Soluble MHC class I molecules in human body fluids.
Level 4 - case-series / case-control
Laboratory and observational study analyzing human fluid samples across cross-sectional and small longitudinal cohorts.
PubMed 7869184 · doi:10.1002/jcla.1860080615
What was done
The authors biochemically characterized and quantified soluble MHC class I molecules (sHLA) in human body fluids, including serum, plasma, urine, cerebrospinal fluid (CSF), and sweat. They used affinity purification and SDS-Western blotting to determine molecular weights and tissue origin (hepatocytes vs. spleen cells), and tracked serum sHLA concentrations across the menstrual cycle in women.
What was found
Affinity-purified serum sHLA molecules ranged in molecular weight from 45 to 21 kD, with Western blot comparisons indicating that the sub-45 kD fraction likely originates from the liver. sHLA was detected and quantified in serum, plasma, urine, and sweat, but was undetectable in CSF (n = 20). Serum sHLA concentrations significantly increased during the first half of the menstrual cycle, an effect that was most pronounced in women positive for HLA-A24. Specific numerical concentrations were not reported in the abstract.
Why it matters
This study demonstrates the systemic distribution and molecular heterogeneity of soluble HLA class I molecules in human excretions and secretions, while highlighting potential endocrine regulation of circulating immune markers across the menstrual cycle.
Limits
The abstract lacks specific quantitative values, variance, and sample sizes for all groups except the CSF cohort (n = 20). Total participant numbers, demographic details, and exact assay methodologies are not provided in the text.
Cited by
- supports Major histocompatibility complex (MHC) molecules are chopped up and secreted in sweat and other bodily fluids.