Name: transient expression of foreign genes in insect cells (sf9) for protein functional assay
Uploaded: 2018-02-22T13:00:00
Description: Watch this Scientific Journal Video about Transient Expression of Foreign Genes in Insect Cells sf9 for Protein Functional Assay at JoVE.com

博士建宏ルー 3 プラスミドの構造を提供する国立台湾海洋大学海洋生物研究所に感謝いたします。この研究によってグラント 106-2311-B-197-001 - 科学省から技術 (ほとんど) に対応しました。

1. 準備
<ol><li>昆虫の細胞培養<ol>
<li>細胞培養液の 50 mL を準備します。この操作を行うには、抗生物質の 500 μ L を追加 (アムホテリシン B = 0.25 μ g/mL、ペニシリン 100 単位/mL、ストレプトマイシンを = = 100 μ g/mL) と熱不活化の牛胎児血清 (FBS または抗生物質) なし無血清培の 5 mL。 注:使用する前に水のお風呂に 30 分の 65 ° c ウシ胎児血清を加熱します。</li>
		<li>ハスモンヨ?...

<ol>
	<li>Miller, L. K. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Baculoviruses+as+gene+expression+vectors.">Baculoviruses as gene expression vectors.</a> Annual Reviews in Microbiology. 42 (1), 177-199 (1988).</li><li>Theilmann, D. A., Fauquet, C. M., Mayo, M. A., Maniloff, J., Desselberger, U., Ball, L. A., 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=Family+Baculoviridae.">Family Baculoviridae.</a> Virus Taxonomy: Eighth Report of the International Committee on Taxonomy of Viruses. , 1129-1185 (2005).</li><li>Nai, Y. S., Huang, Y. F., Chen, T. H., Chiu, K. P., Wang, C. H., Shields, V. D. C. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Determination+of+nucleopolyhedrovirus'+taxonomic+position.">Determination of nucleopolyhedrovirus' taxonomic position.</a> Biological Control of Pest and Vector Insects. , 169-200 (2017).</li><li>Friesen, P. D., Miller, L. K. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Regulation+of+baculovirus+early+gene+expression.">Regulation of baculovirus early gene expression.</a> The Baculoviruses. , 141-170 (1997).</li><li>Smith, G. E., Summers, M., Fraser, M. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Production+of+human+beta+interferon+in+insect+cells+infected+with+a+baculovirus+expression+vector.">Production of human beta interferon in insect cells infected with a baculovirus expression vector.</a> Mol. Cell. Biol. 3 (12), 2156-2165 (1983).</li><li>Luckow, V. A., Summers, M. D. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Trends+in+the+development+of+baculovirus+expression+vectors.">Trends in the development of baculovirus expression vectors.</a> Nature Biotechnol. 6 (1), 47-55 (1988).</li><li>Jarvis, D. L., Finn, E. E. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Modifying+the+insect+cell+N-glycosylation+pathway+with+immediate+early+baculovirus+expression+vectors.">Modifying the insect cell N-glycosylation pathway with immediate early baculovirus expression vectors.</a> Nature Biotechnol. 14 (1996), 1288-1292 (1996).</li><li>Clem, R. J., Miller, L. K. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Control+of+programmed+cell+death+by+the+baculovirus+genes+p35+and+iap.">Control of programmed cell death by the baculovirus genes p35 and iap.</a> Mol. Cell. Biol. 14, 5212-5222 (1994).</li><li>Leu, J. H., Kuo, Y. C., Kou, G. H., Lo, C. F. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Molecular+cloning+and+characterization+of+an+inhibitor+of+apoptosis+protein+(IAP)+from+the+tiger+shrimp,+Penaeus+monodon.">Molecular cloning and characterization of an inhibitor of apoptosis protein (IAP) from the tiger shrimp, Penaeus monodon.</a> Dev. Comp. Immunol. 32, 121-133 (2008).</li><li>Zhao, Y. G., Eggleston, P. E. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Comparative+analysis+of+promoters+for+transient+gene+expression+in+cultured+mosquito+cells.">Comparative analysis of promoters for transient gene expression in cultured mosquito cells.</a> Insect Mol. Biol. 8 (1), 31-38 (1999).</li><li>Nai, Y. S., Yang, Y. T., Kim, J. S., Wu, C. Y., Chen, Y. W., Wang, C. H. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Baculoviral+IAP2+and+IAP3+encoded+by+Lymantria+xylina+multiple+nucleopolyhedrovirus+(LyxyMNPV)+suppress+insect+cell+apoptosis+in+a+transient+expression+assay.">Baculoviral IAP2 and IAP3 encoded by Lymantria xylina multiple nucleopolyhedrovirus (LyxyMNPV) suppress insect cell apoptosis in a transient expression assay.</a> Appl. Entomol. Zool. 51, 305-316 (2016).</li><li>Eslami, A., Lujan, J. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Western+Blotting:+Sample+Preparation+to+Detection.">Western Blotting: Sample Preparation to Detection.</a> J. Vis. Exp. (44), e2359 (2010).</li><li>. Basic Methods in Cellular and Molecular Biology. Separating Protein with SDS-PAGE Available from: <a target="_blank" href="https://www.jove.com/science-education/5058/separating-protein-with-sds-page">https://www.jove.com/science-education/5058/separating-protein-with-sds-page</a> (2017)</li><li>Vucic, D., Kaiser, W. J., Harvey, A. J., Miller, L. K. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Inhibition+of+reaper-induced+apoptosis+by+interaction+with+inhibitor+of+apoptosis+proteins+(IAPs).">Inhibition of reaper-induced apoptosis by interaction with inhibitor of apoptosis proteins (IAPs).</a> Proc. Natl. Acad. Sci. USA. 94, 10183-10188 (1997).</li></ol>

