Name: lipidomics and transcriptomics in neurological diseases
Uploaded: 2022-03-18T12:30:00
Description: Watch this Scientific Journal Video about Lipidomics and Transcriptomics in Neurological Diseases at JoVE.com

We dedicate this article to Dr. Ermelinda Lomazzo. During the finalization of this manuscript, Dr. Ermelinda Lomazzo passed away. She is the embodiment of passion for science and selfless engagement in team work to fulfill a meaningful research purpose. She always dreamed of contributing meaningfully to the greater well-being of humans. Her goodhearted nature was never compromised by the strenuous roads of science and life. She will remain invaluable, and forever, in our hearts.
Julia M. Post was funded by Focus Program for Translational Neuroscience (FTN) at University Medical Center of the Johannes Gutenberg University Mainz and is currently funded by the SPP-2225 EXIT project to LB. Raissa Lerner was partially funded by DZHK project 81X2600250 to LB and Lipidomics Core Facility. Partial funding for these studies was provided by the Lipidomics Core Facility, Institute of Physiological Chemistry, and Intramural funds (to LB) from the University Medical Center of the Johannes Gutenberg University Mainz.

All experimental procedures described here are in accordance with The European Community&#39;s Council Directive of 22 September 2010 (2010/63EU) and were approved by the local animal committee of the state Rhineland-Palatinate, Germany (file reference: 23 177-07/G16-1-075).
1. Animal model of acute and prophylactically treated KA-induced epilepsy
<ol>
	<li>Perform seizure induction, treatment, and behavioral scoring.
	<ol>
		<li>Separate mice (minimum n = 6 mice per group) in single cages.<...

<ol>
	<li>Aronica, E., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Neuroinflammatory+targets+and+treatments+for+epilepsy+validated+in+experimental+models.">Neuroinflammatory targets and treatments for epilepsy validated in experimental models.</a> Epilepsia. 58, 27-38 (2017).</li><li>Lerner, R., Post, J., Loch, S., Lutz, B., Bindila, L. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Targeting+brain+and+peripheral+plasticity+of+the+lipidome+in+acute+kainic+acid-induced+epileptic+seizures+in+mice+via+quantitative+mass+spectrometry.">Targeting brain and peripheral plasticity of the lipidome in acute kainic acid-induced epileptic seizures in mice via quantitative mass spectrometry.</a> Biochimica et Biophysica Acta - Molecular and Cell Biology of Lipids. 1862 (2), 255-267 (2017).</li><li>Schuhmann, K., Almeida, R., Baumert, M., Herzog, R., Bornstein, S. R., Shevchenko, A. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Shotgun+lipidomics+on+a+LTQ+Orbitrap+mass+spectrometer+by+successive+switching+between+acquisition+polarity+modes.">Shotgun lipidomics on a LTQ Orbitrap mass spectrometer by successive switching between acquisition polarity modes.</a> Journal of Mass Spectrometry. 47 (1), 96-104 (2012).</li><li>Puppolo, M., Varma, D., Jansen, S. A. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=A+review+of+analytical+methods+for+eicosanoids+in+brain+tissue.">A review of analytical methods for eicosanoids in brain tissue.</a> Journal of Chromatography B: Analytical Technologies in the Biomedical and Life Sciences. 964, 50-64 (2014).</li><li>Blewett, A. J., Varma, D., Gilles, T., Libonati, J. R., Jansen, S. A. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Development+and+validation+of+a+high-performance+liquid+chromatography-electrospray+mass+spectrometry+method+for+the+simultaneous+determination+of+23+eicosanoids.">Development and validation of a high-performance liquid chromatography-electrospray mass spectrometry method for the simultaneous determination of 23 eicosanoids.</a> Journal of Pharmaceutical and Biomedical Analysis. 46 (4), 653-662 (2008).</li><li>Lerner, R., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Simultaneous+lipidomic+and+transcriptomic+profiling+in+mouse+brain+punches+of+acute+epileptic+seizure+model+compared+to+controls.">Simultaneous lipidomic and transcriptomic profiling in mouse brain punches of acute epileptic seizure model compared to controls.