Name: assay development for high content quantification of sod1 mutant protein aggregate formation in living cells
Uploaded: 2017-10-04T12:15:00
Description: Watch this Scientific Journal Video about Assay Development for High Content Quantification of Sod1 Mutant Protein Aggregate Formation in Living Cells at JoVE.com

This work was supported by a grant funded by the Korean government (MSIP) (NRF-2014K1A4A7A01074642), and the National Research Foundation of Korea (NRF) individual scientist support program (NRF-2013M3A9B5076486/NRF-2015R1D1A1A09057239).

1. Lentivirus production
NOTE: The production and manipulation of lentiviral vectors was carried out according to the National Institutes of Health (NIH) guidelines for research involving recombinant DNA. The plasmid encoding the wild-type and A4V mutant SOD1 tagged with enhanced YFP (SOD1WT-YFP and SOD1A4V-YFP) are described in Kim et al.11 Both gene fusion products were amplified using the PCR primer pair 5&#8242;-ATCGTCTAGACACCATGGCGACGAAGGTCGTGTGC-3&#8242; an...

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There are two main approaches for generating stable cell lines. The first takes several weeks and requires transient transfection and resistance selection of the genomic integrated plasmid DNA vectors. The second takes a matter of hours through the use of lentivirus, making this protocol amenable to the effective expression of target protein in multiple cell lines with limited effort. The TRIP-CMV vector19 was a sustained vector to use, with conserved transduction efficiency and stable transgene e...

Protein aggregation is a biological process by which misfolded proteins group up and may act as causative agents in neurodegenerative diseases (amyloidosis). Characterizing protein aggregation is essential in understanding the role of aggregates in cellular dysfunction as well as in facilitating the discovery of new factors that influence the onset of the pathology. The visualization of fluorescence-tagged proteins in living cells is a powerful method which may aid in the development of assays applicable to high content screening (HCS)1,2,3,4.
Amyotrophic lateral sclerosis (ALS) is regarded as a proteopathic disease caused by the presence of misfolded proteins with the propensity to aggregate and accumulate in motor neurons in both familial ALS (fALS) and sporadic ALS (sALS)5,6. A subset of ~20% of fALS cases are associated with dominant mutations in the gene encoding the cytosolic antioxidant enzyme copper-zinc superoxide dismutase type 1 (SOD1)7,8. Several potential causes for this genetically derived dysfunction have been proposed, including changes in the structure and function of SOD1 variants, such as aberrant stability, increased unfolding rate, and propensity to aggregate9,10. Notably, the only verified and potentially toxic property shared by both ALS-linked SOD1 variants and wild-type (WT) SOD1 is an increased propensity to form compartmentalized protein aggregates or proteinaceous inclusions11,12. Misfolded mutant SOD1, is persistently polyubiquitinated and degraded by the ubiquitin-proteasome system. As a result, a low level of inhibition of proteasome activity leads to the accumulation of mutant SOD1 aggregates13,14, which form amorphous structures composed of soluble components that can exchange with soluble mutant SOD1 in the cytosol15. In particular, SOD1 mutant A4V (alanine at codon 4 changed to valine) is the most common ALS-causing mutation, and leads to rapid neurodegeneration with an average survival time of less than 2 years after disease onset16. Biochemically, SOD1 A4V has an increased tendency to monomerize, aggregate, and form amyloid pores; its pore-like aggregates are similar to amyloid pores of other disease-linked mutant forms, such as &#945;-synuclein and &#946;-amyloid protein17. To study the dynamics of SOD1-aggregate accumulation, methods for monitoring soluble and insoluble SOD1 aggregate forms remain to be developed.
We have previously shown, using live-cell imaging and HEK-293 cells transiently transfected with fluorescent protein-tagged SOD1, that ALS-associated mutations impair SOD1 dimerization and aggregation11. Although transient expression systems can provide useful information about the biological outcome of short-term gene overexpression, methods providing stable integration of desired genes may be preferred for assay development. As such, lentiviral vectors offer the ability to confer long-term and regulated gene expression on mammalian cells 18. In this study, we focused on the generation of stable cell lines transduced with recombinant lentivirus bearing WT and mutant SOD1 tagged with yellow fluorescent protein (YFP). Using live-cell imaging microscopy and automated quantification of SOD1 aggregation, we triggered and quantified SOD1 aggregation events upon inhibition of the proteasome.

