Effects of cell adhesion motif, fiber stiffness, and cyclic strain on tenocyte gene expression in a tendon mimetic fiber composite hydrogel.
Biochem Biophys Res Commun
; 499(3): 642-647, 2018 05 15.
Article
en En
| MEDLINE
| ID: mdl-29601813
ABSTRACT
We recently developed a fiber composite consisting of tenocytes seeded onto discontinuous fibers embedded within a hydrogel, designed to mimic physiological tendon micromechanics of tension and shear. This study examined if cell adhesion peptide (DGEA or YRGDS), fiber modulus (50 or 1300â¯kPa) and/or cyclic strain (5% strain, 1â¯Hz) influenced bovine tenocyte gene expression. Ten genes were analyzed and none were sensitive to peptide or fiber modulus in the absence of cyclic tensile strain. Genes associated with tendon (SCX and TNMD), collagens (COL1A1, COL3A1, COL11A1), and matrix remodelling (MMP1, MMP2, and TIMP3) were insensitive to cyclic strain. Contrarily, cyclic strain up-regulated IL6 by 30-fold and MMP3 by 10-fold in soft YRGDS fibers. IL6 expression in soft YRGDS fibers was 5.7 and 3.3-fold greater than in soft DGEA fibers and stiff RGD fibers, respectively, under cyclic strain. Our findings suggest that changes in the surrounding matrix can influence catabolic genes in tenocytes when cultured in a complex strain environment mimicking that of tendon, while having minimal effects on tendon and homeostatic genes.
Palabras clave
Texto completo:
1
Colección:
01-internacional
Asunto principal:
Péptidos
/
Polietilenglicoles
/
Estrés Mecánico
/
Tendones
/
Resistencia a la Tracción
/
Regulación de la Expresión Génica
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Hidrogeles
/
Tenocitos
Límite:
Animals
Idioma:
En
Revista:
Biochem Biophys Res Commun
Año:
2018
Tipo del documento:
Article
País de afiliación:
Reino Unido