Effects of glycyrrhizic acid and steroid treatment on corticotropin releasing factor and beta-endorphin containing neurons of the hypothalamus of the rat.

Ruszymah Idrus, Nabishah Mohamad, S. Aminuddin, S. Sarjit, B. A. Khalid

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Abstract

Corticotrophin releasing factor (CRF) and beta-endorphin (beta EP) containing neurons are shown to be present in the hypothalamus and both neurons are found at the paraventricular nucleus (PVN). Steroid hormones have been found to alter the plasma level of these neurotransmitters. Glycyrrhizic acid (GCA) is the active component of liquorice. GCA inhibits the enzyme 11 beta-hydroxysteroid dehydrogenase (11HSD) which is needed for the inactivation of the steroid pathway, so therefore would cause changes to these neurons. The aim of this study was to investigate the effects of GCA as well as deoxycorticosterone (DOC) and dexamethasone (DM) on the modulation of CRF and beta EP containing neuron at the PVN of the hypothalamus. Rats were given either DM, DOC or GCA and adrenalectomized (ADX) and given either DM or DOC. At the end of treatment rats were transfused transcardially before sacrifice and the brain were dissected for immunohistochemical analysis. We found that immunostaining of the CRF containing neurons demonstrate a reduction in the number of positive neurons in DM treated rats. DOC and GCA treated rats showed the same result as in DM rats but the reduction is less. ADX, DM, DOC and GCA treated rats did not show any changes in the number of beta EP containing neurons but naloxone increased the number of beta EP containing neurons markedly. In conclusion, GCA and DOC have similar effects on CRF and beta EP containing neurons at the PVN.

Original languageEnglish
Pages (from-to)51-58
Number of pages8
JournalThe Malaysian journal of pathology
Volume21
Issue number1
Publication statusPublished - 1999

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Glycyrrhizic Acid
beta-Endorphin
Corticotropin-Releasing Hormone
Hypothalamus
Desoxycorticosterone
Steroids
Neurons
Dexamethasone
Paraventricular Hypothalamic Nucleus
11-beta-Hydroxysteroid Dehydrogenases
Glycyrrhiza
Naloxone
Neurotransmitter Agents
Hormones

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Effects of glycyrrhizic acid and steroid treatment on corticotropin releasing factor and beta-endorphin containing neurons of the hypothalamus of the rat. / Idrus, Ruszymah; Mohamad, Nabishah; Aminuddin, S.; Sarjit, S.; Khalid, B. A.

In: The Malaysian journal of pathology, Vol. 21, No. 1, 1999, p. 51-58.

Research output: Contribution to journalArticle

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AU - Sarjit, S.

AU - Khalid, B. A.

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N2 - Corticotrophin releasing factor (CRF) and beta-endorphin (beta EP) containing neurons are shown to be present in the hypothalamus and both neurons are found at the paraventricular nucleus (PVN). Steroid hormones have been found to alter the plasma level of these neurotransmitters. Glycyrrhizic acid (GCA) is the active component of liquorice. GCA inhibits the enzyme 11 beta-hydroxysteroid dehydrogenase (11HSD) which is needed for the inactivation of the steroid pathway, so therefore would cause changes to these neurons. The aim of this study was to investigate the effects of GCA as well as deoxycorticosterone (DOC) and dexamethasone (DM) on the modulation of CRF and beta EP containing neuron at the PVN of the hypothalamus. Rats were given either DM, DOC or GCA and adrenalectomized (ADX) and given either DM or DOC. At the end of treatment rats were transfused transcardially before sacrifice and the brain were dissected for immunohistochemical analysis. We found that immunostaining of the CRF containing neurons demonstrate a reduction in the number of positive neurons in DM treated rats. DOC and GCA treated rats showed the same result as in DM rats but the reduction is less. ADX, DM, DOC and GCA treated rats did not show any changes in the number of beta EP containing neurons but naloxone increased the number of beta EP containing neurons markedly. In conclusion, GCA and DOC have similar effects on CRF and beta EP containing neurons at the PVN.

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