Weng J-H., Cheung C., Talbot P.
Stem Cell Research, 2018
This study characterizes dynamic and apoptotic blebbing in human embryonic stem cells (hESC), identifies dynamic blebbing as a bottleneck to successful cell attachment during passaging, and demonstrates that dynamic blebbing can be rapidly stopped by plating cells on recombinant human laminin. In freshly plated hESC, dynamic and apoptotic blebbing differed in time of occurrence, bleb retraction rate, mitochondrial membrane potential, and caspase 3&7 activation. While dynamic blebbing can be controlled with drugs that inhibit myosin II, these methods have off-target effects and are not suitable for clinical applications. Recombinant human laminin-521 or addition of laminin-111 to Matrigel provided a safe method to drastically decrease dynamic blebbing and improve cell attachment with proteins normally found in the inner cell mass. Inhibition of focal adhesion kinase, which is activated by binding of integrins to laminin, prolonged dynamic blebbing and inhibited attachment. These data show that hESC bind rapidly to laminins through an integrin, which activates focal adhesion kinase that in turn downregulates dynamic blebbing. Laminins enabled hESC to rapidly attach during passaging, improved plating efficiency, enabled passaging of single pluripotent stem cells, and avoided use of inhibitors that have non-specific off-target effects. These data provide a strategy for improving hESC culture using biologically safe recombinant human proteins.
Laminin 521 stabilizes the pluripotency expression pattern of human embryonic stem cells initially derived on feeder cells
Albalushi H., Kurek M., Karlsson L., Landreh L., Rós Kjartansdóttir K., Söder O., Hovatta O., Stukenborg J-B.
Stem Cell International, 2017
In this article, the authors tested the effect of the laminin-521 substrate on cultured hES cells. Five male hES cell lines, originally derived on human foreskin fibroblasts (hFFs), were cultured on hFF, Matrigel, laminin-521 or laminin-121 for nine passages. Variations in gene expression related to pluripotency, stemness and male germ and somatic gonadal cells at different passages and different culture methods were evaluated. All cell lines expressed pluripotency markers at protein and gene level and were able to differentiate into cell types of the three germ layers after being cultured on laminin-521 for nine passages. Laminin 521 had no obvious effect on the expression of genes related to male germ cells and somatic gonadal cells, when used as a matrix for hES cell cultures. Importantly, reduction in variation of pluripotency marker expression was observed after culturing the cells on laminin-521 compared to culture on hFFs, and could be reduced further with an increased culture period on laminin-521. Changing the cell culture medium of hES cells on hFFs from Dulbecco's Modified Eagle Medium (DMEM) to NutriStem, which is commonly used for culturing the cells on matrices, did not affect the variation of pluripotency genes and genes related to stemness expression. hES cells cultured on laminin-521 were more homogenous, attached better and grew faster compared to hES cells cultured on matrigel. The results show that laminin-521 provides an optimal culture conditions for adaptation to feeder- and xeno free conditions of hES cells derived and cultured on feeder cells. Morever, laminin-521 have a positive effect on stabilizing and homogenizing pluripotent gene expression profiles between hES cell lines provides the first step towards more controllable and robust culture conditions for hES cells.
Rodin S., Antonsson L., Hovatta O., Tryggvason K.
Nature Protocols, 2014 (b)
Detailed step-by-step protocols for transfer, expansion and clonal growth of hPSCs on laminin-521. Here the authors describe predictable monolayer, xeno-free and defined culturing of hPSCs on LN-521. In the article there is an important assembly of protocols for LN-521 based hPSC bulk expansion, true clone generation, the secure transfer step-by-step from feeders to LN-521, freezing and thawing as single cells using FREEZEstem. There are also critical steps and reagents included for easier handling of more difficult lines and a useful trouble shooting guide for solving problems faster.
Rodin S., Antonsson L., Niaudet C., Simonson O.E., Salmela E., Hansson E.M., Domogatskaya A., Xiao Z., Damdimopoulou P., Sheikhi M., Inzunza J., Nilsson A.S., Baker D., Kuiper R., Sun Y., Blennow E., Nordenskjöld M., Grinnemo K.H., Kere J., Betsholtz C., Hovatta O., Tryggvason K.
