Effect of postnatal age anti a beta(3)-adrenergic agonist (Zeneca D7114) administration on uncoupling protein-1 abundance in the lamb

We examined the effect of time after birth and beta (3)-adrenergic agonist (Zeneca D7114) administration on uncoupling protein-1 (UCP1) abundance and thermoregulation in the lamb. Forty twin lambs, all born normally at term, were maintained at a cold ambient temperature of between 3 and 8 degreesC. At 0.5, 1.75, 5.25, 11.25 and 23.25 h after birth eight sets of twins were fed 20 ml of formula milk +/- 10 mg kg(-1) of beta (3)-adrenergic agonist, and 45 min after feeding brown adipose tissue (BAT) was sampled. Colonic te mperature was measured and BAT analysed for UCP1 abundance, GDP-binding to mitochondrial protein (i.e. thermogenic activity) and catecholamine content . Colonic temperature declined between 1.25 and 6 h from 40.2 degreesC to 3 9.2 degreesC and then increased to 39.8 degreesC at 12 h, but increased aft er feeding at all ages. UCP1 abundance increased from 1.25 h after birth, t o peak at 2 h after birth in controls, compared with 6 h after birth in bet a (3)-adrenergic agonist-treated lambs. The level of GDP-binding to mitocho ndrial protein did not change significantly with age but was increased by b eta (3)-adrenergic agonist treatment. The noradrenaline (norepinephrine) co ntent of BAT increased between 1.25 and 12 h after birth, irrespective of b eta (3)-adrenergic agonist administration. The total weight of perirenal BA T plus its lipid, protein and mitochondrial protein content declined over t he first 6 h of life. UCP1 development continues over the first 24 h of neo natal life, and can be manipulated by beta (3)-adrenergic agonist administr ation. This may represent one method of improving thermoregulation in newbo rn lambs.