User experience of SiR-Actin and SiR-Tubulin Live Cell Imaging

Very recently we launched new Live Cell Imaging tools: SiR-Actin and SiR-Tubulin, produced by Spirochrome.

These stains allow you to stain actin and tubulin in living cells without the need to transfect cells – as I described in my previous posts on these tools:

Today, I invite you to take a look at the brilliant results users of the stains have obtained. Some of them have already been published during the past months.

Most recent publications:

One of the most recent publications using SiR-Actin comes from the lab of the Nobel price winner Stefan W. Hell, who is one of the directors of the Max Planck Institute for Biophysical Chemistry in Göttingen, Germany:

STED Nanoscopy Reveals the Ubiquity of Subcortical Cytoskeleton Periodicity in Living Neurons, Elisa D’Este, Dirk Kamin, Fabian Göttfert, Ahmed El-Hady, and Stefan W. Hell, Cell Reports, 10, 8, 1246–1251 (2015)

By using STED (stimulated emission depletion) microscopy, Hell’s group could visualize the periodic subcortical actin structure in axons and dendrites in cultured hippocampal neurons. These results were obtained by staining Actin with SiR-Actin.

Another recent paper even brought an image of HEK293 cells co-expressing CaVβ and CaV1.2 L-type calcium channel and stained for actin filaments using SiR-Actin straight to the front cover of the respective JBC issue.

Direct Interaction of CaVβ with Actin Up-regulates L-type Calcium Currents in HL-1 Cardiomyocytes, Gabriel Stölting, Regina Campos de OliveiraRaul E. Guzman, Erick Miranda-Laferte, Rachel Conrad, Nadine Jordan, Silke Schmidt, Johnny Hendriks, Thomas Gensch,  and Patricia Hidalgo, Journal of Biological Chemistry, 290, 4561-4572 (2015)

The group around Patricia Hidalgo at the Institute of Complex Systems in Juelich, Germany, could show that the β-subunit (CaVβ) n of cardiac L-type calcium channels associates directly with actin filaments – again SiR-Actin was successfully used to get these results.

Videos showing the use of SiR-Tubulin

As SiR-stains are very photo stable and do not show toxic effects, even in long-term incubation, they are excellent tools for visualizing biological processes over time in videos.

We show here an example of dividing HeLa cell expressing mcherry-H2B (red) stained with SiR-Tubulin (green). Data have been collected by confocal imaging (Courtesy of Daniel Gerlich and Claudia Blaukopf, Institute of Molecular Biotechnology, Vienna, Austria).

Another video shows newborn mouse primary cardiac myocytes stained with SiR-actin. The authors used high speed (50fps) confocal imaging (Courtesy of Adam Kwiatkowski and Simon Watkins, Department of cell biology and center for biologic imaging, University of Pittsburgh, US).

Results provided by our customersHUVEC monolayer - Erik T. Valent and Geerten P. van Nieuw Amerongen - Amsterdam

HUVEC monolayer, stained with SiR-Actin. A ZEISS Axiovert 200 Marianas inverted microscope with custom ZEISS 40x air lens was used (Courtesy of Erik T. Valent and Geerten P. van Nieuw Amerongen, VU Medisch Centrum, Amsterdam , The Netherlands).

ACTIN MOD_J_Millan_2015_1Human endothelial cells B4G12 were grown on Ibidi® µ-Slide 4 Well dishes at confluence. Cells were labeled for 2h at 37°C/5% CO2 with 0.2 mM SiR-Actin and a confocal image was acquired exciting with a Laser Helio Neon of 637 nm with a Zeiss Confocal LSM510 META system (Courtesy of Cristina Ortega Muñoz and Jaime Millan, Centro de Biologica Molecular, Madrid, Spain).


SiR-Actin staining for transient labeling of breast cancer cells implanted into a xenogeneic zebrafish host. SiR-Actin stained cells (MDA-mb231B1 dsRED), stained overnight, followed for 6 days via confocal imaging (Leica TCS SPE) microscope (63x objective). Note the retention of SiR-Actin in vitro, and the absence of cellular artefacts with concentrations of SiR-Actin below 100 nM. Cytosolic CMV driven dsRED shown in red and Sir-Actin shown in cyan (Courtesy of Arwin Groenewoud and B. Ewa Snaar-Jagalska, Institute of Biology, Leiden, The Netherlands).

Sir-Actin (SC001)staining for transient labeling of breast cancer cells implanted into a xenogeneic zebrafish host - Arwin Groenewoud and B. Ewa Snaar-Jagalska, Leiden

STORM spines (1)Primary neurons derived from cortex + hippocampus of wild type mouse C57BL/6J were cultured for 19 days and subsequently stained with SiR-Actin and visualized with a Nikon NSTORM to shown spine formation (Courtesy of Oxana Klementieva, Gunnar Gouras (Lund University) and Catherine Kitts from Lund University Bioimaging Center [LBIC], Sweden).

We would like to thank all the users who provided the pictures and results!

And of course, we invite all researchers who would like to test the SiR stains in their laboratory to contact us through the form sheet below.


  1. […] its growth has been recently released for research applications (BPA). A few weeks before, SiR stains were successfully launched for Actin and Tubulin Live Cell Imaging (SiR-actin Live cell Imaging […]

  2. […] f you would like to get an overview about the results SiR-actin users got so far, please have a look at my recent blog: User experience of SiR-Actin and SiR-Tubulin Live Cell Imaging. […]

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