Recording intelligenceAI-generated brief · check the source for context

Placental Immune Tolerance and Pregnancy Immunology

33:47 recording · AUTO · 2 speakers

Listen to the original

Listen to the episode

Brief overview

Gabrielle Rizzuto studies why a mother's immune system tolerates the genetically foreign placenta instead of rejecting it.

  1. The placenta is a tolerated foreign graftBabies are not a genetic match to their mothers, yet unlike a transplanted organ the placenta is not rejected.
  2. Sugar coating cloaks placental cellsTrophoblasts pile immunosuppressive glycans on their surface proteins, evading strong maternal T and B cell responses much as some pathogens do.
  3. Reproductive health needs more basic scienceAs a pathologist she could see nothing under the microscope to explain a fetal demise, and had nothing to tell the mother.
Executive Summary AI
  • Cindy Leifer introduces Gabrielle Rizzuto, an assistant attending physician and assistant member at Memorial Sloan Kettering Cancer Center in New York City, in an office interview recorded September 12, 2025 for Microbe TV's Immune.0:40
  • The puzzle driving her work: transplanted tissue between two adults is rejected and organs must be well matched, yet babies are not a genetic match to their mothers and are not rejected.1:07
  • Rizzuto found research by accident, taking a work-study job in an HLA immunogenetics lab at Georgetown's medical center in her first year, autoclaving and washing glassware before the lab manager taught her molecular biology and HLA typing; she stayed four years and the PI pushed her toward MD-PhD programs, which she did in the tri-institutional program with a thesis in Alan Houghton's tumor immun4:10
  • During anatomic pathology residency at UCSF she saw a placenta and recognized it as tumor-like and immunologically neglected, then worked on Listeria's exploitation of the pregnant uterus in Anna Mukharjev's lab before joining Adrian Arlebacher's lab for mouse pregnancy immunology.11:57
  • Her key finding is that placental cells decorate their paternally inherited surface proteins with immunosuppressive glycans, a sugar cloaking mechanism similar to what some pathogens use, which keeps maternal T and B cells from mounting a strong response.18:34
  • Now almost three years into her own lab, she studies antibody responses that somehow do not damage the placenta and the extraordinarily rare trophoblast tumors, the only human tumor type where the tumor cell itself is foreign.25:20
Key Quote
“And I saw a placenta and it was like, that's it.”
— Gabrielle Rizzuto11:57
Key Quote
“Certainly one must be that women's health isn't prioritized.”
— Gabrielle Rizzuto12:33
Key Quote
“And I guess like one of the big goals in my career is to get more immunologists excited about doing this because it could be so powerful for learning just how immune cells interact with themselves to put it under a different state.”
— Gabrielle Rizzuto23:29