Heparin prevents inflammation-induced pregnancy loss in mice through its anti-inflammatory effects
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ID: 328044
2026
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Abstract
Excessive inflammation at the feto-maternal interface is a major contributor to adverse pregnancy outcomes, including miscarriage and preterm birth. Heparin, which is widely used as an anticoagulant, has also been recognized as possessing anti-inflammatory properties; however, its role in inflammation-driven pregnancy complications remains unclear. In this study, we examined whether unfractionated heparin prevents inflammation-induced miscarriage and preterm birth in mice. Lipopolysaccharide-induced murine models were used to mimic inflammation-driven pregnancy complications. Pregnant C57BL/6 mice were administered lipopolysaccharide to induce miscarriage or preterm birth, with or without unfractionated heparin treatment. Immunological, histological, and ex vivo analyses were performed to evaluate inflammatory responses and tissue integrity at the feto-maternal interface. Unfractionated heparin markedly reduced both miscarriage rates and the incidence of preterm birth. It decreased the M1/M2 macrophage ratio and suppressed the production of proinflammatory cytokines, including interleukin-12 and tumor necrosis factor-alpha. Unfractionated heparin also reduced interferon-gamma production by T and natural killer T cells, and downregulated Tbx21 expression in decidual tissues, indicating the attenuation of a proinflammatory immune environment. These protective effects were observed without substantial changes in coagulation parameters. Ex vivo experiments further showed that unfractionated heparin directly suppressed lipopolysaccharide-induced interleukin-12 production by decidual macrophages. Collectively, these findings indicate that unfractionated heparin prevents inflammation-induced miscarriage and preterm birth by modulating immune responses at the feto-maternal interface, independent of its anticoagulant activity.
| Reference Key |
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| Authors | Tomoko Ichikawa, Yasuyuki Negishi, Takami Watanabe, Etsuko Toda, Mika Terasaki, Satoko Nakamura, Mitsuki Murofushi, 浅利真司, Yuki Kaito, Asako Watanabe, Aya Ono, Toshiyuki Takeshita, Rimpei Morita, Yoshimitsu Kuwabara |
| Journal | molecular human reproduction |
| Year | 2026 |
| DOI |
10.1093/molehr/gaag052
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| URL | |
| Keywords | Keywords not found |
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