熱ショックを利用した pDHsp/V5-彼/sf9 細胞システムの概念は、最初 1994年8クレムらによって記述されていた。Baculoviral 遺伝子プロモーター (IE1) とショウジョウバエ hsp70の比較を示したそのhsp70蚊細胞10でより高い効率を持っていた。さらに、正確に熱ショック処理後、熱ショック誘導によるタンパク質発現のタイミングを制御でき?...

2 つの蛋白質の表現システムは、タンパク質を生成するためよく使用されている: 原核生物の蛋白質の表現システム (大腸菌発現系) と真核生物の蛋白質の表現システム。1 つの人気のある真核生物のタンパク質発現系は、バキュロ ウイルス発現ベクター システム (BEVS)1です。バキュロ最初農業の世界の生物的制御因子として使用された森林害虫と。最後の数十年で、バキュロ蛋白質発現ベクターと同様にバイオ テクノロジーのツールとして開発されました。バキュロのゲノムは二本鎖の環状 DNA とエンベロープのヌクレオカプシド2から成っています。までに、七十八バキュロ ウイルスより分離シーケンス3をされています。宿主昆虫細胞における baculoviral 遺伝子発現の時空間のカスケードを基に、遺伝子の転写が即時初期遅延初期、後期、および非常に遅い遺伝子4を含む 4 つの一時的なカスケードに分類できた。
BEVSs は、非常に遅い遺伝子プロモーター (すなわち、多面体または p10 プロモーター) ドライブ ターゲット遺伝子の組換えバキュロ ウイルスの相同組換えによって生成されたときに使用されたので、示されました。組換えバキュロ ウイルス昆虫細胞の異種蛋白の発現は哺乳類 (糖タンパク質生産に適しています) ポスト翻訳の修正蛋白質のそれに似ています。したがって、バキュロは広く使用されている5,6,7をされています。ただし、制限が 1 つ異なる昆虫細胞7N グリコシル化反応経路の存在であります。
したがって、新しいバキュロ ウイルス発現系、一過的遺伝子発現系が開発されました。このシステムは、昆虫細胞での baculoviral 即時初期プロモーター (すなわち 1プロモーター) のドライブの下で外来遺伝子を表現します。このシステムを使用して、ターゲット蛋白質すぐに表現できますすなわち 1プロモーターの制御下で良い N 型糖鎖7昆虫細胞で N グリコシル化反応経路を変更中。また、baculoviral 即時初期遺伝子は宿主細胞の RNA ポリメラーゼ II による転写は、活性化4の任意のウイルスの要因を必要としません。そのため、短い時間内の昆虫細胞で外国蛋白質を表現できます。までに、非定常遺伝子発現システムは細胞培養システム培養バキュロ ウイルスの蛋白質機能の試金を実行するための最も重要な技術の一つです。システムは、バキュロ ウイルスまたは外国蛋白質の機能を解析に適用できます。市販の一過的遺伝子発現系の 1 つは、ヒメシロモンドクガ pseudotsugata multicapsid 核 (OpMNPV) (OpIE2 と OpIE1 プロモーター) の即時初期遺伝子 (IE) プロモーターに基づいています。
ただし、昆虫細胞における外来性遺伝子の低い発現レベル頃まだ問題オピー プロモーターを用いた一過的遺伝子発現系に使用される8,9,10。したがって、別の一過的遺伝子発現系では、ショウジョウバエ熱衝撃蛋白質 70 (hsp70) 遺伝子8,9のプロモーターに基づいてを構築されました。Hsp70 のプロモーターは IE baculoviral プロモーター昆虫細胞10熱ショックによる場合よりも効率的に動作します。このシステムでターゲット遺伝子はショウジョウバエ熱ショック 70 (Dhsp70) プロモーターのドライブの下で表現されました。外来遺伝子を PCR クローニング法による一過的遺伝子発現プラスミドに簡単に複製することができます。さらに、熱衝撃誘導による遺伝子発現のタイミングの制御を実行できます。
本報告では、我々 のアプローチに従うし、熱ショックによる一時的なタンパク質発現系を用いた baculoviral 遺伝子 (3 アポトーシスの阻害剤強 xylina MNPV からiap3 ) の 3 つの異なる切り捨てを表現し、さらに抗アポトーシス活性の解析にこれらの表現された蛋白質を適用します。このシステムは外国蛋白質を即座に表現することができますいずれかまたは他のタンパク質の活性測定法に適用する可能性もしながら sf9 細胞におけるタンパク質抗アポトーシス活性の評価に適用可能します。

