G-Actin/F-actin In Vivo Assay Biochem Kit

G-Actin/F-actin In Vivo Assay Biochem Kit
$0.00

Product Uses Include

  • To study the effects of pharmaceutical compounds on the ratio of G-actin to F-actin.
  • To study the effects of mutated cell lines versus their parent cell line for the change in ratio of G-actin to F-actin.
  • To study the effects of physical alterations of environment on the ratio of G-actin to F-actin. 

Introduction
The most reproducible and accurate method of determining the amount of filamentous actin (F-actin) content versus free globular-actin (G-actin) content in a cell population is to use Western blot quantitation of F-actin and G-actin cellular fractions (1-4).  The general approach is to homogenize cells in F-actin stabilization buffer, followed by centrifugation to separate the F-actin from G-actin pool. The fractions are then separated by SDS-PAGE and actin is quantitated by Western blot. The final result gives the most accurate method of determining the ratio of F-actin incorporated into the cytoskeleton versus the G-actin found in the cytosol. This kit contains all the reagents needed to perform this assay.

Kit contents
The kit contains sufficient materials for 30-100 assays depending assay setup and includes reagents for positive and negative controls. The following components are included:

  1. Lysis and F-actin stabilization buffer
  2. ATP (Cat. # BSA04)
  3. Protease inhibitor cocktail (Cat. # PIC02)
  4. F-actin enhancing control solution
  5. F-actin depolymerization control solution
  6. Control G-actin Standard (Cat. # AKL99)
  7. Anti-Actin MAb (clone 7A8.2.1) (Cat # AAN02-S)
  8. SDS sample buffer (5 x)
  9. DMSO
  10. Manual with detailed protocols and extensive troubleshooting guide 

Equipment needed

  1. Temperature controlled centrifuge capable of reaching 100,000 x g. Ideally accepts 100 µl sample volumes. The assay can be adapted for larger volumes, however, this may result in less assays per kit (see Section VI: Assay Protocol).
  2. Small homogenizer suitable for low milliliter volumes or 25G needle and syringe.
  3. SDS-PAGE and western blot apparatus and reagents, anti-mouse-HRP secondary Ab

Example results
Swiss 3T3 cells were grown to 50% confluency in DMEM / 10% FBS at 37°C/5% CO2.  Cells were untreated  (lanes 1P and 1S) or treated with 0.1 µM of the actin polymerizing drug jasplakinolide for 30 minutes at 37°C/5% CO2 (lanes 2P and 2S).  Cells were lysed and processed into supernatant (S) and pellet (P) fractions and ana-lysed by western blot quantitation of actin protein according to the G-actin/F-actin In Vivo Assay Kit instructions.

BK037_Figure_1

Panel 1: In untreated Swiss 3T3 cells, 45% of actin is soluble G-actin (1S) and 55% is insoluble F-actin (1P). This agrees with published data (3).Panel 2: In Swiss 3T3 cells treated with the actin polymerizing drug jasplakinolide, only 5% of actin remains in the soluble G-actin fraction (2S) while 95% is found in the insoluble F-actin pellet fraction (2P). Lanes 50, 20 and 10 represents 50ng, 20ng and 10 ng of G-actin standard. M represents molecular weight markers (molecular weights are shown to the right of the blot). 

References

  1. Milligan R.A. et al. 1990. Molecular structure of F-actin and location of surface binding sites. Nature 348, 217-221.
  2. Dos Remedios C.G. et al. 2003. Actin binding proteins: regulation of cytoskeletal microfilaments. Physiol. Rev. 83, 433-473.
  3. Phillips D.R. et al. 1980. Identification of membrane proteins mediating the interaction of human platelets. J. Cell Biol. 86, 77-86.
  4. Kim H.R. et al. 2008. Cytoskeletal remodeling in differentiated vascular smooth muscle is actin isoform dependent and stimulus dependent. Am. J. Physiol. Cell Physiol. 295, C768-C778.