Nature Communications 2014 (a)
This article provides scientific evidence that LN-521 is the optimal matrix for generation and culture of human pluripotent stem cells. Laminin-521 successfully recreates the biologically relevant hPSC milieu in vitro and via integrin binding, laminin-521 induces the PI3K/Akt signaling pathway, promoting survival and robust self-renewal of human embryonic stem cells (hESC) and induced pluripotent stem cells (iPSC). Clonal derivation and single-cell expansion of hPSCs on laminin-521.This article provides scientific evidence that LN-521 is the optimal matrix for generation and culture of human pluripotent stem cells. It is described in detail how this physiologically relevant laminin establishes genetically stable hESC lines in an efficient, defined, xeno-free and feeder-free procedure, suitable for stem cell banking and regenerative medicine applications. It is even possible to derive embryonic stem cells from a single blastomere, thereby avoiding the ethical dilemma associated with the destruction of donated embryos. LN-511 binds the same integrin but the α6β1 integrin mediating effects of LN-521 is much stronger than that of LN-511 which results in a more robust PSC expansion on LN-521.
Laperle A., Hsiao C., Lampe M., Mortier J., Saha K., Palecek S.P., and Masters K.S.
Stem Cell Reports, 2015
The authors study the role of endogenously produced extracellular matrix (ECM) components in regulating hPSC fates. They identify a-5 laminin as a signature ECM component endogenously synthesized by undifferentiated hESC and hiPSC cultured on defined substrates. The cells also produced collagen I but no vitronectin or fibronectin. Knockdown and disruption of the LAMA5 gene dramatically reduced hPSC self-renewal and increased apoptosis without affecting the expression of pluripotency markers. Self-renewal and survival was restored to wild-type levels by culturing the LAMA5-deficient cells on exogenous laminin-521. Synthemax or Vitronectin could not restore survival. Treatment of LAMA5-deficient cells with blebbistatin or a ROCK inhibitor partially restored self-renewal and diminished apoptosis. These results demonstrate that endogenous a-5 laminin promotes hPSC survival and self-renewal in an autocrine and paracrine manner. A good publication that also show how much better laminin-521 performs compared to other competitor matrices.
Jacobs K., Zambelli F., Mertzanidou A., Smolders I., Geens M., Nguyen H.T., Barbé L., Sermon K., Spits C.
Stem Cell Reports, 2016
Here, the authors demonstrate a direct correlation between medium acidification linked to culture density, and the occurrence of DNA damage and genomic alterations in hESC grown on feeder layers. This, in turn, results in an increase of cells in G1 and a stalling of the S phase, without an increase in cell death or a loss of pluripotency. The DNA effects are rapid and occurs in the short time span of a single passage. However, culture density has no effect on the level of apoptosis. Increasing the frequency of the medium refreshments minimizes the levels of DNA damage and genetic instability. hESC grown on laminin-521 show a decreased proneness to acquiring DNA damage during suboptimal culture conditions, such as medium acidification during high culture density.
Villa-Diaz L.G., Kim J.K., Laperle A., Palecek S.P., Krebsbach P.H.
Stem Cells, 2016
Newly identified pathway in hPSCs contribute to a better understanding of how laminin-521 maintain pluripotency and self‐renewal. In hPSCs, α6β1 is the dominant integrin of which laminin-521 is a strong inducer. Here the authors describe a signaling pathway in hPSCs linking self‐renewal and expression of pluripotency transcription factors to integrin α6β1 and inactivation of focal adhesion kinase (FAK). Disruption of this pathway results in hPSC differentiation. During differentiation, integrin α6 levels diminish and FAK is phosphorylated and activated. Integrin α6 functions in inactivation of integrin B1 and FAK signaling and prevention of hPSC differentiation. hPSCs remodel the extracellular microenvironment and deposit laminin α5, the primary ligand of integrin α6β1. Knockdown of laminin α5 resulted in reduction of integrin α6 expression, phosphorylation of FAK and decreased Oct4. In conclusion, hPSCs promote the expression of integrin α6β1, and nuclear localization and inactivation of FAK to supports stem cell self‐renewal.
Canham M.A, Van Deusen A., Brison D.R., De Sousa P.A., Downie J., Devito L., Hewitt Z.A., Ilic D., Kimber S.J., Moore H.D., Murray H., Kunath T.
Scientific Reports, 2015
It is essential to know the genetic stability of the hESC lines before progressing to clinical trials. In this study they evaluated the molecular karyotype of 25 clinical-grade hESC lines by whole-genome single nucleotide polymorphism (SNP) array analysis. A total of 15 unique copy number variations (CNVs) greater than 100 kb were detected, most of which were found to be naturally occurring in the human population and none were associated with culture adaptation. The hESC lines were all cultured on laminin-521.
Uhlin E., Rönnholm H., Day K., Kele M., Tammimies K., Bölte S., Falk A.