<table>
	<tbody>
		<tr>
			<td>Antibiotic-Antimycotic, 100X</td>
			<td>Gibco</td>
			<td>15240-062</td>
			<td>for insect cell culture</td>
		</tr>
		<tr>
			<td>Certified Foetal Bovine Serum</td>
			<td>Bioind</td>
			<td>04-001-1A</td>
			<td></td>
		</tr>
		<tr>
			<td>Sf-900 II SFM</td>
			<td>Thermo Fisher</td>
			<td>10902096</td>
			<td>serum-free cell culture medium</td>
		</tr>
		<tr>
			<td>Sf9 cells</td>
			<td>ATCC</td>
			<td>CRL-1711</td>
			<td></td>
		</tr>
		<tr>
			<td>25cm2 cell culture flask</td>
			<td>Nunc, Thermo Fisher</td>
			<td>156340</td>
			<td></td>
		</tr>
		<tr>
			<td>Inverted light microscopy</td>
			<td>WHITED</td>
			<td>WHITED WI-400</td>
			<td></td>
		</tr>
		<tr>
			<td>RBC HIT Competent Cell</td>
			<td>Bioman</td>
			<td>RH618-J80</td>
			<td>Escherichia coli (DH5&#945;)</td>
		</tr>
		<tr>
			<td>L.B. Broth (Miller)</td>
			<td>Bioman</td>
			<td>LBL407</td>
			<td></td>
		</tr>
		<tr>
			<td>Agar, Bacteriological Grade</td>
			<td>Bioman</td>
			<td>AGR001</td>
			<td></td>
		</tr>
		<tr>
			<td>Zeocin</td>
			<td>Invitrogen</td>
			<td>ant-zn-1</td>
			<td>selection antibiotic</td>
		</tr>
		<tr>
			<td>PCR Master Mix (2X)</td>
			<td>ThermoFisher</td>
			<td>K0171</td>
			<td></td>
		</tr>
		<tr>
			<td>Geneaid Midi Plasmid Kit (Endotoxin Free)</td>
			<td>Geneaid</td>
			<td>PIE25</td>
			<td></td>
		</tr>
		<tr>
			<td>Actinomycin D</td>
			<td>SIGMA</td>
			<td>A9415</td>
			<td></td>
		</tr>
		<tr>
			<td>Corning 50 mL centrifuge tubes</td>
			<td>SIGMA</td>
			<td>CLS430829-500EA</td>
			<td>50 mL tubes</td>
		</tr>
		<tr>
			<td>Hemocytometer</td>
			<td>Gizmo Supply Co</td>
			<td>B-CNT-SLDE-V2</td>
			<td></td>
		</tr>
		<tr>
			<td>24-Well Multidish</td>
			<td>Nunc, Thermo Fisher</td>
			<td>142475</td>
			<td>24-well plate</td>
		</tr>
		<tr>
			<td>Cellfectin II Reagent</td>
			<td>Thermo Fisher</td>
			<td>10362100</td>
			<td>cell transfectin reagent</td>
		</tr>
		<tr>
			<td>PBS-Phosphate-Buffered Saline (10X) pH 7.4</td>
			<td>Thermo Fisher</td>
			<td>AM9624</td>
			<td></td>
		</tr>
		<tr>
			<td>4&#215;SDS Loading Dye</td>
			<td>Bioman</td>
			<td>P1001</td>
			<td></td>
		</tr>
		<tr>
			<td>Immobilon-P (PVDF Blotting Membranes)</td>
			<td>Merck Milipore</td>
			<td>IPVH00010</td>
			<td>PVDF membranes</td>
		</tr>
		<tr>
			<td>Mini Trans-Blot Cell system</td>
			<td>BIO-RED</td>
			<td>1703930</td>
			<td>Blotting device</td>
		</tr>
		<tr>
			<td>Ponceau S solution</td>
			<td>SIGMA</td>
			<td>6226-79-5</td>
			<td></td>
		</tr>
		<tr>
			<td>Anti-V5</td>
			<td>SIGMA</td>
			<td>V8137</td>
			<td>rabbit anti-V5 antibody</td>
		</tr>
		<tr>
			<td>Goat anti-rabbit IgG-horseradish peroxidase (HRP)</td>
			<td>Jackson</td>
			<td>111-035-003</td>
			<td></td>
		</tr>
		<tr>
			<td>Tween 20</td>
			<td>Merck</td>
			<td>817072</td>
			<td></td>
		</tr>
		<tr>
			<td>6-Well Multidish</td>
			<td>Nunc, Thermo Fisher</td>
			<td>145380</td>
			<td></td>
		</tr>
		<tr>
			<td>0.4 % trypan blue solution</td>
			<td>AMRESCO</td>
			<td>K940-100ML</td>
			<td></td>
		</tr>
		<tr>
			<td>P10 pipetman</td>
			<td>Gilson</td>
			<td>F144802</td>
			<td></td>
		</tr>
		<tr>
			<td>P1000 pipetman</td>
			<td>Gilson</td>
			<td>F123602</td>
			<td></td>
		</tr>
		<tr>
			<td>Tape</td>
			<td>Symbio</td>
			<td>PPS7</td>
			<td>24 well tape ( 19 mm&#215;36 M)</td>
		</tr>
	</tbody>
</table>