For product Datasheets and MSDSs please click on the PDF links below.   For additional information, click on the FAQs tab above or contact our Technical Support department at tservice@cytoskeleton.com

AuthorTitleJournalYearArticle Link
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Müller, Lisa et al.Plakophilin 4 controls the spatio-temporal activity of RhoA at adherens junctions to promote cortical actin ring formation and tissue tensionCellular and Molecular Life Sciences2024
Liu, Xiaomin et al.RABV induces biphasic actin cytoskeletal rearrangement through Rac1 activity modulationJournal of Virology2024
Wang, Kui et al.Vascular endothelial cellular mechanics under hyperglycemia and its role in tissue regenerationRegenerative Biomaterials2024
Sen, Buer et al.Nuclear actin structure regulates chromatin accessibilityNature Communications2024
Baudouin, Lucas et al.Antagonistic actions of PAK1 and NF2/Merlin drive myelin membrane expansion in oligodendrocytesGLIA2024
Gao, Da Peng et al.Chronic Alcohol Exposure Alters the Levels and Assembly of the Actin Cytoskeleton and Microtubules in the Adult Mouse HippocampusJournal of Integrative Neuroscience2024
Kamnev, Anton et al.Coordinated ARP2/3 and glycolytic activities regulate the morphological and functional fitness of human CD8+ T cellsCell reports2024
Yin, Xiufeng et al.CFL1 is Implicated in Chronic Myeloid Leukemia Response during Imatinib TherapyJournal of Cancer2024
Medina-Dols, Aina et al.Role of PATJ in stroke prognosis by modulating endothelial to mesenchymal transition through the Hippo/Notch/PI3K axisCell Death Discovery 2024
Li, Yuan Bao et al.Fimbrin associated with Pmk1 to regulate the actin assembly during Magnaporthe oryzae hyphal growth and infectionStress Biology2024
Wang, Lingling et al.Map-1a regulates Sertoli cell BTB dynamics through the cytoskeletal organization of microtubule and F-actinReproductive Biology and Endocrinology 2024
Yu, Jinhan et al.Inhibiting F-Actin Polymerization Impairs the Internalization of Moraxella catarrhalisMicroorganisms 2024
Kinnart, Inge et al.Elevated α-synuclein levels inhibit mitophagic fluxnpj Parkinson's Disease2024
Qu, Jiaorong et al.The tumor-enriched small molecule gambogic amide suppresses glioma by targeting WDR1-dependent cytoskeleton remodelingSignal Transduction and Targeted Therapy2023
Li Mow Chee, Frederic et al.Mena regulates nesprin-2 to control actin–nuclear lamina associations, trans-nuclear membrane signalling and gene expressionNature Communications2023
Djaziri, Nabila et al.Cleavage of periostin by MMP9 protects mice from kidney cystic diseasePLOS ONE2023
Hsu, Hong Ming et al.Distinct features of the host-parasite interactions between nonadherent and adherent Trichomonas vaginalis isolatesPLOS Neglected Tropical Diseases2023
Chen, Yen Ju et al.PIP2 regulating calcium signal modulates actin cytoskeleton-dependent cytoadherence and cytolytic capacity in the protozoan parasite Trichomonas vaginalisPLOS Pathogens2023
Wang, Kai-Hsuan et al.An Atypical F-Actin Capping Protein Modulates Cytoskeleton Behaviors Crucial for Trichomonas vaginalis ColonizationMicrobiology Spectrum2023
Xu, Xun et al.Histone Modification of Osteogenesis Related Genes Triggered by Substrate Topography Promotes Human Mesenchymal Stem Cell DifferentiationACS Applied Materials and Interfaces2023
Kneppers, Anita et al.AMPKα2 is a skeletal muscle stem cell intrinsic regulator of myonuclear accretioniScience2023
Chen, Wei Ju et al.Podocalyxin-Like Protein 1 Regulates Pluripotency through the Cholesterol Biosynthesis PathwayAdvanced Science2023
Nguyen, Abraham et al.TTBK2 controls cilium stability by regulating distinct modules of centrosomal proteinsMolecular Biology of the Cell2023