</a> Journal of Lipid Research. 59, 283-297 (2017).</li><li>Lerner, R., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Simultaneous+lipidomic+and+transcriptomic+profiling+in+mouse+brain+punches+of+acute+epileptic+seizure+model+compared+to+controls.">Simultaneous lipidomic and transcriptomic profiling in mouse brain punches of acute epileptic seizure model compared to controls.</a> Journal of Lipid Research. , 1-48 (2018).</li><li>L&#233;vesque, M., Avoli, M., Bernard, C. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Animal+models+of+temporal+lobe+epilepsy+following+systemic+chemoconvulsant+administration.">Animal models of temporal lobe epilepsy following systemic chemoconvulsant administration.</a> Journal of Neuroscience Methods. 260, (2016).</li><li>Eyo, U. B., Murugan, M., Wu, L. J. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Microglia-Neuron+Communication+in+Epilepsy.">Microglia-Neuron Communication in Epilepsy.</a> Glia. 65 (1), 5-18 (2017).</li><li>Zhu, J., Zheng, X. Y., Zhang, H. L., Luo, Q. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Kainic+acid-induced+neurodegenerative+model:+Potentials+and+limitations.">Kainic acid-induced neurodegenerative model: Potentials and limitations.</a> Journal of Biomedicine and Biotechnology. 2011, 457079 (2011).</li><li>Park, S. H., Sim, Y. B., Kim, C. H., Lee, J. K., Lee, J. H., Suh, H. W. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Role+of+&#945;-CGRP+in+the+regulation+of+neurotoxic+responses+induced+by+kainic+acid+in+mice.">Role of &#945;-CGRP in the regulation of neurotoxic responses induced by kainic acid in mice.</a> Peptides. 44, 158-162 (2013).</li><li>Lerner, R., Cuadrado, D. P., Post, J. M., Lutz, B., Bindila, L. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Broad+lipidomic+and+transcriptional+changes+of+prophylactic+PEA+administration+in+control+mice.">Broad lipidomic and transcriptional changes of prophylactic PEA administration in control mice.</a> Frontiers in Neuroscience. 13, 527 (2019).</li><li>Post, J. M., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Antiepileptogenic+Effect+of+Subchronic+Palmitoylethanolamide+Treatment+in+a+Mouse+Model+of+Acute+Epilepsy.">Antiepileptogenic Effect of Subchronic Palmitoylethanolamide Treatment in a Mouse Model of Acute Epilepsy.</a> Frontiers in Molecular Neuroscience. 11, (2018).</li><li>Schauwecker, P. E., Steward, O. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Genetic+determinants+of+susceptibility+to+excitotoxic+cell+death:+Implications+for+gene+targeting+approaches.">Genetic determinants of susceptibility to excitotoxic cell death: Implications for gene targeting approaches.</a> Proceedings of the National Academy of Sciences. 94 (8), 4103-4108 (2002).</li><li>Monory, K., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=The+Endocannabinoid+System+Controls+Key+Epileptogenic+Circuits+in+the+Hippocampus.">The Endocannabinoid System Controls Key Epileptogenic Circuits in the Hippocampus.</a> Neuron. 51 (4), 455-466 (2006).</li><li>Konsman, J. P. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=The+mouse+Brain+in+Stereotaxic+Coordinates.">The mouse Brain in Stereotaxic Coordinates.</a> Psychoneuroendocrinology. 28 (6), (2003).</li><li>Spijker, S., Li, K. W. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Dissection+of+Rondent+Brain+Regions.">Dissection of Rondent Brain Regions.</a> Neuroproteomics. 57, 13-27 (2011).</li><li>Gross, R. W. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=The+evolution+of+lipidomics+through+space+and+time.">The evolution of lipidomics through space and time.</a> Biochimica et Biophysica Acta - Molecular and Cell Biology of Lipids. 1862 (8), 731-739 (2017).</li><li>Wang, M., Wang, C., Han, R. H., Han, X. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Novel+advances+in+shotgun+lipidomics+for+biology+and+medicine.">Novel advances in shotgun lipidomics for biology and medicine.</a> Progress in Lipid Research. 61, 83-108 (2016).</li><li>Abbott, S. K., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=An+improved+high-throughput+lipid+extraction+method+for+the+analysis+of+human+brain+lipids.">An improved high-throughput lipid extraction method for the analysis of human brain lipids.</a> Lipids. 48 (3), 307-318 (2013).</li><li>Matyash, V., Liebisch, G., Kurzchalia, T. V., Shevchenko, A., Schwudke, D. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Lipid+extraction+by+methyl-tert-butyl+ether+for+high-throughput+lipidomics.">Lipid extraction by methyl-tert-butyl ether for high-throughput lipidomics.</a> Journal of Lipid Research. 49 (5), 1137-1146 (2008).</li></ol>