transient expression of foreign genes in insect cells (sf9) for protein functional assay

一過的遺伝子発現系は、細胞培養システム培養バキュロ ウイルスのタンパク質機能解析を実行するための最も重要な技術の一つです。このシステムは、エクスプレス遺伝子一過性発現プラスミドの baculoviral プロモーターの制御下に開発されました。さらに、このシステムは、バキュロ ウイルス自体または外国蛋白質の機能アッセイに適用できます。最も広く、商業的に利用可能な一過的遺伝子発現系は、ヒメシロモンドクガ pseudotsugata multicapsid 核 (OpMNPV) の即時初期遺伝子 (IE) プロモーターに基づいて開発です。ただし、昆虫細胞における外来性遺伝子の低い発現レベルが認められました。したがって、一過的遺伝子発現系が蛋白質の表現を改善するため建設されました。このシステムは、組換えのプラスミッドはショウジョウバエ熱ショック 70 (Dhsp70) プロモーターの制御の下でターゲット シーケンスを格納する建設されました。このプロトコルはこの熱ショック ベース pDHsp/V5 渓 (6 ヒスチジンと V5 epitope) のアプリケーションを提示/ハスモンヨトウ frugiperdaセル (sf9 細胞) システム;このシステムも候補タンパク質を昆虫細胞での抗アポトーシス活性を評価するための遺伝子発現だけでなく、利用可能なです。さらに、このシステムは、組換えプラスミドの 1 つをどちらか導入することができます。 または昆虫細胞の 2 つの潜在的機能的拮抗組換えのプラスミッドを co transfected。プロトコルはこのシステムの効率性を示しますこのテクニックの実践事例を提供しています。

