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Nitric oxide mediates microvascular permeability in the isolated perfused rat mesentery?
K Addicks1, S Arnhold, P Fasching
1Department of Anatomy, University of Cologne, Germany.
Abstract:
The permeability influencing effect of nitric oxide was studied by means of an isolated perfused mesentery preparation in combination with a intravital/fluorescence microscopic set up. As a fluorescent marker served FITC-dextran mol wt 70,000 daltons. Tissue treatment was performed by application of NO-donors like SNP or GTN. Additionally the effects of bradykinin, L-nitroarginine or the combination of both were tested in regard to a permeability modulation. The results point out that NO-donors did not enhance microvascular permeability, whereas the permeability increasing effect of bradykinin is mediated by an NO-independent pathway.
Insights
Nitric oxide (NO) donors did not increase microvascular permeability in perfused mesentery. Bradykinin
Area of Science:
- Physiology
- Pharmacology
- Microcirculation Research
Background:
- Nitric oxide (NO) plays a crucial role in regulating vascular tone and permeability.
- Understanding NO's precise role in microvascular permeability is essential for various physiological and pathological conditions.
Purpose of the Study:
- To investigate the direct effect of nitric oxide donors on microvascular permeability.
- To determine whether the permeability-increasing effects of bradykinin involve nitric oxide.
Main Methods:
- Utilized an isolated perfused rat mesentery preparation.
- Employed intravital/fluorescence microscopy with FITC-dextran (70,000 daltons) as a fluorescent marker.
- Administered nitric oxide donors (SNP, GTN), bradykinin, L-nitroarginine, and combinations thereof.
Main Results:
- Nitric oxide donors (SNP, GTN) did not enhance microvascular permeability.
- Bradykinin significantly increased microvascular permeability.
- The permeability-increasing effect of bradykinin was found to be independent of nitric oxide.
Conclusions:
- Nitric oxide does not appear to directly increase microvascular permeability in this model.
- Bradykinin-mediated microvascular permeability is regulated via an NO-independent pathway.