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The liver, an essential organ in the human body, performs over 200 vital functions that can be broadly categorized into metabolic, hematological, endocrine regulation, and bile production.
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The liver is an important organ in vertebrates that plays an essential role in metabolism. It is also responsible for storing and redistributing nutrients such as carbohydrates, fats, and vitamins in the body. Additionally, the liver releases bile salts which are critical for digesting food and eliminating toxic metabolites from the body.
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In clinical practice, the direct measurement of hepatic blood flow to evaluate liver function presents significant challenges due to the intricate and specialized nature of the necessary techniques. Consequently, healthcare professionals often rely on empirical estimates derived from thorough patient examinations and liver function tests to gauge liver health. Among the tools at their disposal, the Child–Pugh and MELD scoring systems stand out for their ability to categorize and assess...
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In pediatric care, understanding the nuances of hepatic drug metabolism is crucial, as it significantly differs from that of adults. This divergence is primarily due to the developmental stage of drug-metabolizing enzymes, which affects how medications are processed in the body. In neonates, for instance, the activity of Phase I enzymes—critical for the initial breakdown of drugs—is markedly reduced, functioning at just 20–40% of the levels seen in adults. This reduction poses...
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The biliary system of the liver, crucial for bile secretion and drug excretion, comprises intrahepatic bile ducts that merge to form the common hepatic duct. This duct, carrying hepatic bile, combines with the cystic duct, draining the gallbladder and forming the common bile duct, which empties into the duodenum. Bile, produced by hepatic cells lining the bile canaliculi, is composed primarily of water, bile salts, pigments, electrolytes, and lesser amounts of cholesterol and fatty acids. Bile...
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Related Experiment Video

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Partial Lobular Hepatectomy: A Surgical Model for Morphologic Liver Regeneration
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Pregnancy and weaning regulate human maternal liver size and function.

Alexandra Q Bartlett1, Kimberly K Vesco2, Jonathan Q Purnell3

  • 1Department of Cell, Developmental, and Cancer Biology, Oregon Health & Science University, Portland, OR 97239.

Proceedings of the National Academy of Sciences of the United States of America
|November 24, 2021
PubMed
Summary

The human liver grows during pregnancy and shrinks after weaning, independent of weight gain. This reproductive regulation of liver size may influence liver diseases and breast cancer outcomes.

Keywords:
bile acidslivermaternal healthpregnancy

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Area of Science:

  • Reproductive biology
  • Hepatology
  • Oncology

Background:

  • Rodent liver growth during pregnancy is followed by involution after weaning, creating a pro-metastatic niche.
  • This suggests a potential mechanism for increased liver metastasis in women after childbirth.
  • Human liver changes during pregnancy and weaning remain largely uncharacterized.

Purpose of the Study:

  • To investigate whether the human liver changes in size and function during pregnancy and after weaning.
  • To explore the role of bile acids in human liver growth and regression during the reproductive cycle.

Main Methods:

  • Abdominal imaging was used to measure liver size in healthy women at early pregnancy, late pregnancy, and postweaning.
  • Glucose metabolism (production and utilization) and circulating bile acid levels were assessed during pregnancy.

Main Results:

  • The majority of women exhibited liver size increase during pregnancy, returning to baseline postweaning, irrespective of overall weight gain.
  • Bile acids showed potential roles in regulating liver growth and regression.
  • Liver function, including glucose metabolism, was monitored throughout the study.

Conclusions:

  • The human liver's size is regulated by reproductive state, with growth during pregnancy and volume loss postweaning.
  • These findings suggest implications for understanding sex-specific liver diseases.
  • The study supports a link between reproductive status, liver changes, and potential impacts on breast cancer outcomes.