surface coating of liposomes including polyethylene glycol, hyalu...