The neurolipidomic and transcriptomic methodology described here is a viable mean to investigate any disease or healthy development at high and low spatial resolution in the brain and peripheral organs. Due to the optimized plasma sampling and handling procedures, plasma lipidomic analysis can also be carried out from the same animals sacrificed for tissue lipidomics and transcriptomics, thus improving the reliability of tissue blood molecular correlates and biomarker discovery. The provision of a broad set of data by ap...

Recent advances in the function of lipids and their role in the onset and progression of neurological diseases open new research and development venues of new therapeutic targets and disease mechanism elucidation1. Documented differences in lipid composition in different brain regions, emphasized by modern molecular imaging techniques such as mass spectrometry imaging and advanced mass spectrometry profiling, shifts the paradigm of lipid investigation from whole brain toward functionally distinct and discrete brain regions. The fact that lipid composition varies in different brain regions prompts new conceptualization of both membrane lipid sensitivity and downstream lipid signaling in response to a brain insult or stimuli across the functionally distinct brain regions. Hence, lipid protocols require new developments to address the challenge of low tissue amounts for higher spatial resolution detection and quantification, and concurrently, analysis of multiple lipid components of cell membranes and signaling pathways. Also, determination of enzymes, lipid ligands, and receptors involved in the regulation of their levels and function is paramount to elucidate the signaling pathways affected in a neurological disease and guide new mechanistic investigations in a pathophysiological context.
In addition to the increased brain spatial resolution, there are two major difficulties challenging the development of new neurolipidomic approaches. First, the lipid signaling molecules are typically of very low abundance compared to membrane constitutive lipids. Second, the lipidome exhibits a high structural heterogeneity, difficult to dissect using a single analytical approach. Hence, extraction and analytical methods are tailored to different lipid categories and commonly performed in distinct tissue samples2. Shotgun lipidomic methods3 are excellent tools to rapidly reveal a broad profile of membrane lipids, while increased sensitivity and selectivity afforded by the targeted discovery and quantification mass spectrometric methods are capitalized upon for investigation of low abundant signaling lipids including: i) inflammatory lipids and ii) lipids involved in the modulation of neuronal activity, such as endocannabinoids (eCBs), amino acid-linked lipids, etc.4,5. To encompass lipid changes at both the cell membrane and&#160;signaling level occurring in brain regions of neurological disease models, typically the lipid extraction and analysis are carried out in distinct tissue samples, obtained from distinct animal batches or from different hemispheres, or by dissecting a larger tissue region into multiple pieces. When mRNA levels of enzyme receptors are also of interest, their investigation typically requires the procurement of a distinct tissue sample. For example, the investigation of membrane lipids, endogenous cannabinoids, and mRNA would require three different tissue samples, (e.g., two samples for the two lipid extraction methods-membrane lipids and signaling lipids- and subsequent two lipid