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Biomed Environ Sci. 2014 Jan;27(1):27-34. doi: 10.3967/bes2014.005.

Role of PLC-PIP2 and cAMP-PKA signal pathways in radiation-induced immune-suppressing effect.

Author information

1
Ministry of Health Key Laboratory of Radiobiology, Jilin University, Changchun 130021, Jilin, China.
2
Department of Radiation Oncology, China-Japan Union Hospital of Jilin University, Changchun 130033, Jilin, China.
3
Department of Orthopedics, First Hospital of Jilin University, Changchun 130021, Jilin, China.

Abstract

OBJECTIVE:

The purpose of the present study was to observe the changes in CD4+CD25+Nrp1+Treg cells after irradiation with different doses and explore the possible molecular mechanisms involved.

METHODS:

ICR mice and mouse lymphoma cell line (EL-4 cells) was used. The expressions of CD4, CD25, Nrp1, calcineurin and PKC-α were detected by flow cytometry. The expressions of TGF-β1, IL-10, PKA and cAMP were estimated with ELISA.

RESULTS:

At 12 h after irradiation, the expression of Nrp1 increased significantly in 4.0 Gy group, compared with sham-irradiation group (P<0.05) in the spleen and thymus, respectively, when ICR mice received whole-body irradiation (WBI). Meanwhile the synthesis of Interleukin 10 (IL-10) and transforming growth factor-β1 (TGF-β1) increased significantly after high dose irradiation (HDR) (> or = 1.0 Gy). In addition, the expression of cAMP and PKA protein increased, while PKC-α, calcineurin decreased at 12h in thymus cells after 4.0 Gy X-irradiation. While TGF-β1 was clearly inhibited when the PLC-PIP2 signal pathway was stimulated or the cAMP-PKA signal pathway was blocked after 4.0 Gy X-irradiation, this did not limit the up-regulation of CD4+CD25+Nrp1+Treg cells after ionizing radiation.

CONCLUSION:

These results indicated that HDR might induce CD4+CD25+Nrp1+Treg cells production and stimulate TGF-β1 secretion by regulating signal molecules in mice.

KEYWORDS:

Ionizing radiation; Neuropilin-1 (Nrp1); Regulatory T cells; Signal molecule

PMID:
24553371
DOI:
10.3967/bes2014.005
[Indexed for MEDLINE]
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