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Accordingly, we have studied the response of plasma CNP forms to acute catabolic (caloric restriction) and anabolic [growth hormone (GH) stimulation] interventions in lambs and related the findings to circulating IGF-I levels, growth velocity, and markers of bone formation. Lambs fed a reduced caloric intake (25% of normal) for 6 days exhibited reduced live weight, plasma urea, and IGF-I ( P &lt; 0.001 for all) compared with control lambs. Basal levels of NT-proCNP (40.1 \u00b1 0.9 pmol\/l) fell promptly to a nadir (28.1 \u00b1 0.8 pmol\/l, P &lt; 0.001) on day 6, returning rapidly to basal levels upon refeeding. Although plasma alkaline phosphatase (ALP) fell ( P &lt; 0.001), reductions in metacarpal growth velocity were not significant within the 12-day period of study. In contrast to caloric restriction, long-acting bovine recombinant GH (2.5 mg\/kg on days 0 and 6), as expected, increased plasma IGF-I more than twofold above control for 12 days ( P &lt; 0.001). Growth velocity did not differ during the 30 days of observation, and, consistent with unchanged growth velocity, plasma NT-proCNP and ALP were also unaffected. In conclusion, CNP synthesis and markers of bone formation are acutely sensitive to catabolism but unaffected by doses of GH that fail to stimulate skeletal growth. <\/jats:p>","DOI":"10.1152\/ajpendo.00469.2006","type":"journal-article","created":{"date-parts":[[2007,1,16]],"date-time":"2007-01-16T22:19:12Z","timestamp":1168985952000},"page":"E1395-E1400","source":"Crossref","is-referenced-by-count":19,"title":["Response of plasma CNP forms to acute anabolic and catabolic interventions in growing lambs"],"prefix":"10.1152","volume":"292","author":[{"given":"Timothy C. 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