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J Exp Zool. 2002 Nov 1;293(6):594-600.
Changes in sex steroid levels in yolks of the leghorn chicken, Gallus domesticus, during embryonic development.

Elf PK, Fivizzani AJ.

Center for Learning Foundations, University of Minnesota Crookston, Crookston, Minnesota 56716, USA. pelail.crk.umn.edu

Yolk steroid hormones have been documented to have growth and behavior effects on hatchlings in several avian species. The purpose of these investigations was to determine initial levels of androstenedione (A), dihydrotestosterone (DHT), estradiol (E(2)), and testosterone (T), and document any changes in those hormones during the course of embryonic development in the Leghorn chicken, Gallus domesticus. Eggs were collected, labeled for hen of origin and egg sequence, incubated at 37.8 degrees C, and sacrificed at predetermined times during development. The embryos were staged, the yolk material collected, homogenized and hormones extracted. A, DHT, E(2), and T were separated via column chromatography and hormone levels determined using radioimmunoassays (RIAs). Results indicate a significant decrease in A and T during embryonic development, similar to that reported by our laboratory for the alligator, with A levels being significantly greater initially than levels of all other hormones. Changes in DHT mirrored changes in T levels. Chicken E(2) yolk content dynamics differ from those we have measured in both the turtle and the alligator. After an initial decline, E(2) in the yolks of chicken eggs undergoes a significant increase at the end of development, between embryonic stages 40 and 45 (days 14 and 20 of development). As the increase is much larger than could be accounted for by hormones present in the yolk material, this may represent early embryonic production of steroid hormones by the developing gonads. 2002 Wiley-Liss, Inc.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=12410608&dopt=Abstract

J Exp Zool. 2002 Nov 1;293(6):606-16.
Effect on growth and reproduction of hormone immersed and masculinized fighting fish Betta splendens.

Kirankumar S, Pandian TJ.

School of Biological Sciences, Madurai Kamaraj University, Madurai - 625 021, Tamil Nadu, India.

To produce all-male progenies in the fighting fish, Betta splendens, six groups of fry were subjected to discrete immersion treatment at different 17alpha-methyltestosterone (MT) doses (viz. 100, 200, 500, 700, 900, and 1,000 microg/l) for a constant duration (3 hr/day) and frequency (second, fifth, and eighth day after hatching). The treatment at 900 microg/l led to 98% masculinization and 71% survival at sexual maturity. Treated groups, which showed significant deviation from the 1:1 sex ratio, were classified into two different series: S1 and S2. The groups that showed nearly cent-percent masculinization were classified as S1, and the other groups were classified as S2. The S1 males showed remarkably slower growth and attained 3.5 cm total length compared to 6.0 cm attained by a normal male. The S2 males attained 5.4 cm total length. Apart from these morphological defects, both S1 and S2 males suffered functional (decreased sperm count and sperm motility) and behavioral defects (incomplete embracing during mating) in their reproductive ability, leading to approximately 50% and 30% reduction in fecundity per mating, respectively. The cumulative fecundity loss suffered by the S1 male during its active reproductive phase is discussed. When normal and sex-reversed males were presented, a female preferred the former. Progeny testing of the sex-reversed males showed the occurrence of 12.75% males, indicating the possible role of autosomal genes in the sex determination mechanism of this species. Discrete immersion treatment at optimal/super-optimal doses ensured not only a higher percentage of masculinization, but also a higher frequency of homogametic males (XX). 2002 Wiley-Liss, Inc.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=12410610&dopt=Abstract

J Comp Neurol. 2002 Dec 2;454(1):34-41.
Patterns of dye coupling in lumbar motor nuclei of the rat.

Coleman AM, Sengelaub DR.

Department of Psychology, Indiana University, Bloomington, Indiana 47405, USA.

Gap junctions exist on motoneurons of the spinal nucleus of the bulbocavernosus (SNB) and the dorsolateral nucleus (DLN), both sexually dimorphic motor nuclei in the lumbar spinal cord of the rat. In addition, messenger RNA for gap junction proteins is expressed in motoneurons of the retrodorsolateral nucleus (RDLN), a nondimorphic spinal motor nucleus that innervates a muscle of the foot. Gap junctions on SNB and DLN motoneurons are androgen sensitive; the number and size of gap junctions decrease following castration, a change that can be reversed with exogenous testosterone replacement. In contrast, RDLN gap junction mRNA levels remain constant throughout hormone manipulation. In this study, dye coupling was used to examine patterns of gap junction-mediated connectivity in these three lumbar spinal motor nuclei. Injection of dye into single motoneurons resulted in spatially extensive labeling of neighboring cells in all three nuclei; significantly more coupling was observed in the sexually dimorphic nuclei than in the RDLN. Dye-coupled clusters of cells included motoneurons and interneurons; coupling was bilateral in the SNB. Treatment with oleamide, a gap junction blocker, completely attenuated labeling. In all nuclei, androgen manipulation did not alter the number, identity, or distribution of coupled cells. Thus, sexually dimorphic nuclei in the spinal cord exhibit greater dye coupling than do nondimorphic populations, and the patterns of connectivity are insensitive to androgen despite modification of their number and size. 2002 Wiley-Liss, Inc.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=12410616&dopt=Abstract

