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J Comp Neurol. 2002 Aug 12;450(1):34-44.
Immunohistochemical localization and biochemical characterization of ghrelin in the brain and stomach of the frog Rana esculenta.

Galas L, Chartrel N, Kojima M, Kangawa K, Vaudry H.

European Institute for Peptide Research (IFRMP 23), Laboratory of Cellular and Molecular Neuroendocrinology, INSERM U-413, UA CNRS, University of Rouen, 76821 Mont-Saint-Aignan, France.

Ghrelin is a 28-amino acid n-octanoylated peptide recently isolated from the rat stomach as an endogenous ligand of the growth hormone secretagogue receptor. So far, the occurrence of ghrelin has not been investigated in submammalian vertebrates. In the present work, we have studied the anatomic distribution and biochemical characterization of ghrelin-like immunoreactivity in the brain and stomach of the frog Rana esculenta by using two distinct antisera directed against rat ghrelin. In the brain, sparse ghrelin-positive cells were detected in three nuclei of the diencephalon, namely the suprachiasmatic nucleus and the posterior tuberculum in the hypothalamus, and the posterodorsal aspect of the lateral nucleus in the thalamus. A few ghrelin-immunoreactive neurons were also found in the mesencephalon, i.e., in the pretoral gray and the anterodorsal tegmental nucleus. Ghrelin-containing fibers were widely distributed in the frog brain. In particular, diffuse networks of immunoreactive processes were observed in various regions of the telencephalon, including the medial pallium, the striatum, the nucleus of the diagonal band of Broca, the nucleus accumbens, and the amygdala. In the diencephalon, the magnocellular nucleus, the suprachiasmatic nucleus, the posterior tuberculum, and the ventrolateral and lateral thalamic nuclei were moderately to densely innervated with ghrelin-containing fibers. A moderate density of positive fibers was also found in different areas of the mesencephalon such as the nucleus of the medial longitudinal fasciculus, the pretoral gray, and the tegmentum. In the stomach, a few brightly immunofluorescent cells were detected in the mucosa. The distribution pattern and morphologic characteristics of ghrelin-containing cells in the stomach suggest that they correspond to endocrine cells. Reversed-phase high performance liquid chromatography analysis of frog brain and stomach extracts, combined with RIA detection, revealed that ghrelin-immunoreactive material eluted as a single peak with a retention time slightly shorter than that of synthetic rat ghrelin. The present data provide the first evidence that a ghrelin-related peptide is present in submammalian vertebrates. The occurrence of ghrelin-containing cells in the hypothalamus and the stomach mucosa suggests that, in amphibians, ghrelin may exert both neuroendocrine and endocrine activities. 2002 Wiley-Liss, Inc.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=12124765&dopt=Abstract

J Comp Neurol. 2002 Aug 12;450(1):45-60.
Distribution of thyrotropin-releasing hormone (TRH) immunoreactivity in the brain of the zebrafish (Danio rerio).

Diaz ML, Becerra M, Manso MJ, Anadon R.

