Tissue reconstruction of abdominal wall with butyric acid-based nets: preliminary in vitro test using tissue engineering strategies.

OBJECTIVE: A hernia of the abdominal wall is an opening of the muscles in the abdominal wall, which is frequently treated via the application of a surgical mesh. The purpose of this research is to study how human adipose-derived stem cells (hADSCs) interact with Phasix™ Mesh, a commercially available mesh for hernia repair. Studying how cells derived from the abdominal region behave with Phasix™ Mesh is crucial to improve the state of the art of current surgery and achieve effective tissue restoration. MATERIALS AND METHODS: hADSCs were seeded onto Phasix™ Mesh, a fully resorbable surgical mesh of poly (4-hydroxybutyric acid) (P4HB). Cell viability was assessed through MTT assay, and cell growth and adhesion were evaluated via multiple imaging techniques and gene imaging profiling. RESULTS: Results confirm that the nets support cells proliferation, extracellular matrix production and increasing of angiogenetic factor. CONCLUSIONS: Butyric acid-based nets are promising scaffolds for abdominal wall reconstruction.

Muscle transcriptome profiling in divergent phenotype swine breeds during growth using microarray and RT-PCR tools.

Using an array consisting of 10 665 70-mer oligonucleotide probes, the longissimus dorsi muscle tissue expression during growth in nine pigs belonging to Casertana (CT), an autochthonous breed characterized by slow growth and a massive accumulation of backfat, was compared with that of two cosmopolitan breeds, Large White (LW) and a crossbreed (CB; Duroc × Landrace × Large White). The results were validated by real-time PCR. All animals were of the same age and were raised under the same environmental conditions. Muscle tissues were collected at 3, 6, 9 and 11 months of age, and a total of 173 genes showed significant differential expression between CT and the cosmopolitan genetic types at 3 months of age. Time series cluster analysis indicated that the CT breed had a different pattern of gene expression compared with that of the LW and the CB. Four of the eight clusters highlighted the gene differences between CT and the other two breeds, which were further supported by statistical analyses: clusters 4 and 5 contained a total of 71 genes that were underexpressed at 3 months of age, and cluster 3 and cluster 7 included 28 and 42 genes respectively that were overexpressed at 3 months of age. As expected, differentially expressed genes belonged to the category of genes coding for contractile fibres and transcription factors involved in muscle development and differentiation. These findings highlight muscle expression genes during pig growth and are useful to understand the genetic meaning of the different developmental rates.