Adult Pattern Of Distribution Research Articles

Residuales und rekonvertiertes hämatopoetisches Knochenmark im distalen Femur

The distal femur contains usually only fatty marrow in the adult. We investigated the incidence of areas of residual and reconverted hematopoietic marrow in the distal femur in a series of 50 adult patients using conventional spin-echo and opposed-phase gradient-echo MR images. Zones with intermediate to low signal intensity in both sequences representing hematopoietic marrow within high signal intensity fatty marrow were observed in 17 of the 50 patients. Opposed-phase gradient-echo sequences demonstrated significantly greater red-yellow marrow contrast than conventional spin-echo sequences. Residual red marrow may represent a biologic variation of the normal adult pattern of red-yellow marrow distribution in women of menstruating age. Reconverted red marrow appears to be related to increased erythrocyte demand. It should not be mistaken for bone marrow malignancy. Absence of epiphyseal involvement, cortical destruction and soft-tissue mass in residual and reconverted hematopoietic marrow are helpful differential criteria.

Appearance and transient expression of vasopressin and oxytocin receptors in the rat brain.

Binding sites for AVP and for OT were studied by in vitro autoradiography in sections from the brain of rat fetuses, neonates and infants; their distribution was compared to that of the brain of adults. Specific binding sites were first detected in the vagal complex for OT and in the reticular formation for AVP at E14 and E16 respectively. In the perinatal period, other areas become labeled. Approximately one week after birth, a "stable" pattern of distribution is established for AVP binding sites, and a different "stable" pattern obtained for OT binding sites. For both types of sites and in many areas, the density of labeling increases during the next two weeks to reach adult levels, whereas labeling decreases concomitantly in other areas of the brain. The distribution of AVP binding sites is of the adult pattern by the time of weaning. In contrast, the adult pattern of distribution of OT binding sites is only established after puberty, when new OT receptors appear in some regions of the hypothalamus and basal forebrain. "Transient" binding sites for AVP and OT, i.e. sites located in areas which were labeled in neonates but not in weanlings, were shown to have the same ligand affinity than the binding sites present in the adult. Electrophysiological studies suggest that at least some of these "transient" binding sites represent authentic receptors and may be involved in neuronal signaling.

The early development of retinal ganglion cells with uncrossed axons in the mouse: retinal position and axonal course

The carbocyanine dye, DiI, has been used to study the retinal origin of the uncrossed retinofugal component of the mouse and to show the course taken by these fibres through the optic nerve and chiasm during development. Optic axons first arrive at the chiasm at embryonic day 13 (E13) but do not cross the midline until E14. After this stage, fibres taking an uncrossed course can be selectively labelled by unilateral tract implants of DiI. The earliest ipsilaterally projecting ganglion cells are located in the dorsal central retina. The first sign of the adult pattern of distribution of ganglion cells with uncrossed axons located mainly in the ventrotemporal retina is seen on embryonic day 16.5, thus showing that the adult line of decussation forms early in development. A small number of labelled cells continue to be found in nasal and dorsal retina at all later stages. At early stages (E14-15), retrogradely labelled uncrossed fibres are found in virtually all fascicles of the developing nerve, intermingling with crossed axons throughout the length of the nerve. At later stages of development (E16-17), although uncrossed fibres pass predominantly within the temporal part of the stalk, they remain intermingled with crossed axons. A significant number of uncrossed axons also lie within the nasal part of the optic stalk. The position of uncrossed fibres throughout the nerve in the later developmental stages is comparable to that seen in the adult rodent (Baker and Jeffery, 1989). The distribution of uncrossed axons thus indicates that positional cues are not sufficient to account for the choice made by axons when they reach the optic chiasm.

Influence of colonizing micro-flora on the mucin histochemistry of the neonatal mouse colon

Mucin histochemistry on sections of colon from germ-free and conventional mouse pups showed that all goblet cell mucins were sulphated at birth. During the first two weeks of post natal development, the pattern of mucin production in the ascending colon changed to a distribution of non-sulphated mucins towards the apical zone of the crypts and sulphated sialomucins basally. In conventional animals during the third postnatal week when the complex micro-flora of the colon was becoming established, the typical adult mucin distribution pattern developed, with sulphated mucins now confined to the upper third of the crypt. However, in the absence of a colonizing micro-flora crypt mucins become more and more sulphated until at weaning, most goblet cells of the ascending colon were producing fully or partially sulphated mucins, except for one or two cells at the very base of the crypt.

