El-Haddad MA, Ismail Y, Guerra C, Day L, Ross MG. Neuropeptide Y administered into cerebral ventricles stimulates sucrose ingestion in the near-term ovine fetus.
Am J Obstet Gynecol 2003;
189:949-52. [PMID:
14586332 DOI:
10.1067/s0002-9378(03)00840-8]
[Citation(s) in RCA: 15] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
OBJECTIVE
In adults, nutrient intake is controlled by opposing actions of appetite stimulants (eg, neuropeptide Y [NPY]) and suppressors (eg, leptin). Because NPY may exert a preferential role in mediating adult carbohydrate intake, we sought to determine the effect of central NPY on near-term fetal carbohydrate ingestion.
STUDY DESIGN
Five pregnant ewes and fetuses were prepared with fetal vascular, sublingual, and intracerebroventricular catheters, electrocorticogram, and esophageal electromyogram electrodes and studied at 131+/-2 days' gestation. After a 2-hour baseline period, 10% sucrose was infused sublingually for the duration of the study. At 4 hours' time, NPY was injected into the fetal cerebral ventricles and fetal swallowing monitored for an additional 6 hours.
RESULTS
During the basal period, mean (+/-SEM) swallowing averaged 0.8+/-0.1 swallows per minute. Fetal swallowing increased significantly in response to sublingual sucrose (1.3+/-0.1 swallows/min, P=.001), and further significantly increased at 4 to 6 hours after NPY injection into the cerebral ventricles (1.8+/-0.3, P=.001).
CONCLUSION
These results indicate central NPY stimulation of fetal ingestion beyond that resulting from sublingual 10% sucrose. The in utero development of NPY-induced ingestive behavior may be in preparation for high neonatal caloric intake.
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