Guest Post: How does your body know when to go into labor?

Mollyblessingway 011I recently received the following news story to repost. Many women have questions about when they will go into labor or concerns about pre-term labor. They may also worry about “never” going into labor on their own and may face pressure from care providers or family members towards induction. We often rely on signs like cervical changes, contractions, and increased cervical fluid (as well as proximity to due date) in order to help us anticipate the birthing day. I distinctly remember the interesting and counterintuitive experience of having the question of, “WHEN,” somehow feeling more and more mysterious and hard to predict the closer I drew to my own due dates (when really, the closer you get, the fewer birth-day possibilities remain! While it is very normal for babies to be born after their estimated due date, the possible window of when the baby will be born narrows with each day of pregnancy, simply because: babies do come out). Turns out, your baby’s birth-day timing has more to do with what is going on at a molecular level, than what you can observe from the outside!

(If this guest post is too heavy on molecules and too light on personal experience, you might want to check out one of my most popular blog posts: How do I know I’m really in labor? | Talk Birth.)

Key components of interest from the research below:

  • The molecule that triggers birth is the TLR4 molecule.
  • This molecule is activated by other molecules produced in the mothers tissues due to uterine stretch, by proteins that are released from a baby’s lungs just before birth, and by the placenta as it begins to reach the end of its life.
  • Factors that can contribute to a surge inTLR4 and lead to premature birth are:
    • Bacterial infections
    • Damage to the placenta
    • multiple pregnancy

Here is the guest post with more!

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RESEARCHERS at the University of Adelaide have identified that the activation of the TLR4 molecule is key in controlling the timing of birth, acting as a trigger common to both preterm and on-time labour.

Professor Sarah Robertson, Director of the Robinson Research Institute and lead author of the study published this week in Endocrinology, said the research was likely to lead to new therapies in preventing preterm labour.

“Preterm labour, birth at less than 37 weeks gestation, affects 5-13% of pregnancies worldwide. It accounts for 28% of all neonatal deaths and can result in major health consequences for surviving children,” says Professor Robertson.

“In order to prevent preterm birth, we need to understand the physiological responses which lead to normal on-time birth, and our new research pinpoints a ‘master switch’ that influences the timing of birth.

“We know that several agents can bind and trigger the molecule TLR4 after release from fetal and maternal tissues in late gestation, including proteins that are released from a baby’s lungs just before birth.

“Other molecules that activate TLR4 are produced in the mother’s tissues due to uterine stretch, or when the placenta begins to reach the end of its life.”

Professor Robertson says that there are other factors that lead to a surge in TLR4 and premature birth, including local bacteria infections, damage to the placenta due to inflammation, or even multiple pregnancy.

“This is a surprising finding because TLR4 is generally thought to be involved in the immune response to infection, and had not previously been linked with normal processes in pregnancy,” says Professor Robertson.

“Now that we know how critical TLR4 is in regulating the timing of birth, we can commence testing drugs that target the TLR4 pathway.

“While this is yet to be looked at in a clinical setting, we believe this finding will ultimately lead to methods to effectively protect women at risk of going into labour early,” she says.

This work was supported by project and fellowship grants from the National Health and Medical Research Council of Australia, the Canadian Institutes of Health Research and the Australian Research Council.

Key contacts

Professor Sarah Robertson Director, Robinson Research Institute University of Adelaide
08 8313 4094 sarah.robertson@adelaide.edu.au

June 2015 012

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