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

The distribution of thyrotropin-releasing hormone (TRH) in the brain of the adult zebrafish was studied with immunohistochemical techniques. In the telencephalon, abundant TRH-immunoreactive (TRHir) neurons were observed in the central, ventral, and supra- and postcommissural regions of the ventral telencephalic area. In the diencephalon, TRHir neurons were observed in the anterior parvocellular preoptic nucleus, the suprachiasmatic nucleus, the lateral hypothalamic nucleus, the rostral parts of the anterior tuberal nucleus and torus lateralis, and the posterior tuberal nucleus. Some TRHir neurons were also observed in the central posterior thalamic nucleus and in the habenula. The mesencephalon contained TRHir cells in the rostrodorsal tegmentum, the Edinger-Westphal nucleus, the torus semicircularis, and the nucleus of the lateral lemniscus. Further TRHir neurons were observed in the interpeduncular nucleus. In the rhombencephalon, TRHir cells were observed in the nucleus isthmi and the locus coeruleus, rostrally, and in the vagal lobe and vagal motor nucleus, caudally. In the forebrain, TRHir fibers were abundant in several regions, including the medial and caudodorsal parts of the dorsal telencephalic area, the ventral and commissural parts of the ventral telencephalic area, the preoptic area, the posterior tubercle, the anterior tuberal nucleus, and the posterior hypothalamic lobe. The dorsal thalamus exhibited moderate TRHir innervation. In the mesencephalon, the optic tectum received a rich TRHir innervation between the periventricular gray zone and the stratum griseum centrale. A conspicuous TRHir longitudinal tract traversed the tegmentum and extended to the rhombencephalon. The medial and lateral mesencephalic reticular areas and the interpeduncular nucleus were richly innervated by TRHir fibers. In the rhombencephalon, the secondary gustatory nucleus received abundant TRHir fibers. TRHir fibers moderately innervated the ventrolateral and ventromedial reticular area and richly innervated the vagal lobe and Cajal's commissural nucleus. Some TRHir fibers coursed in the lateral funiculus of the spinal cord. Some TRHir amacrine cells were observed in the retina. The wide distribution of TRHir neurons and fibers observed in the zebrafish brain suggests that TRH plays different roles. These results in the adult zebrafish reveal a number of differences with respect to the TRHir systems reported in other adult teleosts but were similar to those found during late developmental stages of trout (Diaz et al., 2001). 2002 Wiley-Liss, Inc.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=12124766&dopt=Abstract

J Cell Physiol. 2002 Sep;192(3):339-50.
Novel insulin/GIP co-producing cell lines provide unexpected insights into Gut K-cell function in vivo.

Ramshur EB, Rull TR, Wice BM.

Department of Internal Medicine, Division of Metabolism, Washington University School of Medicine, St. Louis, Missouri 63110, USA.

Enteroendocrine (EE) cells represent complex, rare, and diffusely-distributed intestinal epithelial cells making them difficult to study in vivo. A specific sub-population of EE cells called Gut K-cells produces and secretes glucose-dependent insulinotropic peptide (GIP), a hormone important for glucose homeostasis. The factors that regulate hormone production and secretion, as well as the timing of peptide release, are remarkably similar for K-cells and islet beta-cells suggesting engineering insulin production by K-cells is a potential gene therapeutic strategy to treat diabetes. K-cell lines could be used to study the feasibility of this potential therapy and to understand Gut K-cell physiology in general. Heterogeneous STC-1 cells were transfected with a plasmid (pGIP/Neo) encoding neomycin phosphotransferase, driven by the GIP promoter-only cells in which the GIP promoter was active survived genetic selection. Additional clones expressing pGIP/Neo plus a GIP promoter/insulin transgene were isolated-only doubly transfected cells produced preproinsulin mRNA. Bioactive insulin was stored and then released following stimulation with arginine, peptones, and bombesin-physiological GIP secretagogues. Like K-cells in vivo, the GIP/insulin-producing cells express the critical glucose sensing enzyme, glucokinase. However, glucose did not regulate insulin or GIP secretion or mRNA levels. Conversely, glyceraldehyde and methyl-pyruvate were secretagogues, indicating cells depolarized in response to changes in intracellular metabolite levels. Potassium channel opening drugs and sulphonylureas had little effect on insulin secretion by K-cells. The K-cell lines also express relatively low levels of Kir 6.1, Kir 6.2, SUR1, and SUR2 suggesting secretion is independent of K(ATP) channels. These results provided unexpected insights into K-cell physiology and our experimental strategy could be easily modified to isolate/characterize additional EE cell populations. 2002 Wiley-Liss, Inc.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=12124779&dopt=Abstract

Int J Cancer. 2002 Aug 10;100(5):507-14.
Characterization of androgen receptor and nuclear receptor co-regulator expression in human breast cancer cell lines exhibiting differential regulation of kallikreins 2 and 3.