Stem Cell Res., 2017
Human induced pluripotent stem (hiPS) cell lines CTRL-9-II and CTRL-10-I were derived from healthy monozygotic twin donors using non-integrating RNA based Sendai virus reprogramming and cultured in a xeno-free chemically defined condition on the laminin-521 cell culture substrate. The established hiPS cell lines, CTRL-9-II and CTRL-10-I, are karyotypically normal, free from reprogramming vectors, display endogenously expression of pluripotency factors at levels similar to embryonic stem cells. The generated iPS cell lines demonstrate pluripotency by passing bioinformatics assay PluriTest and by embryonic body assay.
Kele M., Day K., Rönnholm H., Schuster J., Dahl N., Falk A.
Stem cell research, 2016
CTL07-II is a healthy feeder-free and characterized human induced pluripotent stem (iPS) cell line cultured under xeno-free and defined conditions. iPS cell coating during derivation and expansion was human recombinant Laminin-521. The line is generated from healthy human fibroblasts with non-integrating Sendai virus vectors encoding the four Yamanaka factors, OCT4, SOX2, KLF4 and cMYC. The generated iPS cells are free from reprogramming vectors and their purity, karyotypic stability and pluripotent capacity is confirmed.
Tano K., Yasuda S., Kuroda T., Saito H., Umezawa A., Sato Y.
Plos One, 2014
In the article the authors use LN-521 for a safety step for iPS cells going for therapeutic purpose. This group is responsible for dictating the safety aspects of future regen med in Japan. Tano and colleagues show a novel approach based on LN-521 for direct and sensitive detection of trace amounts of residual undifferentiated hPSCs for cell therapy products. The presence of contaminating hPSCs in cell therapy products is a major quality concern associated with tumorigenicity and this first in vitro assay is direct, simple and cost-effective. The highly efficient culture system using LN-521 detected colony forming hPSCs spiked into primary human MSCs or neurons at a ratio as low as 0.001%–0.01%.
Lu H.F., Chai C., Lim T.C., Leong M.F., Lim J.K., Gao S., Lim K.L., Wan A.C.
Reprogramming of iPSCs on LN-521 and direct differentiation to dopaminergic cells on Laminin-521. This article demonstrates LN-521 as an optimal defined, xeno- and feeder-free matrix for the reprogramming of human iPS cells. Laminin-521 achieves high-efficiency reprogramming in different media, fast and easy expansion as well as direct differentiation to dopaminergic neurons on LN-521. The authors conclude that the efficient transgene-free hiPSC derivation and expansion on LN-521 enables clinical applications useful for human patient iPSCs and derivatives for cellular therapy.
Hongisto H., Vuoristo S., Mikhailova A., Suuronen R., Virtanen I., Otonkoski T., Skottman H.
Stem Cell Res., 2012
The authors of this study show that fibroblast feeders synthesize laminin-511 and that this is the main protein responsible for the maintenance of hESC pluripotency. This strengthens the already known biological function of laminin-511 and laminin-521 as the main cell-adhesion molecules for pluripotent stem cells.
Miyazaki T., Nakatsuji N., and Suemori H.
Increased viability of hPSCs through single-cell freezing/thawing/expansion on Laminin-521.This is one of the first customer publications that demonstrates Laminin-521 as an optimal xeno- and feeder-free matrix for pluripotent stem cells. The authors show cells should be cryopreserved as single cells for highest survival which is specifically supported by Laminin-521 that promotes adhesion and self-renewal of fully dissociated single cells in the absence of ROCK inhibitor. They demonstrate 80-90% survival of hPSCs post-thawing and 60% survival following subculture on Laminin-521, allowing for efficient and easy handling of cells and bulk storage of high-quality hPSCs.
Leino M., Astrand C., Hughes-Brittain N., Robb B., McKean R., Chotteau V.
J Biomed Mater Res Part B 2017
Here, the authors describe a nonaggregate culture system of human embryonic stem cells inside electrospun polycaprolactone (PCL) fiber scaffolds combined with the defined extracellular proteins laminin-521, naturally occurring in the stem cell niche. PCL fiber scaffolds coated with recombinant human laminin-521 readily supported initial stem cell attachment and growth from a single-cell suspension. The combination of recombinant E-cadherin-Fc and laminin-521 sigthly improved cell dispersion rendering a uniform cell population. Finally, we showed that the cells cultured in Ecadherin-Fc- and laminin-521-coated PCL scaffolds could differentiate into all three germ layers. Importantly, we provided a chemically defined 3-D system in which pluripotent stem cells grown and differentiated avoiding the formation of cell aggregates.
Carlson-Stevermer J., Goedland M., Steyer B., Movaghar A., Lou M., Kohlenberg L., Prestil R., Saha K.
