Method for phenotyping using nmr spectroscopy
The invention relates to methods for phenotyping by determining protein activity in vivo using at least one probe compound and enhancing the nuclear polarisation of NMR active nuclei present in the probe compound (hereinafter termed “hyperpolarisation”) prior to NMR analysis.
1 . A method for phenotyping of a human individual comprising determining in vivo protein activity and thereby obtaining a characteristic of said human individual, the determination comprising
a) hyperpolarising the NMR active nuclei of samples collected from a human individual preadministered with at least one probe compound containing at least one NMR active nuclei, and
b) analysing said samples by NMR spectroscopy.
2 . The method according to claim 1 , wherein only one probe compound containing at least one NMR active nuclei is used.
3 . The method according to claim 1 , wherein more than one probe compound containing at least one NMR active nuclei is used.
4 . The method according to claim 1 , further comprising the step of determining the activity of at least one of several proteins and isoenzymes and thus obtaining a set of characteristics of said human individual.
5 . The method according to claim 1 , wherein the method is carried out for several human individuals and thus characteristics of said several human individuals are obtained.
6 . The method according to claim 5 , further comprising the step of grouping human individuals who exhibit the same or similar characteristics.
7 . The method according to claim 6 , further comprising the step of phenotyping of a clinical trial group
8 . The method according to claim 1 , further comprising the step of comparing said characteristic of said human individual with characteristics of other human individuals, and thereby classifying said human individual into a group.
9 . The method according to claim 8 , further comprising the step of phenotyping of said human individual prior to said human individual receiving a therapeutic drug treatment.
10 . The method according to claim 1 , wherein the at least one probe compound is enriched with NMR active nuclei.
11 . The method according to claim 1 , wherein hyperpolarisation is carried out by means of polarisation transfer from a noble gas, brute force, dynamic nuclear polarisation (DNP) or spin refrigeration.
12 . The method according to claim 1 , wherein the collected samples are biofluids.
13 . The method according to claim 1 , wherein the protein activity to be determined is the activity of a protein selected from the group consisting of NADPH quinone oxireductases, CYP450, N-acetyltransferase, glutathione transferase, thiomethyltransferase, thiopurine methyltransferase, pseudocholinesterase, sulfotransferase, UDP-glucuronosyl transferase, serotonin transport protein, ATP binding cassette (ABC's) and p-glycoprotein.
14 . The method according to claim 1 , wherein the at least one probe compound is a substrate, inducer or inhibitor for Cytochrome P 450 (CYP450)
15 . The method according to claim 14 , wherein the at least one probe compound is a substrate, inducer or inhibitor for a CYP 450 isoenzyme selected from the group consisting of CYP1A2, CYP2A6, CYP2C8/9, CYP2C19, CYP2D6, CYP2E1 and CYP3A4.
16 . The method according to claim 1 , wherein the at least one probe compound is selected from the group consisting of phenacetin, coumarin, tolbutamide, phenyloin, mephenyloin, S-mephenyloin, bufuralol, chlorzoxazone, midazolam, caffeine, dapsone, diclofenac, debrisoquine, bupropion, antipyrine, dextromethorphan, warfarin, diazepam, alprazolam, triazolam, flurazepam, chlodiazepoxide theophylline, phenobarbital propranolol, metoprolol, labetalol, nifedipine, digitoxin, quinidine, mexiletine, lidocaine, imipramine, flurbiprofen, omeprazole, terfenadine, furafylline, codeine, nicotine, sparteine, erythromycin, benzoylcholine, butrylcholine, paraoxon, para-aminosalicylic acid, isoniazid, sulfamethazine, 5-fluorouracil, trans-stilbene oxide, D-penicillamine, captopril, ipomeanol, cyclophosphamide, halothane, zidovudine, testosterone, acetaminophen, hexobarbital, carbamazepine, cortisol, oltipraz, cyclosporin A and paclitaxel.