フルの長さと他 2 つ切り捨て (BIR とリング ドメイン) LyxyMNPV から Ly IAP3 のしたで過剰に発現 sf9 細胞、熱衝撃による pDHsp/V5-彼に基づく/ハスモンヨトウ frugiperdaセル (sf9 細胞) システム。PDHsp/V5-彼含まれているショウジョウバエ熱ショック蛋白質プロモーターで、42 ° C 状態の温度で細胞の転写因子と翻訳システム (図 1)8...

Watch this Scientific Journal Video about Transient Expression of Foreign Genes in Insect Cells sf9 for Protein Functional Assay at JoVE.com

Transient Expression of Foreign Genes in Insect Cells sf9 for Protein Functional Assay

このプロトコルを記述する外国蛋白質を表現するまたは潜在的な外国蛋白質とその切り捨てられたのアミノ酸の抗アポトーシス活性を評価に使用することができます熱衝撃によるタンパク質発現システム (pDHsp/V5-彼/sf9 細胞システム)昆虫細胞での酸。

昆虫細胞 (sf9) 蛋白質機能の試金のための外国遺伝子の一過性発現

The transient gene expression system is one of the most important technologies for performing protein functional analysis in the baculovirus in vitro cell ...

The overall goal of this heat shock-induced protein expression system is to evaluate protein anti-apoptotic activity in two potentially functionally antagonistic proteins in insect cells. This method can help answer key questions about the functions and activities of candidate proteins in biotechnology and proteomics, such as their anti-apoptotic activities and protein interactions. The main advantage of this technique is that the timing of gene expression is controlled by heat shock induction.So this method can provide insight into protein functional status. It can also be applied to other systems, such as mammalian protein expression. The Spodoptera frugiperda, or Sf9, insect cells used in this protocol are grown in cell culture medium in 25 square centimeter cell culture flasks at 28 degrees Celsius.Shake the cell culture flask to detach the cells from the flask. Then check under a light microscope to make sure that about 80%of the cells are detached. Transfer 50%of the cell suspension to a new 25 square centimeter cell culture flask, and allow the cells to attach at room temperature for 15 minutes.After 15 minutes, replace the medium with five milliliters of fresh culture medium, and grow in an incubator at 28 degrees Celsius. Depending on the cell growth, passage the cells every two to three days. Prior to harvesting the Sf9 cells, it is important to check the cells under the light microscope to make sure that there is no contamination by bacteria or other microorganisms.To harvest the Sf9 cells, shake the culture flask to detach the cells, and then transfer the cell suspension to a 15-milliliter tube. Using a P10 pipette, transfer 10 microliters of the cell suspension to a hemacytometer, and count the cell number under the light microscope. Plate three times 10 to the fifth cells into each well of a 24-well plate, and leave at room temperature for 15 minutes.After 15 minutes, replace the medium with 0.5 milliliters of plating medium. Prepare the cell transfection regent. For each transfection, dilute eight microliters of cell transfection reagent with 100 microliters of serum-free cell culture medium, and vortex for one second to mix.In this study, three different truncations of the baculoviral gene, inhibitor of apoptosis 3, or IAP3, will be expressed under the control of the Drosophila heat shock 70 promoter, the full-length IAP3, a truncation lacking the RING domain, and a truncation lacking the BIR domain. Add two micrograms of each plasmid DNA into 100 microliters of serum-free cell culture medium, and mix by vortexing for one second. Prepare a positive control as well.Combine the diluted plasmid DNA and diluted cell transfection reagent, and mix by vortexing. Incubate at room temperature for 30 minutes. Using a P1000 pipette, add 210 microliters of each DNA transfection reagent mixture dropwise onto the cells.Incubate at 28 degrees Celsius for five hours. After five hours, replace the plating medium with 0.5 milliliters of cell culture medium, and then seal the 24-well plate with tape. Incubate at 28 degrees.On the following day, heat shock to induce protein expression by floating the plate in a 42 degree Celsius water bath for 30 minutes. After 30 minutes, return the 24-well plate to the 28 degree Celsius incubator. Protein expression is subsequently