Abstract
We have examined structures that may operate by using nitric oxide (NO)/soluble guanylyl cyclase (sGC) signalling in the lamina propria of the guinea pig bladder. Cells on the luminal surface of the urothelium and sub-urothelial interstitial cells (SU-ICs) responded to NO with a rise in cGMP. The distribution of these different cells varied between the base, lateral wall and dome. In the base, two regions were identified: areas with sparse surface urothelial cells and areas with a complete covering. A layer of cGMP-positive (cGMP+) cells (up to 10 cells deep) was found in the base. cGMP+/SU-ICs were also observed in the lateral wall. However, here, the cGMP+ cells were confined to a layer of only 1–2 cells immediately below the basal urothelial layer (basal cGMP+/SU-ICs). Below these cGMP+/SU-ICs lay cells that had a similar structure but that showed little cGMP accumulation (deep cGMP–/SU-ICs). Both basal and deep SU-ICs expressed the β1 subunit of sGC and the cGMP-dependent protein kinase I (cGKI), suggesting that the deep SU-ICs can sense NO and signal via cGMP. By using BAY 41-2272, a sensor of endogenous NO production, NO-dependent cGMP synthesis was observed primarily in the basal SU-ICs. A third population of cGKI+/cGMP− cells was seen to lie immediately below the basal urothelial layer. These cells (“necklace” cells) were less numerous than SU-ICs and extended linking processes suggesting a network. The specific functions of these structures are not known but they may contribute to the emerging multiple roles of the urothelium associated with the generation of bladder sensation.
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Abbreviations
- β1-sGC:
-
β1 subunit of soluble guanylyl cyclase
- BUCs:
-
Basal urothelial cells
- BV:
-
Blood vessel
- cGKI:
-
cGMP-dependent protein kinase I
- cGMP:
-
Cyclic guanosine mono-phosphate
- DEANO:
-
Diethylamine-NONOate
- IBMX:
-
Isobutyl-methyl-xanthine
- IM-ICs:
-
Intra-muscular interstitial cells
- IUCs:
-
Intermediate urothelial cells
- NO:
-
Nitric oxide
- nNOS:
-
Neuronal nitric oxide synthase
- MC-ICs:
-
Muscle-coat interstitial cells
- sGC:
-
Soluble guanylyl cyclase
- SM-ICs:
-
Surface muscle interstitial cells
- SUCs:
-
Surface urothelial cells
- SU-ICs:
-
Sub-urothelial interstitial cells
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Gillespie, J., Markerink-van Ittersum, M. & De Vente, J. Endogenous nitric oxide/cGMP signalling in the guinea pig bladder: evidence for distinct populations of sub-urothelial interstitial cells. Cell Tissue Res 325, 325–332 (2006). https://doi.org/10.1007/s00441-005-0146-4
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DOI: https://doi.org/10.1007/s00441-005-0146-4