Alpha-tocopherol succinate increases cyclooxygenase-2 activity: Tissue-specific action in pregnant rat uterus in vitro

Anna Kothencz, Judit Hajagos-Tóth, Adrienn Csányi, R. Gáspár

Research output: Contribution to journalArticle

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Abstract

Aims Lipid soluble vitamin E plays a role in several physiological mechanisms, however, the mechanism of this action is controversial. We investigated how tocopherol (α-tocopherol acid succinate) influences the effects of cyclooxygenase inhibitors (COXi) in the smooth muscles. Main methods The contractility of the samples from 22-day-pregnant myometrium and non-pregnant myometrium and trachea was determined in an isolated organ bath in vitro. The activity of cyclooxygenase enzymes (COX) was also measured in the tissues. Key findings Diclofenac (10− 9–10− 5 M) and rofecoxib (10− 10–10− 5 M) decreased the contractions in non-pregnant and 22-day-pregnant uteri. Tocopherol (10− 7 M) increased the relaxant effect only in pregnant uteri. Both diclofenac (10− 9–10− 5 M) and rofecoxib (10− 10–10− 5 M) reduced the tracheal tones, while they were slightly intensified by pretreatment with tocopherol (10− 7 M). Tocopherol enhanced the contractions of pregnant uteri. Tocopherol (10− 7 M) itself can induce the cyclooxygenase activity and shift the COX-1 and COX-2 ratio to COX-2. The lowest COX activity was found in non-pregnant uteri, while the highest one was in the trachea. Significance The COX enzymes, especially COX-2, play an important role in the contraction of pregnant uteri in rat. Tocopherol has a tissue specific COX-2 activity increasing effect in pregnant rat uterus but has no such action in non-pregnant uteri or tracheal tissue. Hereby, tocopherol may intensify selectively the uterine relaxing effect of COX-2 inhibitors in preterm contractions. However, tocopherol can enhance the contractile response of pregnant uterus that may increase the risk of premature contractions.

Original languageEnglish
Pages (from-to)199-204
Number of pages6
JournalLife Sciences
Volume192
DOIs
Publication statusPublished - Jan 1 2018

Fingerprint

Tocopherols
alpha-Tocopherol
Cyclooxygenase 2
Prostaglandin-Endoperoxide Synthases
Uterus
Rats
Tissue
Enzymes
Myometrium
Diclofenac
Trachea
In Vitro Techniques
Cyclooxygenase 1
Cyclooxygenase Inhibitors
Cyclooxygenase 2 Inhibitors
Enzyme activity
Succinic Acid
Enzyme Inhibitors
Vitamin E
Baths

Keywords

  • Cyclooxygenase
  • Myometrium
  • Pregnancy
  • Rat
  • Tocopherol
  • Trachea

ASJC Scopus subject areas

  • Biochemistry, Genetics and Molecular Biology(all)
  • Pharmacology, Toxicology and Pharmaceutics(all)

Cite this

Alpha-tocopherol succinate increases cyclooxygenase-2 activity : Tissue-specific action in pregnant rat uterus in vitro. / Kothencz, Anna; Hajagos-Tóth, Judit; Csányi, Adrienn; Gáspár, R.

In: Life Sciences, Vol. 192, 01.01.2018, p. 199-204.

Research output: Contribution to journalArticle

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