confirmed by Western blot as described in the text protocol.To examine gene-induced cell apoptosis, first prepare Sf9 cells as demonstrated earlier. Next, transfect the cells in the same manner as before, but include one microgram of a plasmid containing an apoptosis inducer gene in each transfection reaction. Incubate at 28 degrees Celsius for five hours, replace the medium, and incubate for 16 hours.Heat shock the transfected cells at 42 degrees Celsius for 30 minutes. Incubate the cells at 28 degrees Celsius for five hours before conducting the cell viability assay. For chemical-induced cell apoptosis, plate one times 10 to the six Sf9 cells into each well of a six-well plate.Leave at room temperature for 15 minutes, and then replace the medium with one milliliter of plating medium. Transfect the cells with four micrograms of each plasmid DNA. After five hours, replace the plating medium with one milliliter of cell culture medium, and incubate the cells at 28 degrees Celsius for 16 hours.Then heat shock at 42 degrees Celsius for 30 minutes. Incubate the cells at 28 degrees Celsius for five hours post-heat shock. Then treat the transfected cells with actinomycin D to induce apoptosis.Incubate at 28 degrees Celsius for 16 hours before conducting the cell viability assay. Begin this procedure by washing the treated cells. Remove the medium from each well, add one milliliter of PBS, and leave for one minute.Wash the cells three times with PBS in this manner. Resuspend the cells in each well with one milliliter of PBS containing 04%trypan blue, and stain at room temperature for three minutes. Transfer the cell suspension into a 1.5 milliliter microfuge tube.Transfer 10 microliters of the trypan blue-stained cell suspension to a hemacytometer, and count the viable intact cells under a light microscope. Finally, perform statistical analysis as described in the text protocol. The full length and two truncations of IAP3 from Lymantria xylina MNPV were overexpressed in Sf9 cells, and Western blot was performed on cell lysates to confirm protein expression.The anti-apoptotic protein Ac-P35 was included as a positive control. All proteins could be detected in transfected cells at either one hour or five hours post-heat shock, with a higher expression at five hours. This system can be adapted to evaluate anti-apoptotic activity.For gene-induced cell apoptosis, the apoptosis inducer Drosophila Reaper was co-transfected with target gene plasmid constructs into Sf9 cells, which were subsequently heat shocked to activate gene expression. Compared to the vector Drosophila Reaper, the positive control showed high anti-apoptotic activity, reaching up to 80%of the viability rate. The other constructs showed various effects on anti-apoptotic activity.For chemical-induced cell apoptosis, only one construct was transfected into Sf9 cells, and actinomycin D was added five hours post-heat shock. Compared to the positive control or the negative control, the other constructs showed various effects on anti-apoptotic activity. Once mastered, this technique can be done in two to three days if it is performed properly.While attempting this procedure, it's important to remember to obey the operation rules of cell culture in laminar flow and check the status of cells diligently. Following this procedure, other methods, such as co-immunoprecipitation, can be performed to answer additional questions, like whether there is any interaction between the two proteins co-expressed in the insect cells. After its development, this technique paved the way for researchers in the field of biotechnology to explore protein functions in animal or microorganisms.After watching this video, you should have a good understanding of how to use this system to express foreign protein or evaluate potentially functionally antagonistic proteins in insect cells. Don't forget that working with some chemicals, like actinomycin D, can be extremely hazardous, and precautions, such as wearing gloves, should always be taken while performing this procedure.