analysis methods- and one sample for mRNA analysis). Investigation of inflammatory lipids and endogenous cannabinoids require two distinct tissue samples, extraction methods, and analysis methods, respectively. Another example is the investigation of mRNA and of any lipid category in a brain punch or laser microdissection sample which consequently requires two distinct animals to procure two samples per brain (sub)region. A substantial extent of variability and/or poor reproducibility of the results frequently occur in such cases, originating from biological variability and/or tissue heterogeneity. Guided by these practical limitations of multimolecular analysis, occurring particularly at high spatial resolution in the brain, a three-module neurolipidomics protocol was designed encompassing: 1) coextraction and co-analysis by LC/MRM of inflammatory lipids (e.g., eicosanoids (eiCs)) and lipids involved in modulation of neuronal activity, such as eCBs2; 2) co-extraction of phospholipids (PLs) and eCBs with subsequent multiscan LC/MRM and precursor/neutral loss scan analysis2; and 3) dual extraction of membrane (phospho)lipids and eCBs as well as mRNA, with subsequent LC/MRM and qPCR or RNA sequencing analysis6. Depending on the biological question to be addressed in a neurological disease and the brain region of interest, a combination of the first and the second protocol, or the first and the third protocol, can be applied on the same tissue specimen for tissues weighing around 4 mg. The first and third protocols can be independently applied for tissues around 2 mg. The second protocol can be applied for tissues weighing as little as 0.5 mg. Irrespective of the neurolipidomic protocol module selected, the tissue sampling and pre-analytical processing, the brain isolation and region dissection, as well as the procedure for sacrificing the animal model are standardized and identical for all three modules of the protocol. In our investigation of neurological diseases, peripheral organs that are relevant for the pathological consequences of the disease are always also collected and analyzed using these modular protocols. Additionally, blood is regularly sampled for plasma lipidomics to serve as a readout tool of neurological diseases with a view on prospective translational applications. The here presented modular lipidomics protocol is very versatile: scaleable to larger tissue amounts and readily applicable for virtually any tissue type and disease. For the application of the modular protocol (Figure 1) in neurological diseases, any standardized rodent model of onset and progression of neurological disorders, such as traumatic brain injury, Parkinson&#39;s disease, Alzheimer&#39;s disease, or epilepsy are amenable.
These protocols have been extensively applied to study changes in the tissue lipidome and/or transcriptome at the acute phase of epilepsy in the kainic acid (KA)-induced mouse model of epilepsy2,7, a model widely used in preclinical studies due to the resemblance to human temporal lobe epilepsy (TLE)8,9,10,11. Using these protocols, the therapeutic potential of drugs such as Palmitoylethanolamide (PEA)12,13 was assessed in the same mouse model of epilepsy. The study identified lipid and mRNA changes at high and low spatial resolution in the brain and periphery, at the time point of maximal acute seizure intensities (at 60 min postseizure induction), and upon subchronic and acute treatment with PEA at four different timepoints (20, 60, 120, and 180 min) post KA-seizure induction, a time-window covering the acute phase of epilepsy. Plasma, brains, and peripheral organs of untreated KA-injected mice, acute and subchronically PEA-treated mice, as well as vehicle and PEA-vehicle control mice, were collected at each time point12,13, and investigated with this molecular analysis. The molecular data were correlated with behavioral phenotypes obtained by seizure scoring, as well as with immunohistochemistry-derived data on neurodegenerative processes, in order to unravel the progression of the acute epilepsy phase and PEA&#39;s potential to alleviate it.

