Effects of prenatal or postnatal ethanol consumption on zinc intestinal absorption and excretion in rats.
Level 5 - mechanism / opinion, no new human data
Preclinical animal study (rats)
PubMed 17068010 · doi:10.1093/alcalc/agl084
What was done
Rats were exposed to chronic ethanol during either pregnancy or lactation. Using a cross-fostering design at birth, offspring were assigned to four groups: untreated controls (CO), ethanol exposure during gestation only (GO), ethanol exposure during lactation only (LO), and pair-fed offspring (PFO). Outcomes evaluated included duodenal zinc absorption at substrate concentrations of 25, 75, and 150 µM, fecal and urinary zinc excretion, pup and maternal serum/milk zinc, and pregnancy outcome metrics.
What was found
Duodenal zinc absorption increased significantly in LO offspring at perfusion medium substrate concentrations of 25, 75, and 150 µM. Fecal zinc excretion was higher in GO pups compared with LO, CO, and PFO groups. Urinary zinc excretion was higher in LO offspring compared with CO, GO, and PFO groups. Pup serum zinc was also increased. Specific numerical values, standard deviations, and p-values were not reported in the abstract.
Why it matters
This study demonstrates that the timing of maternal ethanol exposure (gestation versus lactation) distinctly alters zinc absorption and excretion pathways in rat offspring, indicating different physiological compensatory mechanisms depending on developmental exposure stage.
Limits
The study was conducted in a rodent model and cannot be directly translated to human infants or mothers. The abstract does not provide sample sizes (n for dams or pups), baseline nutritional details, exact numerical data, or statistical dispersion values for the measured outcomes.
Cited by
- partial Alcohol consumption increases urinary zinc excretion by up to twofold.