Monday, August 9, 2010


Loss of NAC1 Expression Is Associated with Defective Bony Patterning in the Murine Vertebral Axis.

"NAC1 encoded by NACC1 is a member of the BTB/POZ family of proteins and participates in several pathobiological processes. We compared homozygous null mutant Nacc1(-/-) and wild type Nacc1(+/+) mice to determine the consequences of diminished NAC1 expression. The most remarkable change in Nacc1(-/-) mice was a vertebral patterning defect in which most knockout animals exhibited a morphological transformation of the sixth lumbar vertebra (L6) into a sacral identity; thus, the total number of pre-sacral vertebrae was decreased by one (to 25) in Nacc1(-/-) mice. Heterozygous Nacc1(+/-) mice had an increased tendency to adopt an intermediate phenotype in which L6 underwent partial sacralization. Nacc1(-/-) mice also exhibited non-closure of the dorsal aspects of thoracic vertebrae T10-T12. Chondrocytes from Nacc1(+/+) mice expressed abundant NAC1 while Nacc1(-/-) chondrocytes had undetectable levels. Loss of NAC1 in Nacc1(-/-) mice was associated with significantly reduced chondrocyte migratory potential as well as decreased expression of matrilin-3 and matrilin-4, two cartilage-associated extracellular matrix proteins with roles in the development and homeostasis of cartilage and bone. NAC1 participates in the motility and differentiation of developing chondrocytes and cartilaginous tissues, and its expression is necessary to maintain normal axial patterning of murine skeleton."

Nacc1 slightly increased cell proliferation.  Matn4 was more signifactly regulated by NAC1 than MATN3.  Both MATN3 and MATN4 are upregulated by LSJL.

"several genes differentially expressed by NAC1 were involved in cell migration. These include forkhead box Q1 (FOXQ1), insulin-like growth factor-binding protein-6 (IGFBP6), chemokine (C-X-C motif) ligand 1 (CXCL1, also known as GRO╬▒), drebrin-like protein (DBNL, also known as mammalian actin-binding protein-1), and Rho-associated, coiled-coil-containing protein kinase 2 (ROCK2)"

Microarray gene expression data versus LSJL(Supp Figure 1 to be done).

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