Premium
Laminar expression of m 1‐, m 3‐ and m 4‐muscarinic cholinergic receptor genes in the developing rat visual cortex using in situ hybridization histochemistry. Effect of monocular visual deprivation
Author(s) -
Roβner Steffen,
Kues Wilfried,
Witzemann Veit,
Schliebs Reinhard
Publication year - 1993
Publication title -
international journal of developmental neuroscience
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.761
H-Index - 88
eISSN - 1873-474X
pISSN - 0736-5748
DOI - 10.1016/0736-5748(93)90008-2
Subject(s) - muscarinic acetylcholine receptor , in situ hybridization , laminar flow , cholinergic , muscarinic acetylcholine receptor m2 , muscarinic acetylcholine receptor m1 , neuroscience , biology , microbiology and biotechnology , gene , receptor , chemistry , gene expression , physics , genetics , thermodynamics
The postnatal development of laminar pattern of m 1‐, m 3‐ and m 4‐mRNA‐muscarinic acetylcholine receptor subtypes in the visual cortex of both normally raised and monocularly deprived rats (one eyelid sutured at the age of 11 days) was studied using in situ hybridization histochemistry and computer‐assisted image analysis. From birth until day 15 the level of m 1‐receptor transcript in layer II/III increases markedly as compared to deeper layers. From day 15 up to day 18 a transient bimodal pattern develops with peaks in layers II/III and VI. Already on day 35 a more homogeneous distribution of m 1‐receptor mRNA level is detectable persisting until adulthood. In contrast, the m 3‐receptor mRNA shows already at birth a bimodal distribution with peaks in layers II/III and VI. Further development until adulthood results in transient changes in the ratio of the mRNA levels in these layers. In the adult visual cortex a similar laminar pattern as at birth is observed. From day 1 up to day 10 a relative increase in the mRNA level of the m 4‐receptor in layers II to IV is observed. From day 10 until day 15 a bimodal distribution of receptor mRNA develops with peaks in layers III and VI which is similar to the adult stage. However, between days 18 and 35 a shift in the laminar receptor mRNA distribution occurs resulting in peaks in layers IV and VI. The labeling of the m 5‐receptor transcript in rat visual cortex was very weak and did not show any alteration with age. Unilateral eyelid closure from postnatal day 11 resulted in transient changes in the laminar distribution of m 3‐ and m 4‐receptor mRNA between postnatal days 18 and 25, whereas the development of the laminar pattern of the m 1‐receptor mRNA was not affected regardless of the length of visual deprivation. The distinct laminar developmental pattern of mRNA muscarinic receptor subtypes in rat visual cortex suggests specific roles of the muscarinic receptor subtypes during the first weeks of postnatal maturation of visual function.