Radiation-induced micronucleus formation in mouse bone marrow after low dose exposures

G. C. Jagetia, N. G. Ganapathi

Research output: Contribution to journalArticle

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Abstract

The incidence of micronucleus formation was studied at 12, 24 and 36 h post-irradiation in the polychromatic (PCE) and normochromatic (NCE) erythrocytes of the bone marrow of mice whole-body exposed to 0, 3, 9, 18, 36, 54 and 72 cGy of 60Co γ-radiation. It was observed that the frequency of micronucleated polychromatic erythrocytes (MPCE) increased with the increase in exposure dose at all the post-irradiation time periods studied. Similarly, the frequency of micronucleated normochromatic erythrocytes (MNCE) also increased with the increase in exposure dose and the increase for both MPCE and MNCE was dose related. The dose-response relationship was linear-quadratic for both MPCE and MNCE. The study of mitotic index revealed that a dose as low as 9 cGy is capable of reducing the mitotic index significantly at 24 h post-irradiation and the dose response was linear-quadratic. However, no significant decline in the mitotic index was observed at 12 and 36 h post-irradiation.

Original languageEnglish
Pages (from-to)235-242
Number of pages8
JournalMutation Research - Fundamental and Molecular Mechanisms of Mutagenesis
Volume304
Issue number2
DOIs
Publication statusPublished - 16-01-1994
Externally publishedYes

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Erythrocytes
Bone Marrow
Radiation
Mitotic Index
Incidence

All Science Journal Classification (ASJC) codes

  • Molecular Biology
  • Health, Toxicology and Mutagenesis

Cite this

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abstract = "The incidence of micronucleus formation was studied at 12, 24 and 36 h post-irradiation in the polychromatic (PCE) and normochromatic (NCE) erythrocytes of the bone marrow of mice whole-body exposed to 0, 3, 9, 18, 36, 54 and 72 cGy of 60Co γ-radiation. It was observed that the frequency of micronucleated polychromatic erythrocytes (MPCE) increased with the increase in exposure dose at all the post-irradiation time periods studied. Similarly, the frequency of micronucleated normochromatic erythrocytes (MNCE) also increased with the increase in exposure dose and the increase for both MPCE and MNCE was dose related. The dose-response relationship was linear-quadratic for both MPCE and MNCE. The study of mitotic index revealed that a dose as low as 9 cGy is capable of reducing the mitotic index significantly at 24 h post-irradiation and the dose response was linear-quadratic. However, no significant decline in the mitotic index was observed at 12 and 36 h post-irradiation.",
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Radiation-induced micronucleus formation in mouse bone marrow after low dose exposures. / Jagetia, G. C.; Ganapathi, N. G.

In: Mutation Research - Fundamental and Molecular Mechanisms of Mutagenesis, Vol. 304, No. 2, 16.01.1994, p. 235-242.

Research output: Contribution to journalArticle

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N2 - The incidence of micronucleus formation was studied at 12, 24 and 36 h post-irradiation in the polychromatic (PCE) and normochromatic (NCE) erythrocytes of the bone marrow of mice whole-body exposed to 0, 3, 9, 18, 36, 54 and 72 cGy of 60Co γ-radiation. It was observed that the frequency of micronucleated polychromatic erythrocytes (MPCE) increased with the increase in exposure dose at all the post-irradiation time periods studied. Similarly, the frequency of micronucleated normochromatic erythrocytes (MNCE) also increased with the increase in exposure dose and the increase for both MPCE and MNCE was dose related. The dose-response relationship was linear-quadratic for both MPCE and MNCE. The study of mitotic index revealed that a dose as low as 9 cGy is capable of reducing the mitotic index significantly at 24 h post-irradiation and the dose response was linear-quadratic. However, no significant decline in the mitotic index was observed at 12 and 36 h post-irradiation.

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