<table border="1" fo:keep-together.within-page="1" fo:keep-with-next.within-page="always">
	<tbody>
		<tr>
			<td>12(S)-HETE</td>
			<td>Biomol</td>
			<td>Cay10007248-25</td>
			<td>Lipid Std</td>
		</tr>
		<tr>
			<td>12(S)-HETE-d8</td>
			<td>Biomol</td>
			<td>Cay334570-25</td>
			<td>Lipid Std</td>
		</tr>
		<tr>
			<td>1200 series LC System</td>
			<td>Agilent</td>
			<td></td>
			<td>Instrumentation/LCMS</td>
		</tr>
		<tr>
			<td>2100 Bioanalyzer</td>
			<td>Agilent</td>
			<td></td>
			<td>Instrumentation/qPCR</td>
		</tr>
		<tr>
			<td>5(S)-HETE-d8</td>
			<td>Biomol</td>
			<td>Cay 334230</td>
			<td>Lipid Std</td>
		</tr>
		<tr>
			<td>ABI 7300 Real-Time PCR cycler</td>
			<td>Applied Biosystems</td>
			<td></td>
			<td>Instrumentation/qPCR</td>
		</tr>
		<tr>
			<td>Acetonitrile LC-MS Chroma Solv</td>
			<td>Honeywell</td>
			<td>9814920</td>
			<td>Solvent/LCMS</td>
		</tr>
		<tr>
			<td>amber eppendorf tubes</td>
			<td>Eppendorf</td>
			<td></td>
			<td>Sample Prep.</td>
		</tr>
		<tr>
			<td>Analyst 1.6.2 Software</td>
			<td>AB SCIEX, Darmstadt</td>
			<td></td>
			<td>Software</td>
		</tr>
		<tr>
			<td>Analytical balance</td>
			<td>Mettler Toledo</td>
			<td></td>
			<td>Instrumentation/Sample prep.</td>
		</tr>
		<tr>
			<td>Arachidonic Acid-d8 MS Standard</td>
			<td>Biomol</td>
			<td>Cay-10007277</td>
			<td>Lipid Std</td>
		</tr>
		<tr>
			<td>Bessmann Tissue Pulverizer</td>
			<td>Spectrum Laboratories, Inc. (Breda, Netherlands)</td>
			<td></td>
			<td>Instrumentation/Sample prep.</td>
		</tr>
		<tr>
			<td>Bino</td>
			<td>Zeiss</td>
			<td></td>
			<td>Microscopy</td>
		</tr>
		<tr>
			<td>cleaved Caspase 3 antibody</td>
			<td>Cellsignaling</td>
			<td>9661S</td>
			<td>Microscopy</td>
		</tr>
		<tr>
			<td>Cryostat, Leica CM3050 S</td>
			<td>Leica Biosystems</td>
			<td></td>
			<td>Instrumentation/Sample prep.</td>
		</tr>
		<tr>
			<td>CTC HTC PAL autosampler</td>
			<td>CTC Analytics AG</td>
			<td></td>
			<td>Instrumentation/LCMS</td>
		</tr>
		<tr>
			<td>Dumont Curved Forceps Dumoxel #7</td>
			<td>FST</td>
			<td>11271-30</td>
			<td>Surgical Tools</td>
		</tr>
		<tr>
			<td>Dumont Forceps Super fine tip #5SF (x2)</td>
			<td>FST</td>
			<td>11252-00</td>
			<td>Surgical Tools</td>
		</tr>
		<tr>
			<td>EDTA 1000 A R&#246;hrchen</td>
			<td>Kabe Labortechnik</td>
			<td>078001</td>
			<td>Sample Prep.</td>
		</tr>
		<tr>
			<td>EP-1 EconoPump</td>
			<td>BioRAD</td>
			<td>700BR07757</td>
			<td>Instrumentation/Sample prep.</td>
		</tr>
		<tr>
			<td>Fine Forceps Mirror Finish</td>
			<td>FST</td>
			<td>11412-11</td>
			<td>Surgical Tools</td>
		</tr>
		<tr>
			<td>Fine Iris Scissors straight sharp</td>
			<td>FST</td>
			<td>14094-11</td>
			<td>Surgical Tools</td>
		</tr>
		<tr>
			<td>Fine Scissor Tungsten Carbide straight</td>
			<td>FST</td>
			<td>14568-09</td>
			<td>Surgical Tools</td>
		</tr>
		<tr>
			<td>Iris Spatulae</td>
			<td>FST</td>
			<td>10094-13</td>
			<td>Surgical Tools</td>
		</tr>
		<tr>
			<td>Kainic acid</td>
			<td>Abcam</td>
			<td>ab120100</td>
			<td>Epileptic drug</td>
		</tr>
