decrease of the responsiveness of beta-2 adrenoceptors of diabetic rat knee joint blood vessels in acute inflammation

Authors

sohrab hajizadeh dept. of physiology,tarbiat modares university, pobox:14115-111 tehran - iran

batool erfani dept. of physiology,tarbiat modares university, pobox:14115-111 tehran - iran

s. mohammad faghihi dept. of physiology,tarbiat modares university, pobox:14115-111 tehran - iran

zahra barabadi dept. of physiology,tarbiat modares university, pobox:14115-111 tehran - iran

abstract

beta-2 adrenoceptors in blood vessels are one of the active factors that play a role in regulation of tissue blood flow. in diabetic angiopathy, responsiveness of these receptors is decreased, while that is increased in inflammation. according to these opposite effects, the aim of this study was to investigate the vasodilatory response of knee joint blood vessels to salbutamol (beta-2 adrenoceptor agonist) in iddm with combination of acute inflammation. acute knee joint inflammation was induced by intraarticular injection of kaolin 4% and induction of diabetes was performed by streptozotocine (55 mg/kg). wistar rats weighting 200-300 gr were used. the animals divided in 5 groups as: the control, saline, diabetic, inflammatory and diabetic- inflammatory. blood flow of knee joint was measured using laser doppler flowmeter technique (ldf). vasodilatation of articular micro vascular was measured in response to topical application of different concentration (10 -11 -10 -1) of salbutamol. results obtained in this study showed that: 1- increased knee joint diameter and perimeter due to acute inflammation in diabetic rat knee joint were significantly lesser than that of inflammatory rats. 2- responsiveness of beta-2 adrenoceptors were increased in kaolin- induced acute inflammation. 3- in diabetic rats, kaolin- induced acute inflammation could not increase the responsiveness of beta-2 adrenoceptors. based on above mentioned results, we conclude that diabetes inhibits the increasing effects of acute inflammation on responsiveness of beta-2 adrenoceptors.

Upgrade to premium to download articles

Sign up to access the full text

Already have an account?login

similar resources

Decrease of the responsiveness of beta-2 adrenoceptors of diabetic rat knee joint blood vessels in acute inflammation

Beta-2 adrenoceptors in blood vessels are one of the active factors that play a role in regulation of tissue blood flow. in diabetic angiopathy, responsiveness of these receptors is decreased, while that is increased in inflammation. According to these opposite effects, the aim of this study was to investigate the vasodilatory response of knee joint blood vessels to salbutamol (Beta-2 adreno...

full text

Alterations in the vascular β-adrenoceptors of the rabbit knee joint due to acute inflammation

  It has been shown that acute inflammation reduces the effectiveness of sympathetic nerves in the regulation of knee joint blood flow. To investigate the role of vascular β- adrenoceptors in this event, 12 NZW rabbits were maintained anaesthetized by 1 % halothane in N2O/O2, and acute knee joint inflammation was induced by intra-articular injection of 1 ml of 2% carageenan solution 24 hours be...

full text

The Effect of Chronic Inflammation on Knee Joint Vascular β-adrenoceptors in Rabbit

It has been shown that inflammation reduces the effectiveness of sympathetic nerves in the regulation of knee joint blood flow, and the joint vascular- ß adrenoceptors are changed due to acute inflammation from a majority of ß-1 to an equality of ß-1 and ß-2 receptors.. To investigate the role of sympathetic nerves in nerve induced vasoconstriction and changes in joint vascular ß-adrenoceptors ...

full text

Decrease in blood flow and temperature of rat knee joint by calcium

Introduction: The Blood flow increases in the inflamed joint induced by Complete Freund’s Adjuvant (CFA). Since the anti-inflammatory effect of calcium channel blockers have been shown in pervious studies, the present study investigates the role of these blockers on the blood flow and temperature (inflammation indices) in inflamed knee joint induced by CFA. Methods: This experimental study wa...

full text

study of cohesive devices in the textbook of english for the students of apsychology by rastegarpour

this study investigates the cohesive devices used in the textbook of english for the students of psychology. the research questions and hypotheses in the present study are based on what frequency and distribution of grammatical and lexical cohesive devices are. then, to answer the questions all grammatical and lexical cohesive devices in reading comprehension passages from 6 units of 21units th...

