title: Development of radioimmunoassay for human leptin.
abstract: Using recombinant human leptin, we have produced an antiserum for human leptin and developed a radioimmunoassay (RIA) specific and sensitive for human leptin. We detected leptin-like immunoreactivity (-LI) in culture media of adipose tissue from subcutaneous abdominal fat in human. The plasma leptin-LI concentration in nonobese subjects (17.6 <body mass index (BMI)<23.0) was 5.6 +/- 1.3 (mean +/-SE) ng/ml, while that in obese subjects (29.0 <BMI) was 43.0 +/- 9.4 (mean +/- SE) ng/ml. In gel permeation chromatographic analyses, leptin-LI in culture media and plasma consisted of single component emerging at the elution position of recombinant human leptin. These findings indicate that leptin is secreted from the adipose tissue into the circulating blood as a large molecular form corresponding to recombinant leptin. The RIA developed in the present study will be a powerful tool to investigate the physiological and pathophysiological significance of leptin in human.
authors.affiliation: Department of Medicine and Clinical Science, Kyoto University Graduate School of Medicine, Japan.
authors.forename: K
authors.initials: K
authors.lastname: Hosoda
authors.forename: H
authors.initials: H
authors.lastname: Masuzaki
authors.forename: Y
authors.initials: Y
authors.lastname: Ogawa
authors.forename: T
authors.initials: T
authors.lastname: Miyawaki
authors.forename: J
authors.initials: J
authors.lastname: Hiraoka
authors.forename: I
authors.initials: I
authors.lastname: Hanaoka
authors.forename: A
authors.initials: A
authors.lastname: Yasuno
authors.forename: T
authors.initials: T
authors.lastname: Nomura
authors.forename: Y
authors.initials: Y
authors.lastname: Fujisawa
authors.forename: Y
authors.initials: Y
authors.lastname: Yoshimasa
authors.forename: S
authors.initials: S
authors.lastname: Nishi
authors.forename: Y
authors.initials: Y
authors.lastname: Yamori
authors.forename: K
authors.initials: K
authors.lastname: Nakao
mesh_terms: D000273:Adipose Tissue / Q000378:metabolism; D003470:Culture Media; D018076:DNA, Complementary; D006801:Humans; D020738:Leptin; D009765:Obesity / Q000378:metabolism; D011506:Proteins / Q000378:metabolism*; D011863:Radioimmunoassay; D011994:Recombinant Proteins / Q000378:metabolism
chemical_list: D003470:Culture Media; D018076:DNA, Complementary; D020738:Leptin; D011506:Proteins; D011994:Recombinant Proteins