		<tr>
			<td>Lipid View software</td>
			<td>AB SCIEX, Darmstadt</td>
			<td></td>
			<td>Software</td>
		</tr>
		<tr>
			<td>LPC 17:0</td>
			<td>Avanis Polaris</td>
			<td>855676P</td>
			<td>Lipid Std</td>
		</tr>
		<tr>
			<td>LPC 18:0</td>
			<td>Avanis Polaris</td>
			<td>855775P</td>
			<td>Lipid Std</td>
		</tr>
		<tr>
			<td>Luna 2,5&#181;m C18(2)- HAST 100A LC column</td>
			<td>Phenomenex</td>
			<td>00D-4446-B0</td>
			<td>Instrumentation/LCMS</td>
		</tr>
		<tr>
			<td>Magnifying lamp</td>
			<td>Maul GmbH</td>
			<td></td>
			<td>Instrumentation/Sample prep.</td>
		</tr>
		<tr>
			<td>Methanol LC-MS Chroma Solv 99.9%</td>
			<td>Honeywell</td>
			<td>9814920</td>
			<td>Solvent/LCMS</td>
		</tr>
		<tr>
			<td>Motic Camara</td>
			<td>Motic</td>
			<td></td>
			<td>Microscopy</td>
		</tr>
		<tr>
			<td>MTBE</td>
			<td>Honeywell</td>
			<td>34875-1L</td>
			<td>Solvent/LCMS</td>
		</tr>
		<tr>
			<td>MultiQuant 3.0 quantitation software package</td>
			<td>AB SCIEX, Darmstadt</td>
			<td></td>
			<td>Software</td>
		</tr>
		<tr>
			<td>NanoDrop 2000c Spectrophotometer</td>
			<td>Thermo Scientific</td>
			<td></td>
			<td>Instrumentation/qPCR</td>
		</tr>
		<tr>
			<td>PA 16:0-18:1</td>
			<td>Avanis Polaris</td>
			<td>840857P</td>
			<td>Lipid Std</td>
		</tr>
		<tr>
			<td>PA 17:0-14:1</td>
			<td>Avanis Polaris</td>
			<td>LM-1404</td>
			<td>Lipid Std</td>
		</tr>
		<tr>
			<td>Palmitoyl Ethanolamide</td>
			<td>Biomol</td>
			<td>Cay90350-100</td>
			<td>Lipid Std</td>
		</tr>
		<tr>
			<td>Palmitoyl Ethanolamide-d5</td>
			<td>Biomol</td>
			<td>Cay9000573-5</td>
			<td>Lipid Std</td>
		</tr>
		<tr>
			<td>PC 16:0-18:1</td>
			<td>Avanis Polaris</td>
			<td>850457P</td>
			<td>Lipid Std</td>
		</tr>
		<tr>
			<td>PC 16:0-18:1</td>
			<td>Avanis Polaris</td>
			<td>850457P</td>
			<td>Lipid Std</td>
		</tr>
		<tr>
			<td>PC 17:0-14:1</td>
			<td>Avanis Polaris</td>
			<td>LM-1004</td>
			<td>Lipid Std</td>
		</tr>
		<tr>
			<td>PE 16:0-18:1</td>
			<td>Avanis Polaris</td>
			<td>850757P</td>
			<td>Lipid Std</td>
		</tr>
		<tr>
			<td>PE 17:0-14:1</td>
			<td>Avanis Polaris</td>
			<td>LM-1104</td>
			<td>Lipid Std</td>
		</tr>
		<tr>
			<td>PG 16:0-18:1</td>
			<td>Avanis Polaris</td>
			<td>840457P</td>
			<td>Lipid Std</td>
		</tr>
		<tr>
			<td>PG 17:0-14:1</td>
			<td>Avanis Polaris</td>
			<td>LM-1204</td>
			<td>Lipid Std</td>
		</tr>
		<tr>
			<td>PI 17:0-14:1</td>
			<td>Avanis Polaris</td>
			<td>LM-1504</td>
			<td>Lipid Std</td>
		</tr>
		<tr>
			<td>Precelleys 24</td>
			<td>Peqlab</td>
			<td></td>
			<td>Instrumentation/Sample prep.</td>
		</tr>
		<tr>
			<td>Precellys Keramik-K&#252;gelchen</td>
			<td>Peqlab</td>
			<td>91-pcs-ck14p</td>
			<td>Sample Prep.</td>
		</tr>
		<tr>
			<td>Precellys Stahlkugeln 2,8mm</td>
			<td>Peqlab</td>
			<td>91-PCS-MK28P</td>
			<td>Sample Prep.</td>
		</tr>
		<tr>
			<td>Precellys-keramik-kit 1,4 mm</td>
			<td>VWR</td>
			<td>91-PCS-CK14</td>
			<td>Sample Prep.</td>
		</tr>
		<tr>
			<td>Prostaglandin D2</td>
			<td>Biomol</td>
			<td>Cay 12010</td>
			<td>Lipid Std</td>
