Effects of ricinoleic acid esters from castor oil of Ricinus communis on the vitellogenesis of Rhipicephalus sanguineus (Latreille, 1806) (Acari: Ixodidae) ticks

Arnosti, André; Brienza, Paula Desjardins; Furquim, Karim Christina Scopinho; Chierice, Gilberto Orivaldo; Bechara, Gervásio Henrique; Calligaris, Izabela Braggião; Camargo‐Mathias, Maria Izabel

doi:10.1016/j.exppara.2010.10.006

Cited by 51 publications

(37 citation statements)

References 11 publications

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“…In essence, these compounds prevented these cells from developing into viable individuals, corroborating the histological data of Arnosti et al (2011b).…”

Section: Discussionsupporting

confidence: 74%

Ultrastructural changes in the ovary cells of engorged Rhipicephalus sanguineus female ticks treated with esters of ricinoleic acid from castor oil (Ricinus communis)

Sampieri¹,

Arnosti²,

Nunes³

et al. 2011

Microscopy Res & Technique

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Rhipicephalus sanguineus is a widely distributed tick species that has adapted to the urban environment, and the dog is its main host. This species is also known as a vector and reservoir of diseases caused by bacteria, protozoa, and viruses. Currently, acaricides of synthetic chemical origin have been widely and indiscriminately used, leading to the development of resistance to these products by ticks and causing damage to the environment. Thus, these issues have made it necessary to seek other forms of controlling these ectoparasites. R. sanguineus was artificially infested in host New Zealand White rabbits, which were divided into four treatment groups: control (CG1 and CG2) and treatment (TG1 and TG2) groups. TG1 and TG2 hosts were provided with feed supplemented with esters of ricinoleic acid from castor oil at a concentration of 5 g/kg of feed for 7 and 15 days. Afterward, the ovaries of the female ticks were removed for analysis by transmission electron microscopy. The results showed ultrastructural changes in the somatic and germ cells of ovaries from TG1 and TG2 females, particularly with respect to chorion deposition, a protective membrane of the oocyte, as well as in the transport process of vitellogenic materials via the hemolymph and pedicel cells. Moreover, the mitochondria were less electron-dense and had cristae that were more disorganized than the mitochondria from CG1 and CG2 individuals. Thus, this study demonstrated the action of esters on the ovaries of R. sanguineus, signaling the prospect of a way to control this ectoparasite without affecting nontarget organisms or the environment.

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“…In essence, these compounds prevented these cells from developing into viable individuals, corroborating the histological data of Arnosti et al (2011b).…”

Section: Discussionsupporting

confidence: 74%

Ultrastructural changes in the ovary cells of engorged Rhipicephalus sanguineus female ticks treated with esters of ricinoleic acid from castor oil (Ricinus communis)

Sampieri¹,

Arnosti²,

Nunes³

et al. 2011

Microscopy Res & Technique

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“…This is particularly noticeable in many studies which aimed to evaluate the morphological effects of substances with acaricide potential on ticks, especially R. sanguineus, considering its great veterinary importance. Synthetic compounds such as fipronil (Oliveira et al 2008(Oliveira et al , 2009 and permethrin (Roma et al 2010a(Roma et al ,b, 2011, and natural ones such as andiroba oil (Vendramini et al 2012;Roma et al 2013a), the esters of ricinoleic acid of castor oil (Arnosti et al 2011;Sampieri et al 2012) and neem leaves extract (Denardi et al 2010(Denardi et al , 2011(Denardi et al , 2012 caused expressive structural alterations in the reproductive system of these ticks, such as irregularity of the oocytes, cytoplasmic vacuolation, alterations in the organelles, nuclear and nucleolar damages, and modifications in the yolk synthesis.…”

Section: Discussionmentioning

confidence: 99%

Morphological effects of neem (Azadirachta indica A. Juss) seed oil with known azadirachtin concentrations on the oocytes of semi-engorged Rhipicephalus sanguineus ticks (Acari: Ixodidae)

