RESULTS(2)RT-PCR

A 270-base pair (bp) cDNA product was amplified by RT-PCR. The PCR products from 8 animals (3 preluteolytic and 5 postluteolytic) are shown in Figure 1a. The identity of the band was confirmed by DNA sequencing and was 100% homologous with the expected cDNA sequence described by Wempe et al.. The intensity of the amplified cDNA product, measured after ethidium bromide staining of agarose gels, was significantly greater (p < 0.05) in luteal tissue from animals that had already undergone functional luteolysis (n = 5) compared to the other animals in the group (n = 9) that still had a functional CL (Fig. 2). There was no difference in the intensity of the amplified band obtained with the ATPase oligomers in CL collected before and after the onset of structural luteolysis (Fig. 1b). ampicillin antibiotic

In Situ Hybridization

In situ hybridization was performed on luteal tissue from a subset of animals before (n = 3) and after (n = 3) the onset of functional luteolysis. Representative in situ results for both groups of animals are presented in Figure 3. The intensity of the signal (the number of graphic pixels containing a silver grain) was significantly greater (p < 0.05) in CL from cows after functional luteolysis compared to CL collected before luteolysis (Table 1).

Table 1. MCP-1 mRNA expression (mean ± SEM) in the bovine CL measured by in situ hybridization.a

Cow Day of cycle Progesterone(ng/ml) PGFM(pg/ml) mRNA expression13
983c 19 3.6 114 0.31 ± 0.04
958c 17 4.3 81 0.32 ± 0.09
959c 19 2.7 198 .90.±

.2

2

982d 19 0.7 232 9.9 ± 2.6
984d 20 0.7 117 16.5 ± 3.7
955d 19 0.9 112 18.6 ± 4.6

a Systemic progesterone (ng/ml) and PGFM concentrations (pg/ml) were measured at the time of tissue collection. b Percentage pixels occupied by silver grains. c Preluteolytic corpus luteum. d Postluteolytic corpus luteum.

Category: Corpus Luteum / Tags: Luteolysis, Monocyte Chemoattractant, Protein