		</tr>
		<tr>
			<td>Prostaglandin D2-d4</td>
			<td>Biomol</td>
			<td>Cay 312010</td>
			<td>Lipid Std</td>
		</tr>
		<tr>
			<td>Prostaglandin E2</td>
			<td>Biomol</td>
			<td>Cay10007211-1</td>
			<td>Lipid Std</td>
		</tr>
		<tr>
			<td>Prostaglandin E2-d9</td>
			<td>Biomol</td>
			<td>Cay10581-50</td>
			<td>Lipid Std</td>
		</tr>
		<tr>
			<td>PS 17:0-14:1</td>
			<td>Avanis Polaris</td>
			<td>LM-1304</td>
			<td>Lipid Std</td>
		</tr>
		<tr>
			<td>Q Trap 5500 triple-quadrupole linear ion trap MS</td>
			<td>AB SCIEX</td>
			<td>AU111609004</td>
			<td>Instrumentation/LCMS</td>
		</tr>
		<tr>
			<td>Real Time PCR System</td>
			<td>Appliert Biosystem</td>
			<td></td>
			<td>Instrumentation/qPCR</td>
		</tr>
		<tr>
			<td>Resolvin D1</td>
			<td>Biomol</td>
			<td>Cay10012554-11</td>
			<td>Lipid Std</td>
		</tr>
		<tr>
			<td>Rneasy Mini Kit - RNAase-Free DNase Set (50)</td>
			<td>Qiagen</td>
			<td>79254</td>
			<td>Sample Prep.</td>
		</tr>
		<tr>
			<td>Security Guard precolumn</td>
			<td>Phenomenex</td>
			<td></td>
			<td>Instrumentation/LCMS</td>
		</tr>
		<tr>
			<td>Shandon coverplates</td>
			<td>Thermo Fisher</td>
			<td>72110017</td>
			<td>Microscopy</td>
		</tr>
		<tr>
			<td>Shandon slide rack and lid</td>
			<td>Thermo Fisher</td>
			<td>73310017</td>
			<td>Microscopy</td>
		</tr>
		<tr>
			<td>SM 18:0</td>
			<td>Avanis Polaris</td>
			<td>860586P</td>
			<td>Lipid Std</td>
		</tr>
		<tr>
			<td>SM d18:1/12:0</td>
			<td>Avanis Polaris</td>
			<td>LM-2312</td>
			<td>Lipid Std</td>
		</tr>
		<tr>
			<td>Standard Forceps straight Smooth</td>
			<td>FST</td>
			<td>11016-17</td>
			<td>Surgical Tools</td>
		</tr>
		<tr>
			<td>Surgical Scissor ToughCut Standard Pattern</td>
			<td>FST</td>
			<td>14130-17</td>
			<td>Surgical Tools</td>
		</tr>
		<tr>
			<td>T3000 Thermocycler</td>
			<td>Biometra</td>
			<td></td>
			<td>Instrumentation/qPCR</td>
		</tr>
		<tr>
			<td>Thromboxane B2</td>
			<td>Biomol</td>
			<td>Cay19030-5</td>
			<td>Lipid Std</td>
		</tr>
		<tr>
			<td>Thromboxane B2-d4</td>
			<td>Biomol</td>
			<td>Cay319030-25</td>
			<td>Lipid Std</td>
		</tr>
		<tr>
			<td>Tissue Lyser II</td>
			<td>Qiagen/ Retsch</td>
			<td>12120240804</td>
			<td>Instrumentation/Sample prep.</td>
		</tr>
		<tr>
			<td>Tissue Tek</td>
			<td>Sakura Finetek</td>
			<td>4583</td>
			<td>Microscopy</td>
		</tr>
		<tr>
			<td>Toluidinblau</td>
			<td>Roth</td>
			<td>0300.2</td>
			<td>Microscopy</td>
		</tr>
		<tr>
			<td>Vapotherm</td>
			<td>Barkey</td>
			<td>4004734</td>
			<td>Instrumentation/Sample prep.</td>
		</tr>
		<tr>
			<td>Wasser LC-MS Chroma Solv</td>
			<td>VWR</td>
			<td>9814920</td>
			<td>Solvent/LCMS</td>
		</tr>
	</tbody>
</table>

lipidomics and transcriptomics in neurological diseases