Distribution and ontogeny of chromogranin A and tyrosine hydroxylase in the carotid body and glomus cells located in the wall of the common carotid artery and its branches in the chicken

Development and distribution of chromogranin A and tyrosine hydroxylase in the carotid body and glomus cells located in and around arteries were examined in chickens at various developmental stages by an immunohistochemical staining. In 9-day-old embryos, numerous cells immunoreactive for tyrosine hydroxylase were already detected in the connective tissue surrounding the carotid body. Some of these cells also showed immunoreactivity for chromogranin A. At 10 days of incubation, a few cells immunoreactive for tyrosine hydroxylase and chromogranin A were detected within the carotid body parenchyma. At 12 days of incubation, almost all glomus cells of the carotid body were intensely immunoreactive for these substances. Furthermore, numerous tyrosine hydroxylase- and chromogranin A-immunoreactive cells were observed in the wall of the common carotid artery, along the whole length of the carotid body artery, and around the roots of the inferior thyroid artery, the ascending esophageal artery and the esophagotracheobronchial artery; the cells already exhibited adult pattern of distribution at this stage of development. Thereafter, glomus cells immunoreactive for both substances gradually increased in number and in intensity of immunoreactivity with age, although the cells located in the wall of the common carotid artery lost immunoreactivity for tyrosine hydroxylase after hatching.

Larval habitat selection in Crepidula (L.) and its effect on adult distribution patterns

Larval settlement and metamorphosis of the marine gastropods Crepidula fornicata (L.) and Crepidula plana Say were investigated to determine the ecological role of larval habitat selection. Field studies conducted during June (prerecruitment sample) and August (during recruitment) established the aggregative dispersion of these species on discrete hard substrata. Differences in the types of Crepidula- occupied substrata from June to August provided evidence for enhanced mortality of Crepidula spp. juveniles that colonized suboptimal substrata. This source of differential mortality implies a risk involved in random settlement, hence selection for the utilization of settlement cues. Laboratory experiments were conducted to test the response (metamorphosis) of Crepidula larvae to a variety of potential inducers. These bioassays demonstrate that metamorphosis of Crepidula larvae can be induced by a water-soluble chemical (or possibly chemicals) associated with adults. This finding, which is complemented by field studies showing significant positive effects of Crepidula occupancy on larval recruitment to experimental substrata, indicates that Crepidula larvae settle gregariously. In addition, larvae are capable of responding to other ecologically relevant species to find a habitat suitable for settlement and survival. We conclude that the aggregative dispersion of C. fornicata and C. plana on discrete substrata can be explained by the results of selective larval settlement which are accentuated by differential mortality of postmetamorphic individuals.

Thyroid function and immune reactivity during metamorphosis in Xenopus laevis, the South African clawed toad

High plasma titers of thyroid and adrenocorticoid hormones are present during the metamorphosis of Xenopus laevis. Here we examine the influence of thyroid hormones on several features of immune reactivity during this period; e.g., the capacitiy of thymusderived immunocytes to reduce (immune suppression) or amplify (helper function) antibody production. Further, we test whether thyroid hormone is able to modulate the expression of putative interleukin 2 (IL-2) receptors on lectin-activated adult Xenopus splenocytes, an aspect of helper function. Finally, we have tested the ability of thyroid hormones to affect larval antibody-producing cells directly. Our data suggest that all three functions (suppressor, helper, and antibody producing) are independent of thyroid function during metamorphosis. However, the anatomical distribution of two features of immune suppression, as well as the numbers of lectin-activated splenocytes able to bind anti-IL-2 receptor antibody, were changed by thyroid function. In vivo thyroid blockade by thiourea prevented the transition from the premetamorphic to the adult pattern of distribution of the two suppressor functions; triiodothyronine in vitro stimulated an increase in the numbers of cells able to bind an IL-2 receptor antibody.

