Comparative In Vitro Effects of Calcineurin Inhibitors on Functional Vascular Relaxations of Both Rat Thoracic and Abdominal Aorta
Background and Aim. Calcineurin inhibitors (CNIs) have shown to develop hypertension in transplant patients. The in vitro incubation effects of cyclosporine (CsA) and tacrolimus (Tac) on vascular relaxations of rat thoracic aorta (TA) and abdominal aorta (AA) need to be investigated. Methods. The o...
Saved in:
| Main Authors: | , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Wiley
2013-01-01
|
| Series: | Advances in Pharmacological Sciences |
| Online Access: | http://dx.doi.org/10.1155/2013/718313 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1832548965194661888 |
|---|---|
| author | Ashok Jadhav Venkat Gopalakrishnan Ahmed Shoker |
| author_facet | Ashok Jadhav Venkat Gopalakrishnan Ahmed Shoker |
| author_sort | Ashok Jadhav |
| collection | DOAJ |
| description | Background and Aim. Calcineurin inhibitors (CNIs) have shown to develop hypertension in transplant patients. The in vitro incubation effects of cyclosporine (CsA) and tacrolimus (Tac) on vascular relaxations of rat thoracic aorta (TA) and abdominal aorta (AA) need to be investigated.
Methods. The optimal concentrations of CsA (1.0 mg/mL) and Tac (0.1 mg/mL) used to compare endothelium-dependent (acetylcholine (ACh)) and endothelium-independent (sodium nitroprusside (SNP)) vascular relaxation against the agonists in phenylephrine (PE-) constricted TA and AA of 13-week-old male Sprague Dawley rats (n=6).
Results. In TA, the maximal vasodilator response elicited by ACh (control: Imax 98%) was significantly (P<0.01) inhibited by CsA (Imax 10%) but not by Tac (Imax 97%). In AA, (control: IC50 50 nM; Imax 100%) CsA (IC50 7 μM; (P<0.01) showed strong sensitivity to inhibit ACh-dependent vascular relaxation than Tac (IC50 215 nM (P<0.05); Imax 98%). CsA and Tac failed to affect the inhibitory responses to SNP in both TA and AA.
Conclusion. CsA exerts profound inhibitory effect on endothelium-dependent vasodilatation as compared to Tac in both TA and AA. Aortic rings from the thoracic region are more sensitive to CNIs, since the vasodilator response to ACh is solely mediated by NO while in the AA, ACh likely recruits other endothelial mediators besides NO to maintain vasodilatation. |
| format | Article |
| id | doaj-art-9f0d5cd2d35c4ce482ac0d805a851a14 |
| institution | Kabale University |
| issn | 1687-6334 1687-6342 |
| language | English |
| publishDate | 2013-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Advances in Pharmacological Sciences |
| spelling | doaj-art-9f0d5cd2d35c4ce482ac0d805a851a142025-02-03T06:12:29ZengWileyAdvances in Pharmacological Sciences1687-63341687-63422013-01-01201310.1155/2013/718313718313Comparative In Vitro Effects of Calcineurin Inhibitors on Functional Vascular Relaxations of Both Rat Thoracic and Abdominal AortaAshok Jadhav0Venkat Gopalakrishnan1Ahmed Shoker2Department of Pharmacology, College of Medicine, University of Saskatchewan, Saskatoon, SK, S7N 5E5, CanadaDepartment of Pharmacology, College of Medicine, University of Saskatchewan, Saskatoon, SK, S7N 5E5, CanadaDepartment of Medicine, College of Medicine, University of Saskatchewan, Saskatoon, SK, S7J 5B6, CanadaBackground and Aim. Calcineurin inhibitors (CNIs) have shown to develop hypertension in transplant patients. The in vitro incubation effects of cyclosporine (CsA) and tacrolimus (Tac) on vascular relaxations of rat thoracic aorta (TA) and abdominal aorta (AA) need to be investigated. Methods. The optimal concentrations of CsA (1.0 mg/mL) and Tac (0.1 mg/mL) used to compare endothelium-dependent (acetylcholine (ACh)) and endothelium-independent (sodium nitroprusside (SNP)) vascular relaxation against the agonists in phenylephrine (PE-) constricted TA and AA of 13-week-old male Sprague Dawley rats (n=6). Results. In TA, the maximal vasodilator response elicited by ACh (control: Imax 98%) was significantly (P<0.01) inhibited by CsA (Imax 10%) but not by Tac (Imax 97%). In AA, (control: IC50 50 nM; Imax 100%) CsA (IC50 7 μM; (P<0.01) showed strong sensitivity to inhibit ACh-dependent vascular relaxation than Tac (IC50 215 nM (P<0.05); Imax 98%). CsA and Tac failed to affect the inhibitory responses to SNP in both TA and AA. Conclusion. CsA exerts profound inhibitory effect on endothelium-dependent vasodilatation as compared to Tac in both TA and AA. Aortic rings from the thoracic region are more sensitive to CNIs, since the vasodilator response to ACh is solely mediated by NO while in the AA, ACh likely recruits other endothelial mediators besides NO to maintain vasodilatation.http://dx.doi.org/10.1155/2013/718313 |
| spellingShingle | Ashok Jadhav Venkat Gopalakrishnan Ahmed Shoker Comparative In Vitro Effects of Calcineurin Inhibitors on Functional Vascular Relaxations of Both Rat Thoracic and Abdominal Aorta Advances in Pharmacological Sciences |
| title | Comparative In Vitro Effects of Calcineurin Inhibitors on Functional Vascular Relaxations of Both Rat Thoracic and Abdominal Aorta |
| title_full | Comparative In Vitro Effects of Calcineurin Inhibitors on Functional Vascular Relaxations of Both Rat Thoracic and Abdominal Aorta |
| title_fullStr | Comparative In Vitro Effects of Calcineurin Inhibitors on Functional Vascular Relaxations of Both Rat Thoracic and Abdominal Aorta |
| title_full_unstemmed | Comparative In Vitro Effects of Calcineurin Inhibitors on Functional Vascular Relaxations of Both Rat Thoracic and Abdominal Aorta |
| title_short | Comparative In Vitro Effects of Calcineurin Inhibitors on Functional Vascular Relaxations of Both Rat Thoracic and Abdominal Aorta |
| title_sort | comparative in vitro effects of calcineurin inhibitors on functional vascular relaxations of both rat thoracic and abdominal aorta |
| url | http://dx.doi.org/10.1155/2013/718313 |
| work_keys_str_mv | AT ashokjadhav comparativeinvitroeffectsofcalcineurininhibitorsonfunctionalvascularrelaxationsofbothratthoracicandabdominalaorta AT venkatgopalakrishnan comparativeinvitroeffectsofcalcineurininhibitorsonfunctionalvascularrelaxationsofbothratthoracicandabdominalaorta AT ahmedshoker comparativeinvitroeffectsofcalcineurininhibitorsonfunctionalvascularrelaxationsofbothratthoracicandabdominalaorta |