• 대한수의학회지
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• 제37권4호
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• pp.793-807
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• 1997

We tried to develop detection system of porcine reproductive and respiratory syndrome virus(PRRSV) by in situ hybridization(ISH) in the piglets experimentally infected with KPRRS-2, the Korean isolate(12 piglets) or Mn-1b, the American isolate(4 piglets), and in the natural infection suspected 6 piglets. Twelve 30-days-old piglets(two pigs per each inoculated group) were inoculated by nasal instillation of KPRRS-2 virus(total dose $10^{4.5}TCID_{50}$), Six piglets(one pig per each group) were induced contact infection with inoculated piglets, during the experiment, and two piglets were used as control. Inoculated or contacted piglets were euthanized at 1, 3, 5, 7, 14 and 21 days postinoculation(DPI). The respiratory signs such as coughing and nasal discharge were observed on day 3 DPI, and ear cyanosis were on day 5 DPI, including contacted piglets. Through the necropsy, purple discolorization of dorsal part of lung, and hypertrophy of local lymph nodes were observed. The histopathological lesions of lung were interstitial pneumonia characterized by type 2 pneumocyte hyperplasia. We prepared the probe for ISH by RNA isolation from KPRRS-2, RT-PCR, and biotin labeling. We performed the ISH within only 1~2 hours using $Microprobe^{TM}$ capillary action system. As the results, the strong red specific positive signals, means PRRSV distribution, was mainly observed in the cytoplasm of alveolar macrophages. And also signals were detected in some type 2 pneumocytes and bronchiolar epithelium of lung, myocardium, liver, kidney, tonsil, spleen, gastrointestinal mucosa, testis and lymph nodes.

• 한국동물번식학회:학술대회논문집
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• 한국동물번식학회 2002년도 춘계학술발표대회 발표논문초록집
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• pp.97-97
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• 2002

Achieving of in vitro development for mammalian premature spermatogenic cells are very difficult. In-vitro culture of spermatogenic cells were then initiated in an effort to try to study in vivo spermatogenesis and to understand its molecular events. Recently, the morphogenetic changes of spermatocytes or spermatid by in-vitro culture system were achieved. (omitted)

• Asian-Australasian Journal of Animal Sciences
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• 제22권8호
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• pp.1091-1101
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• 2009

In an attempt to understand the biochemical mechanism for the synthesis of the anabolic steroid, 19-nortestosterone, produced by prepubertal boar testes and its physiological role, normalized complementary DNA (cDNA) from boar testes was generated. DNA sequencing of 2,016 randomly selected clones yielded 794,116 base pairs of high quality nucleotide sequence. Computer-assisted assembly of the nucleotide sequence of each clone resulted in 423 contigs and 403 singletons including several genes for steroidogenic enzymes and molecules related to steroid metabolism. Analysis of gene expression pattern by use of the presently-fabricated cDNA microarray identified a number of genes that were differentially expressed during the postnatal development period in boar testes. Two genes of unknown function were identified to be highly expressed in the testis of 2-weeks-old neonatal boar. In addition, the sequencing of open reading frames of these genes revealed their homology with human alpha hemoglobin and Homo sapiens hypothetical LOC643669, transcript variant 1. Moreover, the transcripts of these genes were also detected in porcine muscle and adipocytes, in addition to Leydig cells of pigs.

• 한국수정란이식학회지
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• 제29권3호
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• pp.221-228
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• 2014

Despite that porcine spermatogonial stem cells (pSSCs) have been regarded as a practical tool for preserving eternally genetic backgrounds derived from pigs with high performance in the economic traits or phenotypes of specific human diseases, there were no reports about precise definition of niche conditions promoting proliferation and maintenance of pSSCs. Accordingly, we tried to determine niche conditions supporting proliferation and maintenance of undifferentiated pSSCs for short-term. For these, undifferentiated pSSCs were progressively cultured in different composition of culture medium, seeding density of pSSCs, type of feeder cells and concentration of growth factors, and then total number of and alkaline phosphatase (AP) activity of pSSCs were investigated at post-6 day culture. As the results, the culture of $4{\times}10^5$ pSSCs on mitotically in activated $2{\times}10^5$ STO cells in the mouse embryonic stem cell culture medium (mESCCM) supplemented with 30 ng/ml glial cell line-derived neurotrophic factor (GDNF) was identified as the best niche condition supporting effectively the short-term maintenance of undifferentiated pSSCs. Moreover, the optimized short-term culture system will be a basis for developing long-term culture system of pSSCs in the following researches.

• 한국축산식품학회지
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• 제30권5호
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• pp.842-850
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• 2010

성호르몬은 근육의 발달(아나볼릭 효과)에 관여하는 것으로 잘 알려져 왔으며 인체의 치료제로 넓게 사용되고 있다. 돼지고기에는 주로 성선(정소와 난소)에서 생산되어 고기에 축적된 다양한 아나볼릭 효과를 나타내는 성호르몬이 많이 존재하는 것으로 알려져 있다. 따라서 본 연구는 돼지고기에 존재하는 아나볼릭 스테로이드를 추출하여 근육세포의 증식과 분화에 미치는 영향을 파악하고자 실시하였다. 본 연구에서 돼지의 각 조직으로부터 아나볼릭 스테로이드를 추출하는 3가지 방법(M1, M2, M3)을 개발하였다. 3가지 모든 추출방법에서 아나볼릭 스테로이드가 추출되었으며 특히 M3에서 조직 1g당 가장 많은 양을 획득할 수 있었다. M3를 이용하여 아나볼릭 스테로이드를 추출했을 때 돼지고기의 근육과 지방에서는 스테로이드 호르몬 양이 수컷에서 가장 높았고, 혈청에서는 nandrolone 과 testosterone의 양은 수컷에서 가장 높았으며, estrone와 $17{\beta}$-estradiol의 양은 비슷하였다. 근육세포 증식은 돼지 아나볼릭 스테로이드의 농도 의존적으로 촉진되었으며, M3에서 가장 빠르게 증식되었다. 근육세포의 분화는 추출된 아나볼릭 스테로이드 처리구가 대조구보다 더 효과적으로 분화가 잘 되는 것을 세포 모양과 유전자(AR, myoD, desmin, myogenin)를 통하여 확인할 수 있었다. 특히 M3에서 추출된 아나볼릭 스테로이드에서 myogenin과 AR 유전자가 유의적으로 높게 발현되었다(p<0.001). 전체적으로 돼지의 아나볼릭 스테로이드는 근육세포의 성장과 분화를 촉진하였다. 따라서 돼지고기에 있는 아나볼릭 스테로이드의 섭취를 통해 인체 근육의 성장과 발달에 긍정적 효과를 나타낼 수 있을 것으로 사료된다.