Development of somatostatin-like immunoreactivity in the hippocampal formation of normal and reeler mice

Using antisera directed against somatostatin-28 or somatostatin-28(1–12), the development of somatostatin-like immunoreactivity (SS-LI) was examined in the hippocampal formation of normal and reeler mice. As early as postnatal day 5, SS-labeled neurons exhibit the adult pattern of distribution in the normal hippocampal formation, these neurons being situated predominantly in the stratum oriens of the hippocampus and the hilus of the dentate gyrus. In contrast, SS-labeled neurons in the reeler hippocampal formation are dispersed throughout the various layers, reflecting the disrupted laminar organization of the hippocampus in this mutant. In both the normal and reeler hippocampal formation, SS-labeled fibers are most abundant in the stratum lacunosum moleculare. However, in the reeler, there appears to be increase in the density of SS-LI fibers, not only in the stratum lacunosum moleculare but also in the stratum oriens, stratum radiatum and pyramidal cell layer of the hippocampus.

A temporal analysis of the origin and distribution of serotoninergic afferents in the cerebellum of pouch young opossums

In the present study, a temporal analysis of the pattern of distribution of serotoninergic fibers and varicosities within the cerebellum of pouch young opossums was carried out. Particular attention was focused on animals ranging in age from postnatal day (PD) 21-PD 72, because there is a transient expression of serotonin immunoreactivity in the cerebellar cortex during that interval. Between PD 1-33, there is a progressive increase in serotoninergic immunoreactivity throughout the cerebellar cortex. After PD 33, there is a decrease in the relative number of immunostained fibers followed by a reorganization into the adult pattern of distribution. A double labeling paradigm, in which horseradish peroxidase, used as a retrograde marker, combined with serotonin immunohistochemistry was employed to localize serotoninergic neurons that project to the developing cerebellum. Initially (PD 9), serotoninergic cells in the medullary reticular formation and dorsolateral pontine tegmentum are double labeled. After PD 77, only neurons in the medullary reticular formation were double labeled. The course taken by serotoninergic axons from the brainstem to the cerebellum also was analyzed. Between PD 1 and PD 42, serotoninergic axons enter the cerebellum via four different routes: 1) the inferior cerebellar peduncle; 2) a pathway located lateral and rostral to the inferior cerebellar peduncle; this bundle of serotonin axons contains immunoreactive fibers that also enter the tectum (this tract is referred to as the tecto-cerebellar bundle in this report); 3) the medial aspect of the superior cerebellar peduncle; and 4) the tela choroidea. After PD 40, the latter two pathways are the primary routes by which serotoninergic fibers enter the cerebellum. The loss of serotoninergic fibers in the first two pathways coincides with the decrease in serotoninergic immunoreactivity seen in the cerebellar cortex described above. In summary, the results suggest that the serotoninergic projection to the opossum's cerebellum is remodelled during development. It is proposed that the serotonin fibers present at early stages of development may play a role in regulating specific events in cerebellar maturation. In contrast, the serotoninergic axons which have a more restricted pattern of distribution later in development, and in the adult, likely modulate neuronal activity within the cerebellum.

Immunohistochemical analysis of the development of somatostatin in the reeler neocortex

The development of somatostatin (SS) neurons and fibers has been examined in the dorsolateral cortex of the mouse mutant reeler. Immunohistochemistry was performed using antisera directed primarily against SS28 or SS28(1–12). In the normal mouse at postnatal day 5 (P5), somatostatin (SS) neurons are concentrated in the ventral half of the cortex, in the developing layers V and VI. In the reeler mutant, SS neurons are scattered throughout the radial extent of the cortex, being concentrated in the dorsal half of the cortex in the polymorphic and large pyramidal cell layers. By P20, when the adult pattern of SS neuron distribution is evident in the normal mouse cortex, the distribution of similar neurons in the reeler appears inverted: immunoreactive neurons are concentrated in the dorsal half of the cortex. Immunoreactive fiber distribution follows a developmental pattern similar to that observed for SS neurons. At P5, SS fibers are most dense in layer I and V–VI of the normal cortex, while in the reeler, fibers are predominant in the polymorphic and large pyramidal cell layers. By P10, many fewer immunoreactive fibers can be detected in either normal or reeler mice than at P5. Nevertheless, while SS fibers in the normal cortex are most dense in layers I and V–VI, the reeler cortex exhibits little laminar heterogeneity in the distribution of these fibers. Thus, the SS fiber distribution appears less organized in the reeler cortex. These results suggest that whatever the nature of the genetic alteration resulting in cortical cellular developmental malposition in the reeler, SS cells and fibers, representing a completey intrinsic neocortical cellular system, behave as do all other cortical elements.

