Abstract
Molecular and diagnostic imaging has been recently a subject of intense research in the treatment of numerous diseases. In medical imaging, there are different modalities with unique strengths including MRI, ultrasound imaging, computed tomography, positron emission tomography and single photon emission computed tomography. These systems need specific contrast agents to achieve a suitable image with the best quality. Nanoparticles represent an innovative tool in imaging field research and diagnostics of various diseases, especially cancerous ones. Among the nanocarriers, lipid-based nanoparticles, such as nanostructured lipid carriers, solid lipid nanoparticles and liposomes, are the most used carriers in imaging because of having many advantageous properties. This review addresses advancements in different lipid-based nanoparticles as tools in medical diagnostic and imaging.

Papers of special note have been highlighted as: • of interest; •• of considerable interest
References
- 1 . The impact of variables on particle size of solid lipid nanoparticles and nanostructured lipid carriers; a comparative literature review. Adv. Pharm. Bull. 6(2), 143–151 (2016).Crossref, Medline, Google Scholar
- 2 . Radiolabeled nanoparticles for multimodality tumor imaging. Theranostics 4(3), 290–306 (2014).Crossref, Medline, Google Scholar
- 3 . Nanoparticle-based theranostic agents. Adv. Drug Deliv. Rev. 62(11), 1064–1079 (2010).Crossref, Medline, CAS, Google Scholar
- 4 . Multifunctional and stimuli-sensitive pharmaceutical nanocarriers. Eur. J. Pharm. Biopharm. 71(3), 431–444 (2009).Crossref, Medline, CAS, Google Scholar
- 5 . Biomedical nanomaterials for imaging-guided cancer therapy. Nanoscale 4(20), 6135 (2012).Crossref, Medline, CAS, Google Scholar
- 6 Adjusting the balance between effective loading and vector migration of macrophage vehicles to deliver nanoparticles. PLoS ONE 8(10), e76024 (2013).Crossref, Medline, CAS, Google Scholar
- 7 Non-invasive optical imaging of cathepsin B with activatable fluorogenic nanoprobes in various metastatic models. Biomaterials 35(7), 2302–2311 (2014).Crossref, Medline, CAS, Google Scholar
- 8 . Molecular imaging in drug development. Nat. Rev. Drug Discov. 7(7), 591–607 (2008).Crossref, Medline, CAS, Google Scholar
- 9 Theranostic nanoparticles for future personalized medicine. J. Control. Release 190, 477–484 (2014).Crossref, Medline, CAS, Google Scholar
- 10 . Theranostic nanoparticles for cancer and cardiovascular applications. Pharm. Res. 31(6), 1390–1406 (2014).Crossref, Medline, CAS, Google Scholar
- 11 . Size-controlled synthesis of dextran sulfate coated iron oxide nanoparticles for magnetic resonance imaging. Nanotechnology 18(3), 035603 (2007).Crossref, Medline, Google Scholar
- 12 . Chitosan-coated ferrite (Fe3O4) nanoparticles as a T2 contrast agent for magnetic resonance imaging. J. Korean Phys. Soc. 56(3), 868–873 (2010).Crossref, Google Scholar
- 13 Synthesis of Gd2O3 nanoparticles for MRI contrast agents. Journal of Physics: Conference Series. IOP Publishing, 352(1), 12008 (2012).
