Uteroglobin

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Uteroglobin (SCGB1A1): a small, secreted protein of the lungs

What it is
- Uteroglobin is a small protein in mammals, also known as secretoglobin family 1A member 1 (SCGB1A1). It forms a disulfide‑bridged dimer and is the founder member of the secretoglobin family.

Where it’s made
- In humans, SCGB1A1 is produced mainly by club cells in the lungs (airways).

Other names
- Uteroglobin, UG or UGB; Clara cell secretory protein (CCSP); CC10; blastokinin; among many others.

What it does (what scientists think)
- The exact function isn’t fully known, but possible roles include:
- Modulating immune responses in the airways (immunomodulation)
- Binding lipids and phospholipids (for example, phosphatidylcholine and phosphatidylinositol)
- Inhibiting phospholipase A2 activity in lab experiments
- Interacting with fibronectin, which may relate to immune and kidney processes in some animal studies
- It’s a secreted, disulfide-bonded dimer found mainly in respiratory tissues, but related expression has been noted in other tissues in some species.

Genetics and evolution
- SCGB1A1 is the human gene encoding uteroglobin. It is the first known member of the secretoglobin family and is specific to mammals.

What studies in animals and humans suggest
- Animal studies:
- Mice lacking uteroglobin can develop kidney problems similar to Goodpasture’s syndrome in some genetic backgrounds, possibly related to fibronectin binding by IgA.
- Different mouse strains show varied responses to respiratory challenges when uteroglobin is absent, including changes in inflammatory markers and club cell structure.
- Uteroglobin can bind polychlorinated biphenyls (PCBs), linking it to chemical exposure responses.
- Human studies:
- Polymorphisms in the uteroglobin gene have been investigated for associations with diseases such as asthma and IgA nephropathy, but results are not consistently proven.

Why it matters
- Uteroglobin is a small, secreted protein in the lungs with potential anti-inflammatory and lipid‑binding roles. Understanding its function could shed light on lung health and diseases involving inflammation, as well as how certain exposures affect the immune system in the airways.

In short
- Uteroglobin (SCGB1A1) is a secreted lung protein important for airway biology. Its exact roles are still being studied, but it may help regulate immune responses and interact with lipids, with animal studies suggesting possible links to kidney and respiratory conditions.