Research

JoVE Journal

Genetics

Transient Expression of Foreign Genes in Insect Cells (sf9) for Protein Functional Assay

Controllable Ion Channel Expression through Inducible Transient Transfection

誘導性一過性トランスフェクションを介して制御可能なイオンチャネルの発現

Transfection, the delivery of foreign nucleic acids into a cell, is a powerful tool in protein research. Through this method, ion channels can be ...

In Vitro Bioluminescence Assay to Characterize Circadian Rhythm in Mammary Epithelial Cells

In Vitro Bioluminescence Assay to Characterize Circadian Rhythm in Mammary Epithelial Cells

体外乳腺上皮細胞の概日リズムを特徴付ける生物発光アッセイ

The circadian rhythm is a fundamental physiological process present in all organisms that regulates biological processes ranging from gene expression to ...

Determination of the Optimal Chromosomal Location(s) for a DNA Element in Escherichia coli Using a Novel Transposon-mediated Approach

Determination of the Optimal Chromosomal Locations for a DNA Element in Escherichia coli Using a Novel Transposon-mediated Approach

新規トランスポゾンを介したアプローチを使用してエシェリヒア属大腸菌DNA 要素の最適な染色体の場所の決定

The optimal chromosomal position(s) of a given DNA element was/were determined by transposon-mediated random insertion followed by fitness selection. In ...

Maintaining Biological Cultures and Measuring Gene Expression in Aphis nerii: A Non-model System for Plant-insect Interactions

Maintaining Biological Cultures and Measuring Gene Expression in Aphis nerii: A Non-model System for Plant-insect Interactions

生物学的文化とワタアブラムシ neriiの遺伝子発現を測定を維持する: 植物・昆虫間の相互作用の非モデル系

Aphids are excellent experimental models for a variety of biological questions ranging from the evolution of symbioses and the development of polyphenisms ...

Endogenous Protein Tagging in Human Induced Pluripotent Stem Cells Using CRISPR/Cas9

人間でタグ内因性のタンパク質誘導多能性幹細胞 CRISPR/Cas9 を使用して

A protocol is presented for generating human induced pluripotent stem cells (hiPSCs) that express endogenous proteins fused to in-frame&#160;N- or ...

Reverse Transcription-Loop-mediated Isothermal Amplification (RT-LAMP) Assay for Zika Virus and Housekeeping Genes in Urine, Serum, and Mosquito Samples

Reverse Transcription-Loop-mediated Isothermal Amplification RT-LAMP Assay for Zika Virus and Housekeeping Genes in Urine, Serum, and Mosquito Samples

逆にジカと尿、血清、蚊のサンプルでハウスキーピング遺伝子の転写-ループ - Lamp 法 (RT ランプ) アッセイ

Infection with Zika virus (ZIKV) can be asymptomatic in adults, however, infection during pregnancy can lead to miscarriage and severe neurological birth ...

Identification of Homologous Recombination Events in Mouse Embryonic Stem Cells Using Southern Blotting and Polymerase Chain Reaction

南しみが付くことおよびポリメラーゼの連鎖反応を使用してマウス胚性幹細胞での相同組換えイベントの識別

Relative to the issues of off-target effects and the difficulty of inserting a long DNA fragment in the application of designer nucleases for genome ...

Determining the Egg Fertilization Rate of Bemisia tabaci Using a Cytogenetic Technique

Determining the Egg Fertilization Rate of Bemisia tabaci Using a Cytogenetic Technique

細胞遺伝学的手法を用いたタバココナジラミの卵の受精率を決定します。

A few species of sap-sucking whiteflies are some of the most damaging terrestrial pests worldwide because of the crop damage they inflict and plant ...

An Assay for Quantifying Protein-RNA Binding in Bacteria

細菌におけるタンパク質-RNA結合を定量するためのアッセイ

In the initiation step of protein translation, the ribosome binds to the initiation region of the mRNA. Translation initiation can be blocked by binding ...

An In Vitro Protocol for Evaluating MicroRNA Levels, Functions, and Associated Target Genes in Tumor Cells

腫瘍細胞におけるマイクロRNAレベル、機能、および関連する標的遺伝子を評価するためのインビトロプロトコル

MicroRNAs (miRNAs) are small regulatory RNAs which are recognized to modulate numerous intracellular signaling pathways in several diseases including ...