World Library  
Flag as Inappropriate
Email this Article

Zona glomerulosa

Article Id: WHEBN0002648999
Reproduction Date:

Title: Zona glomerulosa  
Author: World Heritage Encyclopedia
Language: English
Subject: Adrenal gland, Aldosterone, Calcium channel blocker, Aldosterone synthase, Corticosteroid
Collection: Adrenal Gland
Publisher: World Heritage Encyclopedia
Publication
Date:
 

Zona glomerulosa

Zona glomerulosa
Layers of cortex.
Details
Latin Zona glomerulosa
Dorlands
/Elsevier
z_01/12869730
Anatomical terminology

The zona glomerulosa of the adrenal gland is the most superficial layer of the adrenal cortex, lying directly beneath the renal capsule. Its cells are ovoid and arranged in clusters or arches (glomus is Latin for "ball").

H & E staining of the adrenal cortex. The zona glomerulosa is the outermost layer, below the renal capsule (near the pointer)

In response to increased potassium levels, renin or decreased blood flow to the kidneys, cells of the zona glomerulosa produce and secrete the mineralocorticoid aldosterone into the blood as part of the renin-angiotensin system.[1] Although sustained production of aldosterone requires persistent calcium entry through low-voltage activated Ca2+ channels, isolated zona glomerulosa cells are considered nonexcitable, with recorded membrane voltages that are too hyperpolarized to permit Ca2+ channels entry.[2] However, mouse zona glomerulosa cells within adrenal slices spontaneously generate membrane potential oscillations of low periodicity; this innate electrical excitability of zona glomerulosa cells provides a platform for the production of a recurrent Ca2+ channels signal that can be controlled by angiotensin II and extracellular potassium, the 2 major regulators of aldosterone production.[2] Aldosterone regulates the body's concentration of electrolytes, primarily sodium and potassium, by acting on the distal convoluted tubule of kidney nephrons to: increase sodium reabsorption, increase potassium excretion, increase water reabsorption through osmosis.[1]

The enzyme aldosterone synthase (also known as CYP11B2) acts in this location[3][4] The expression of neuron-specific proteins in the zona glomerulosa cells of human adrenocortical tissues has been predicted and reported by several authors[5][6][7] and it was suggested that the expression of proteins like the neuronal cell adhesion molecule (NCAM) in the cells of the zona glomerulosa reflects the regenerative feature of these cells, which would lose NCAM immunoreactivity after moving to the zona fasciculata.[5][8] However, together with other data on neuroendocrine properties of zona glomerulosa cells, NCAM expression may reflect a neuroendocrine differentiation of these cells.[5] Voltage-dependent calcium channels have been detected in the zona glomerulosa of the human adrenal, which suggests that calcium-channel blockers may directly influence the adrenocortical biosynthesis of aldosterone in vivo. [9]

References

  1. ^ a b Marieb Human Anatomy & Physiology 9th edition, chapter:16, page:629, question number:14
  2. ^ a b Hu, Changlong; Rusin, Craig G.; Tan, Zhiyong; Guagliardo, Nick A.; Barrett, Paula Q. (2012). "Zona glomerulosa cells of the mouse adrenal cortex are intrinsic electrical oscillators". Journal of Clinical Investigation 122 (6): 2046–53.  
  3. ^ Curnow, K. M.; Tusie-Luna, M.-T.; Pascoe, L.; Natarajan, R.; Gu, J.-L.; Nadler, J. L.; White, P. C. (1991). "The Product of the CYP11B2 Gene is Required for Aldosterone Biosynthesis in the Human Adrenal Cortex". Molecular Endocrinology 5 (10): 1513–22.  
  4. ^ Zhou, M.Y.; Gomez-Sanchez, C.E. (1993). "Cloning and Expression of a Rat Cytochrome P-450 11β-Hydroxylase/Aldosterone Synthase (CYP11B2) cDNA Variant". Biochemical and Biophysical Research Communications 194 (1): 112–7.  
  5. ^ a b c Ehrhart-Bornstein, M.; Hilbers, U. (1998). "Neuroendocrine Properties of Adrenocortical Cells". Hormone and Metabolic Research 30: 436–439.  
  6. ^ Lefebvre, H.; Cartier, D; Duparc, C; Lihrmann, I; Contesse, V; Delarue, C; Godin, M; Fischmeister, R; Vaudry, H; Kuhn, JM (2002). "Characterization of Serotonin4 Receptors in Adrenocortical Aldosterone-Producing Adenomas: In Vivo and in Vitro Studies". Journal of Clinical Endocrinology & Metabolism 87 (3): 1211–6.  
  7. ^ Ye, P.; Mariniello, B.; Mantero, F.; Shibata, H.; Rainey, W. E (2007). "G-protein-coupled receptors in aldosterone-producing adenomas: A potential cause of hyperaldosteronism". Journal of Endocrinology 195 (1): 39–48.  
  8. ^ Haidan, A.; Bornstein, SR; Glasow, A; Uhlmann, K; Lübke, C; Ehrhart-Bornstein, M (1998). "Basal Steroidogenic Activity of Adrenocortical Cells is Increased 10-Fold by Coculture with Chromaffin Cells". Endocrinology 139 (2): 772–80.  
  9. ^ Saulo J.A. Felizola, Takashi Maekawa, Yasuhiro Nakamura, Fumitoshi Satoh, Yoshikiyo Ono, Kumi Kikuchi, Shizuka Aritomi, Keiichi Ikeda, Michihiro Yoshimura, Katsuyoshi Tojo, Hironobu Sasano. (2014). "Voltage-gated calcium channels in the human adrenal and primary aldosteronism.". J Steroid Biochem Mol Biol. 144 (part B): 410–416.  

External links

  • Histology image: 14502loa – Histology Learning System at Boston University
  • Anatomy Atlases - Microscopic Anatomy, plate 15.292 - "Adrenal Gland"
This article was sourced from Creative Commons Attribution-ShareAlike License; additional terms may apply. World Heritage Encyclopedia content is assembled from numerous content providers, Open Access Publishing, and in compliance with The Fair Access to Science and Technology Research Act (FASTR), Wikimedia Foundation, Inc., Public Library of Science, The Encyclopedia of Life, Open Book Publishers (OBP), PubMed, U.S. National Library of Medicine, National Center for Biotechnology Information, U.S. National Library of Medicine, National Institutes of Health (NIH), U.S. Department of Health & Human Services, and USA.gov, which sources content from all federal, state, local, tribal, and territorial government publication portals (.gov, .mil, .edu). Funding for USA.gov and content contributors is made possible from the U.S. Congress, E-Government Act of 2002.
 
Crowd sourced content that is contributed to World Heritage Encyclopedia is peer reviewed and edited by our editorial staff to ensure quality scholarly research articles.
 
By using this site, you agree to the Terms of Use and Privacy Policy. World Heritage Encyclopedia™ is a registered trademark of the World Public Library Association, a non-profit organization.
 


Copyright © World Library Foundation. All rights reserved. eBooks from Project Gutenberg are sponsored by the World Library Foundation,
a 501c(4) Member's Support Non-Profit Organization, and is NOT affiliated with any governmental agency or department.