{"id":4913,"date":"2022-01-21T11:48:06","date_gmt":"2022-01-21T03:48:06","guid":{"rendered":"http:\/\/43.135.177.8\/?p=4913"},"modified":"2022-01-21T11:48:17","modified_gmt":"2022-01-21T03:48:17","slug":"functionalized-microgel-rods-interlinked-into-soft-macroporous-structures-for-3d-cell-culture","status":"publish","type":"post","link":"https:\/\/whmicro.com\/?p=4913","title":{"rendered":"Functionalized Microgel Rods Interlinked into Soft Macroporous Structures for 3D Cell Culture"},"content":{"rendered":"

[vc_row rt_row_background_width=”default” rt_row_style=”default-style” rt_row_borders=”” rt_row_paddings=”true” rt_bg_effect=”classic” rt_bg_image_repeat=”repeat” rt_bg_size=”cover” rt_bg_position=”right top” rt_bg_attachment=”scroll” rt_bg_video_format=”self-hosted”][vc_column width=”4\/5″ rt_wrp_col_paddings=”false” rt_border_top=”” rt_border_bottom=”” rt_border_left=”” rt_border_right=”” rt_border_top_mobile=”” rt_border_bottom_mobile=”” rt_border_left_mobile=”” rt_border_right_mobile=”” rt_bg_image_repeat=”repeat” rt_bg_size=”auto auto” rt_bg_position=”right top” rt_bg_attachment=”scroll”][vc_column_text]<\/p>\n

1 Introduction<\/h2>\n

To understand interactions between living matter and artificial materials, tissue engineering research groups focus on the development of 3D scaffolds with increasingly controllable properties, reaching from biochemical interactions at molecular scale to nanoscale hydrogel networks, micrometer-scale pores, and macroscopic architectures.[<\/sup>1<\/a><\/sup>]<\/sup>\u00a0Soft hydrogel scaffolds are conventionally formed by crosslinking a precursor solution, resulting in soft, tissue mimetic constructs. Cells are encapsulated in the precursor before crosslinking, while the formed hydrogel allows for cells to spread and proliferate by degrading and\/or remodeling the network.[<\/sup>2<\/a><\/sup>]<\/sup>\u00a0As an alternative to bulk hydrogel applications, macroporous 3D scaffolds are fabricated by several techniques like electrospinning, solvent casting, or gas foaming\/particle leaching, with the advantage that no degradation is required for cell migration and proliferation, which enhances the rate of cell infiltration.[<\/sup>1<\/a>,\u00a03<\/a><\/sup>]<\/sup>\u00a0Control over the porous structure in 3D cell scaffolds is of particular importance as different cell types and their subunits, like neurites, migrate in a limited yet specific manner.[<\/sup>3<\/a>,\u00a04<\/a><\/sup>]<\/sup><\/p>\n

To provide a soft environment with micrometer-scale pores in contrast to bulk hydrogels or stiff scaffolds, microporous annealed particle (MAP) scaffolds were developed by the Segura group.[<\/sup>5<\/a><\/sup>]<\/sup>\u00a0MAPs are injectable and are formed by interlinking microgels together instead of nanoscale precursor molecules, enhancing cell invasion and migration with simultaneous control over the composition of the scaffold building blocks.[<\/sup>1<\/a>,\u00a05<\/a>,\u00a06<\/a><\/sup>]<\/sup>\u00a0The macroporous void, referred to as percolated interstitium, can be varied depending on the diameter of the microgels. The position of attached cells to micro- and macroporous 3D hydrogel structures in contrast to embedded cells inside bulk-based 3D hydrogels can provide further insight for proprioception studies to form 3D functional tissue and restore damaged tissue.[<\/sup>3<\/a>,\u00a07<\/a><\/sup>]<\/sup><\/p>\n

