• Journal of Animal Science and Technology
• /
• 제64권6호
• /
• pp.1117-1131
• /
• 2022

Previous studies reported that Bifidobacterium animalis ssp. lactis HY8002 (HY8002) improved intestinal integrity and had immunomodulatory effects. Lactobacillus plantarum HY7717 (HY7717) was screened in vitro from among 21 other lactic acid bacteria (LAB) and demonstrated nitric oxide (NO) production. The aims of this study were to investigate the individual and combined ex vivo and in vivo effects of LAB strains HY8002 and HY7717 at immunostimulating mice that have been challenged with an immunosuppressant drug. The combination of HY8002 and HY7717 increased the secretion of cytokines such as interferon (IFN)-γ, interleukin (IL)-12, and tumor necrosis factor (TNF)-α in splenocytes. In a cyclophosphamide (CTX)-induced immunosuppression model, administration of the foregoing LAB combination improved the splenic and hematological indices, activated natural killer (NK) cells, and up-regulated plasma immunoglobulins and cytokines. Moreover, this combination treatment increased Toll-like receptor 2 (TLR2) expression. The ability of the combination treatment to upregulate IFN-γ and TNF-α in the splenocytes was inhibited by anti-TLR2 antibody. Hence, the immune responses stimulated by the combination of HY8002 and HY7717 are associated with TLR2 activation. The preceding findings suggest that the combination of the HY8002 and HY7717 LAB strains could prove to be a beneficial and efficacious immunostimulant probiotic supplement. The combination of the two probiotic strains will be applied on the dairy foods including yogurt and cheese.

• 공업화학
• /
• 제29권2호
• /
• pp.185-190
• /
• 2018

Bicyclo[2.2.1]hepta-2,5-diene (norbornadiene)의 이량체는 고에너지밀도 연료로 사용 가능하다. 본 연구의 목적은 Co 담지가 HY 제올라이트 촉매의 산특성에 미치는 영향과 norbornadiene의 이량화 반응에 미치는 영향을 고찰하는 것이다. HY 제올라이트 촉매에 코발트를 담지하면 산점의 양은 큰 변화가 없으나 산 세기는 약해졌다. 이는 $Br{\ddot{o}}nsted$산의 감소와 Lewis산의 증가에 기인한 것으로 볼 수 있다. HY 제올라이트와 Co/HY를 촉매로 사용하여 norbornadiene 이량화 반응을 수행한 결과, Co/HY 촉매는 HY 제올라이트 촉매보다 더 높은 norbornadiene 전환율과 norbornadiene 이량체수율을 나타내었다. Norbornadiene 이량화 반응에서 Co/HY 촉매의 활성이 HY 촉매보다 더 높은 것은 Lewis 산점의 역할이 더 크기 때문으로 해석할 수 있다. Co/HY 촉매를 이용하여 제조한 norbornadiene 이량체의 밀도와 발열량이 문헌에 알려진 값과 잘 일치하며, 본 연구에서 제조한 norbornadiene 이량체가 고에너지밀도 연료로서 사용 가능하다는 것을 확인하였다.

• Journal of Microbiology and Biotechnology
• /
• 제24권12호
• /
• pp.1736-1743
• /
• 2014

In this study, we evaluated the effect of Lactobacillus plantarum HY7714 on skin hydration in human dermal fibroblasts and in hairless mice. In Hs68 cells, L. plantarum HY7714 not only increased the serine palmitoyltransferase (SPT) mRNA level, but also decreased the ceramidase mRNA level. In order to confirm the hydrating effects of L. plantarum HY7714 in vivo, we orally administered vehicle or L. plantarum HY7714 at a dose of $1{\times}10^9CFU/day$ to hairless mice for 8 weeks. In hairless mice, L. plantarum HY7714 decreased UVB-induced epidermal thickness. In addition, we found that L. plantarum HY7714 administration suppressed the increase in transepidermal water loss and decrease in skin hydration, which reflects barrier function fluctuations following UV irradiation. In particular, L. plantarum HY7714 administration increased the ceramide level compared with that in the UVB group. In the experiment on SPT and ceramidase mRNA expressions, L. plantarum HY7714 administration improved the reduction in SPT mRNA levels and suppressed the increase in ceramidase mRNA levels caused by UVB in the hairless mice skins. Collectively, these results suggest that L. plantarum HY7714 can be a potential candidate for preserving skin hydration levels against UV irradiation.