doi:10.1088/1742-6596/352/1/012008 Crossref, Google Scholar - 14 . Nanoparticle contrast agents for computed tomography: a focus on micelles. Contrast Media Mol. Imaging 9(1), 37–52 (2014).Crossref, Medline, CAS, Google Scholar
- 15 Lipid nanoparticle vectorization of indocyanine green improves fluorescence imaging for tumor diagnosis and lymph node resection. J. Biomed. Nanotechnol. 8(5), 730–741 (2012).Crossref, Medline, CAS, Google Scholar
- 16 . The upcoming field of theranostic nanomedicine: an overview. J. Biomed. Nanotechnol. 8(6), 859–882 (2012).Crossref, Medline, CAS, Google Scholar
- 17 Tumor targeting of functionalized lipid nanoparticles: assessment by in vivo fluorescence imaging. Eur. J. Pharm. Biopharm. 75(2), 137–147 (2010).Crossref, Medline, CAS, Google Scholar
- 18 Nanonosači na bazi čvrstih lipida: pregled. Acta Pharm. 62(4), 433–472 (2012).Crossref, Medline, CAS, Google Scholar
- 19 Paramagnetic solid lipid nanoparticles as a novel platform for the development of molecular MRI probes. Chem. Eur. J. 19(34), 11189–11193 (2013).Crossref, Medline, CAS, Google Scholar
- 20 . Solid lipid nanoparticles: production, characterization and applications. Adv. Drug Deliv. Rev. 47(2), 165–196 (2001).Crossref, Medline, CAS, Google Scholar
- 21 . Lipid nanoparticles (SLN, NLC) in cosmetic and pharmaceutical dermal products. Int. J. Pharm. 366(1–2), 170–184 (2009).Crossref, Medline, CAS, Google Scholar
- 22 . Applications of nanotechnology in cancer: a literature review of imaging and treatment. J. Nucl. Med. Radiat. Ther. 5(4), 4–12 (2014).Crossref, Google Scholar
- 23 . In vitro and in vivo study of solid lipid nanoparticles loaded with superparamagnetic iron oxide. J. Drug Target. 11(1), 19–24 (2003).Crossref, Medline, CAS, Google Scholar
- 24 . Novel method to label solid lipid nanoparticles with 64 Cu for positron emission tomography imaging. Bioconjug. Chem. 22(4), 808–818 (2011).Crossref, Medline, CAS, Google Scholar
- 25 . A novel solid lipid nanoparticle formulation for active targeting to tumor αvβ3 integrin receptors reveals cyclic RGD as a double-edged sword. Adv. Healthc. Mater. 1(5), 600–608 (2012).Crossref, Medline, CAS, Google Scholar
- 26 . Optically traceable solid lipid nanoparticles loaded with siRNA and paclitaxel for synergistic chemotherapy with in situ imaging. Adv. Healthc. Mater. 2(4), 576–584 (2013).Crossref, Medline, CAS, Google Scholar
- 27 . Recent trends in the use of lipidic nanoparticles as pharmaceutical carriers for cancer therapy and diagnostics. J. Mater. Chem. B 1(39), 5201–5209 (2013).Crossref, Medline, CAS, Google Scholar
- 28 . Quantum dots for in vivo small-animal imaging. J. Nucl. Med. 50(4), 493–496 (2009).Crossref, Medline, CAS, Google Scholar
- 29 . NMR relaxometric investigations of solid lipid nanoparticles (SLN) containing gadolinium (III) complexes. Eur. J. Pharm. Biopharm. 45(2), 157–163 (1998).Crossref, Medline, CAS, Google Scholar
- 30 Solid lipid nanoparticles for image-guided therapy of atherosclerosis. Bioconjug. Chem. 27(3), 569–575 (2016). •• A review on newly published literatures regarding the application of solid lipid nanoparticles in imaging.Crossref, Medline, CAS, Google Scholar
- 31 . Intravenous administration to rabbits of non-stealth and stealth doxorubicin-loaded solid lipid nanoparticles at increasing concentrations of stealth agent: pharmacokinetics and distribution of doxorubicin in brain and other tissues. J. Drug Target. 10(4), 327–335 (2002).Crossref, Medline, CAS, Google Scholar
- 32 . Challenges and solutions for the delivery of biotech drugs–a review of drug nanocrystal technology and lipid nanoparticles. J. Biotechnol. 113(1), 151–170 (2004).Crossref, Medline, CAS, Google Scholar
- 33 . Solid lipid nanoparticles: a potential multifunctional approach towards rheumatoid arthritis theranostics. Molecules 20(12), 11103–11118 (2015).Crossref, Medline, CAS, Google Scholar
- 34 . Nanostructured lipid matrices for improved microencapsulation of drugs. Int. J. Pharm. 242(1), 121–128 (2002).Crossref, Medline, Google Scholar
- 35 . Formulation of a novel oxybenzone-loaded nanostructured lipid carriers (NLCs). AAPS PharmSciTech 11(4), 1684–1694 (2010).Crossref, Medline, CAS, Google Scholar
- 36 . Engineering of a nanostructured lipid carrier for the poorly water-soluble drug, bicalutamide: physicochemical investigations. Colloids Surfaces A Physicochem. Eng. Asp. 416, 32–42 (2013).Crossref, Google Scholar
