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Hassaneen E, El-Din Sallam A, Abo-Ghalia A, Moriyama Y, Karpova SG, Abdelsalam S, Matsushima A, Shimohigashi Y, Tomioka K. Pigment-Dispersing Factor Affects Nocturnal Activity Rhythms, Photic Entrainment, and the Free-Running Period of the Circadian Clock in the Cricket Gryllus bimaculatus. J Biol Rhythms 2011; 26:3-13. [DOI: 10.1177/0748730410388746] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
Pigment-dispersing factor (PDF) is a neuropeptide widely distributed in insect brains and plays important roles in the circadian system. In this study, we used RNA interference to study the role of the pigment-dispersing factor ( pdf) gene in regulating circadian locomotor rhythms in the cricket, Gryllus bimaculatus. Injections of pdf double-stranded RNA (ds pdf) effectively knocked down the pdf mRNA and PDF peptide levels. The treated crickets maintained the rhythm both under light-dark cycles (LD) and constant darkness (DD). However, they showed rhythms with reduced nocturnal activity with prominent peaks at lights-on and lights-off. Entrainability of ds pdf-injected crickets was higher than control crickets as they required fewer cycles to resynchronize to the LD cycles shifted by 6 h. The free-running periods of the ds pdf-injected crickets were shorter than those of control crickets in DD. These results suggest that PDF is not essential for the rhythm generation but involved in control of the nocturnality, photic entrainment, and fine tuning of the free-running period of the circadian clock.
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Affiliation(s)
- Ehab Hassaneen
- Graduate School of Natural Science and Technology, Okayama University, Okayama, Japan, Zoology Department, Faculty of Science, Suez Canal University, Ismailia, Egypt
| | - Alaa El-Din Sallam
- Zoology Department, Faculty of Science, Suez Canal University, Ismailia, Egypt
| | - Ahmad Abo-Ghalia
- Zoology Department, Faculty of Science, Suez Canal University, Ismailia, Egypt
| | - Yoshiyuki Moriyama
- Graduate School of Natural Science and Technology, Okayama University, Okayama, Japan
| | - Svetlana G. Karpova
- Graduate School of Natural Science and Technology, Okayama University, Okayama, Japan
| | - Salah Abdelsalam
- Graduate School of Natural Science and Technology, Okayama University, Okayama, Japan
| | | | | | - Kenji Tomioka
- Graduate School of Natural Science and Technology, Okayama University, Okayama, Japan,
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El-Shenawy N, Saleh Ahme R, Ismail F, Abo-Ghalia A. Evaluation of the Efficiency of Wastewater Treatment and Use of Chironomus calipterus (Diptera: Chironomidae) as a Bioindicator in El-Tall El-Keber, Egypt. ACTA ACUST UNITED AC 2010. [DOI: 10.3923/jfas.2010.94.105] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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Soliman B, Abo-Ghalia A, Merdan A, Shoukry A. Melanization response of two mosquito species against Wuchereria bancrofti. J Egypt Soc Parasitol 1992; 22:469-77. [PMID: 1500787] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
The melanization response of two mosquito against Wuchereria bancrofti was studied under different conditions of temperatures, adult age and feeding regimes. The two mosquito species were Culex pipiens, a susceptible species for W. bancrofti transmission and Aedes Caspius, a refractory one.
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Affiliation(s)
- B Soliman
- Department of Zoology, Faculty of Al Arish Education, Suez Canal University, Ismailia, Egypt
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