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Coexpression of Adrenomedullin and Its Receptors in Uteroimplantation Regions of Wistar Rats in Early Gestation Period

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Coexpression of Adrenomedullin and Its Receptors in Uteroimplantation Regions of Wistar Rats in Early Gestation Period K.R.Padma et al. / Journal of Pharmacy Research 2017,11(3),196-200 Research Article Available online through ISSN: 0974-6943 http://jprsolutions.info Coexpression of Adrenomedullin and Its receptors in Uteroimplantation regions of wistar rats in early gestation period K.R.Padma1 and Dr.P.Josthna* Department of Biotechnology ,Sri Padmavati Mahila Visvavidyalayam (Women’s University), Tirupati, 517 502 Andhra Pradesh, India. Received on:12-01-2017; Revised on: 14-02-2017; Accepted on: 17-03-2017 ABSTRACT Concentrations of adrenomedullin (ADM) in circulation increases during pregnancy. The pattern of ADM level and gene expression of ADM, its receptor components from early pregnancy has been studied in our present work. Calcitonin gene-related peptide (CGRP) and its related peptide, adrenomedullin (ADM), have vasorelaxant activity in a variety of tissues. The CGRP plays an important role in maintaining uterine relaxation during pregnancy. Calcitonin receptor-like receptor (CRLR), a seven-domain transmembrane protein functions as CGRP- á & â receptor in association with receptor activity modifying protein (RAMP1), whereas CRLR and RAMP2 or RAMP3 constitute a receptor for ADM. In our present study we examined the mRNA expression of ADM, CRLR, RAMP1, RAMP2 & RAMP3 by real-time PCR. The changes in mRNA are relative to the GAPDH marker. Administration of peptide receptor antagonist s.c on day 2 of gestation with the help of osmotic mini pump results in decrease in mRNA expression levels mainly in ADM & RAMP2 rather than CRLR and RAMP1&3.The dose response effect of ADM evinced well marked decrease in uterus and implantation weights when administered with 250µg/rat/day rather than control and low doses. Our results demonstrated that both CGRP and ADM along with receptor activity modifying protein (RAMP1) are essential to maintain implantation to full term baby. KEY WORDS: Adrenomedullin, RAMP, pregnancy, osmotic mini pumps CGRP. 1. INTRODUCTION: Previous studies revealed [1] that ADM (adrenomedullin) content of the calcitonin gene related peptide (CALCA) family and can bind to fetal membranes is augmented in both term and pre-term labour. We the CALCA receptor along with receptor activity modifying protein therefore inclined to determine whether ADM mRNA expression is (RAMP) complexes results in expression of specific receptors. altered in Uteroimplantation sites during early gestation. ADM mRNA According to previous reports [14,15], CGRP appeared to mediate its is strongly expressed in the reproductive system of rats and humans effects by two receptors, CGRP- and CGRP-. and its concentrations are altered in normal pregnancy[2]. The abundance of mRNA in pregnant rat uterus is double that in the non- It is well pioneered that the calcitonin receptor-like receptor (CALCRL) pregnant animal. Several reports have exposed that the plasma levels assets for the majority of ADM and CALCA binding, and whether it of ADM increase in normal human pregnancy at as early as 8 weeks binds to ADM or to CALCA depends on the type of receptor activity of gestation and are elevated as pregnancy progresses[3-5]. In addition, modifying protein [RAMP] that is expressed[16] notedly RAMP1, a previous study[6] has demonstrated that in maternal plasma, total RAMP2 and RAMP3.However, the expression of ADM was not ADM concentration increased progressively throughout pregnancy demonstrated in the uteroimplantation sites and there are no reports and decreased after delivery. of CALCRL or RAMP in the uteroimplantation regions, to our knowledge. Therefore, we studied the ADM level and the gene Adrenomedullin (ADM) is ubiquitous multiregulatory peptide expression of ADM, CALCRL, and RAMP and characterized the expressed and secreted by various organs and tissues, including the specific binding of ADM to RAMPs. We also studied the dose heart, kidney, lung, adrenal gland [7-8] and reproductive organs, such response effect of ADM in uterus and implantation weights. Our as the ovary[9-11], uterus, oviduct, testis, prostate and the epididymis. data suggested that RAMPs are necessary and sufficient to determine ADM shares structural homology with rat as it consists of 52 amino ligand specificity of CRLR. Thus ADM plays a crucial role in acids in the human and 50 amino acids in the rat[12,13]. As a member of maintaining healthy pregnancy. *Corresponding author. 2. MATERIALS AND METHODS: Dr. P. Josthna Assistant Professor 2.1. Animal maintenance: Department of Biotechnology Animal studies were performed as per institute animal ethics Sri Padmavati Mahila Visvavidyalayam (Women’s University) committee regulations and approved by the committee (Reg. No. Tirupati, 517 502 Andhra Pradesh, India. 