Microhabitat preference and coexistence of ectoparasitic arthropods on Alaskan seabirds

The population structure and distribution patterns of ectoparasitic arthropods on four species of Alaskan seabirds (common murre (Uria aalge), thick-billed murre (Uria lomvia), black-legged kittiwake (Rissa tridactyla), and red-legged kittiwake (Rissa brevirostris)) were studied and interspecific interactions were examined. In most ectoparasite populations on murres and kittiwakes, females predominated. This pattern may be attributable to differences in activity, behavior, and mortality between the sexes of the ectoparasites. Except for feather mites, adults of most ectoparasites were less abundant than immatures. The extremely high relative abundance of immature ticks was probably due to the high fecundity of these organisms and predation pressure. Distribution patterns of adults differed significantly from those of immatures in most louse and tick populations. Populations of lice (Quadraceps obliquus (Mjöberg), Quadraceps ornatus (Grube)) and ticks (Ixodes uriae White) on murres and kittiwakes were highly clumped. The degree of clumping was lower among ectoparasites on murres than among those on kittiwakes. Murres aggregate more and thus provide more opportunities for their ectoparasites to disperse to new host individuals. Ticks were the dominant group of ectoparasites in most body regions. On the wings, however, mites were much more abundant. The wings provided the largest surface area and supported the highest ectoparasite species diversity and population density. The louse and tick populations exhibited distinct patterns of spatial distribution on the host, largely as a result of their distinct preferences for certain microhabitats. However, close competition appears to occur between Q. obliquus and I. uriae on murres, and between the two feather mites, Alloptes (Alloptes) sp. and Laronyssus martini (Trouessart), on kittiwakes.

Pathway formation and the terminal distribution pattern of the spinocerebellar projection in the chick embryo

Pathway formation and the terminal distribution pattern of spinocerebellar fibers in the chick embryo were examined by means of an anterograde labelling technique with wheat germ agglutinin conjugated horseradish peroxidase (WGA-HRP). Spinocerebellar fibers, which originate in the lumbar spinal cord and are located in the marginal layer of the spinal cord, reach the dorsal part of the cerebellar plate on embryonic day (E)8. On the way to the cerebellum the fibers form one distinct bundle, that suggests that gross projection errors probably do not occur during the formation of the spinocerebellar pathway. On E10, labelled fibers are located mostly in the medullary zone of the anterior lobe. By E12, the number of labelled fibers increases greatly in the inner granular and molecular layers. In transverse sections labelling was distributed throughout the mediolateral extent of the medullary zone. By E14, sagittal strips of labelling were clearly recognized in lobules II-IV; however, labelled terminals were present throughout lobule I. Although the adult pattern of terminal distribution is attained by E14, the mossy fiber terminals are still quite immature. The density of labelling decreased greatly by E16, and small terminal varicosities were first recognized. Structural differentiation of mossy fiber terminals continues to the end of the embryonic or the newly posthatched period.

Thyrotropin-releasing hormone (TRH): Immunohistochemical distribution in tadpole and frog brain

The anatomical localization of immunoreactive TRH (IR-TRH) was demonstrated by the peroxidase-antiperoxidase technique in the brain and pituitary gland of larval and adult Rana catesheiana. In the adult frog main sites of IR-TRH are perikarya and neuronal fibers in the preoptic and infundibular nuclei of the hypothalamus and in the amygdala and diagonal band of Broca of the telencephalon. In addition, TRH-positive neuronal fibers and endings were found in the septum, pallium, and brain stem as well as in the preoptico-hypophyseal tract, the external zone of the median eminence (which matures during late larval stages), and the pars nervosa; fibers were less extensive in the pars intermedia, and were absent from the pars distalis. In early larval stages, the magnocellular nucleus of the posterior preoptic area is the main site of immunoreactive perikarya. During late stages the extensive adult pattern of distribution of IR-TRH becomes established. The study represents the first immunohistochemical demonstration of IR-TRH in larval anurans, and serves as a basis for clarification of the neuroendocrine regulation of metamorphosis.