- 37 . Reversal activity of nanostructured lipid carriers loading cytotoxic drug in multi-drug resistant cancer cells. Int. J. Pharm. 361(1), 239–244 (2008).Crossref, Medline, CAS, Google Scholar
- 38 . Lipid-based colloidal carriers for peptide and protein delivery-liposomes versus lipid nanoparticles. Int. J. Nanomedicine 2(4), 595 (2007).Medline, CAS, Google Scholar
- 39 Lipid-based nanoparticles as pharmaceutical drug carriers: from concepts to clinic. Crit. Rev. Ther. Drug Carr. Syst. 26(6), 523–589 (2009).Crossref, Medline, CAS, Google Scholar
- 40 Zerumbone-loaded nanostructured lipid carriers: preparation, characterization, and antileukemic effect. Int. J. Nanomedicine 8, 2769 (2013).Crossref, Medline, Google Scholar
- 41 . Miconazole-loaded nanostructured lipid carriers (NLC) for local delivery to the oral mucosa: improving antifungal activity. Colloids Surf. B Biointerfaces 111, 755–763 (2013).Crossref, Medline, CAS, Google Scholar
- 42 . Lipid nanoparticles as vehicles for topical psoralen delivery: solid lipid nanoparticles (SLN) versus nanostructured lipid carriers (NLC). Eur. J. Pharm. Biopharm. 70(2), 633–640 (2008).Crossref, Medline, CAS, Google Scholar
- 43 . Tumour targeting: biological factors and formulation advances in injectable lipid nanoparticles. J. Pharm. Pharmacol. 57(4), 411–421 (2005).Crossref, Medline, CAS, Google Scholar
- 44 . Nanopharmaceuticals: innovative theranostics for the neurological disorders. Biomed. Rev. 25, 25 (2014).Crossref, CAS, Google Scholar
- 45 . Chitosan coated nanostructured lipid carriers for brain delivery of proteins by intranasal administration. Colloids Surf. B Biointerfaces 134, 304–313 (2015).Crossref, Medline, CAS, Google Scholar
- 46 . Methods and compositions for imaging. US20130045161A1 (2012).Google Scholar
- 47 . Formulation design and evaluation of quantum dot-loaded nanostructured lipid carriers for integrating bioimaging and anticancer therapy. Nanomedicine 8(8), 1253–1269 (2013).Crossref, Medline, CAS, Google Scholar
- 48 . Nanostructured lipid carriers: a novel platform for chemotherapeutics. Curr. Drug Deliv. 13(1), 4–26 (2016). • An interesting update review on the application of nanostructure lipid carriers in cancer therapy.Crossref, Medline, CAS, Google Scholar
- 49 Glucosamine derivative modified nanostructured lipid carriers for targeted tumor delivery. J. Mater. Chem. 22(12), 5770 (2012).Crossref, CAS, Google Scholar
- 50 . Development and characterization of niosomal gel for topical delivery of benzoyl peroxide. Drug Deliv. 22(8), 1027–1042 (2015).Crossref, Medline, CAS, Google Scholar
- 51 . Development, optimization and evaluation of long chain nanolipid carrier for hepatic delivery of silymarin through lymphatic transport pathway. Int. J. Pharm. 485(1–2), 108–121 (2015).Crossref, Medline, CAS, Google Scholar
- 52 . Nanostructured lipid carrier versus solid lipid nanoparticles of simvastatin: comparative analysis of characteristics, pharmacokinetics and tissue uptake. Int. J. Pharm. 415(1), 232–243 (2011).Crossref, Medline, CAS, Google Scholar
- 53 Synthesis, characterization and radiolabeling of folic acid modified nanostructured lipid carriers as a contrast agent and drug delivery system. Appl. Radiat. Isot. 119, 72–79 (2017).Crossref, Medline, CAS, Google Scholar
- 54 64 Cu loaded liposomes as positron emission tomography imaging agents. Biomaterials 32(9), 2334–2341 (2011).Crossref, Medline, CAS, Google Scholar
- 55 . Tumor targeting of functionalized quantum dot-liposome hybrids by intravenous administration. Mol. Pharm. 6(2), 520–530 (2009).Crossref, Medline, CAS, Google Scholar
- 56 . Liposome application: problems and prospects. Curr. Opin. Colloid Interface Sci. 6(1), 66–77 (2001).Crossref, CAS, Google Scholar
- 57 . A novel method to label preformed liposomes with 64Cu for positron emission tomography (PET) imaging. Bioconjug. Chem. 19(12), 2577–2584 (2008).Crossref, Medline, CAS, Google Scholar
- 58 . Lipid-and polymer-based nanostructures for cancer theranostics. Theranostics 2(12), 1117–1126 (2012).Crossref, Medline, CAS, Google Scholar
- 59 Water-soluble superparamagnetic manganese ferrite nanoparticles for magnetic resonance imaging. Biomaterials 31(13), 3667–3673 (2010).Crossref, Medline, CAS, Google Scholar