My Resources

Save resource for easier access later


Journal title:
physiology and pharmacology

جلد ۱۲، شماره ۳، صفحات ۲۲۱-۲۲۶

Keywords
[ ' b e t a ' , ' 2 a d r e n o c e p t o r s i n b l o o d v e s s e l s a r e o n e o f t h e a c t i v e f a c t o r s t h a t p l a y a r o l e i n r n r e g u l a t i o n o f t i s s u e b l o o d f l o w . i n d i a b e t i c a n g i o p a t h y ' , ' r e s p o n s i v e n e s s o f t h e s e r e c e p t o r s i s d e c r e a s e d ' , ' w h i l e t h a t i s i n c r e a s e d i n i n f l a m m a t i o n . a c c o r d i n g t o t h e s e o p p o s i t e e f f e c t s ' , ' t h e a i m o f t h i s s t u d y w a s t o i n v e s t i g a t e t h e v a s o d i l a t o r y r e s p o n s e o f k n e e j o i n t b l o o d v e s s e l s t o s a l b u t a m o l ( b e t a ' , ' 2 a d r e n o c e p t o r a g o n i s t ) i n i d d m w i t h c o m b i n a t i o n o f a c u t e i n f l a m m a t i o n . r n a c u t e k n e e j o i n t i n f l a m m a t i o n w a s i n d u c e d b y i n t r a a r t i c u l a r i n j e c t i o n o f k a o l i n 4 % a n d i n d u c t i o n o f d i a b e t e s w a s p e r f o r m e d b y s t r e p t o z o t o c i n e ( 5 5 m g / k g ) . w i s t a r r a t s w e i g h t i n g 2 0 0 ' , ' 3 0 0 g r w e r e u s e d . t h e a n i m a l s d i v i d e d i n 5 g r o u p s a s : t h e c o n t r o l ' , ' s a l i n e ' , ' d i a b e t i c ' , ' i n f l a m m a t o r y a n d d i a b e t i c ' , ' i n f l a m m a t o r y . b l o o d f l o w o f k n e e j o i n t w a s m e a s u r e d u s i n g l a s e r d o p p l e r f l o w m e t e r t e c h n i q u e ( l d f ) . v a s o d i l a t a t i o n o f a r t i c u l a r m i c r o v a s c u l a r w a s m e a s u r e d i n r e s p o n s e t o t o p i c a l a p p l i c a t i o n o f d i f f e r e n t c o n c e n t r a t i o n ( 1 0 ' , 1 1 , 1 0 , ' 1 ) o f s a l b u t a m o l . r n r e s u l t s o b t a i n e d i n t h i s s t u d y s h o w e d t h a t : r n 1 ' , ' i n c r e a s e d k n e e j o i n t d i a m e t e r a n d p e r i m e t e r d u e t o a c u t e i n f l a m m a t i o n i n d i a b e t i c r a t k n e e j o i n t w e r e s i g n i f i c a n t l y l e s s e r t h a n t h a t o f i n f l a m m a t o r y r a t s . r n 2 ' , ' r e s p o n s i v e n e s s o f b e t a ' , ' 2 a d r e n o c e p t o r s w e r e i n c r e a s e d i n k a o l i n ' , ' i n d u c e d a c u t e i n f l a m m a t i o n . r n 3 ' , ' i n d i a b e t i c r a t s ' , ' k a o l i n ' , ' i n d u c e d a c u t e i n f l a m m a t i o n c o u l d n o t i n c r e a s e t h e r e s p o n s i v e n e s s o f b e t a ' , ' 2 a d r e n o c e p t o r s . r n b a s e d o n a b o v e m e n t i o n e d r e s u l t s ' , ' w e c o n c l u d e t h a t d i a b e t e s i n h i b i t s t h e i n c r e a s i n g e f f e c t s o f a c u t e i n f l a m m a t i o n o n r e s p o n s i v e n e s s o f b e t a ' , ' 2 a d r e n o c e p t o r s . ' ]

Hosted on Doprax cloud platform doprax.com

copyright © 2015-2023