Immunocytochemical detection of insulin in rat hypothalamus and its possible uptake from cerebrospinal fluid

D. G. Baskin, S. C. Woods, D. B. West, M. van Houten, B. I. Posner, Daniel Dorsa, D. Porte

Research output: Contribution to journalArticle

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Abstract

Insulin-like immunoreactivity (IRI) was detected in the rat hypothalamus, particularly in the paraventricular, periventricular, supraoptic, suprachiasmatic, arcuate, and lateral hypothalamic nuclei. The immunostainable IRI was diffusely distributed in comparison to the neuronal concentrations of immunostainable vasopressin in the periventricular nucleus, or of IRI in islet B cells, suggesting that immunostainable IRI in the hypothalamus is not concentrated in neuronal perikarya. To determine if insulin in cerebrospinal fluid (CSF) may be a source of some insulin in brain tissue, [125I]iodoinsulin was stereotaxically injected into a lateral cerebral ventricle, and the uptake of radioactivity into periventricular hypothalamus was localized by quantitative autoradiography of paraffin-embedded brain sections and by measuring the radioactivity present in microdissected brain regions. In brains that received lateral ventricular injections of labeled insulin, the concentration of radioactivity in the periventricular region of the hypothalamus, as revealed by autoradiographic grains, was significantly greater than that in the periventricular region of brains that received lateral ventricular injections of labeled insulin mixed with an equimolar excess of an unlabeled peptide (insulin, ribonuclease, or both together). The highest levels of radioactivity detected in both autoradiographic and microdissection procedures were in regions nearest to the third ventricle, suggesting that insulin in the lateral ventricles has access to the periventricular neuropile in the hypothalamus. The staining pattern of immunostainable insulin in the hypothalamus along with the distribution of radioactivity after CSF injection of labeled insulin are consistent with the hypothesis that insulin is taken up into brain from the CSF.

Original languageEnglish (US)
Pages (from-to)1818-1825
Number of pages8
JournalEndocrinology
Volume113
Issue number5
StatePublished - 1983
Externally publishedYes

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Hypothalamus
Cerebrospinal Fluid
Insulin
Radioactivity
Brain
Lateral Ventricles
Injections
Biphasic Insulins
Lateral Hypothalamic Area
Cerebral Ventricles
Microdissection
Third Ventricle
Neuropil
Ribonucleases
Autoradiography
Vasopressins
Islets of Langerhans
Paraffin
B-Lymphocytes
Staining and Labeling

ASJC Scopus subject areas

  • Endocrinology
  • Endocrinology, Diabetes and Metabolism

Cite this

Baskin, D. G., Woods, S. C., West, D. B., van Houten, M., Posner, B. I., Dorsa, D., & Porte, D. (1983). Immunocytochemical detection of insulin in rat hypothalamus and its possible uptake from cerebrospinal fluid. Endocrinology, 113(5), 1818-1825.

Immunocytochemical detection of insulin in rat hypothalamus and its possible uptake from cerebrospinal fluid. / Baskin, D. G.; Woods, S. C.; West, D. B.; van Houten, M.; Posner, B. I.; Dorsa, Daniel; Porte, D.

In: Endocrinology, Vol. 113, No. 5, 1983, p. 1818-1825.

Research output: Contribution to journalArticle

Baskin, DG, Woods, SC, West, DB, van Houten, M, Posner, BI, Dorsa, D & Porte, D 1983, 'Immunocytochemical detection of insulin in rat hypothalamus and its possible uptake from cerebrospinal fluid', Endocrinology, vol. 113, no. 5, pp. 1818-1825.
Baskin DG, Woods SC, West DB, van Houten M, Posner BI, Dorsa D et al. Immunocytochemical detection of insulin in rat hypothalamus and its possible uptake from cerebrospinal fluid. Endocrinology. 1983;113(5):1818-1825.
Baskin, D. G. ; Woods, S. C. ; West, D. B. ; van Houten, M. ; Posner, B. I. ; Dorsa, Daniel ; Porte, D. / Immunocytochemical detection of insulin in rat hypothalamus and its possible uptake from cerebrospinal fluid. In: Endocrinology. 1983 ; Vol. 113, No. 5. pp. 1818-1825.
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