Hijazi, Nour et al.Paxillin regulates liver fibrosis via actin polymerization and ERK activation in hepatic stellate cellsJournal of Cell Science2023
Li, Zixin et al.Self-promoted electroactive biomimetic mineralized scaffolds for bacteria-infected bone regenerationNature Communications 2023
Makarova, Nadezda et al.Mechanical Way To Study Molecular Structure of Pericellular LayerACS Applied Materials and Interfaces2023
Guan, Linbo et al.Lymphangiogenic responses of lymphatic endothelial cells to steady direct-current electric fieldsCell Adhesion & Migration2023
Polino, Alexander J. et al.Disrupting actin filaments enhances glucose-stimulated insulin secretion independent of the cortical actin cytoskeletonJournal of Biological Chemistry2023
Rakotomamonjy, Jennifer et al.PCDH12 loss results in premature neuronal differentiation and impeded migration in a cortical organoid modelCell reports2023
Du, William W. et al.Nuclear Actin Polymerization Regulates Cell Epithelial-Mesenchymal TransitionAdvanced Science2023
Levy-Myers, Reuben et al.An independent regulator of global release pathways in astrocytes generates a subtype of extracellular vesicles required for postsynaptic functionScience Advances2023
St. Paul, Amanda et al.FXR1 regulates vascular smooth muscle cell cytoskeleton, VSMC contractility, and blood pressure by multiple mechanismsCell reports2023
Wu, Qiaoyun et al.Electroacupuncture inhibits dendritic spine remodeling through the srGAP3-Rac1 signaling pathway in rats with SNLBiological Research2023
Talukdar, Sattya N. et al.RSV-induced expanded ciliated cells contribute to bronchial wall thickeningVirus Research2023
Wang, Caiqin et al.Induction of filopodia formation by α-Actinin-2 via RelA with a feedforward activation loop promoting overt bone marrow metastasis of gastric cancerJournal of Translational Medicine2023
Correa, Francisco et al.Actin-Cytoskeleton Drives Caveolae Signaling to Mitochondria during PostconditioningCells2023
Romero, Luis O. et al.Linoleic acid improves PIEZO2 dysfunction in a mouse model of Angelman SyndromeNature Communications2023
Bogucka-Janczi, Katarzyna et al.ERK3/MAPK6 dictates CDC42/RAC1 activity and ARP2/3-dependent actin polymerization.eLife2023
Li, Linxi et al.PCP Protein Inversin Regulates Testis Function Through Changes in Cytoskeletal Organization of Actin and MicrotubulesEndocrinology2022
Si, Hongjiang et al.A Highlights from MBoC Selection: Noncanonical Wnt/Ror2 signaling regulates cell–matrix adhesion to prompt directional tumor cell invasion in breast cancerMolecular Biology of the Cell2022
Flores-Muñoz, Carolina et al.The Long-Term Pannexin 1 Ablation Produces Structural and Functional Modifications in Hippocampal NeuronsCells2022
Lohraseb, Iman et al.Global ubiquitinome profiling identifies NEDD4 as a regulator of Profilin 1 and actin remodelling in neural crest cellsNature Communications2022
Fang, Shi et al.RhoBTB1 reverses established arterial stiffness in angiotensin II–induced hypertension by promoting actin depolymerizationJCI Insight2022
Abe, Ichitaro et al.Disruption of actin dynamics regulated by Rho effector mDia1 attenuates pressure overload-induced cardiac hypertrophic responses and exacerbates dysfunctionCardiovascular Research2021
Lin, Yu Sheng et al.Sarcomeres morphology and Z-line arrangement disarray induced by ventricular premature contractions through the Rac2/cofilin pathwayInternational Journal of Molecular Sciences2021
Garcia, Alix et al.miR-204-5p and Platelet Function Regulation: Insight into a Mechanism Mediated by CDC42 and GPIIbIIIaThrombosis and haemostasis2021
Misra, Suniti et al.Periostin/Filamin-A: A Candidate Central Regulatory Axis for Valve Fibrogenesis and Matrix CompactionFrontiers in Cell and Developmental Biology2021
