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Updated: Mar 6, 2026
Monitoring Heart Function in Larval Drosophila melanogaster for Physiological Studies
Published on: November 16, 2009
Formation and function of intracardiac valve cells in the Drosophila heart
Kay Lammers1, Bettina Abeln1, Mirko Hüsken1
1University of Osnabrück, Department of Zoology and Developmental Biology, Barbarastraße 11, Osnabrueck 49076, Germany.
Insights
Fruit fly heart valves use specialized cells with unique organelles to control haemolymph flow. These valve cells change shape with each heartbeat, ensuring unidirectional circulation.
Area of Science:
- Cardiovascular Biology
- Developmental Biology
- Cell Biology
Background:
- The Drosophila heart, a simple tubular structure, relies on intracardiac valves for unidirectional haemolymph circulation.
- These valves, composed of specialized cardiomyocytes, are crucial for preventing backflow and ensuring efficient fluid transport.
Purpose of the Study:
- To investigate the cellular mechanisms underlying the function of Drosophila heart valves.
- To identify novel markers for valve cell differentiation and characterization.
Main Methods:
- Real-time characterization of valve cell behavior during the heartbeat cycle.
- Histological analysis to identify unique cellular structures within valve cells.
- Identification of novel genetic markers for valve cells.
Main Results:
- Drosophila heart valves open and close the heart lumen through a unique myofibrillar arrangement and large endocytic vesicles.
- Valve cells exhibit dynamic, oscillating shape changes synchronized with the heartbeat, enabling valve function.
- Novel markers for valve cells were identified, facilitating future research.
Conclusions:
- Specialized valve cells in the Drosophila heart possess unique organelles and myofibrillar structures essential for regulating haemolymph flow.
- The dynamic shape changes of these cells are critical for the opening and closing mechanism of the heart lumen.
- The identified markers will aid in future studies of valve cell development and function.
Abstract:
Drosophila harbours a simple tubular heart that ensures haemolymph circulation within the body. The heart is built by a few different cell types, including cardiomyocytes that define the luminal heart channel and ostia cells that constitute openings in the heart wall allowing haemolymph to enter the heart chamber. Regulation of flow directionality within a tube, such as blood flow in arteries or insect haemolymph within the heart lumen, requires a dedicated gate, valve or flap-like structure that prevents backflow of fluids. In the Drosophila heart, intracardiac valves provide this directionality of haemolymph streaming, with one valve being present in larvae and three valves in the adult fly. Each valve is built by two specialised cardiomyocytes that exhibit a unique histology. We found that the capacity to open and close the heart lumen relies on a unique myofibrillar setting as well as on the presence of large membranous vesicles. These vesicles are of endocytic origin and probably represent unique organelles of valve cells. Moreover, we characterised the working mode of the cells in real time. Valve cells exhibit a highly flexible shape and, during each heartbeat, oscillating shape changes result in closing and opening of the heart channel. Finally, we identified a set of novel valve cell markers useful for future in-depth analyses of cell differentiation in wild-type and mutant animals.