• Journal of Microbiology and Biotechnology
• /
• 제24권11호
• /
• pp.1583-1591
• /
• 2014

Ultraviolet (UV) irradiation alters multiple molecular pathways in the skin, thereby inducing skin damage, including photoaging. In recent years, probiotics have gained interest due to their beneficial effects on skin health, such as inhibiting atopic dermatitis and improving skin immunity or inflammation. However, little is known about the effects of probiotics on UVB-induced photoaging. In this study, we evaluated the effect of Lactobacillus plantarum HY7714 against UVB-induced photoaging in human dermal fibroblasts and hairless mice. The results showed that L. plantarum HY7714 treatment effectively rescued UVB-reduced procollagen expression through the inhibition of UVB-induced matrix metalloproteinase (MMP)-1 expression in human dermal fibroblasts. Data from a western blot showed that L. plantarum HY7714 inhibited the phosphorylation of Jun N-terminal kinase, thereby suppressing the UVB-induced phosphorylation and expression of c-Jun. Oral administration of L. plantarum HY7714 clearly inhibited the number, depth, and area of wrinkles in hairless mouse skin. Histological data showed that L. plantarum HY7714 significantly inhibited UVB-induced epidermal thickness in mice. Western blot and zymography data also revealed that L. plantarum HY7714 effectively inhibited MMP-13 expression as well as MMP-2 and -9 activities in dermal tissue. Collectively, these results provide further insight regarding the skin biological actions of L. plantarum HY7714, a potential skin anti-photoaging agent.

• Journal of Ginseng Research
• /
• 제47권5호
• /
• pp.683-683
• /
• 2023

• 한국미생물·생명공학회지
• /
• 제51권1호
• /
• pp.53-58
• /
• 2023

Lactococcus lactis HY7803 균주를 대두 발효에 적용하여 맛 성분을 향상시키는 조미료 제조에 대한 이용 가능성을 확인하고자 대두 발효를 진행하였다. 대두발효물의 이화학적 분석 결과에 따르면, L. lactis HY7803 균주를 접종한 대두 발효물은 발효가 진행되면서 아미노태질소 함량, 아미노산 함량이 증가한 반면, 생균수가 감소하였다. 또한 맛성분에 기여하는 아미노산인 글루탐산의 함량을 보면, 발효가 진행됨에 따라 114.99 ± 9.37 pmol/ul에서 138.14 ± 1.76 pmol/ul로 함량이 증가하였고, 글루탐산을 포함한 12개의 아미노산 함량이 음성대조군인 균을 첨가하지 않은 대두발효물에 비해 높았고, Aspergillus oryzae SNU-G를 첨가한 대두발효물과 유사한 함량으로 측정되었다. 따라서 본 연구의 결과는 L. lactis HY7803가 A. oryzae SNU-G의 대체종균으로써 이용 가능하며, 대두 발효를 통해 감칠맛 성분을 생산하는데 기여하는 종균으로써 효과적일 것으로 판단하였다.

• 한국식품영양학회지
• /
• 제33권2호
• /
• pp.174-182
• /
• 2020

Probiotics improve the immune system. However, the effects of its lactic acid bacteria on atopic dermatitis relief and inflammation improvement is not fully understood. Recently, one of the probiotics, Lactobacillus helveticus HY7801 (HY7801), was found to have an anti-inflammatory effect. In this study, we investigated the effects of HY7801 on atopic dermatitis-induced animal models. After four weeks of oral administration, the group treated with HY7801 showed amelioration of the atopic dermatitis compared to the group receiving placebo. In the HY7801 treated group, the epidermal hyper-proliferation and collagen deposition were inhibited compared to the placebo group, and the secretion amount of the inflammatory factors, such as TNF-α, IL-4 were reduced. In conclusion, these results suggest that HY7801 acts as a functional probiotic via amelioration of the atopic dermatitis such as a decrease of epidermal hyper-proliferation, and collagen deposition and anti-inflammatory effects.

