Effect of exogenous glutamate and N-Methyl-D-aspartic acid on spontaneous activity of isolated human ureter
(2007) In International Journal of Urology 14(9). p.7-833- Abstract
OBJECTIVES: While the neurotransmitter role of glutamate in the gastrointestinal tract has been shown, its effects on smooth muscle of the human ureter have not previously been investigated. In our study we have investigated the effects of exogenous glutamate on the spontaneous activity of isolated human ureter, taken from 14 adult patients after nephrectomy.
METHODS: The segment of ureter, excised 3 cm distal from the pyeloureteral junction, was isolated in an organ bath. Both longitudinal tension and intraluminal pressure of the segment were recorded simultaneously.
RESULTS: Glutamate administered in the lumen of the isolated ureteral segments (7.8 x 10(-7) M/L-3.5 x 10(-2) M/L) was ineffective. When added to the isolated... (More)
OBJECTIVES: While the neurotransmitter role of glutamate in the gastrointestinal tract has been shown, its effects on smooth muscle of the human ureter have not previously been investigated. In our study we have investigated the effects of exogenous glutamate on the spontaneous activity of isolated human ureter, taken from 14 adult patients after nephrectomy.
METHODS: The segment of ureter, excised 3 cm distal from the pyeloureteral junction, was isolated in an organ bath. Both longitudinal tension and intraluminal pressure of the segment were recorded simultaneously.
RESULTS: Glutamate administered in the lumen of the isolated ureteral segments (7.8 x 10(-7) M/L-3.5 x 10(-2) M/L) was ineffective. When added to the isolated organ bath from the serous side of the ureteral segment, glutamate (7.9 x 10(-6) M/L-10.6 x 10(-3) M/L) and N-Methyl-D-aspartic acid (NMDA) (9.1 x 10(-8) M/L-3.1 x 10(-5) M/L) produced a concentration-dependent increase in spontaneous activity of the isolated preparations, while kainic acid (6.3 x 10(-8) M/L-10.5 x 10(-5) M/L) and (+/-)-trans-1-Aminocyclopentane-trans-1,3-dicarboxylic acid (ACPD) (7.7 x 10(-8) M/L -6.5 x 10(-5) M/L) were ineffective.
CONCLUSIONS: The results of our study suggest that an excitatory neurotransmitter glutamate stimulates spontaneous activity of the human ureter through activation of NMDA ionotropic receptors, located on smooth muscle cells or intramural nerve fibers.
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- author
- Jankovic, Slobodan M ; Jankovic, Snezana V ; Stojadinovic, Dobrivoje ; Jakovljevic, Mihajlo LU and Milovanovic, Dragan
- publishing date
- 2007-09
- type
- Contribution to journal
- publication status
- published
- keywords
- Adult, Aged, Cycloleucine/analogs & derivatives, Female, Glutamic Acid/physiology, Humans, In Vitro Techniques, Kainic Acid, Male, Middle Aged, Muscle, Smooth/physiology, N-Methylaspartate/physiology, Ureter/physiology
- in
- International Journal of Urology
- volume
- 14
- issue
- 9
- pages
- 7 - 833
- publisher
- Wiley-Blackwell
- external identifiers
-
- pmid:17760751
- scopus:34548156683
- ISSN
- 0919-8172
- DOI
- 10.1111/j.1442-2042.2007.01834.x
- language
- English
- LU publication?
- no
- id
- 6bd11d9a-4abc-4c01-8e40-1aefa3481b70
- date added to LUP
- 2018-09-01 23:12:17
- date last changed
- 2024-01-15 00:42:37
@article{6bd11d9a-4abc-4c01-8e40-1aefa3481b70,
abstract = {{<p>OBJECTIVES: While the neurotransmitter role of glutamate in the gastrointestinal tract has been shown, its effects on smooth muscle of the human ureter have not previously been investigated. In our study we have investigated the effects of exogenous glutamate on the spontaneous activity of isolated human ureter, taken from 14 adult patients after nephrectomy.</p><p>METHODS: The segment of ureter, excised 3 cm distal from the pyeloureteral junction, was isolated in an organ bath. Both longitudinal tension and intraluminal pressure of the segment were recorded simultaneously.</p><p>RESULTS: Glutamate administered in the lumen of the isolated ureteral segments (7.8 x 10(-7) M/L-3.5 x 10(-2) M/L) was ineffective. When added to the isolated organ bath from the serous side of the ureteral segment, glutamate (7.9 x 10(-6) M/L-10.6 x 10(-3) M/L) and N-Methyl-D-aspartic acid (NMDA) (9.1 x 10(-8) M/L-3.1 x 10(-5) M/L) produced a concentration-dependent increase in spontaneous activity of the isolated preparations, while kainic acid (6.3 x 10(-8) M/L-10.5 x 10(-5) M/L) and (+/-)-trans-1-Aminocyclopentane-trans-1,3-dicarboxylic acid (ACPD) (7.7 x 10(-8) M/L -6.5 x 10(-5) M/L) were ineffective.</p><p>CONCLUSIONS: The results of our study suggest that an excitatory neurotransmitter glutamate stimulates spontaneous activity of the human ureter through activation of NMDA ionotropic receptors, located on smooth muscle cells or intramural nerve fibers.</p>}},
author = {{Jankovic, Slobodan M and Jankovic, Snezana V and Stojadinovic, Dobrivoje and Jakovljevic, Mihajlo and Milovanovic, Dragan}},
issn = {{0919-8172}},
keywords = {{Adult; Aged; Cycloleucine/analogs & derivatives; Female; Glutamic Acid/physiology; Humans; In Vitro Techniques; Kainic Acid; Male; Middle Aged; Muscle, Smooth/physiology; N-Methylaspartate/physiology; Ureter/physiology}},
language = {{eng}},
number = {{9}},
pages = {{7--833}},
publisher = {{Wiley-Blackwell}},
series = {{International Journal of Urology}},
title = {{Effect of exogenous glutamate and N-Methyl-D-aspartic acid on spontaneous activity of isolated human ureter}},
url = {{http://dx.doi.org/10.1111/j.1442-2042.2007.01834.x}},
doi = {{10.1111/j.1442-2042.2007.01834.x}},
volume = {{14}},
year = {{2007}},
}