scholarly journals Heterogeneity of Sensory-Induced Astrocytic Ca2+ Dynamics During Functional Hyperemia

2020 ◽  
Vol 11 ◽  
Author(s):  
Kushal Sharma ◽  
Grant R. J. Gordon ◽  
Cam Ha T. Tran

Astrocytic Ca2+ fluctuations associated with functional hyperemia have typically been measured from large cellular compartments such as the soma, the whole arbor and the endfoot. The most prominent Ca2+ event is a large magnitude, delayed signal that follows vasodilation. However, previous work has provided little information about the spatio-temporal properties of such Ca2+ transients or their heterogeneity. Here, using an awake, in vivo two-photon fluorescence-imaging model, we performed detailed profiling of delayed astrocytic Ca2+ signals across astrocytes or within individual astrocyte compartments using small regions of interest next to penetrating arterioles and capillaries along with vasomotor responses to vibrissae stimulation. We demonstrated that while a 5-s air puff that stimulates all whiskers predominantly generated reproducible functional hyperemia in the presence or absence of astrocytic Ca2+ changes, whisker stimulation inconsistently produced astrocytic Ca2+ responses. More importantly, these Ca2+ responses were heterogeneous among subcellular structures of the astrocyte and across different astrocytes that resided within the same field of view. Furthermore, we found that whisker stimulation induced discrete Ca2+ “hot spots” that spread regionally within the endfoot. These data reveal that astrocytic Ca2+ dynamics associated with the microvasculature are more complex than previously thought, and highlight the importance of considering the heterogeneity of astrocytic Ca2+ activity to fully understanding neurovascular coupling.

Small ◽  
2015 ◽  
Vol 12 (6) ◽  
pp. 782-792 ◽  
Author(s):  
Bin Chen ◽  
Guangxue Feng ◽  
Bairong He ◽  
Chiching Goh ◽  
Shidang Xu ◽  
...  

2015 ◽  
Vol 2015 ◽  
pp. 1-8 ◽  
Author(s):  
Friedrich Ihler ◽  
Mattis Bertlich ◽  
Bernhard Weiss ◽  
Steffen Dietzel ◽  
Martin Canis

Impairment of cochlear blood flow has been discussed as factor in the pathophysiology of various inner ear disorders. However, the microscopic study of cochlear microcirculation is limited due to small scale and anatomical constraints. Here, two-photon fluorescence microscopy is applied to visualize cochlear microvessels. Guinea pigs were injected with Fluorescein isothiocyanate- or Texas red-dextrane as plasma marker. Intravital microscopy was performed in four animals and explanted cochleae from four animals were studied. The vascular architecture of the cochlea was visualized up to a depth of90.0±22.7 μm. Imaging yielded a mean contrast-to-noise ratio (CNR) of3.3±1.7. Mean diameter in vivo was16.5±6.0 μm for arterioles and8.0±2.4 μm for capillaries. In explanted cochleae, the diameter of radiating arterioles and capillaries was measured with12.2±1.6 μm and6.6±1.0 μm, respectively. The difference between capillaries and arterioles was statistically significant in both experimental setups (P<0.001andP=0.022, two-way ANOVA). Measured vessel diameters in vivo and ex vivo were in agreement with published data. We conclude that two-photon fluorescence microscopy allows the investigation of cochlear microvessels and is potentially a valuable tool for inner ear research.


2015 ◽  
Vol 3 (5) ◽  
pp. 646-651 ◽  
Author(s):  
Pei-Pei Yang ◽  
Yang Yang ◽  
Yu-Juan Gao ◽  
Yi Wang ◽  
Ju-Chen Zhang ◽  
...  

The Analyst ◽  
2019 ◽  
Vol 144 (7) ◽  
pp. 2297-2303 ◽  
Author(s):  
Fangyun Xin ◽  
Yong Tian ◽  
Congcong Gao ◽  
Bingpeng Guo ◽  
Yulong Wu ◽  
...  

A two-photon fluorescence probe Mito-FA-FP can monitor mitochondrial morphology change and image endogenous FA in vivo.


2020 ◽  
Vol 26 (20) ◽  
pp. 4576-4582 ◽  
Author(s):  
Yandong Dou ◽  
Yajun Wang ◽  
Yukun Duan ◽  
Bin Liu ◽  
Qinglian Hu ◽  
...  

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