Lipids serve as the primary interface to brain insults or stimuli conducive to neurological diseases and are a reservoir for the synthesis of lipids with various signaling or ligand function that can underscore the onset and progression of diseases. Often changing at the presymptomatic level, lipids are an emerging source of drug targets and biomarkers. Many neurological diseases exhibit neuroinflammation, neurodegeneration, and neuronal excitability as common hallmarks, partly modulated by specific lipid signaling systems. The interdependence and interrelation of synthesis of various lipids prompts a multilipid, multienzyme, and multireceptor analysis in order to derive the commonalities and specificities of neurological contexts and to expedite the unravelling of mechanistic aspects of disease onset and progression. Ascribing lipid roles to distinct brain regions advances the determination of lipid molecular phenotype and morphology associated with a neurological disease.
Presented here is a modular protocol suitable for the analysis of membrane lipids and downstream lipid signals along with mRNA of enzymes and mediators underlying their functionality, extracted from discrete brain regions that are relevant for a particular neurological disease and/or condition. To ensure accurate comparative lipidomic profiling, the workflows and operating criteria were optimized and standardized for: i) brain sampling and dissection of regions of interest, ii) co-extraction of multiple lipid signals and membrane lipids, iii) dual lipid/mRNA extraction, iv) quantification by liquid chromatography multiple reaction monitoring (LC/MRM), and v) standard mRNA profiling. This workflow is amenable for the low tissue amounts obtained by sampling of the functionally discrete brain subregions (i.e. by brain punching), thus preventing bias in multimolecular analysis due to tissue heterogeneity and/or animal variability. To reveal peripheral consequences of neurological diseases and establish translational molecular readouts of neurological disease states, peripheral organ sampling, processing, and their subsequent lipidomic analysis, as well as plasma lipidomics, are also pursued and described. The protocol is demonstrated on an acute epilepsy mouse model.

The set of described protocols may be combined on different levels in an aim-specific fashion, such as choice of animal model, route of sampling, method of extraction and profiling (Figure 1).
In order to determine lipid level changes in the brain and periphery over a time course of an acute epileptic seizure state and to unravel the potential antiepileptic effect13 of PEA an...

Watch this Scientific Journal Video about Lipidomics and Transcriptomics in Neurological Diseases at JoVE.com

Lipidomics and Transcriptomics in Neurological Diseases

This article presents a modular protocol for tissue lipidomics and transcriptomics, and plasma lipidomics in neurological disease mouse models targeting lipids underlying inflammation and neuronal activity, membrane lipids, downstream messengers, and mRNA-encoding enzymes/receptors underlying lipid function. Sampling, sample processing, extraction, and quantification procedures are outlined.

Lipids serve as the primary interface to brain insults or stimuli conducive to neurological diseases and are a reservoir for the synthesis of lipids with ...

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