Studies on Steroidogenic Potential of the Gregarine Stylocephalus conoidesDevdhar, 1962 (Protozoa: Sporozoa). A Cytochemical Study

Desai, R. N.; Nadkarni, V. B.

doi:10.1016/s0003-9365(87)80063-5

Cited by 3 publications

(3 citation statements)

References 2 publications

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“…Other works on eugregarines ( Stylocephalus conoides , S. mesomorphi , Gregarina cuneata , Hirmocystis speculitermis , Nematocystis magna , Didymophyes minuta ) documented acid phosphatase, alkaline phosphatase and β-glucuronidase activities in the pellicle and cytoplasm of their trophic vegetative stages [ 57 , 72 , 73 , 74 ]. In addition, lipids, cholesterol and the activity of the key enzymes involved in the biosynthesis of steroids have been revealed in S. conoides trophozoites [ 75 ]. In gregarine-like non-apicomplexan parasite D. oweni , the rhoptries persist in both the young and mature trophozoites, and it has been suggested that in attached D. oweni parasites, the rhoptries secrete enzymes into the host cell prior to digestion.…”

Section: The Niche and Feeding Strategies In Vegetative Stagesmentioning

confidence: 99%

Nutrient Acquisition and Attachment Strategies in Basal Lineages: A Tough Nut to Crack in the Evolutionary Puzzle of Apicomplexa

Valigurová

Florent

2021

Microorganisms

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Apicomplexa are unicellular eukaryotes that parasitise a wide spectrum of invertebrates and vertebrates, including humans. In their hosts, they occupy a variety of niches, from extracellular cavities (intestine, coelom) to epicellular and intracellular locations, depending on the species and/or developmental stages. During their evolution, Apicomplexa thus developed an exceptionally wide range of unique features to reach these diversified parasitic niches and to survive there, at least long enough to ensure their own transmission or that of their progeny. This review summarises the current state of knowledge on the attachment/invasive and nutrient uptake strategies displayed by apicomplexan parasites, focusing on trophozoite stages of their so far poorly studied basal representatives, which mostly parasitise invertebrate hosts. We describe their most important morphofunctional features, and where applicable, discuss existing major similarities and/or differences in the corresponding mechanisms, incomparably better described at the molecular level in the more advanced Apicomplexa species, of medical and veterinary significance, which mainly occupy intracellular niches in vertebrate hosts.

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Section: The Niche and Feeding Strategies In Vegetative Stagesmentioning

confidence: 99%

Nutrient Acquisition and Attachment Strategies in Basal Lineages: A Tough Nut to Crack in the Evolutionary Puzzle of Apicomplexa

Valigurová

Florent

2021

Microorganisms

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“…Steinernema carpocapsae were obtained from Becker Underwood Ltd, and subsequently maintained by passage through cockroach hosts in infection arena comprising a 275 ml plastic pot (Cater For You Ltd; 275 ml volume, 11.5 cm diameter Â 7.5 cm height) lined with Fluon, with a dampened sterile sand base initially inoculated with 50 nematodes cm 22 and with an initial 20 cockroaches placed in the arena. Infected cockroaches die within 72 h, and subsequently release new infective larvae onto the sand base.…”

Section: (B) Nematode Culturesmentioning

confidence: 99%

“…Cockroaches collected during the lipid assessment experiment (n ¼ 10 fed and n ¼ 10 starved; §2c(i)) were transferred to a nematode infection arena. The infection arenas were prepared by pipetting a solution of infective stage S. carpocapsae juveniles (5 ml, 50 nematodes cm 22 ) onto filter paper (90 mm diameter Whatmann) within a Fluon-lined pot. Hosts were exposed to nematodes for 72 h, during which time all the hosts died.…”

Section: (D) the Effect Of An Endemic Parasite On Steinernema Carpocapsae Transmission Potential (I) Host Starvation And Nematode Emergenmentioning

confidence: 99%

Endemic infection reduces transmission potential of an epidemic parasite during co-infection

et al. 2013

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Endemic, low-virulence parasitic infections are common in nature. Such infections may deplete host resources, which in turn could affect the reproduction of other parasites during co-infection. We aimed to determine whether the reproduction, and therefore transmission potential, of an epidemic parasite was limited by energy costs imposed on the host by an endemic infection. Total lipids, triacylglycerols (TAG) and polar lipids were measured in cockroaches (Blattella germanica) that were fed ad libitum, starved or infected with an endemic parasite, Gregarina blattarum. Reproductive output of an epidemic parasite, Steinernema carpocapsae, was then assessed by counting the number of infective stages emerging from these three host groups. We found both starvation and gregarine infection reduced cockroach lipids, mainly through depletion of TAG. Further, both starvation and G. blattarum infection resulted in reduced emergence of nematode transmission stages. This is, to our knowledge, the first study to demonstrate directly that host resource depletion caused by endemic infection could affect epidemic disease transmission. In view of the ubiquity of endemic infections in nature, future studies of epidemic transmission should take greater account of endemic co-infections.

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Histochemical Studies of Some Hydrolytic Enzymes in the Gregarine Digyalum oweni (Protozoa: Apicomplexa)

Dyson

Evennett

Grahame

1995

Archiv für Protistenkunde

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Studies on Steroidogenic Potential of the Gregarine Stylocephalus conoidesDevdhar, 1962 (Protozoa: Sporozoa). A Cytochemical Study

Cited by 3 publications

References 2 publications

Nutrient Acquisition and Attachment Strategies in Basal Lineages: A Tough Nut to Crack in the Evolutionary Puzzle of Apicomplexa

Nutrient Acquisition and Attachment Strategies in Basal Lineages: A Tough Nut to Crack in the Evolutionary Puzzle of Apicomplexa

Endemic infection reduces transmission potential of an epidemic parasite during co-infection

Histochemical Studies of Some Hydrolytic Enzymes in the Gregarine Digyalum oweni (Protozoa: Apicomplexa)

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