Cited by 586Pancreatic function and diabetesDiabetes and associated disordersGestational Diabetes Research and Management

Serotonin regulates pancreatic beta cell mass during pregnancy

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Kim, Hail, Toyofuku, Yukiko, Lynn, Francis C, Chak, Eric, Uchida, Toyoyoshi, Mizukami, Hiroki, Fujitani, Yoshio, Kawamori, Ryuzo +11 more·2010·Nature Medicine

Abstract

During pregnancy, the energy requirements of the fetus impose changes in maternal metabolism. Increasing insulin resistance in the mother maintains nutrient flow to the growing fetus, whereas prolactin and placental lactogen counterbalance this resistance and prevent maternal hyperglycemia by driving expansion of the maternal population of insulin-producing beta cells. However, the exact mechanisms by which the lactogenic hormones drive beta cell expansion remain uncertain. Here we show that serotonin acts downstream of lactogen signaling to stimulate beta cell proliferation. Expression of serotonin synthetic enzyme tryptophan hydroxylase-1 (Tph1) and serotonin production rose sharply in beta cells during pregnancy or after treatment with lactogens in vitro. Inhibition of serotonin synthesis by dietary tryptophan restriction or Tph inhibition blocked beta cell expansion and induced glucose intolerance in pregnant mice without affecting insulin sensitivity. Expression of the Gαq-linked serotonin receptor 5-hydroxytryptamine receptor-2b (Htr2b) in maternal islets increased during pregnancy and normalized just before parturition, whereas expression of the Gαi-linked receptor Htr1d increased at the end of pregnancy and postpartum. Blocking Htr2b signaling in pregnant mice also blocked beta cell expansion and caused glucose intolerance. These studies reveal an integrated signaling pathway linking beta cell mass to anticipated insulin need during pregnancy. Modulators of this pathway, including medications and diet, may affect the risk of gestational diabetes.

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  • In animal studies, β-cell proliferation occurs during pregnancy via prolactin receptor-STAT5-serotonin-HTR2B activation.

    “In animal studies, β-cell proliferation occurs during pregnancy via prolactin receptor-STAT5-serotonin-HTR2B activation [80].”

    From Gestational Diabetes Mellitus: Diagnostic Approaches and Maternal-Offspring Complications (2022) · cites this paper as [80]

    The paper reports that prolactin induces Tph1 in mouse islets and that serotonin signaling through Htr2b stimulates β-cell proliferation during pregnancy (passages labeled Abstract; Fig. 4a and 4h). It mentions increased prolactin-receptor signaling, but our copy does not establish STAT5 as a step in this pathway. (LLM, conf=0.88)

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Authors
Kim, H., Toyofuku, Y., Lynn, F. C., Chak, E., Uchida, T., Mizukami, H., Fujitani, Y., Kawamori, R., Miyatsuka, T., Kosaka, Y., Yang, K., Honig, G., van der Hart, M., Kishimoto, N., Wang, J., Yagihashi, S., Tecott, L. H., Watada, H., & German, M. S.
Affiliations
  • University of California, San Francisco (US)
  • Juntendo University (JP)
  • University of British Columbia (CA)
  • Hirosaki University (JP)
Corresponding author
German, Michael S
Venue
Nature Medicine
Published
2010-06-27
Volume
16
Issue
7
Pages
804-808
ISSN
  • 1078-8956 (ISSN-L)
  • 1546-170X
OpenAlex
W2051567027
Cited by
586
References
30
Citations by year
2026: 19 · 2025: 32 · 2024: 36 · 2023: 29 · 2022: 49 · 2021: 41 · 2020: 34 · 2019: 44 · 2018: 43 · 2017: 47 · 2016: 39 · 2015: 38 · 2014: 37 · 2013: 30 · 2012: 39
FWCI
32.69
Type
journal article
Language
en
Open access
Locations
  • Nature Medicine (publishedVersion)
  • PubMed (publishedVersion)
  • PubMed Central (acceptedVersion)
  • eScholarship (California Digital Library) (submittedVersion)
Funders
National Institute of Diabetes and Digestive and Kidney Diseases (U19DK061245, R01DK021344, P30DK063720)
Topics
  • Health Sciences › Medicine › Surgery › Pancreatic function and diabetes
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Diabetes and associated disorders
  • Health Sciences › Medicine › Obstetrics and Gynecology › Gestational Diabetes Research and Management
Keywords
serotonin, pancreatic beta cells, beta-cell mass, pregnancy, prolactin, placental lactogen, tryptophan hydroxylase 1, HTR2B, impaired glucose tolerance, gestational diabetes mellitus, insulin resistance, maternal metabolism
MeSH terms
Animals, Female, Glucose, Insulin, Islets of Langerhans, Mice, Inbred C57BL, Placental Lactogen, Pregnancy, Pregnancy, Animal, Prolactin, Serotonin, Tryptophan Hydroxylase, Gene Expression Profiling, Insulin-Secreting Cells, Mice

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