Pregnancy can be suspended

  In modern society, people often need to take contraceptive measures in the relationship between men and women in order to plan their lives. Fundamentally speaking, human contraception is to prevent two processes-the first is to prevent the sperm and egg from combining. Condoms are the commonly used contraceptives at this stage; if this process cannot be effectively prevented, then early embryos must be prevented. Bed and taking contraceptives are commonly used methods at this stage.
  Once the early embryo is implanted, the woman will enter the pregnancy process. At this time, even taking contraceptives is useless. Pregnancy in October, once delivery, no one can stop this process, unless abortion, and this is a great harm to women.
  However, what we humans cannot prevent is nothing to some animals, because they can suspend pregnancy! You don’t have to do everything possible to prevent fertilization, but you can control the process of pregnancy-you can get pregnant whenever you want, and you can accurately control the birth time of your child to avoid the trouble caused by pregnancy. This skill really makes us humans envious. What is going on?
  According to investigations, some marsupials and more than 130 species of mammals can suspend pregnancy. For many animals, early embryos will be implanted at a specific time, implanted in the mother’s uterus, and gradually nourished into babies. But for the above-mentioned animals that can suspend pregnancy, they can make the early embryos dormant like seeds, while in the mother’s uterus but temporarily unable to implant. Scientists call this phenomenon “embryonic diapause.” It is not until the mother secretes certain molecular regulators that these dormant embryos are awakened and implanted to continue their development. For wild animals, “embryo diapause” is a biological strategy. When faced with conditions that are not conducive to maintaining the growth of the newborn, such as insufficient food, insufficient maternal fat storage, or the existence of older siblings who have not been weaned, animal mothers will delay the pregnancy process.
  Bears, armadillos, seals, otters, and some animals like weasels often experience seasonal delays during the reproductive cycle. Take bears as an example. Many types of bears mate in late spring or early summer, but female bears do not choose to implant embryos directly. The female bear will eat frantically, and when she gains weight a few months later, and has enough fat, she will implant one or more embryos into the uterus. Bear cubs are generally arranged to be born at the end of winter and early spring, so that the newborn bear cubs will not face the winter environment of food shortage.
  However, how the process of embryonic diapause is realized at the molecular level is still a mystery. Scientists still don’t know what kind of signal is transmitted between the early embryo and the uterus, or how the signal is transmitted. At present, scientists have conducted in-depth analysis on the phenomenon of embryonic diapause, and have achieved some preliminary results. This research will inspire future cancer treatments-if we master how to hypnotize and wake up cells, we can put cancer cells into a dormant state, which will help the progress of chemotherapy. It is also possible to make the cancer cells in the most active state as much as possible when a certain drug takes effect, so that the drug can effectively kill it in a short time.
  Some people may ask, can humans achieve “embryo diapause”? This is unlikely because humans cannot perceive when they have formed an early embryo. Of course, with the deepening of research and technological breakthroughs in the future, scientists may be able to help mankind realize this dream.