Local biosynthesis of corticosterone in rat skeletal muscle

Michiko Sato, Kimikazu Sugiyama, Naoyuki Maeda, Jumpei Fujiki, Takahiro Ieko, Yoshio Kawamura, Hidetomo Iwano, Kuniaki Mukai, Hiroshi Yokota

Research output: Contribution to journalArticle

Abstract

Adrenal corticosterone plays crucial roles in energy metabolism and immuno-reactivity throughout the body. As we have previously shown that corticosterone biosynthesis in C2C12 myoblasts, we study about corticosterone biosynthesis in rat skeletal muscles. It was found that enzymatic activities producing corticosterone and testosterone except the activity of P450scc in rat skeletal muscle as like as C2C12 cells. The CYP11B mRNA encoding cytochrome P45011β that mediates 11-deoxycorticosterone hydroxylase activity, producing corticosterone was expressed in skeletal muscles. In immunoblotting analysis, cytochrome P45011β protein was expressed in rat muscles and whole organs especially higher levels in adrenal and brain. The localizations of corticosterone content and enzymatic activities involved in the production of corticosterone were preferentially observed in gastrocnemius fibers rather than in soleus fibers. The immunohistochemical analysis showed that the fast-twitch or type II muscle fibers positive to antibody against fast myosin heavy chain were preferentially stained with anti-cytochrome P45011β antibody in the gastrocnemius fiber. In addition, we detected corticosterone biosynthesis from pregnenolone sulfate conjugates in perfusion of the rat hindquarter. Corticosterone is synthesized in rat skeletal muscles and the biosynthesis was localized in the fast-twitch or type II muscle fibers. We speculated that the local synthesized corticosterone might be involved in glucocorticoid-induced muscle atrophy that preferentially occurs in fast muscle fibers, and the initial substrate of the local CORT biosynthesis were supported to be performed from the conjugates such as pregnenolone sulfate circulating in the blood flow.

Original languageEnglish
Article number105693
JournalJournal of Steroid Biochemistry and Molecular Biology
Volume201
DOIs
Publication statusPublished - 2020 Jul

Keywords

  • Conjugate
  • Corticosterone
  • Degradation
  • Regeneration
  • Skeletal muscle
  • Sulfate-sulfatase pathway

ASJC Scopus subject areas

  • Endocrinology, Diabetes and Metabolism
  • Biochemistry
  • Molecular Medicine
  • Molecular Biology
  • Endocrinology
  • Clinical Biochemistry
  • Cell Biology

Fingerprint Dive into the research topics of 'Local biosynthesis of corticosterone in rat skeletal muscle'. Together they form a unique fingerprint.

  • Cite this

    Sato, M., Sugiyama, K., Maeda, N., Fujiki, J., Ieko, T., Kawamura, Y., Iwano, H., Mukai, K., & Yokota, H. (2020). Local biosynthesis of corticosterone in rat skeletal muscle. Journal of Steroid Biochemistry and Molecular Biology, 201, [105693]. https://doi.org/10.1016/j.jsbmb.2020.105693