et al. 2014

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The concern about the harmful effects caused by synthetic pesticides has led to the search for safe and ecological alternatives for pest control. In this context, the neem tree (Azadirachta indica) stands out due to its repellent properties and effects on various arthropods, including ticks. For this reason, this study aimed to demonstrate the potential of neem as a control method for Rhipicephalus sanguineus ticks, important vectors of diseases in the veterinary point of view. For this, R. sanguineus semi-engorged females were subjected to treatment with neem seed oil enriched with azadirachtin, its main compound, and ovaries were assessed by means of morphological techniques in conventional light microscopy, confocal laser scanning microscopy, and transmission electron microscopy. Neem demonstrated a clear dose-dependent effect in the analyzed samples. The observed oocytes presented, especially in the groups treated with higher concentrations of neem oil, obvious signs of cytoplasmic disorganization, cellular vacuolization, nuclear and nucleolar irregularity, dilation in mitochondrial cristae, alterations in mitochondrial matrix, and swelling of rough endoplasmic reticulum. Intracellular microorganisms were observed in all analyzed groups, reinforcing the importance of ticks in the transmission of pathogens. A greater quantity of microorganisms was noted as the concentration of neem increased, indicating that the damaged oocytes may be more susceptible for their development. Such morphological alterations may promote future damages in reproductive performance of these animals and demonstrate the potential of neem seed oil for the control of R. sanguineus ticks, paving the way for new, cheaper, and safer methods of control.

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“…The castor oil consisted of 88.04% ricinoleic acid; and the effects of the ricinoleic acid on the morphophysiology of the ovaries and the salivary glands of Rhipicephalus sanguineus (Latreille) (Acari: Ixodidae) led to the avoidance of two important processes: reproduction and feeding (Arnosti et al, 2011a(Arnosti et al, , 2011bSampieri et al, 2013).…”

Section: Resultsmentioning

confidence: 99%

<b>Control of coffee berry borer, <i>Hypothenemus hampei</i> (Ferrari) (Coleoptera: Curculionidae: Scolytinae) with botanical insecticides and mineral oils

et al. 2016

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ABSTRACT. The objective of this study was to evaluate botanical oils, mineral oils and an insecticide that contained azadirachtin (ICA) for the control of Hypothenemus hampei, in addition to the effects of residual castor oil. We evaluated the effectiveness of the vegetable oils of canola, sunflower, corn, soybean and castor, two mineral oils (assist ® and naturol ® ), and the ICA for the control of H. hampei. The compounds were tested at a concentration of 3.0% (v v -1 ). The median lethal concentration (LC 50 ) was estimated with Probit analysis. The oil of castor bean and extract of castor bean cake were also evaluated at concentrations of 3.0% (v v -1 ) and 3.0% (m v -1 ), respectively. The mortality rates for H. hampei caused by the ICA and the castor oil were 40.8 and 53.7%, with LC 50 values of 6.71 and 3.49% (v v -1 ), respectively. In the castor oil, the methyl esters of the fatty acids were palmitic (1.10%), linoleic (4.50%), oleic (4.02%), stearic (0.50%) and ricinoleic acids (88.04%). The extract of the castor bean cake was not toxic to H. hampei. The persistence of the castor oil in the environment was low, and the cause of mortality for H. hampei was most likely the blockage of the spiracles, which prevented the insects from breathing. ), respectivamente. No óleo de mamona foram identificados os ésteres metílicos dos ácidos graxos: palmítico (1,10%), linoleico (4,50%), oleico (4,02%), esteárico (0,50%) e ricinoleico (88,04%). O extrato da torta da semente de mamona não apresentou toxicidade sobre H. hampei. O óleo de mamona apresentou baixa persistência no ambiente. O óleo de mamona causou a mortalidade de H. hampei, sendo provavelmente devido ao bloqueio dos espiráculos, impedindo a respiração desse inseto.

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Effects of ricinoleic acid esters from castor oil of Ricinus communis on the vitellogenesis of Rhipicephalus sanguineus (Latreille, 1806) (Acari: Ixodidae) ticks

Cited by 51 publications

References 11 publications

Ultrastructural changes in the ovary cells of engorged Rhipicephalus sanguineus female ticks treated with esters of ricinoleic acid from castor oil (Ricinus communis)

Ultrastructural changes in the ovary cells of engorged Rhipicephalus sanguineus female ticks treated with esters of ricinoleic acid from castor oil (Ricinus communis)

Morphological effects of neem (Azadirachta indica A. Juss) seed oil with known azadirachtin concentrations on the oocytes of semi-engorged Rhipicephalus sanguineus ticks (Acari: Ixodidae)

<b>Control of coffee berry borer, <i>Hypothenemus hampei</i> (Ferrari) (Coleoptera: Curculionidae: Scolytinae) with botanical insecticides and mineral oils

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