title: Antinociceptive effect of methanol extract of Celosia cristata Linn. in mice.
abstract: BACKGROUND
  Celosia cristata Linn. (Amaranthaceae) is used in traditional medicine for the treatment of headache, sores, ulcers, eye inflammations, skin eruption, painful menstruation and carpal tunnel syndrome. This study was performed to evaluate the antinociceptive activity of methanol extract of the whole plant of C. cristata (MECC).
  
  
  METHODS
  The evaluation of the antinociceptive effect of MECC was performed using thermal (hot plate, tail immersion test) and chemical (acetic acid, formalin, and glutamate-induced nociception test) pain models in mice at four different doses (50, 100, 200, 400 mg/kg; p.o.). Involvement of opioid receptors mediated central antinociceptive mechanism of MECC was evaluated using naloxone. Furthermore, the association of ATP-sensitive K+channel and cGMP pathway were evaluated using glibenclamide and methylene blue respectively.
  
  
  RESULTS
  Oral treatment of MECC produced significant, strong and dose-dependent central and peripheral antinociceptive effect in experimental pain models. MECC significantly increased the latency time of thermal threshold in both hot plate and tail immersion test. The inhibition of writhing syndrome by the extract in the acetic acid-induced writhing test was remarkable. MECC significantly reduced the formalin-induced neurogenic and inflammatory pain. In addition, the inhibition of glutamate-induced paw licking and edema by MECC was significant. The antinociceptive effect was significantly reversed by naloxone and glibenclamide, suggesting the association of opioid and ATP-sensitive K+channel system respectively. In addition, MECC also demonstrated the involvement of cGMP pathway in the antinociceptive action.
  
  
  CONCLUSIONS
  The study suggests that C. cristata possess significant antinociceptive effect which is associated with both central and peripheral mechanisms and provides a rationale for its extensive use at different painful conditions in traditional medicine.
authors: Department of Pharmacy, Stamford University Bangladesh, 51 Siddeswari Road, 1217, Dhaka, Bangladesh.
authors: Shanta
authors: S
authors: Islam
authors: Department of Pharmacy, Stamford University Bangladesh, 51 Siddeswari Road, 1217, Dhaka, Bangladesh. shafiullahshajib@gmail.com.
authors: Md Shafiullah
authors: MS
authors: Shajib
authors: Department of Pharmacy, Stamford University Bangladesh, 51 Siddeswari Road, 1217, Dhaka, Bangladesh.
authors: Tajnin
authors: T
authors: Ahmed
mesh_terms: D000700:Analgesics / Q000494:pharmacology*; D000818:Animals; D001522:Behavior, Animal / Q000187:drug effects; D034762:Celosia / Q000737:chemistry*; D008297:Male; D000432:Methanol; D051379:Mice; D059408:Pain Management; D010936:Plant Extracts / Q000494:pharmacology*; D010946:Plants, Medicinal / Q000737:chemistry
chemical_list: D000700:Analgesics; D010936:Plant Extracts; D000432:Methanol
keywords: Amaranthaceae; Antinociceptive; Celosia cristata Linn; Medicinal plant; Opioid system