Saal, Kim Ann et al.Rho-kinase inhibition by fasudil modulates pre-synaptic vesicle dynamicsJournal of Neurochemistry2021
Balbi, Carolina et al.An exosomal-carried short periostin isoform induces cardiomyocyte proliferationTheranostics2021
Zhang, Chong et al.Fibrinogen/AKT/Microfilament Axis Promotes Colitis by Enhancing Vascular PermeabilityCellular and molecular gastroenterology and hepatology2021
Gupta, Richa et al.Ectopic expression of 35 kDa and knocking down of 78 kDa SG2NAs induce cytoskeletal reorganization, alter membrane sialylation, and modulate the markers of EMTMolecular and cellular biochemistry2021
Kim, Ji Eun et al.PLPP/CIN-mediated NF2-serine 10 dephosphorylation regulates F-actin stability and Mdm2 degradation in an activity-dependent mannerCell Death and Disease2021
Landry, Natalie M. et al.SKI activates the Hippo pathway via LIMD1 to inhibit cardiac fibroblast activationBasic Research in Cardiology2021
Morandell, Jasmin et al.Cul3 regulates cytoskeleton protein homeostasis and cell migration during a critical window of brain developmentNature Communications2021
Yang, Nuo et al.Effects of dexamethasone on remodeling of the hippocampal synaptic filamentous actin cytoskeleton in a model of pilocarpine-induced status epilepticusInternational Journal of Medical Sciences2020
Lu, Yi Ju et al.Arabidopsis calcium-dependent protein kinase 3 regulates actin cytoskeleton organization and immunityNature Communications2020
Chen, Yuewen et al.Coronin 2B regulates dendrite outgrowth by modulating actin dynamicsFEBS Letters2020
Huang, Rui et al.NCAM regulates temporal specification of neural progenitor cells via profilin2 during corticogenesisJournal of Cell Biology2020
Shi, Zengdun et al.Myocardin and myocardin-related transcription factor-A synergistically mediate actin cytoskeletal-dependent inhibition of liver fibrogenesisAmerican Journal of Physiology - Gastrointestinal and Liver Physiology2020
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Yu, Minhao et al.Increased proton-sensing receptor GPR4 signalling promotes colorectal cancer progression by activating the hippo pathwayEBioMedicine2019
Kommaddi, Reddy Peera et al.Aβ mediates F-actin disassembly in dendritic spines leading to cognitive deficits in alzheimer’s diseaseJournal of Neuroscience2018
Wen, Qing et al.Actin nucleator Spire 1 is a regulator of ectoplasmic specialization in the testisCell Death and Disease2018
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Question 1:  At which step can the assay be stopped?

Answer 1:  The assay cannot be stopped until after the 100,000 x g spin for 1 hour at 37°C.  After this high speed centrifugation, the supernatant (G-actin) can be mixed with SDS loading buffer and frozen for later use.  The pellet (F-actin) should be resuspended with a depolymerizing agent and water and then mixed with SDS loading buffer and frozen for later use.  Upon freezing, F-actin depolymerizes, so it is necessary to separate the F-actin from the G-actin before freezing samples to isolate samples for an accurate measurement of F-actin and G-actin ratios.

 

Question 2:  How sensitive is this assay?

Answer 2:  The assay can detect as small as a 15% shift in G-actin to F-actin ratio.  Each condition should be performed in duplicate and repeated several times as assay reproducibility can vary by 10-20% between experiments.

 

Question 3: Will the kit work at slower centrifugation speeds such as 16,000 x g?

Answer 3: Unfortunately, no. In our testing centrifugation speeds slower than 100,000 x g, including up to 26,000 x g, failed to efficiently pellet F-actin. 

 

If you have any questions concerning this product, please contact our Technical Service department at tservice@cytoskeleton.com