Adult populations of the sugi bark borer, Semanotus japonicus Lacordaire (Coleoptera: Cerambycidae), in Japanese cedar stands: Population parameters, dispersal, and spatial distribution

SummaryAdult populations of the sugi bark borer, Semanotus japonicusLacordaire, which attacks the trunks of Japanese cedar and cypress, were studied in two cedar stands in 1981 and 1984, using a band‐trapping method developed by the author.Adults began to emerge and fly earlier in 1981 than in 1984 because of the higher temperature after hibernation in 1981. Population size wasestimated by a markrelease‐recapture method. The daily survival rate ranged from 0.86 to 0.92 and the mean longevity from 7.0 to 11.9 days. Females were fewer than males throughout the season, especially early in the flight period, because males consistently emerged earlier. The mean distances traversed among the cedar trees were 9.2 m for males and 16.3 m for females; maximum dispersal was 79.5 m for males, 149.5 m for females. There are two different patterns in their dispersal movement: the small‐scale movement which consists of walking at cool temperatures and large‐scale flight at warm temperatures. Adults of this species are somewhat sluggish and between‐tree movement is infrequent. This lack of movement resulted in a contagious distribution pattern of adults.

Postnatal development of dopamine-β-hydroxylase-immunoreactive fibers of the spinal cord of the rat

The development of dopamine-beta-hydroxylase (DBH)-immunoreactive fibers of the rat spinal cord was studied in the cervical, thoracic and lumbar regions at birth, 6, 14, 30 and 90 days of age. The adult pattern of distribution of DBH-immunoreactive fibers is similar to that of catecholaminergic histofluorescence. Our results suggest that DBH immunoreactivity is more sensitive than glyoxylic acid methods in early development, since the immunocytochemical method demonstrates stained fibers at an earlier age than the histofluorescence method. At birth noradrenergic innervation was already established; DBH immunoreactivity was notable in the ventral horn of the lumbar region and in the zona intermedia (ZI); the new finding was that not only the intermediolateral cell column but also the dorsal autonomic nucleus and the transverse connections between them were distinctly stained and were periodically organized. With increasing age, the general rule is that the intensity of the staining increased simultaneously in all regions. In the gray matter, networks of stained fibers became more complex. In contrast to earlier workers, we found no evidence for 'selective destruction' of noradrenergic fibers within the ZI in the postnatal period. The exceptions to the rule are DBH-immunoreactive fibers in the ventral white matter; these fibers increased in number up to day 14 and appeared to decrease thereafter; they were most numerous in the cervical region and diminished in number caudally; these fibers were diffuse in the cervical region but as they coursed caudally they became concentrated in a more ventral marginal location.

Postnatal development of dopamine-β-hydroxylase-immunoreactive fibers of the spinal cord of the rat

The development of dopamine-β-hydroxylase (DBH)-immunoreactive fibers of the rat spinal cord was studied in the cervical, thoracic and lumbar regions at birth, 6, 14, 30 and 90 days of age. The adult pattern of distribution of DBH-immunoreactive fibers is similar to that of catecholaminergic histofluorescence. Our results suggest that DBH immunoreactivity is more sensitive than glyoxylic acid methods in early development, since the immunocytochemical method demonstrates stained fibers at an earlier age than the histofluorescence method. At birth noradrenergic innervation was already established; DBH immunoreactivity was notable in the ventral horn of the lumbar region and in the zona intermedia (ZI); the new finding was that not only the intermediolateral cell column but also the dorsal autonomic nucleus and the transverse connections between them were distinctly stained and were periodically organized. With increasing age, the general rule is that the intensity of the staining increased simultaneously in all regions. In the gray matter, networks of stained fibers became more complex. In contrast to earlier workers, we found no evidence for ‘selective destruction’ of noradrenergic fibers within the ZI in the postnatal period. The exceptions to the rule are DBH-immunoreactive fibers in the ventral white matter; these fibers increased in number up to day 14 and appeared to decrease thereafter; they were most numerous in the cervical region and diminished in number caudally; these fibers were diffuse in the cervical region but as they coursed caudally they became concentrated in a more ventral marginal location.

