Providing cyto and, biocompatible, biodegradable, permissive, elastic and,
three-dimensional extra-cellular microenvironment with bio-mimicking capabilities is a
daunting challenge in contemporary tissue bioengineering. The ability to guide cell
differentiation and proliferation with adequate adaption to the desired functional tissue
or, organ forming with positive affinity for extracellular support in regeneration and,
enough spatio-temporal feasibility for newly constructs and advancing cell mass are
amongst the most desirables towards producing functional bioconstructs in the modern
tissue bio-engineering realm. The scaffold providing extracellular microenvironment
with its desired porosity and surface properties is the main driving force that primarily
influences the cell bio-engineering outcomes. The physical factors at the localized
cellular microenvironment, individual cell’s shape with the overall cellular-mass
geometry at its generation and, propagation stages, biomatrix’s response(s) and
interfacial interactions feasibilities between the biomass and the extracellular matrixsupport
platform along with the molecular recognition capabilities on both sides with
the involved and, mutually related bio-mechanics as well as intra-entities environmental
forces of physico-mechanical nature and, the surface specifications of the matrixsupport,
be it the nano or micro-topographical features of the extracellular supportmatrix
or, the force(s) responsible for interplay among various factors causing cellular
and sub-cellular level contractions are very important and crucial deciding factors in
preparative-designs and outcomes of the tissue bioengineering matrix support platform.
The external resisting factors originating from the support matrix constituting the
extracellular microenvironment with potent growth-factors mediated signaling as well
as presence of nutrients, biochemicals, gases and their diffusions have, at all times,
impacted very strong influences on regulating the overall cell-fate in the extracellular
microenvironment towards generating the desired biomass. Various matrix-support or
the scaffolds for encompassing the extracellular microenvironment have been
developed. These materials are far from perfect or practical enough for various
characteristically defined outcomes, hence fewer types of scaffold materials fit for
majority of functional characteristics. Several bioengineering tools and, nano and
micro-scale specifications laden entities, materials and, devices of biomaterial and
synthetic origins are being employed successfully to develop scaffold and its materials
to fulfill the essentials in tissue bioengineering domain towards producing various
bioconstructs and tissue types by providing desired scaffold. The employed, natural or
synthetic, molecular devices, materials and chemical entities, mostly polymeric in
nature, with proven intrinsic properties and extrinsic physical factors significantly
playout in practical tissue-engineering situations recapitulate the critical biochemical
and biophysical aspects of the developing cell types in the generated extracellular
microenvironment for desired tissue bioengineering constructs outcomes through the
environment of the scaffold. Some of these materials, entities and devices in-use now
include bio-compatible polymeric hydrogels, single and, composite synthetic and
natural polymeric materials in random or, designated/patterned formations or, in
layered/arrayed scaffoldings, the nanofibers, semi and fully-lithographed polymeric
material devices, proteins, polypeptides, antibiotic-based hydrogels as well as scaffolds
produced through a variety of techniques including photo-reactivity with their inherent
specifications for producing the intended scaffold are worth mentioning.
Keywords: Extracellular Microenvironment, Biomaterials, Biopolymers, Synthetic
Polymers, Homo & Hetero-Polymers, 3D-Scaffold, Functional Tissue Bioengineering,
Collagen, Chondroitin Sulfate, PEG, Hydrogels, Nanofiber, Electrospinning.