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			<td>ALLN (C20H37N3O4)</td>
			<td>Millipore</td>
			<td>208719</td>
			<td></td>
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		<tr>
			<td>MG132 (C26H41N3O5)</td>
			<td>Sigma-Aldrich</td>
			<td>C2211</td>
			<td></td>
		</tr>
		<tr>
			<td>Epoxomicin (C28H50N4O7)</td>
			<td>Sigma-Aldrich</td>
			<td>E3652</td>
			<td></td>
		</tr>
		<tr>
			<td>Hoechst 33342</td>
			<td>Invitrogen</td>
			<td>H-3570</td>
			<td></td>
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			<td>Opera</td>
			<td>Perkin Elmer</td>
			<td>OP-QEHS-01</td>
			<td></td>
		</tr>
		<tr>
			<td>Opera EvoShell software</td>
			<td>Perkin Elmer</td>
			<td>Ver 1.8.1</td>
			<td></td>
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		<tr>
			<td>Operetta</td>
			<td>Perkin Elmer</td>
			<td>OPRT1288</td>
			<td></td>
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		<tr>
			<td>Harmony Imaging software</td>
			<td>Perkin Elmer</td>
			<td>Ver 3.0.0</td>
			<td></td>
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			<td>Columbus Image analysis software</td>
			<td>Perkin Elmer</td>
			<td>Ver 2.3.2</td>
			<td></td>
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			<td>CyBi Hummingwell liquid handling</td>
			<td>CyBio AG</td>
			<td>OL 3387 3 0110</td>
			<td></td>
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assay development for high content quantification of sod1 mutant protein aggregate formation in living cells

Amyotrophic lateral sclerosis (ALS) is a fatal neurodegenerative disease that can be caused by inherited mutations in the gene encoding copper-zinc superoxide dismutase 1 (SOD1). The structural instability of SOD1 and the detection of SOD1-positive inclusions in familial-ALS patients supports a potential causal role for misfolded and/or aggregated SOD1 in ALS pathology. In this study, we describe the development of a cell-based assay designed to quantify the dynamics of SOD1 aggregation in living cells by high content screening approaches. Using lentiviral vectors, we generated stable cell lines expressing wild-type and mutant A4V SOD1 tagged with yellow fluorescent protein and found that both proteins were expressed in the cytosol without any sign of aggregation. Interestingly, only SOD1 A4V stably expressed in HEK-293, but not in U2OS or SH-SY5Y cell lines, formed aggregates upon proteasome inhibitor treatment. We show that it is possible to quantify aggregation based on dose-response analysis of various proteasome inhibitors, and to track aggregate-formation kinetics by time-lapse microscopy. Our approach introduces the possibility of quantifying the effect of ALS mutations on the role of SOD1 in aggregate formation as well as screening for small molecules that prevent SOD1 A4V aggregation.

Generating stable cell line using lentivirus: The overall strategy for monitoring SOD1 protein aggregates is illustrated in Figure 1. In a first step, we generated a lentiviral expression vector for SOD1 stable gene delivery into cell lines (Step 1). Two lentiviral vectors encoding YFP-tagged SOD1 WT and SOD1 A4V (SOD1WT-YFP and SOD1A4V-YFP, respectively) with packing and envelope plasmids were prepared (Figure 2A</strong...

Watch this Scientific Journal Video about Assay Development for High Content Quantification of Sod1 Mutant Protein Aggregate Formation in Living Cells at JoVE.com

Assay Development for High Content Quantification of Sod1 Mutant Protein Aggregate Formation in Living Cells

We describe a method to quantify the aggregation of misfolded proteins. Our protocol details lentiviral induced stable cell line generation, automated confocal imaging, and image analysis of protein aggregates. As an illustrative application, we studied the effect of small molecules in promoting SOD1 aggregation in a time- and dose-dependent manner.

Amyotrophic lateral sclerosis (ALS) is a fatal neurodegenerative disease that can be caused by inherited mutations in the gene encoding copper-zinc ...

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