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Sadek, C.M. et al.

Sadek, Pelto-Huikko, Tujague, Steffensen, Wennerholm, Gustafsson,

TACC3 expression is tightly regulated during early differentiation.

Transforming acidic coiled-coil (TACC) proteins are hypothesized to play a role in normal cellular growth and differentiation and to be involved in centrosomal microtubule stabilization. Our current studies aim to delineate the expression pattern of TACC3 protein during cellular differentiation and in a variety of normal human tissues. TACC3 is known to be upregulated in differentiating erythroid progenitor cells following treatment with erythropoietin and is required for replication of hematopoietic stem cells. However, we demonstrate that a dramatic upregulation of TACC3 also occurs during the early differentiation of NIH 3T3-L1 cells into adipocytes and PC12 cells into neurons, indicating that TACC3 mediates cellular differentiation in several cell types. Using real-time PCR, we quantitated the mRNA levels of TACC3 compared to TACC1 and TACC2 in various human adult tissues. We observed the highest expression of TACC3 mRNA in testis, spleen, thymus and peripheral blood leukocytes, all tissues undergoing high rates of differentiation, and a lower level of expression in ovary, prostate, pancreas, colon, small intestine, liver and kidney. In contrast, TACC1 and TACC2 mRNA levels are more widespread. By immunohistochemistry, we confirm that the TACC3 protein localizes to differentiating cell types, including spermatocytes, oocytes, epithelial cells, bone marrow cells and lymphocytes. Thus, these observations are concordant with a basic role for TACC3 during early stages of differentiation in normal tissues.[1]

References

TACC3 expression is tightly regulated during early differentiation. Sadek, C.M., Pelto-Huikko, M., Tujague, M., Steffensen, K.R., Wennerholm, M., Gustafsson, J.A. Gene Expr. Patterns (2003) [Pubmed]

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