Hematological targets of radiation damage.

Abstract:

:Radiation-induced myelosuppression remains a rate-limiting factor of radiotherapy and chemotherapy. Therefore, hematological targets of radiation damage are of great significance for radiation oncology and normal tissue injury and protection. Protection of hematopoietic stem and progenitor cells is pivotal. In order to develop therapeutic targets, it is necessary to understand the mechanisms of stem cell renewal and differentiation. Recent advances in the molecular pathology of hematopoietic stem cells indicate a fine balance between various extrinsic and intrinsic signaling pathways in preserving the self-renewal and proliferative capacity of stem cells. Extrinsic signaling involves a microenvironment niche factors such as neighboring stromal cells, osteoblasts, and adipocytes secreting cytokines, chemokines, and metalloproteinases; intrinsic regulation involves Wnt/hedgehog/Notch signaling, DNA damage-induced epigenetic alterations, telomere shortening, and early senescence. Various drugs including synthetic cytokine mimetics, cytokine stimulators, and DNA repair modulators are being tested as radioprotectants. Colony-stimulating factors are routinely used in clinics to treat neutropenia induced by chemotherapy and radiotherapy as well as to mobilize and expand progenitors used in autologous transplantation. However, toxicity has limited their use. The vitamin E isoforms gamma tocotrienol, a potent free radical scavenger that has displayed promising anticarcinogenic properties, was recently shown to protect bone marrow (BM) from radiation injury and to stimulate hematopoiesis in a murine model. This chapter focuses on the potential targets of radiation damage in BM and speculates on the mechanisms of protection by γ-tocotrienol and how these mechanisms can contribute to radioprotection in general and to protection of BM during chemotherapy and radiotherapy in particular.

journal_name

Curr Drug Targets

journal_title

Current drug targets

authors

Kulkarni S,Ghosh SP,Hauer-Jensen M,Kumar KS

doi

10.2174/1389450111009011375

subject

Has Abstract

pub_date

2010-11-01 00:00:00

pages

1375-85

issue

11

eissn

1389-4501

issn

1873-5592

pii

BSP/CDT/E-Pub/00116

journal_volume

11

pub_type

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