ROCK inhibitor Y-27632

Technical documents: SDS CoA Datasheet
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Product overview

Name ROCK inhibitor Y-27632
Alternative names Y27632 dihydrochloride
Purity >99%
Customer comments

The ROCK inhibitor Y-27632 is working as expected. Verified customer, University of Louisville

Worked well just as it should do. Kept me informed of when product would be delivered and notified me when delivered. Good packaging and data sheet. Easy to dissolve and use and it worked! Verified customer, University of Cardiff

Description Y-27632 is a selective ROCK inhibitor. Frequently used 3D growth matrix component and for production of organoids. Also used when inducing neurons from fibroblasts.
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Fig1. ROCK inhibition assay using Y-27632

Figure1. ROCK inhibition assay using Y-27632. Y-27632 is a selective ROCK inhibitor used in a multitude of stem cell protocols. Y-27632 from Hello Bio inhibits ROCK-1 with an IC50 of 348 nM and ROCK-2 with an IC50 of 249 nM. For more details see #Protocol 1 in application notes below.
Y-27632 dihydrochloride: Scientist Approved
ROCK inhibitor Y-27632 product vial image | Hello Bio

Biological Data

Biological description

The ROCK inhibitor Y-27632 is a selective and cell permeable inhibitor of the Rho-associated protein kinase (ROCK) (Ki values are 0.14, 26 ,25 and >250 µM at p160ROCK, PKC, PKA and MLCK respectively).

Y-27632 has many biological actions and is an important small molecule modulator of stem cells. It diminishes hESC and hiPSC dissociation-induced apoptosis, enhances survival and colony formation of dissociated hESC without affecting pluripotency or self-renewal. Y-27632 also improves hESC and iPSCs postthaw viability and survival rate during cryopreservation. It is frequently used as a 3D growth matrix component and for production of organoids (e.g. brain organoids). Additionally, Y-27632 inhibits smooth muscle contractility and shows antihypertensive effect.



Rho kinase (Rho-associated coiled coil protein kinase or ROCK) is a major downstream effector for the small GTP-binding protein Rho [1]. Rho kinase is involved in various biological processes including cell mitosis adhesion, cytoskeletal adjustments, muscle cell contraction, tumor cell invasion and a series of cell biological phenomena [2]. Through a series of cascading effects, Rho kinase influences actin and microtubule regulation of apoptosis and thus plays a key role in early embryonic development [3].The Rho kinase signalling pathway is highly activated in many pathological conditions [4].

Rock inhibitor Y-27632 is a Rho kinase inhibitor which selectively inhibits p160ROCK (ROCK1) with a Ki value of 140 nM and binds to the Rho kinase ATP binding pocket in an ATP-competitive manner [5].



Y-27632 has been shown to have a diverse range of actions and has been used in a variety of biological systems. It is the most commonly used of the ROCK inhibitors in stem cell research and is used as a multifunctional reagent in many stem cell related processes [6]. Y-27632 demonstrates many positive effects across various cell types, in particular human embryonic stem cells (hESCs) and human induced pluripotent stem cells (hiPSCs) [7] and has greatly improved a number of practical stem cell procedures [8]. For example it has been shown that Y-27632 increases cell adhesion and proliferation and increases post-thaw cell survival and post-passaging cell viability [9,10].


Cellular dissociation

Cell dissociation is one of the most common manipulations in stem cell research. During cellular dissociation both hESC and hIPSCs are vulnerable to dissociation-induced apoptosis or anoikis (a form of apoptosis induced by inappropriate cell-cell or cell-ECM interactions) [3,11]. Y-27632 is of particular interest as it allows hPSCs to escape this dissociation-induced apoptosis. Y-27632 prevents apoptosis of dissociated hPSCs and increases their survival rate and plating efficiency [11].



Cryopreservation is also an important part of stem cell research. Y-27632 improves the recovery of cryopreserved hPSCs and has greatly helped simplify the cryopreservation procedure. The slow-freezing and rapid-thawing procedure which uses DMSO as a cryoprotectant is commonly used in stem cell cryopreservation, however this method is not suitable for hPSCs, therefore vitrification (fast freezing, slow thawing) is used [12]. Vitrified hPSCs do however still suffer from high levels of cell death and do not passage well as single cells [11]. The addition of Y-27632 to freezing and post-thawing medium enhances colony formation efficiency and treatment with Y-27632 during cryopreservation also increases survival rate and cell adhesion of freeze-thawed dissociated hES [12].


