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At least 109 records · Page 6Linked to original sources
PubMed1989

Beta 1- and beta 2-adrenergic 125I-pindolol binding sites in the interpeduncular nucleus of the rat: normal distribution and the effects of deafferentation.

The plasticity of the beta 1- and beta 2-adrenergic receptor subtypes was examined in the interpeduncular nucleus (IPN) of the adult rat. The beta-adrenergic receptor antagonist 125I-pindolol (125I-PIN) was used in conjunction with the selective subtype antagonists ICI 118,551 and ICI 89,406 to determine the subnuclear distribution of beta 1- and beta 2-adrenergic receptors in this nucleus and to correlate the receptor distribution with the distribution of both noradrenergic afferents from the locus coeruleus (LC) and non-noradrenergic afferents from the fasiculus retroflexus (FR). The density of these binding sites was examined following lesions that decreased (LC lesions) or increased (FR lesions) the density of the noradrenergic projection in the IPN. Quantitative radioautography indicated that beta 1-labeled binding sites account for the larger percentage of binding sites in the IPN. The beta 1-binding sites are densest in the those subnuclei that receive a noradrenergic projection from the LC: the central, rostral, and intermediate subnuclei. beta 1-binding sites are algo homogeneously distributed throughout the lateral subnuclei, where there is no detectable noradrenergic innervation. beta 2-binding sites have a more restricted distribution. They are concentrated in the ventral half of the lateral subnuclei, where they account for 70% of total 125I-PIN binding sites. beta 2-binding sites are also present along the ventral border of the IPN. Some of this labeling extends into the central and intermediate subnuclei. Bilateral lesions of the LC, which selectively remove noradrenergic innervation to the IPN, result in an increase in the beta 1-binding sites. Bilateral lesions of the FR, which remove the major cholinergic and peptidergic input from the IPN, elicit an increase in noradrenergic projections and a decrease in beta 1-binding sites. beta 1-binding sites thus exhibit both up-regulation and down-regulation which is correlated with the density of the noradrenergic projection. Our results suggest, therefore, that the density of beta 1-binding sites is regulated by noradrenergic input. beta 2-binding sites increase in density in response to both the LC and FR lesions, suggesting that they are postsynaptic to both of these afferents. The distribution suggests that some of these binding sites may reflect binding to glial cells. The beta 2-binding sites may therefore be regulated by both noradrenergic and non-noradrenergic mechanisms.

Adrenergic beta-Antagonists↗
PubMed1989

Immunoglobulin allotypes are normally distributed in Swedish AIDS patients.

Immunoglobulin allotypes G1m(a), G1m(x), G3m(b) and Km(1) were determined in 83 Swedish AIDS patients. Twenty of the patients had Kaposi's sarcoma and 29 had Pneumocystis carinii pneumonia. The distribution of the Gm and Km allotypes did not significantly differ between these different disease categories and the general Swedish population.

Acquired Immunodeficiency Syndrome↗