Compensatory renal growth in uninephrectomized adult mice is growth hormone dependent.

Abstract:

UNLABELLED:Compensatory renal growth in uninephrectomized adult mice is growth hormone dependent. BACKGROUND:Growth hormone (GH) and insulin-like growth factors (IGFs) have been implicated as pathogenic factors in compensatory renal growth (CRG) following unilateral nephrectomy in rodents. CRG in adult rats has been suggested to be GH dependent and GH independent in immature rats. However, the exact role of GH as a regulating or permissive factor in CRG in adult rodents has not been fully resolved to date. METHODS:To elucidate a possible direct, permissive role of GH in CRG, we examined the effect of a newly developed specific GH receptor (GHR) antagonist (G120K-PEG) on kidney IGF-I accumulation and renal/glomerular hypertrophy over seven days after uninephrectomy in adult mice. RESULTS:Placebo-treated uninephrectomized mice were characterized by a transient increase in kidney IGF-I concentration preceding CRG and an increase in glomerular volume. In G120K-PEG-treated uninephrectomized animals, increased kidney IGF-I levels, kidney weight, and glomerular volume were fully abolished. No differences were seen between the two uninephrectomized groups with respect to body weight, food intake, blood glucose, serum GH, IGF-I, or IGFBP-3 levels. CONCLUSIONS:The administration of a GHR antagonist in uninephrectomized adult mice has renal effects without affecting circulating levels of GH/IGFs, indicating that the effect of G120K-PEG may be mediated through a direct inhibitory effect on renal IGF-I accumulation through the renal GHR. This study shows, to our knowledge for the first time, that CRG in adult mice is strictly GH dependent.

journal_name

Kidney Int

journal_title

Kidney international

authors

Flyvbjerg A,Bennett WF,Rasch R,van Neck JW,Groffen CA,Kopchick JJ,Scarlett JA

doi

10.1046/j.1523-1755.1999.00776.x

subject

Has Abstract

pub_date

1999-12-01 00:00:00

pages

2048-54

issue

6

eissn

0085-2538

issn

1523-1755

pii

S0085-2538(15)46541-X

journal_volume

56

pub_type

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