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295043 occurrences (No.82 in the rank) during 5 years in the PubMed. [no cache] 500 found

227) Glial cell activation and oxidative stress are important factors in the induction of opioid side effects such as tolerance and dependence.

--- ABSTRACT ---

PMID:23943205 DOI:10.1007/s11418-013-0796-6

2015 Journal of natural medicines

* Satureja khuzestanica prevents the development of morphine analgesic tolerance through suppression of spinal glial cell activation in rats.

- Glial cell activation and oxidative stress are important factors in the induction of opioid side effects such as tolerance and dependence. It has been demonstrated that Satureja khuzistanica extract (SKE) has antioxidative, antinociceptive and anti-inflammatory properties; however, its influences on opioid analgesic tolerance have not yet been clarified. Adult male Wistar rats were rendered analgesic-tolerant by injection of 10 mg/kg morphine twice daily for 8 days. To determine the effect of SKE on the development of morphine tolerance, different doses of SKE (25, 50 and 100 mg/kg i.p.) were injected simultaneously with morphine. The tail-flick test was used to assess the nociceptive threshold. The lumbar spinal cord was assayed to determine glial fibrillary acidic protein (GFAP) and tumor necrosis factor alpha (TNFα) levels by the Western blotting method. Our results showed that chronic morphine produced tolerance to the antinociceptive effect of morphine. However, SKE could prevent, in a dose-dependent manner, morphine tolerance development. In tolerant animals, a significant increase in GFAP and TNFα levels was observed in the lumbar spinal cord, and was reversed to control levels by 100 mg/kg SKE. Our data revealed that Satureja khuzistanica had beneficial effects in preventing opioid tolerance and the underlying mechanisms of those effects may be due, at least in part, to reduce spinal glial cell activation.

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(1)62 for	(12)10 related	(23)3 using	(34)2 during
(2)44 null	(13)8 on	(24)3 which	(35)2 from
(3)36 that	(14)7 have	(25)3 with	(36)2 including
(4)34 associated	(15)7 such	(26)2 (age,	(37)2 independently
(5)31 and	(16)6 may	(27)2 along	(38)2 involved
(6)29 in	(17)4 influence	(28)2 as	(39)2 jointly
(7)20 were	(18)4 significantly	(29)2 c-Jun	(40)2 other
(8)14 influencing	(19)4 to	(30)2 can	(41)2 produced
(9)13 are	(20)3 across	(31)2 contribute	(42)2 was
(10)13 of	(21)3 among	(32)2 contributing
(11)10 affecting	(22)3 like	(33)2 diagnostic

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--- WordNet output for factors --- Overview of noun factor The noun factor has 7 senses (first 4 from tagged texts) 1. (31) factor -- (anything that contributes causally to a result; "a number of factors determined the outcome") 2. (8) component, constituent, element, factor, ingredient -- (an abstract part of something; "jealousy was a component of his character"; "two constituents of a musical composition are melody and harmony"; "the grammatical elements of a sentence"; "a key factor in her success"; "humor: an effective ingredient of a speech") 3. (4) divisor, factor -- (one of two or more integers that can be exactly divided into another integer; "what are the 4 factors of 6?") 4. (1) agent, factor, broker -- (a businessman who buys or sells for another in exchange for a commission) 5. factor -- (any of the numbers (or symbols) that form a product when multiplied together) 6. factor -- (an independent variable in statistics) 7. gene, cistron, factor -- ((genetics) a segment of DNA that is involved in producing a polypeptide chain; it can include regions preceding and following the coding DNA as well as introns between the exons; it is considered a unit of heredity; "genes were formerly called factors") Overview of verb factor The verb factor has 3 senses (first 1 from tagged texts) 1. (2) factor, factor in, factor out -- (resolve into factors; "a quantum computer can factor the number 15") 2. factor -- (be a contributing factor; "make things factor into a company's profitability") 3. factor, factor in, factor out -- (consider as relevant when making a decision; "You must factor in the recent developments") --- WordNet end ---