Electron Microscopic Evidence on the Significance of the Granular and Vesicular Inclusions of the Neurosecretory Nerve Endings in the Median Eminence of the Rat

Pharmacology ◽  
1966 ◽  
Vol 15 (4) ◽  
pp. 357-369
Author(s):  
U.K. Rinne ◽  
A.U. Arstila
Keyword(s):  
Median Eminence ◽  
Nerve Endings ◽  
Electron Microscopic ◽  
Microscopic Evidence

scholarly journals Immunoelectron microscopic characterization of vasopressin neurons in macaques by use of formaldehyde-fixed tissues stored for several years

2021 ◽  
Author(s):  
Akito Otubo ◽  
Sho Maejima ◽  
Takumi Oti ◽  
Kaita Satoh ◽  
Yasumasa Ueda ◽  
...  
Keyword(s):  
Translational Research ◽  
Median Eminence ◽  
Glutamate Transporter ◽  
Microscopic Analysis ◽  
Nerve Endings ◽  
Size Difference ◽  
Posterior Pituitary ◽  
Electron Microscopic ◽  
Vasopressin Neurons

Translational research often requires the testing of experimental therapies in primates, but research in non-human primates is now stringently controlled by law around the world. Tissues fixed in formaldehyde without glutaraldehyde have been thought to be inappropriate for use in electron microscopic analysis, particularly those of the brain. Here we report the immunoelectron microscopic characterization of arginine vasopressin (AVP)-producing neurons in macaque hypothalamo-pituitary axis tissues fixed with 4% formaldehyde and stored at −25°C for several years. The size difference of dense-cored vesicles between magnocellular and parvocellular AVP neurons was detectable in their cell bodies and perivascular nerve endings located, respectively, in the posterior pituitary and median eminence. Furthermore, glutamate and the vesicular glutamate transporter 2 were colocalized with AVP in perivascular nerve endings of both the posterior pituitary and the external layer of the median eminence, suggesting that both magnocellular and parvocellular AVP neurons are glutamatergic in primates. Both ultrastructure and immunoreactivity can therefore be sufficiently preserved in macaque brain tissues stored long-term for light microscopy. Taken together, these results suggest that this methodology could be applied to the human post-mortem brain and be very useful in translational research.

scholarly journals Immunoelectron Microscopic Characterization of Vasopressin-Producing Neurons in the Hypothalamo-Pituitary Axis of Non-Human Primates by Use of Formaldehyde-Fixed Tissues Stored at –25 °C for Several Years

2021 ◽  
Vol 22 (17) ◽  
pp. 9180
Author(s):  
Akito Otubo ◽  
Sho Maejima ◽  
Takumi Oti ◽  
Keita Satoh ◽  
Yasumasa Ueda ◽  
...  
Keyword(s):  
Translational Research ◽  
Median Eminence ◽  
Glutamate Transporter ◽  
Microscopic Analysis ◽  
Nerve Endings ◽  
Size Difference ◽  
Posterior Pituitary ◽  
Electron Microscopic ◽  
Post Mortem Brain

Translational research often requires the testing of experimental therapies in primates, but research in non-human primates is now stringently controlled by law around the world. Tissues fixed in formaldehyde without glutaraldehyde have been thought to be inappropriate for use in electron microscopic analysis, particularly those of the brain. Here we report the immunoelectron microscopic characterization of arginine vasopressin (AVP)-producing neurons in macaque hypothalamo-pituitary axis tissues fixed by perfusion with 4% formaldehyde and stored at –25 °C for several years (4–6 years). The size difference of dense-cored vesicles between magnocellular and parvocellular AVP neurons was detectable in their cell bodies and perivascular nerve endings located, respectively, in the posterior pituitary and median eminence. Furthermore, glutamate and the vesicular glutamate transporter 2 could be colocalized with AVP in perivascular nerve endings of both the posterior pituitary and the external layer of the median eminence, suggesting that both magnocellular and parvocellular AVP neurons are glutamatergic in primates. Both ultrastructure and immunoreactivity can therefore be sufficiently preserved in macaque brain tissues stored long-term, initially for light microscopy. Taken together, these results suggest that this methodology could be applied to the human post-mortem brain and be very useful in translational research.

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