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Substance Name: Placental lactogen ii
RN: 9035-54-5


  • A polypeptide hormone of approximately 25 kDa that is produced by the SYNCYTIOTROPHOBLASTS of the PLACENTA, also known as chorionic somatomammotropin. It has both GROWTH HORMONE and PROLACTIN activities on growth, lactation, and luteal steroid production. In women, placental lactogen secretion begins soon after implantation and increases to 1 g or more a day in late pregnancy. Placental lactogen is also an insulin antagonist.

Molecular Formula

  • Unspecified
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Names and Synonyms

Name of Substance

  • Placental lactogen
  • Placental lactogen II

MeSH Heading

  • Placental lactogen


  • Choriomammotropin
  • Chorionic growth hormone-prolactin
  • Chorionic somatomammotropin, human
  • Chorionic somatomamnotropin
  • Lactogen hormone, placental
  • Lactogenic hormone, placental
  • Lactosomatic hormone
  • Lactosomatotropic hormone
  • Mammotropic hormone, placental
  • Papp-D
  • Placental lactogen
  • Placental lactogen II
  • Placental lactogen-2
  • Placental lactogenic hormone
  • Somatomammotropic hormone
  • Somatomammotropin
  • Somatomammotropin, chorionic

Systematic Name

  • Lactogen, placental

Registry Numbers

CAS Registry Number

  • 9035-54-5

System Generated Number

  • 0009035545