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Relaxing Into the Hormone RELAXIN

RELAXIN is still a bit of a mysterious hormone, in that it hasn’t been researched to the degree of other physiologic things that influence humans. However, during pregnancy, the influence of RELAXIN hormone is understood far more for this is the time the levels are at their highest. In humans who are born biologically female, RELAXIN hormone comes from the ovaries in tiny amounts throughout life. During pregnancy this hormone is also released by the placenta in significant amounts, as well as from cells of the bag of waters around the baby, and the cells lining of the growing uterus. For those who are born biologically male, RELAXIN hormone is secreted from the prostate and can be detected in…

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 Peptide hormone relaxin: from bench to bedside

The peptide hormone relaxin has numerous roles both within and independent of pregnancy and is often thought of as a “pleiotropic hormone.” Relaxin targets several tissues throughout the body, and has many functions associated with extracellular matrix remodeling and the vasculature. This review considers the potential therapeutic applications of relaxin in cervical ripening, in vitro fertilization, preeclampsia, acute heart failure, ischemia-reperfusion, and cirrhosis.

 Unveiling the Vasodilatory Actions and Mechanisms of Relaxin

More recent understanding of relaxin as a vasodilatory hormone has stemmed, in part, from investigations of the maternal renal and cardiovascular adaptations to pregnancy, in which relaxin is emerging as an important player.

Articles of Interest

Everything we know about the human relaxin peptide family

The human relaxin peptide, also known as relaxin-2 (RLN2), is a 6kDa polypeptide hormone that is 48 amino acids in length. It was first discovered in 1926 by Frederick Hisawand and belongs to a wider collection of polypeptides called the relaxin peptide family. All seven family members are critical to drug development and play a clinically significant role in health and disease.

Relaxin Hormone in Pregnancy: How This Powerful Hormone Prepares Your Body for Birth

he pregnancy ordeal is a wonderful symphony of hormones that changes your body to foster and give birth to new life. The most remarkable of these hormones is the relaxin, but this particular hormone has a different role, which is that it actually makes your body relax. Whether you are tightening your ligaments or getting your pelvis ready to deliver a baby, relaxin keeps you as flexible as you need to be.

Relaxin – Friend or Foe During Pregnancy?

Relaxin’s most valuable effect on ligaments is of course to the pelvic girdle (which is the pubic symphysis or joint at the front of the pelvis and the two sacroiliac joints at the back of the pelvis). These pelvic joints need to be hyper-mobile to allow for the passage of the baby during childbirth. Unfortunately, these pelvic joints don’t just loosen up right before your due date.

Bioethics and Patent Law: The Relaxin Case

The central debate on bioethics and IP revolves around the morality of what is loosely referred to as patenting life. This is not new. Back in 1873 Louis Pasteur received a patent on isolated yeast, a living organism. Debate intensified from the 1980s onward, when patents began to be filed on human genes. The jurisprudence of the EPO offers a more recent illustration of legal and ethical concerns about patenting genes. In question was a patent for relaxin, a hormone which relaxes the uterus during childbirth, and which, it was hoped, could have medical application in reducing the need for caesarean deliveries in difficult pregnancies.

Estrogen, Relaxin, and the Real Story of Pelvic Floor Health

We explore the nuance behind pelvic floor health, how hormones like estrogen and relaxin play a role, and why strengthening alone isn’t always the answer. If you’re a clinician or someone curious about the science behind pelvic health, this conversation is packed with insight.

Pregnancy hormone makes the heart race

Relaxin, a hormone thought to be important only during pregnancy, may have a more general function in the the body. According to researchers in Australia, the hormone may affect a person’s heart rate whether they are pregnant or not. Relaxin is produced mainly in the ovary by the corpus luteum. During pregnancy, it inhibits spontaneous contractions of the uterus, and makes delivery easier by softening the cervix and elongating the pubic ligament. In 1990, scientists discovered relaxin’s effect on the heart after injecting anaesthetised rats with relaxin from pigs. They found not only that the hormone increased the rats’ heart rate, but that there are specific binding sites for the hormone in the animals’ heart muscle (atrial myocardium).

Relaxin - the wobbly hormone

When you’re not pregnant, you still have relaxin in your body. Relatively low levels rise after ovulation and fall again if you do not get pregnant. BUT relaxin has beneficial effects upon the endometrium which are responsible for establishment of pregnancy. At a biochemical level, it stimulates structural changes in the endometrial cells and the surrounding tissue. It increases the concentration of local immune cells which are required for implantation. This basically means that it prepares the lining of the uterus for pregnancy. That was too sciencey – but it helps make a baby – after the sex part.

