Novel Liposome Nanoparticles for Tumor Magnetic Resonance Imaging
申请人:Medical Research Council
公开号:US20170348440A1
公开(公告)日:2017-12-07
The present invention provides novel liposomes comprising Gd.DOTA.DSA (gadolinium (III) 2-4,7-bis-carboxymethyl-10-[(N,N-distearylamidomethyl-N′-amido-methyl]-1,4,7,10-tetra-azacyclododec-1-yl}-acetic acid), characterised in that said liposome further comprises a neutral, fully saturated phospholipid component (e.g. DSPC (1,2-distearoyl-sn-glycero-3-phospocholine]), which are of particular use in the preparation of magnetic resonance contrast agents for enhancing a magnetic resonance image of tumours in a mammal.
The present invention provides a process for preparing a modified lipid of the formula
comprising reacting
(I) a compound of the formula; and
(ii) a compound of the formula
wherein component (ii) is formulated as a liposome; wherein B is a lipid; wherein A is a moiety of interest (MOI) and is a hydrocarbyl group; wherein X is an optional linker group;
wherein R
1
is H or a hydrocarbyl group; and
wherein R
2
is a lone pair, H or a hydrocarbyl group.
The moiety of interest A may be selected from a carbohydrate moiety, a polymer, a peptide, a glycoprotein, a small biomolecule (such as a folic acid derivative) and a bioconjugate linker.
Utilizing Combinatorial Chemistry and Rational Design: Peptidic Tweezers with Nanomolar Affinity to DNA Can Be Transformed into Efficient Vectors for Gene Delivery by Addition of a Lipophilic Tail
作者:Hannes Y. Kuchelmeister、Sarah Karczewski、Aljona Gutschmidt、Shirley Knauer、Carsten Schmuck
DOI:10.1002/anie.201306929
日期:2013.12.23
Into the library: Screening a focused library of 259 peptide tweezers, composed of two identical arms with zero to three amino acids and an artificial anion recognition site, yielded DNA binders with nanomolaraffinity. These ligands are only modest gene carriers (transfection efficiency <10 %); however, excellent transfection efficiencies (up to 90 %) were achieved after the covalent attachment of
The invention relates to a hyperthermia (focused ultrasound—FUS) method where an energy source is applied, repeatedly, to a desired part of the body to induce hyperthermia, e.g. using image guidance. Hyperthermia is applied after a drug or biopharmaceutical (API) and/or their labelled equivalents (theranostics) and/or their drug delivery systems has been administered to the live subject to cause the enhanced tissue distribution and/or controlled release of the drug, previously encapsulated in thermo-sensitive (lipid nano)particles, to a desired site of the body. Hyperthermia (Ultrasound) is then halted, and the site of interest. Hyperthermia is then applied again using image guidance to monitor drug's accumulation in the tissue. The drug and or the drug delivery system are also labelled (for imaging) to allow real time monitoring and modulation of the API in the human body which can be used to direct and guide the FUS at the site of interest.
The invention provides a (drug-containing) lipid nanoparticle with: (i) at least one phospholipid; (ii) at least one lysolipid; and (iii) at least one phospholipid comprising a hydrophilic polymer;and (iv) at least one structural lipid of formula (I) which has the following general structure: (I) wherein R and R' are long hydrocarbyl hydrophobic chains, Y is a linker element, and PHG is a polar head group described as large according to its van der Waals radius, and which is different from the phospholipid (i). The lipid nanoparticle can release a drug (or API) from within the lipid nanoparticleas a result of focussed ultrasound (FUS) applied continuously, at least twice, to a desired part of the body to induce hyperthermia (an increase in temperature). FUS is applied after the lipid nanoparticle containing the drug has been administered to the live subject, and causes controlled release of the drug at the desired site of the body. Ultrasound is then halted, and the site of interest allowed to cool. Ultrasound is then applied again. Lipidnanoparticles can be labelled (for MRI, NIRF imaging),enablin greal time monitoring of the drug in the human body. Imaging information can be used to direct and guide the nature of the FUS applied to the site of interest.