- 60 Paramagnetic and fluorescent liposomes for target-specific imaging and therapy of tumor angiogenesis. Angiogenesis 13(2), 161–173 (2010).Crossref, Medline, CAS, Google Scholar
- 61 . Superparamagnetic iron oxide nanoparticles for delivery of therapeutic agents: opportunities and challenges. Expert Opin. Drug Deliv. 11(9), 1449–1470 (2014). •• A good update on the application of magnetic nanoparticles in medicine.Crossref, Medline, CAS, Google Scholar
- 62 A nanoscale, liposomal contrast agent for preclincal micro CT imaging of the mouse. AJR 186, 300–307 (2006).Crossref, Medline, Google Scholar
- 63 . Liposomes in ultrasound and gamma scintigraphic imaging. Methods in Enzymology 373 198–214 (2003). https://doi.org/10.1016/S0076-6879(03)73013-4.Crossref, Google Scholar
- 64 . Recent advances with liposomes as pharmaceutical carriers. Nat. Rev. Drug Discov. 4(2), 145–160 (2005).Crossref, Medline, CAS, Google Scholar
- 65 . Long-residence-time nano-scale liposomal iohexol for x-ray-based blood pool imaging. Acad. Radiol. 10(5), 475–483 (2003).Crossref, Medline, Google Scholar
- 66 . Controlled release from bilayer-decorated magnetoliposomes via electromagnetic heating. ACS Nano 4(6), 3215–3221 (2010).Crossref, Medline, CAS, Google Scholar
- 67 . Stimuli-responsive liposome-nanoparticle assemblies. Expert Opin. Drug Deliv. 8(8), 1025–1040 (2011).Crossref, Medline, CAS, Google Scholar
- 68 . Nanoparticle-triggered release from lipid membrane vesicles. N. Biotechnol. 32(6), 665–672 (2015).Crossref, Medline, CAS, Google Scholar
- 69 . Contrast agents for preclinical targeted x-ray imaging. Adv. Drug Deliv. Rev. 76, 116–133 (2014). • Explaining a novel technique in imaging.Crossref, Medline, CAS, Google Scholar
- 70 . Molecular imaging of cancer with positron emission tomography. Nat. Rev. Cancer 2(9), 683–693 (2002).Crossref, Medline, CAS, Google Scholar
- 71 . Molecular and cellular MR imaging. J. Nuclear Med. CRC Press 48(12), 2087–2087 (2007).
doi:10.2967/jnumed.107.045369 .Crossref, Google Scholar - 72 . Multimodal contrast agent for combined computed tomography and magnetic resonance imaging applications. Invest. Radiol. 41(3), 339–348 (2006).Crossref, Medline, Google Scholar
- 73 . Compositions and method for multimodal imaging. US20080206131A1 (2008).Google Scholar
- 74 . Contrast-enhanced magneto-photo-acoustic imaging in vivo using dual-contrast nanoparticles. Photoacoustics 2(2), 55–62 (2014).Crossref, Medline, Google Scholar
- 75 Engineering of lipid-coated PLGA nanoparticles with a tunable payload of diagnostically active nanocrystals for medical imaging. Chem. Commun. 48(47), 5835–5837 (2012).Crossref, Medline, CAS, Google Scholar
- 76 . Lipid coated upconverting nanoparticles as NIR remote controlled transducer for simultaneous photodynamic therapy and cell imaging. Int. J. Pharm. 466(1), 307–313 (2014).Crossref, Medline, CAS, Google Scholar
- 77 Novel temperature-sensitive liposomes with prolonged circulation time. Clin. Cancer Res. 10(6), 2168–2178 (2004).Crossref, Medline, CAS, Google Scholar
- 78 MRI monitoring of intratumoral drug delivery and prediction of the therapeutic effect with a multifunctional thermosensitive liposome. Biomaterials 32(27), 6570–6578 (2011).Crossref, Medline, CAS, Google Scholar
- 79 . Magnetic resonance imaging of high intensity focused ultrasound mediated drug delivery from temperature-sensitive liposomes: an in vivo proof-of-concept study. J. Control. Rel. 150(1), 102–110 (2011).Crossref, Medline, CAS, Google Scholar
- 80 . Liposomes: from a clinically established drug delivery system to a nanoparticle platform for theranostic nanomedicine. Acc. Chem. Res. 44(10), 1094–1104 (2011). •• An interesting review on the commercial development of nanoparticles.Crossref, Medline, CAS, Google Scholar
- 81 . Cellular compartmentalization of internalized paramagnetic liposomes strongly influences both T1 and T2 relaxivity. Magn. Reson. Med. 61(5), 1022–1032 (2009).Crossref, Medline, CAS, Google Scholar
- 82 A high relaxivity Gd(III)DOTA-DSPE-based liposomal contrast agent for magnetic resonance imaging. Eur. J. Pharm. Biopharm. 72(2), 397–404 (2009).Crossref, Medline, CAS, Google Scholar
- 83 Radiolabeling of lipid-based nanoparticles for diagnostics and therapeutic applications: a comparison using different radiometals. J. Liposome Res. 20(3), 219–227 (2010). • A comprehensive review on the application of radiolables by nanoliposomes.Crossref, Medline, CAS, Google Scholar