Stem Cell Reports, 2016
The authors developed a genome editing method where they utilize surface-modified multiwell plates containing one-pot transcribed single-guide RNAs for automated, live, high-content imaging and analysis. To test the speed and efficiency of genome editing method the authors used the LAMA5 gene encoding a-5 laminin since this extracellular matrix protein is known to be an important autocrine/paracrine factor regulating survival and self-renewal of hESCs. The LAMA5 edited hESC clones exhibited decreased rates of self-renewal and increased rate of apoptosis and culture on Matrigel was insufficient to rescue the growth phenotype. However, when cultured on human recombinant laminin-521, all LAMA5 gene-edited lines were rescued with growth rate and levels of apoptosis similar to the wild-type cells. This publication is another proof of principle for the LN-521 stem cell matrix showing that a5 laminin is a critical factor for hPSC survival and self-renewal.
Walczak M. P., Drozd A. M., Stoczynska-Fidelus E., Rieske P., Grzela D.P.
Journal of Translational Medicine, 2016
Here, the authors show that the highest efficiencies of reprogramming of fibroblasts were obtained on Laminin-511 and Laminin-521, compared to other coatings. iPSC cell lines was created with stably integrated PDX1 and NKX6.1 transgenes under the transcriptional control of doxycycline-inducible promoter. These cells were differentiated to insulin producing cells. Generated cells displayed molecular markers characteristic for respective steps of the differentiation. The obtained IPC secreted insulin and produced C-peptide with significantly higher hormone release level in case of the combined expression of PDX1 and NKX6.1 induced at the last stage of the differentiation. Efficiency of differentiation of iPSC to IPC can be increased by concurrent expression of PDX1 and NKX6.1 during progenitor cells maturation.
Lam A.T., Li J., Chen A.K., Birch W.R., Reuveny S., Oh S.K.
BioResearch Open Access, 2015
The authors show that LN-521 enables efficient cell attachment and spreading of hPSCs that results in high cell yields (~3.5×10^6 cells/mL) within 7 days in agitated plate and scalable spinner cultures. This offers a defined, xeno-free, GMP-compatible, and scalable bioprocessing platform for the production of hPSC with the quantity and quality compliant for clinical applications. Use of LN-521 on microcarriers also enabled a 34% savings in matrix and media costs over monolayer cultures to produce 10^8 cells.
Deglincerti A., Etoc F., Guerra C.M., Martyn I., Metzger J., Ruzo A., Simunovic M., Yoney A., Brivanlou A.H. Siggia E., Warmflash A.
Nature protocol, 2016
Here, the authors developed an reproducible in vitro protocols that allow the study of spatial organization associated with this developmental transition. They use a micropatterning approach in which human embryonic stem cells are confined to disk-shaped, submillimeter colonies. After 42 h of BMP4 stimulation, cells form self-organized differentiation patterns in concentric radial domains, which express specific markers associated with the embryonic germ layers, reminiscent of gastrulating embryos. The protocol takes 3 d; it uses commercial microfabricated slides (from CYTOO), human laminin-521 as extracellular matrix coating, and either conditioned or chemically defined medium (mTeSRSR). Differentiation patterns within individual colonies can be determined by immunofluorescence and analyzed with cellular resolution. Both the size of the micropattern and the type of medium affect the patterning outcome. The LN521 coating allows for a simpler coating protocol with robust results. This protocol describes a robust platform for quantitative analysis of the mechanisms associated with pattern formation at the onset of gastrulation.
Rodin S., Domogatskaya A., Ström S., Hansson E.M., Chien K.R., Inzunza J., Hovatta O., Tryggvason K.
Nat Biotechnol., 2010
In this article the authors describe, for the first time, the use of laminin-511 as a substrate for human ES and iPS cells in vitro. The culture system is defined and devoid of animal products and feeder cells. Human pluripotent cells cultured on LN-511 substrate in this way maintained self-renewal capacity and pluripotency long-term, as well as karyotypic stability. Human ES cells plated on laminin-511 grow as a monolayer, which makes cell homogeneity particularly high.
Domogatskaya A., Rodin S., Boutaud A., Tryggvason K.
Stem Cells, 2008
Different laminin isoforms, LN-511, -332, -411 and -111, and Matrigel, gelatin and poly-D-lysine are compared as substrata maintaining pluripotent mouse ES cells in vitro without addition of leukemia inhibitory factor. Conclusions are that only LN-511 is able to sustain self-renewal for up to 169 days of culturing and cells maintain expression of pluripotency markers and can be used for generation of chimeric mice.
Hovatta O., Rodin S., Antonsson L., Tryggvason K.
Stem Cells Transl Med. 2014