Nucleic acid synthesis during insect development—II. Control of DNA synthesis in the Cecropia silkworm and other Saturniid moths

Krishnakumaran, A.; Berry, Spencer J.; Oberlander, Herbert; Schneiderman, Howard A.

doi:10.1016/0022-1910(67)90002-9

Cited by 142 publications

(20 citation statements)

References 57 publications

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“…Because the patterns of proliferation are so similar in normal and unafferented lobes, it is likely that the patterns reflect a more general regulatory process. For example, glial cell division may be regulated specifically by ecdysteroids, which play a major role in choreographing metamorphic events and are known to affect mitotic cycles (Bowers and Williams, 1964;Courgeon, 1972;Krishnakumaran et al, 1967;Oberlander, 1972;Stevens et al, 1980). Combining the present results with those of our previous studies Tolbert, 1987, 1988), we conclude that antennal sensory axons induce the formation of glomeruli primarily by eliciting changes in glial morphology and distribution, not by stimulating glial proliferation.…”

Section: Discussionsupporting

confidence: 83%

Patterns of glial proliferation during formation of olfactory glomeruli in an insect

Oland

Tolbert

1989

Glia

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Partitioning of the first-order olfactory neuropil into glomeruli in the developing brain of the moth Manduca sexta occurs only in the presence of olfactory sensory axons and appears to be mediated by changes in glial cells (Oland et al.: J. Neurosci., 8:353-367, 1988). The arrival of sensory axons in the brain triggers changes in glial shape and position that lead to the formation of a glial scaffolding for the developing glomeruli. The presence of mitotic figures in glial cells at stages before glomeruli emerge (Oland and Tolbert: J. Comp. Neurol., 255:196-207, 1987) suggested that glial proliferation might also contribute to the formation of the glomerular envelopes. To determine whether glial proliferation is induced by olfactory axons, we have used 3H-thymidine to label dividing cells before, during, and after the formation of glomeruli and have compared the patterns of proliferation in normal and chronically unafferented olfactory neuropils. We found significant differences in mitotic indices only after glomerular walls had been established, indicating that the sensory axons induce the formation of glomerular envelopes primarily via the changes in glial morphology and distribution, not by stimulating glial proliferation.

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Section: Discussionsupporting

confidence: 83%

Patterns of glial proliferation during formation of olfactory glomeruli in an insect

Oland

Tolbert

1989

Glia

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“…Bowers and Williams (1964). Krishnakumaran et al (1967) and Riddiford and Ajarni (1973) believe that in Manduca sexta, maximal sensitivity to exogenous JH occurs at the beginning of epidermal retraction which is immediately followed by DNA synthesis, prerequisite to the formation of adult cuticle. Thus, according to this view, in order to be effective an increased titre of JH{JHA should be available in the insect system and it should start action before the process of cellular differentiation is set into motion, probably at a time when the gene sets are being reprogrammed for a new developmental cycle.…”

Section: Morphogenetic Response In Relation To Dosementioning

confidence: 99%

A study of pupal-adult intermediates produced with juvenoid treatment ofSpodoptera litura Fabr. pupae

Srivastava

Prasad

1982

Proc Ani Sci

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Pupae of Spodoptera litura were treated topically with a juvenoid , 6, 7_ epoxy-J-ethyl-I (p-ethyl phenoxy}? methylnonane. The effects comprised death, production of pupal-adult intermediates of varying grades and adultoids. The production of pupal-adult intermediates was studied in relation to age of the pupa at the time of treatment and the dose of the compound administered. It was found that up to the age of 20 hr the degree of morphogenetic response was directly correlated with the dose ·of the compound administered and inversely with age, but after this age, an increase in the quantity of the hormone, beyond the effective dose did not further augment the effect.

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“…Berry et al (1967) reported that in the saturniid moths the rate of RNA synthesis differed not only between tissues of one developmental stage, but also within a given tissue at different developmental stages. For example, fat body RNA synthesis was observed to be highest during the larval stage, decreased during the pupal stage, reached its lowest level during diapause and then increased temporarily at the initiation of adult development.…”

Section: Literature Reviewmentioning

confidence: 99%

“…Price (1965) reported that the concentration of RNA.P in the fat body was greater than that in the cutaneous muscles and cuticle as expressed in yg/mg wet weight of tissue. Krishnakumaran et al (1967) observed in Polyphemus larvae that each tissue has its own characteristic temporal pattern of thymidine incorporation or DNA synthesis and distinguished three patterns of DNA synthesis:…”

Section: Literature Reviewmentioning

confidence: 99%

“…The insect endocrine system typically consists of the brain, prothoracic glands, corpora allata, and subeosophageal ganglion, and to some extent the corpora cardiaca. Ecdysone, which is also known as the molting hormone and which is secreted by the prothoracic glands, stimulates the synthetic activities necessary for postembryonic develop ment and molting (Wigglesworth 1967;Krishnakumaran et al 1967).…”

Section: Introduction 1 Introductionmentioning

confidence: 99%

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The influence of temperature and thermal history on total RNA, DNA and protein levels of the house fly Musca domestica

Rogers

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INFORMATION TO USERSThis material was produced from a microfilm copy of the original document. While the most advanced technological means to photograph and reproduce this document have been used, the quality is heavily dependent upon the quality of the original submitted.The following explanation of techniques is provided to help you understand markings or patterns which may appear on this reproduction.

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Nucleic acid synthesis during insect development—II. Control of DNA synthesis in the Cecropia silkworm and other Saturniid moths

Cited by 142 publications

References 57 publications

Patterns of glial proliferation during formation of olfactory glomeruli in an insect

Patterns of glial proliferation during formation of olfactory glomeruli in an insect

A study of pupal-adult intermediates produced with juvenoid treatment ofSpodoptera litura Fabr. pupae

The influence of temperature and thermal history on total RNA, DNA and protein levels of the house fly Musca domestica

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