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Light activation of phospholipase A2 in the photoreceptor of the crayfish (Procambarus clarkii)

100%

Kashiwagi T., Meyer-Rochow V. B., Nishimura K., Eguchi E.

Acta Neurobiologiae Experimentalis

2000

vol. 60

issue 1

9-16

Retinal lipids of crayfish, kept at 4oC under continuous darkness for 3 weeks, consisted mainly of phosphatidylcholine (PC) and phosphatidylethanolamine (PE); sphingomyelin (SM), phosphatidylinositol (PI) and phosphatidylserine (PS) were minor contributors. PI, involved in the phototransduction cascade, never reached greater concentrations than 7% of the total. High concentrations of polyunsaturated fatty acids (PUFA) such as 20:4n-6, 20:5n-3 and 22:6n-3 (DHA, docosahexaenoic acid) were present in PC, PE and PS, but scarce in SM and PI. In retinae of crayfish kept at 4oC in darkness for 3 weeks and then exposed to white light (6 h; ca. 4,500 lx), SM and PS remained seemingly unaffected. PC, however, significantly decreased within 10 min to 65% of the initial value and 50% at 180 min. To study the reduction of PC, lipids of retinae suspended in physiological solution with/without phospholipase C (PLC) and phospholipase A2 (PLA2) inhibitors such as DMDA (=DEDA), manoalide, ET-18-OCH3, and U-73122 were measured. Only free fatty acids (FFA) of retinae with inhibitors of PLA2 like DMDA and manoalide decreased. Retinae irradiated by white light for 3 h displayed a significant reduction of PC, compared with those that had remained in continuous darkness. However, the PC of retinae with PLA2-inhibitors was not decreased by light. Our results provide evidence that not only photoreceptor cell PLC, but also PLA2 is activated by light.

Superconductivity of MgB2 Composited with Mg-Zn Alloys

76%

Kawabata T., Namiki T., Matsuda K., Tokai D., Murakami S., Nishimura K.

Archives of Metallurgy and Materials

2013

issue 2

Solute-Vacancy Clustering In Al-Mg-Si Alloys Studied By Muon Spin Relaxation Technique

64%

Nishimura K., Matsuda K., Komaki R., Nunomra N., Wenner S., Holmestad R., Matsuzaki T., Watanabe I., Pratt F. L.

Archives of Metallurgy and Materials

2015

issue 2

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2 Archives of Metallurgy and Materials

1 Acta Neurobiologiae Experimentalis

1 2015

1 2013

1 2000

3 Nishimura K.

2 Matsuda K.

1 Eguchi E.

1 Holmestad R.

1 Kashiwagi T.

1 Kawabata T.

1 Komaki R.

1 Matsuzaki T.

1 Meyer-Rochow V. B.

1 Murakami S.

1 Namiki T.

1 Nunomra N.

1 Pratt F. L.

1 Tokai D.

1 Watanabe I.

1 Wenner S.

Search results

Light activation of phospholipase A2 in the photoreceptor of the crayfish (Procambarus clarkii)

Superconductivity of MgB2 Composited with Mg-Zn Alloys

Solute-Vacancy Clustering In Al-Mg-Si Alloys Studied By Muon Spin Relaxation Technique