Relaxin as a New Hormone

RELAXIN was described as a hormone some 55 years ago but despite some persistent pioneering work, passed into relative obscurity for a long period of time. The present status of relaxin is such that it directly impinges on reproductive endocrinology and perhaps on those endocrinologists who appreciate that connective tissue metabolism is controlled by hormones and who wish to share in the task of refurbishing a hormone long left on the shelf.

Stop Blaming Relaxin Hormone for your Pregnancy Aches and Pains!

Relaxin peaks between 12 to 16 weeks of pregnancy. That is basically in your 1st trimester of pregnancy! Most women experience aches in pains in the late 2nd trimester or 3rd trimester, which is when relaxin is at its lowest! So, it can't be relaxin that is causing your pubic bone to separate and be unstable! During pregnancy, estrogen levels rise. Estrogen is a growth hormone and increases the size of your uterus, breasts, vascular supply, mucosal lining, and muscles. The breasts can increase up to 500 grams. Due to this significant increase in ANTERIOR weight, the body has to work harder to support this load, possibly putting more load and stress on joints and muscles, causing aches and pains.

The effect of relaxin on the musculoskeletal system

Relaxin is a hormone structurally related to insulin and insulin-like growth factor, which exerts its regulatory effect on the musculoskeletal and other systems through binding to its receptor in various tissues, mediated by different signaling pathways. Relaxin alters the properties of cartilage and tendon by activating collagenase. This hormone is also involved in bone remodeling and healing of injured ligaments and skeletal muscle.

The hormone relaxin

Schauberger et al (1996) conducted a study that looked at whether or not joint laxity correlated with levels of relaxin. Interestingly, although there was a significant increase in joint laxity over the course of pregnancy and postpartum, none of these actually correlated with serum relaxin levels. Kristiansson et al (1996) conducted a study to look at back pain during pregnancy and whether this correlated with the relaxin hormone. They found that relaxin peaks at 12 weeks of pregnancy and reduces back down to 50% of this level by 17 weeks.

Understanding Relaxin: How This Powerful Hormone Affects the Body During Pregnancy and Postpartum

Basically, its primary role is to relax ligaments and soften connective tissue so the pelvis can expand and accommodate a growing baby—and eventually, birth.

Understanding Relaxin: Why It Doesn’t Cause Pain in Pregnancy

Relaxin is a regulatory hormone involved in growth, metabolism, and tissue remodeling after an injury to our bones, ligaments, muscles or tendons (Dehghan 2014). During pregnancy, Relaxin levels begin to increase in the first trimester to help the body prepare for childbirth by relaxing the ligaments in the pelvis and softening the cervix. Relaxin is a vital hormone that plays a significant role in preparing the body for childbirth, but it does not cause pain. The discomforts experienced during pregnancy are often a result of multiple factors: physical changes, weight gain, and other hormonal changes.

What happens to your brain when you’re pregnant – clumsiness, food cravings, and moodiness?

But what explains klutziness in early pregnancy? During the first few weeks, levels of a hormone called relaxin rise rapidly. Like the name suggests, relaxin relaxes the body’s joints, ligaments and muscles, which is especially useful in helping stretch the pelvic region during delivery.

When “Relaxin” Can Be Disturbing

One of these hormones, relaxin, causes a loosening of the ligaments, the structures in the body that keep bones securely connected to one another. On the one hand, this ligament laxity is important because it allows for widening of the pelvic bones in order to allow room for the fetus to grow, develop, and eventually emerge from the mother. However, just like chocolate cake, too much of anything, even something good, can actually be harmful. If there is too much ligament laxity, the pelvic bones may move out of alignment and the pubic bones may separate from one another which can be very painful.

Why is the Hormone Relaxin Important to Massage?

Relaxin is a reproductive hormone that was originally identified in 1926 as a hormone that causes relaxation of the pubic ligaments. Subsequent studies have identified several functions of the hormone, some of which are important to massage therapy. Therapists trained in pregnancy massage understand that deep tissue techniques are contraindicated. Meaning that lighter techniques need to be used during pregnancy due to the presence of relaxin. However, relaxin is not just a pregnancy hormone and impacts our lives in other ways.

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You and Your Hormones

The effects of relaxin are most well-described during the female reproductive cycle and pregnancy. Relaxin levels in the circulation rise after ovulation, during the second half of the menstrual cycle. At this stage it is thought to relax the wall of the uterus by inhibiting contractions, and it also prepares the lining of the uterus for pregnancy. If pregnancy does not occur, relaxin levels drop again.