Abstract
The Milan hypertensive strain of rat (MHS) displays abnormalities in both renal function and adrenocortical activity. While the pressor role of the former has been studied in detail, the role of the latter has not yet been clearly evaluated. In the present study, glucocorticoid receptor (GR) binding characteristics in liver cytosol from adult MHS and Milan normotensive controls (MNS) have been investigated. Dexamethasone, aldosterone and corticosterone were bound with lower affinity to cytosol of MHS rats compared with that of MNS rats. This pattern of binding could explain the raised plasma corticosterone concentrations and adrenocortical hypertrophy previously noted in MHS. The coding sequence of MHS and MNS GR genes have been determined. The MHS gene differed in four respects from that of MNS: three silent point mutations and a polymorphic microsatellite region in exon 2. The latter polymorphism has been used in cosegregation studies of F2 hybrids of MHS x MNS. The MHS GR genotype was associated with hypercalciuria and lower blood pressure in female rats and lower body weight in male rats. Although the effect on blood pressure is small, it is consistent with the affinity data. MHS GR genotype cosegregated with lower blood pressure in F2 rats and displayed a lower affinity in binding studies. In conclusion, GR polymorphism may be responsible for differences of adrenocortical function between MHS and MNS. This may lead to a reduction in the blood pressure difference between the two strains.
| Original language | English |
|---|---|
| Pages (from-to) | 41-50 |
| Number of pages | 10 |
| Journal | Journal of Molecular Endocrinology |
| Volume | 21 |
| Issue number | 1 |
| DOIs | |
| Publication status | Published - Aug 1998 |
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ASJC Scopus subject areas
- Endocrinology
Cite this
Glucocorticoid receptor polymorphism in genetic hypertension. / Kenyon, C. J.; Panarelli, M.; Zagato, L.; Torielli, L.; Heeley, R. P.; Holloway, C. D.; Fraser, R.; Casari, G.; Sutcliffe, R. G.; Bianchi, G.
In: Journal of Molecular Endocrinology, Vol. 21, No. 1, 08.1998, p. 41-50.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Glucocorticoid receptor polymorphism in genetic hypertension
AU - Kenyon, C. J.
AU - Panarelli, M.
AU - Zagato, L.
AU - Torielli, L.
AU - Heeley, R. P.
AU - Holloway, C. D.
AU - Fraser, R.
AU - Casari, G.
AU - Sutcliffe, R. G.
AU - Bianchi, G.
PY - 1998/8
Y1 - 1998/8
N2 - The Milan hypertensive strain of rat (MHS) displays abnormalities in both renal function and adrenocortical activity. While the pressor role of the former has been studied in detail, the role of the latter has not yet been clearly evaluated. In the present study, glucocorticoid receptor (GR) binding characteristics in liver cytosol from adult MHS and Milan normotensive controls (MNS) have been investigated. Dexamethasone, aldosterone and corticosterone were bound with lower affinity to cytosol of MHS rats compared with that of MNS rats. This pattern of binding could explain the raised plasma corticosterone concentrations and adrenocortical hypertrophy previously noted in MHS. The coding sequence of MHS and MNS GR genes have been determined. The MHS gene differed in four respects from that of MNS: three silent point mutations and a polymorphic microsatellite region in exon 2. The latter polymorphism has been used in cosegregation studies of F2 hybrids of MHS x MNS. The MHS GR genotype was associated with hypercalciuria and lower blood pressure in female rats and lower body weight in male rats. Although the effect on blood pressure is small, it is consistent with the affinity data. MHS GR genotype cosegregated with lower blood pressure in F2 rats and displayed a lower affinity in binding studies. In conclusion, GR polymorphism may be responsible for differences of adrenocortical function between MHS and MNS. This may lead to a reduction in the blood pressure difference between the two strains.
AB - The Milan hypertensive strain of rat (MHS) displays abnormalities in both renal function and adrenocortical activity. While the pressor role of the former has been studied in detail, the role of the latter has not yet been clearly evaluated. In the present study, glucocorticoid receptor (GR) binding characteristics in liver cytosol from adult MHS and Milan normotensive controls (MNS) have been investigated. Dexamethasone, aldosterone and corticosterone were bound with lower affinity to cytosol of MHS rats compared with that of MNS rats. This pattern of binding could explain the raised plasma corticosterone concentrations and adrenocortical hypertrophy previously noted in MHS. The coding sequence of MHS and MNS GR genes have been determined. The MHS gene differed in four respects from that of MNS: three silent point mutations and a polymorphic microsatellite region in exon 2. The latter polymorphism has been used in cosegregation studies of F2 hybrids of MHS x MNS. The MHS GR genotype was associated with hypercalciuria and lower blood pressure in female rats and lower body weight in male rats. Although the effect on blood pressure is small, it is consistent with the affinity data. MHS GR genotype cosegregated with lower blood pressure in F2 rats and displayed a lower affinity in binding studies. In conclusion, GR polymorphism may be responsible for differences of adrenocortical function between MHS and MNS. This may lead to a reduction in the blood pressure difference between the two strains.
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UR - http://www.scopus.com/inward/citedby.url?scp=0031857940&partnerID=8YFLogxK
U2 - 10.1677/jme.0.0210041
DO - 10.1677/jme.0.0210041
M3 - Article
C2 - 9723862
AN - SCOPUS:0031857940
VL - 21
SP - 41
EP - 50
JO - Journal of Molecular Endocrinology
JF - Journal of Molecular Endocrinology
SN - 0952-5041
IS - 1
ER -