Characterization of growth hormone-releasing hormone (GHRH) binding to cloned porcine GHRH receptor.

Abstract:

:To study structure-activity relationships of growth hormone-releasing hormone (GHRH), a competitive binding assay was developed using cloned porcine adenopituitary GHRH receptors expressed in human kidney 293 cells. Specific binding of [His1, 125I-Tyr10,Nle27]hGHRH(1-32)-NH2 increased linearly with protein concentration (10-45 micrograms protein/ tube). Binding reached equilibrium after 90 min at 30 degrees C and remained constant for at least 240 min. Binding was reversible to one class of high-affinity sites (Kd = 1.04 +/- 0.19 nM, Bmax = 3.9 +/- 0.53 pmol/mg protein). Binding was selective with a rank order of affinity (IC50) for porcine GHRH (2.8 +/- 0.51 nM), rat GHRH (3.1 +/- 0.69 nM), [N-Ac-Tyr1, D-Arg2]hGHRH(3-29)-NH2 (3.9 +/- 0.58 nM), and [D-Thr7]GHRH(1-29)-NH2 (189.7 +/- 14.3 nM), consistent with their binding to a GHRH receptor. Nonhydrolyzable guanine nucleotides inhibited binding. These data describe a selective and reliable method for a competitive GHRH binding assay that for the first time utilizes rapid filtration to terminate the binding assay.

journal_name

Peptides

journal_title

Peptides

authors

Hassan HA,Hsiung HM,Zhang XY,Smith DP,Smiley DL,Heiman ML

doi

10.1016/0196-9781(95)02026-8

subject

Has Abstract

pub_date

1995-01-01 00:00:00

pages

1469-73

issue

8

eissn

0196-9781

issn

1873-5169

pii

0196978195020268

journal_volume

16

pub_type

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