Apoptosis in Bone Cells

  • B. F. Boyce
  • D. E. Hughes
  • K. R. Wright
  • L. Xing
  • A. Dai
Part of the Ernst Schering Research Foundation Workshop book series (SCHERING FOUND, volume 25)

Abstract

Apoptosis is an important regulatory process that, in combination with cell division, determines not only cell numbers, but also the shape and volume of individual organs (Kerr et al. 1972; Wyllie et al. 1980). It is critical during embryonic development for the elimination of superfluous cells, such as the connective tissue between developing fingers (a bone morphogenetic protein (BMP)-dependent process; Zou and Niswander 1996; Yokouchi et al. 1996), and for ensuring that folding and rotation of primitive tissues occur at precise times. High mitotic and low apoptotic rates ensure the rapid growth of highly malignant tumors (Mooney et al. 1995), while induction of massive apoptosis is a major mechanism of action of most chemotherapeutic agents (Lowe et al. 1993) and irradiation therapy (Lee and Bernstein 1993) to reduce tumor volume. Large-scale apoptosis of breast cells follows the cessation of lactation and leads to the associated reduction in breast size, and shrinkage of prostatic tissue after orchidectomy occurs by a similar mechanism (Reed 1994). Because bone is a hormonally sensitive tissue, it is possible that apoptosis of bone cells could be a major determinant of bone shape and volume and, as with the breast and prostate, the amount of tissue present is likely to be regulated by the activity of hormones and growth factors.

Keywords

Shrinkage Testosterone Glucocorticoid Androgen Cyclosporine 

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Copyright information

© Springer-Verlag Berlin Heidelberg 1998

Authors and Affiliations

  • B. F. Boyce
  • D. E. Hughes
  • K. R. Wright
  • L. Xing
  • A. Dai

There are no affiliations available

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