In the first MAP report, spherical microgel building blocks were produced via microfluidics by Michael-type addition, while transglutaminase peptide substrates were coupled into the microgels to interlink them together with activated Factor XIII.[<\/sup>5<\/a>,\u00a08<\/a><\/sup>]<\/sup>\u00a0Spherical microgels in the range of 30\u2013150\u00a0\u00b5m diameter resulted in pore sizes between \u224810 and 45\u00a0\u00b5m, respectively, which are in a relevant range for cell migration.[<\/sup>1<\/a>,\u00a03<\/a>,\u00a04<\/a><\/sup>]<\/sup>\u00a0An increase in microgel stiffness and RGD concentration inside the microgel networks both result in enhanced cell spreading and better proliferation.[<\/sup>6<\/a><\/sup>]<\/sup>\u00a0Cell spreading differences were also observed depending on the microgel dimensions, favoring larger microgels likely due to the larger pore sizes available. Further employment of another biocompatible chemical interlinking mechanism, based on tetrazine norbornene cycloaddition click reaction, reduced inflammation and astrogliosis levels when MAP scaffolds were injected in the brain after a prior initiated photothrombotic stroke.[<\/sup>6<\/a>,\u00a09<\/a><\/sup>]<\/sup><\/p>\n

Alternatively, to covalent bonds between the microgels, supramolecular guest\u2013host (\u03b2<\/i>-cyclodextrin and adamantane) interactions have been employed to interlink complementary functionalized polyethylene glycol (PEG)-based spherical microgels with diameters ranging from 10 to 100\u00a0\u00b5m. This led to porous interlinked networks with interparticle distances ranging from \u22485 to 25\u00a0\u00b5m (after centrifugal filtration) that supported the growth of THP-1 monocyte cells, which have a migratory phenotype with adhesion-independent characteristics, enabling the investigation of rapid and dynamic cell behavior at the tissue scale.[<\/sup>10<\/a><\/sup>]<\/sup><\/p>\n

2 Results<\/h2>\n
\n

2.1 Microgel Rod Production via Continuous Plug-Flow On-Chip Gelation<\/h3>\n

Primary amine and epoxy microgel rods are produced via continuous on-chip gelation in microfluidics. The free-radical polymerization (FRP) crosslinking reaction is triggered by controlled UV-irradiation inside the straight section of the microfluidic channel before the outlet utilizing lithium phenyl-2,4,6-trimethylbenzoylphosphinate (LAP) as photoinitiator. To apply UV-radiation (\u03bb<\/i>\u00a0= 365\u00a0nm) dose appropriate for crosslinking on-chip, different irradiance settings ranging from 128 to 957\u00a0mW cm\u22122<\/sup>\u00a0are tested with an irradiation time of \u22482.3 s. This revealed that for higher initial AMA concentrations, a higher light intensity is needed to crosslink the microgels sufficiently on-chip to avoid deformation after leaving the device. If 957 mW\u00a0cm\u22122<\/sup>\u00a0is applied, all microgels retain their aspect ratio and no further flow changes are observed at higher irradiation power (Figure\u00a0S1<\/a>, Supporting Information).<\/p>\n

To enable continuous collection of all types of rod-shaped microgels, the transport of the product out of the outlet required a second flow-focusing oil-stream (Figure<\/b>\u00a01<\/a>). This oil stream avoids potential jamming of the anisometric microgels at the outlet chamber caused by the higher aspect ratio compared to spherical microgels. The chip design facilitates flushing out the crosslinked microgels at the microfluidic outlet, as the resistance is reduced (Figure\u00a0S1<\/a>, Supporting Information). The production rate of microgel rods employed in this study is \u224811\u00a0300 microgels per hour.<\/p>\n

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\"image\"<\/picture><\/a><\/figure>\n<\/section>\n

Please refer to the original article:<\/a><\/p>\n<\/section>\n

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[vc_row rt_row_background_width=”default” rt_row_style=”default-style” rt_row_borders=”” rt_row_paddings=”true” rt_bg_effect=”classic” rt_bg_image_repeat=”repeat” rt_bg_size=”cover” rt_bg_position=”right top” rt_bg_attachment=”scroll” rt_bg_video_format=”self-hosted”][vc_column width=”4\/5″ rt_wrp_col_paddings=”false” rt_border_top=”” rt_border_bottom=”” rt_border_left=”” rt_border_right=”” rt_border_top_mobile=”” rt_border_bottom_mobile=”” rt_border_left_mobile=”” rt_border_right_mobile=”” rt_bg_image_repeat=”repeat” rt_bg_size=”auto auto” rt_bg_position=”right top” rt_bg_attachment=”scroll”][vc_column_text] 1 Introduction To understand interactions between living matter and artificial materials, tissue engineering research groups focus on the development of 3D scaffolds with increasingly controllable properties, reaching […]<\/p>\n","protected":false},"author":1,"featured_media":4914,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"yoast_head":"\nFunctionalized Microgel Rods Interlinked into Soft Macroporous Structures for 3D Cell Culture - 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