Autoradiographic study of β1-Adrenergic receptor development in the mouse forebrain

The development of β 1-adrenergic receptors has been studied in the mouse forebrain from embryonic day 14 (E14) to adulthood, using autoradiographic visualization of [ 125I]iodocyanopindolol (ICYP) binding sites. From E14, ICYP binding sites are detected in moderate amounts in the striatum and basal forebrain and in very low concentration in the cortical plate. At E17, binding sites have increased in number in the deep layers of the embryonic cortex and extend over the whole thickness of the cortical ribbon at birth. On postnatal day 4 (P4), ICYP binding sites are more abundant in the superficial than in the inner cortex. By P10 the adult pattern of ICYP binding site distribution is achieved, namely: a high concentration in ventral pallidum, striatum and cortical layers I, II and III, a moderate concentration in layers V and VI and a lower density in septal areas and in cortical layer IV. It is well established that norepinephrine fibers arrive in the embryonic cortex early in development 6,8,18,25. The present results show that the development of norepinephrine fiber and β 1 receptor systems are coincident in the mouse.

Development of cholinergic markers in mouse forebrain. II. Muscarinic receptor binding in cortex

The distribution of muscarinic receptor sites throughout the ontogeny of cerebral cortex in the BALB/c mouse have been labeled, placing special emphasis on binding site development in parietal neocortex and hippocampus. We describe a new procedure for the use of [ 3H]propylbenzilylcholine mustard as a muscarinic cholinergic ligand in an in vitro binding assay on brain sections. Muscarinic binding sites, as visualized by autoradiography, can be seen in cortex as early as embryonic day 18. They achieve maximal labeling density and adult distribution in neocortex by the end of the first postnatal month. The adult distribution pattern in hippocampus is reached by the second postnatal week, but the maximal density of label is not achieved until 4 weeks of age. Changes in the receptor binding pattern are illustrated at 5 different ages between birth and adulthood. We conclude that muscarinic cholinergic receptors develop late in cortical ontogeny as do other cholinergic markers. The distribution pattern of muscarinic binding sites in mouse cortex is puzzling because it does not correspond to the reported distribution of cells physiologically responsive to applied acetylcholine. These results are compared to the onset of choline acetyltransferase activity and acetylcholine esterase staining. The ontogenesis of the cortical cholingergic system is compared with other features of general cortical morphogenesis.

Postnatal ontogenesis of the dopaminergic innervation in the rat anterior cingulate cortex (area 24). Immunocytochemical and catecholamine fluorescence histochemical analysis.

The postnatal development of the dopaminergic input to the rat anterior cingulate cortex (area 24) was followed using anti-tyrosine hydroxylase immunocytochemistry and catecholamine fluorescence histochemistry in control and noradrenaline-depleted rats. Noradrenaline depletion in the cerebral cortex was obtained by peripheral injections of 6-hydroxydopamine (6-OHDA) at birth or N-2-chloroethyl-N-ethyl-2-bromobenzylamine (DSP4) at various postnatal ages and controlled by the absence of dopamine-beta-hydroxylase-labelled axons. The superficial and deep components of the anterior cingulate dopaminergic field developed at a different rate in control as well as lesioned rats. The deep supragenual dopaminergic field was already present at birth like the dopaminergic innervation of the prefrontal cortex area 32. In the superficial field, the molecular layer was reached first from postnatal day 3 (P3) on by positive axons running through the anterior hippocampal continuation and from P5-P6 on by another dopaminergic contingent coming through the deep dopaminergic field and giving off collaterals for layer III. The adult distribution pattern and striking varicose aspect were not reached until P21-P30 and a further increased density was observed until P60. The superficial cingulate dopaminergic field extended into the pregenual part of area 24b. The innervation of the superficial and deep layers of the rat anterior cingulate cortex by two distinct dopaminergic subpopulations, one of them closely related to that of prefrontal cortex area 32, could be compared with other laminar differences. The important functional implications of these data are further discussed.

The ontogenetic development of neurotensin-like immunoreactivity and neurotensin receptors in the cat striatum

At birth, striatal neurotensin-like immunoreactivity amounted to 10% of the adult values which were reached at the age of 5 weeks. In the caudate nucleus neurotensin-like immunoreactivity presented a patchy distribution throughout development that was in register with Met-enkephalin straining, whereas [ 3H]neurotensin binding sites were most heavily concentrated in the background matrix. Thus, the adult distribution pattern of neurotensin-like immunoreactivity and ] 3H]neurotensin binding sites is already established at birth.