Application notes

#Protocol 1: ROCK Inhibition assay using Y-27632

  • ROCK-I and ROCK-II were assayed against Long S6 substrate peptide in a buffer containing 0.1mM 33P-g-ATP.
  • Enzymes were incubated with substrate for 30 minutes at room temperature before the reaction was stopped with 0.5M orthophosphoric acid.
  • Samples were transferred to a P81 unifilter plate before being washed and then remaining 33P labelled substrate being detected with a scintillation counter.

Solubility & Handling

Storage instructions Room temperature (desiccate)
Solubility overview Soluble in water (100mM), PBS (100mM), DMSO (100mM)
  • If using the compound as a cell culture supplement, you should dilute the stock solution into culture medium immediately before use.
  • Cell culture media can be prewarmed before adding the compound to avoid potential precipitation of the compound.
  • Y-2762 is often removed from medium within 20 hours
  • The compound has been shown to be effective at a final concentration of 10 µM (Ungrin et al.; Watanabe et al.)
  • Mix and filter supplemented media using a 0.2 µm low‑protein binding filter.
  • Please avoid a final DMSO concentration above 0.1% due to potential cell toxicity
Important This product is for RESEARCH USE ONLY and is not intended for therapeutic or diagnostic use. Not for human or veterinary use.



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More Info

Chemical Data

Purity >99%
Chemical name trans-4-[(1R)-1-Aminoethyl]-N-4-pyridinylcyclohexanecarboxamide dihydrochloride
Molecular Weight 320.26
Chemical structure Y-27632 dihydrochloride [129830-38-2] Chemical Structure
Molecular Formula C14H21N3O.2HCl
CAS Number 129830-38-2
PubChem identifier 9901617
Source Synthetic
InChi InChI=1S/C14H21N3O.2ClH/c1-10(15)11-2-4-12(5-3-11)14(18)17-13-6-8-16-9-7-13;;/h6-12H,2-5,15H2,1H3,(H,16,17,18);2*1H/t10-,11?,12?;;/m1../s1
MDL number MFCD03490488
Appearance White solid

References for ROCK inhibitor Y-27632

References are publications that support the biological activity of the product
  • 3, ROCK inhibitor Y27632 promotes proliferation and diminishes apoptosis of marmoset induced pluripotent stem cells by suppressing expression and activity of caspase 3.

    Wu et al (2016) Theriogenology 85(2) : 302-14
  • 10, Effect of Rho-kinase Inhibitor, Y27632, on Porcine Corneal Endothelial Cell Culture, Inflammation and Immune Regulation.

    Lee et al (2016) Ocul Immunol Inflamm 24(5) : 579-93
  • 4, Detrimental effect of post Status Epilepticus treatment with ROCK inhibitor Y-27632 in a ... model of temporal lobe epilepsy.

    Kourdougli et al (2015) Front Cell Neurosci. 9 : 413
  • 9, Failure of Y-27632 to improve the culture of adult human adipose-derived stem cells.

    Lamas et al (2015) Stem Cells Cloning 8 : 15-26
  • 6, Reprogram or reboot: small molecule approaches for the production of induced pluripotent stem cells and direct cell reprogramming.

    Jung et al (2014) ACS Chem Biol 9(1) : 80-95

Items 1 to 5 of 12 total

These publications cite the use of ROCK inhibitor Y-27632 purchased from Hello Bio:
  • Actuation enhances patterning in human neural tube organoids

    Abdel Fattah AR et al (2021) Nat Commun 12(1) : 3192
    PubMedID: 34045434
  • KSHV Susceptibility and Transmission within Tonsillar Specimens

    Aalam et al (2021) Chapman University : Thesis
  • Engineering large-scale perfused tissues via synthetic 3D soft microfluidics

    Grebenyuk et al et al (2021) Research Square
  • Neuroepithelial organoid patterning is mediated by Wnt-driven Turing mechanism

    Fattah et al (2021) bioRxiv Preprint :
  • Defective AMPA-mediated synaptic transmission and morphology in human neurons with hemizygous SHANK3 deletion engrafted in mouse prefrontal cortex

    Chiola et al (2021) Mol Psychiatry. doi: 10.1038/s41380-021-01023-2. : Online ahead of print
    PubMedID: 33558651

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