Magklara A, Brown TJ, Diamandis EP.

Department of Pathology and Laboratory Medicine, Mount Sinai Hospital, Toronto, Ontario, Canada.

Accumulating evidence indicates that androgens and the androgen receptor modulate the development and progression of breast adenocarcinoma; however, the precise role and actions remain poorly defined. We examined previously the steroid hormone regulation of 2 known androgen-regulated kallikreins, KLK3 (encoding PSA) and KLK2 (encoding human kallikrein 2 or hK2) in BT-474, T-47D, ZR75-1, MCF-7, MFM-223 and BT-20 human breast cancer cells and found that they were differentially regulated, with the cells showing variable responses to androgen. To determine if this variable response was reflected by differences in androgen receptor, we characterized the expression of androgen receptor in these cells by Western blot analysis and saturation binding analysis. In addition, we sequenced androgen receptor cDNA from each of these cell lines to check whether any androgen receptor mutations were present. The expression of 11 nuclear receptor co-regulatory factors (SRC-1, AIB1, ARA24, ARA54, ARA55, ARA70, ARA160, FHL2, PDEF, NCoR1, SMRT) was compared in these cell lines by semi-quantitative RT-PCR to determine if the pattern of receptor co-activators or -repressors expressed in these cells might explain the differential regulation of KLK2 and KLK3. The levels of androgen receptor varied among the cell lines, but did not correlate with hK2 and PSA secretion determined previously. No mutations within the coding regions of the receptor were detected. With the exception of receptor expressed by MCF-7 cells, the polymorphic CAG repeat length was in the normal range. Every breast cancer cell line exhibited a distinct expression pattern of the nuclear receptor co-regulators examined raising the possibility that the relative levels of these co-activators/-repressors might differentially modulate androgen receptor transcriptional activity within the promoter/enhancer region of KLK2 and KLK3 of these cells. 2002 Wiley-Liss, Inc.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=12124798&dopt=Abstract

Mol Reprod Dev. 2003 Feb;64(2):219-25.
Optimization of superovulation induction by human menopausal gonadotropin in guinea pigs based on follicular waves and FSH-receptor homologies.

Suzuki O, Koura M, Noguchi Y, Takano K, Yamamoto Y, Matsuda J.

Department of Veterinary Science, National Institute of Infectious Diseases, Tokyo, Japan. osuzukih.go.jp

The guinea pig represents an excellent animal model for the study of reproduction in humans and most domestic animals because unlike the mouse and rat, it undergoes a complete estrous cycle. In this study, we investigated the availability of ovarian oocytes during the estrous cycle, and the follicle stimulating hormone (FSH) receptor (FSH-R) homologies between guinea pigs and other species, in order to identify an effective gonadotropin and optimal time-of-application for the induction of superovulation in the guinea pig. The number of collectable ovarian oocytes showed biphasic changes with peaks at the midluteal and pre-ovulatory stages. On the other hand, the number of oocytes that matured in vitro remained constant ( approximately 10 oocytes) until day 14 post-ovulation and increased thereafter. The deduced amino acid sequence of the guinea pig FSH-R showed greater similarity to the primate FSH-R than to the rodent FSH-R, which suggests that commercially available human menopausal gonadotropin (hMG) may be a better inducer of superovulation in guinea pigs. Indeed, significantly more oocytes (5.4 +/- 1.6, range 0-17, n = 10) were obtained from hMG-treated guinea pigs at the pre-ovulatory stage than during spontaneous ovulation (3.6 +/- 0.1, n = 96; P < 0.05), whereas guinea pigs that received hMG at the midluteal stage (n = 3) did not ovulate. These results indicate that hMG is an effective, albeit stage-dependent, inducer of superovulation in the guinea pig, and that FSH-R homologies should be taken into account when choosing hormones for superovulation. 2003 Wiley-Liss, Inc.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=12506355&dopt=Abstract

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