1677/PO/a/12/CPCSEA/SPMVV-IEC/2014/01). Female Wistar rats with Journal of Pharmacy Research Vol.11 Issue 3 March 2017 196-200 K.R.Padma et al. / Journal of Pharmacy Research 2017,11(3),196-200 220-250 g weights were used for this study. Rats were placed in essential for all intracellular RNA isolation procedures. Complete plastic cages covered with wire mesh. Temperature was maintained disruption of cells walls and plasma membranes of cells and organelles at 37oC and a humidity of 55±5 % under a 12h light-dark cycle. is absolutely required to release all the RNA contained in the sample. Healthy female rats of Wistar strain were purchased from authorized vendor (M/S Raghavendra Enterprises, Bangalore, India). Incomplete disruption results in significantly reduced yields and after disruption homogenization is necessary to reduce the viscosity 2.2. Experimental Design: of the cell lysates produced by disruption. Homogenization shears Three to four pregnant rats were used for each of the experimental the high-molecular weight genomic DNA and other high-molecular- study. Female rats were mated with male proven breeders. The next weight cellular components to create a homogeneous lysate. day morning, collecting of vaginal secretion with a plastic pipette Incomplete homogenization results in significantly reduced yields. filled with 10 ìL of normal saline (NaCl 0.9%) by inserting the tip into Immediately place the weighed, fresh tissue in liquid nitrogen and the rat vagina. One drop of vaginal fluid was placed on glass slides then grind to a fine powder with mortar and pestle under liquid the unstained material was observed under a light microscope[17,18]. Two females of pro-estrous stage were paired with a male overnight nitrogen. Transfer tissue powder and liquid nitrogen into a liquid- and the next morning, males were removed and females were assessed nitrogen-cooled, 2-ml microfuge tube and allow the liquid nitrogen for the presence of sperms in the vaginal flush. Animals with positive to evaporate. Add the appropriate amount of Buffer RLT and sperm in the flushes are designated as day 1 of gestation. homogenize by passing the lysate at least 5 times. Alternatively, pipet lysate onto a QIAshredder column in a 2-ml collection tube 2.3. Treatments: and centrifuge for 2 min at maximum speed to homogenize. Centrifuge The mean ± SEM body weight was 224 ± 250 g in the rats on day 2 of lysate for 3 min at maximum speed in a microcentrifuge and use only gestation were taken. On day 2 of gestation, (model 2001) Alzet pump; 1.0 µl/h were inserted subcutaneously into the dorsum of pregnant the supernatant in subsequent steps. Add 1 volume (usually 350µl rats while the animals were under anaesthesia (anaesthesia consisted or 600 µl) of 70% ethanol to the cleared lysate, and mix well by of a combination of ketamine (45 mg/kg) and xylazine (5 mg/kg). The pipetting. Do not centrifuge. Apply 700 µl of the sample, including minipumps were filled with saline alone or with saline containing any precipitate which may have formed, to an RNeasy mini spin different concentrations of AM22–52. These concentrations were column in a 2-ml collection tube. Centrifuge for 15 sec at >10,000 [19] chosen based on the earlier findings of Witlin, et al. and rpm. Pipet 700 µl Buffer RW1 onto the RNeasy column, and centrifuge Penchalaneni, et al.[20] to deliver AM at 125 and 250µg/rat/day. 22–52 for 15 sec at >10,000 rpm to wash. Discard flow-through and collection tube. Pipet 500 µl Buffer RPE onto RNeasy column, and centrifuge 2.4. Dose response effect of Uteroimplantation region: An initial time course study was performed. Pumps were inserted on for 2 min at maximum speed to dry the RNeasy membrane. Place the Day 2 of gestation to continuously deliver ADM antagonist (100, RNeasy spin column in a new 2-ml collection tube and discard the 125 & 250 mg/rat/day) or vehicle control. The dose of ADM was old collection tube with the filtrate. Centrifuge at full speed for 1 min. chosen based on preliminary work with ADM, published experience Transfer RNeasy column into a new 1.5-ml collection tube and pipet with CGRP[14]. Following the time-course study, we modified the doses 30–50 µl of RNase-free water directly onto the RNeasy membrane. of ADM antagonist. The osmotic minipumps were inserted on Day 2 Centrifuge for 1 min at 10000 x g to elute. Repeat if the expected RNA of gestation; the rats were killed on gestational day5, 6, 7& 8. Based yield is >30 µg. on our initial time-course studies, we adjusted the dose of ADM antagonist to 100, 125 µg/rat/day, 250 µg/rat/day or vehicle control. 2.5.1.2. Reverse Transcription & Polymerase Chain Reaction (RT-PCR): In all cases, the drugs were placed in the mini pumps and the osmotic The first-strand cDNA was synthesized by reverse transcription (RT) mini pumps were inserted s.c. into the dorsum of the pregnant rats while animals were under anesthesia. We sacrificed the rats with for that in a 25-µl reaction volume containing, PCR buffer, 2µg of total RNA were mixed with 10 nmol of random primer, 1mM dNTP solution CO2.
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