Synthetic preimplantation factor attenuated radiation-induced heart injury in rats

Researchers investigated whether synthetic preimplantation factor (sPIF) could mitigate radiation-induced heart disease in rats and affect proliferation in human breast cancer cells. Preimplantation factor is an embryonic immunomodulatory peptide.

Study design

Adult male Sprague-Dawley rats were allocated to three groups: vehicle-treated control, irradiation with vehicle treatment, and irradiation with sPIF treatment. Heart-focused irradiation was delivered at 50 Gy; monitoring took place at 1, 3, and 15 weeks. Assessments included transthoracic echocardiography, histopathology, and molecular analyses of left ventricular samples.

Key findings

• At week 3, sPIF decreased the expression of inflammatory markers in the left ventricle.
• At week 15, it attenuated radiation-induced left ventricular hypertrophy and fibrosis and reduced nitrotyrosine accumulation.
• In H9c2 cardiomyoblasts, sPIF suppressed angiotensin II-induced hypertrophy; in human ventricular cardiac fibroblasts, it inhibited transforming growth factor-β1-induced collagen-1 expression.
• In human breast carcinoma cells, sPIF enhanced the anti-proliferative response to irradiation.

The authors consider sPIF a potential cardioprotective agent and emphasize the need for further mechanistic investigations. The abstract provides neither quantitative estimates of effect sizes nor a separate description of study limitations.