J Comp Neurol. 2002 Dec 2;454(1):65-81.
Distribution of thyrotropin-releasing hormone immunoreactivity in the brain of the dogfish Scyliorhinus canicula.

Teijido O, Manso MJ, Anadon R.

Department of Cell and Molecular Biology, Faculty of Sciences, University of A Coruna, 15071-A Coruna, Spain.

To improve knowledge of the peptidergic systems of elasmobranch brains, the distribution of thyrotropin-releasing hormone-immunoreactive (TRHir) neurons and fibers was studied in the brain of the small-spotted dogfish (Scyliorhinus canicula L.). In the olfactory bulbs, small granule neurons richly innervated the olfactory glomeruli. In the telencephalic hemispheres, small TRHir neurons were observed in the superficial dorsal pallium, whereas TRHir fibers were widely distributed in pallial and subpallial regions. In the preoptic region, TRHir neurons formed a caudal ventrolateral group in the preoptic nucleus. In the hypothalamus, the most conspicuous TRHir populations were associated with the lateral hypothalamic recess, but small TRHir populations were found in the posterior tubercle and ventral wall of the posterior recess. The preoptic region and hypothalamus exhibited rich innervation by TRHir fibers. TRHir fibers were observed coursing to the neurohypophysis and the neuroepithelium of the saccus vasculosus, but not to the neurohemal region of the median eminence. Some stellate-like TRHir cells were observed in a few cell cords of the neurointermediate lobe of the hypophysis. The thalamus, pretectum, and midbrain lacked TRHir neurons. Further TRHir neuronal populations were observed in the central gray and superior raphe nucleus of the isthmus, and a few TRHir cells were located in the nucleus of the trigeminal descending tract at the level of the rostral spinal cord. In the brainstem, the central gray, interpeduncular nucleus, secondary visceral region of the isthmus, rhombencephalic raphe, inferior olive, vagal lobe, and Cajal's commissural nucleus were all richly TRHir-innervated. Comparison of the distribution of TRHir neurons observed in the dogfish brain with that observed in teleosts and tetrapods reveals strong resemblance but also interesting differences, indicating the presence of both a conserved basic vertebrate pattern and a number of derived characters. 2002 Wiley-Liss, Inc.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=12410619&dopt=Abstract

BJU Int. 2002 Nov;90(7):736-41.
Progesterone: a novel adjunct to intravesical chemotherapy.

Lewin J, Cooper A, Birch B.

MDR Research Group, Department of Urology, Southampton University Hospital, Southampton, UK. mlewin.fslife.co.uk

OBJECTIVE: To investigate the effect of progesterone on multidrug-resistant urothelial cell lines, as the failure of intravesical chemotherapeutic drugs is often caused by multidrug resistance (MDR), mediated by the drug efflux pump P-glycoprotein (PGP), the function of which can be down-regulated by various compounds including steroid hormones. MATERIALS AND METHODS: Two urothelial cell lines (RT112S and MGH-U1S) and their MDR sublines (RT112R, to cisplatin; and MGH-U1R, a cell line expressing PGP) were used to assess the cytotoxic effects of progesterone, epirubicin and their combination. Cytotoxicity was assessed using a tetrazolium-based assay and in situ confocal microscopy. RESULTS: Cell lines sensitive to epirubicin (MGH-U1S, RT112S and RT112R) required a much lower dose of epirubicin to kill half the cells than did the MDR cell line. Progesterone was intrinsically cytotoxic to all cell lines with little difference among them. Combined therapy had no cumulative effect on epirubicin-sensitive cell lines, but reversed MDR in the MGHU1R cell line, both assessed by confocal microscopy and by the tetrazolium assay. CONCLUSIONS: Progesterone can reverse MDR in urothelial cells in vitro. This, combined with its effects on cell differentiation and apoptosis, together with its safety and tolerability compared to other MDR agents, suggests it may be a valuable adjunct to intravesical chemotherapy.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=12410758&dopt=Abstract

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