• 한국식품과학회지
• /
• 제36권4호
• /
• pp.604-608
• /
• 2004

Lactobacillus 균주들의 에탄올과 acetaldehyde의 대사 가능성을 시험관내 및 생체내에서 시험하였다. ADH와 ALDH 활성은 L. brevis 균주들이 다른 Lactobacillus 균주들과 비교하여 높게 나타났으며, 특히 L. brevis HY7401은 가장 높은 ADH와 ALDH 활성을 나타냈다. L. brevis HY7401$(10^9\;cfu/mL)$을 2주간 하루에 1 mL씩 쥐에게 급여한 후 시험 14일째에 에탄올(4g/kg BW)을 경구투여하고 혈중 에탄올 양을 측정한 결과, L. brevis HY7401 급여에 의해 혈중 에탄올 수준이 대조구에 비해 유의적으로 감소하는 것으로 나타났다. 에탄올 투여 6시간후의 혈중 에탄올 양이 각각 $1,195{\pm}92.9$(대조군) 그리고 $454{\pm}150mg/L$(HY7401군)으로 나타났다. 또한 L. brevis HY7401 급여한 군에서 소장내 에탄올 농도가 대조구와 비교하여 약 1/2수준이었으며, 초산 농도는 2배정도 높은 것으로 확인되었다. 따라서 이 연구결과들은 사람으로부터 분리된 L. brevis HY7401이 높은 ADH와 ALDH 활성을 갖고 있어 에탄올과 acetaldehyde를 대사한다는 것을 의미하고 있다. 또한 L. brevis HY7401을 쥐에게 급여함으로써 혈중 에탄올 수준을 낮출 수 있는 것으로 확인되었다.

• Journal of Microbiology and Biotechnology
• /
• 제23권3호
• /
• pp.414-421
• /
• 2013

Lactic acid bacteria (LAB) in fermented foods have attracted considerable attention recently as treatment options for immune diseases, the incidence of which has been increasing worldwide. The ability of 500 strains of LAB, isolated from kimchi, to induce TNF-${\alpha}$ production in peritoneal macrophages was investigated. Lactobacillus plantarum HY7712 most strongly induced TNF-${\alpha}$ production as well as NF-${\kappa}B$ activation. However, HY7712 inhibited NF-${\kappa}B$ activation in LPS-stimulated peritoneal macrophages. When HY7712 was orally treated in cyclophosphamide (CP)-immunosuppressed mice for 5 or 15 days, it reversed the body and spleen weights, blood RBC and WBC levels, and splenocyte and bone marrow cells that were reduced by CP. Orally administered HY7712 increased concanavalin A-induced T cell proliferation to 84.5% of the normal group on day 15, although treatment with CP alone markedly reduced it to 53.7% of the normal group. Furthermore, orally administered HY7712 significantly induced the expressions of IL-2 and IFN-${\gamma}$ in ConA-induced splenic cytotoxic T cells of CP-treated mice. Orally administered HY7712 restored the CP-impaired phagocytosis of macrophages in mice. Orally administered HY7712 also restored the cytotoxicity of NK and cytotoxic T cells derived from spleen and bone marrow against YAC-1 in CP-immunosuppressed mice. Based on these findings, orally administered HY7712 may accelerate the recovery of cyclophosphamide-caused immunosuppression, without evident side effects, by immunopotentiating NK and Tc cells, and may provide a mechanistic basis for using HY7712 as an alternative means in lessening chemotherapyinduced immunosuppression in cancer patients.

• 대한수의학회지
• /
• 제48권2호
• /
• pp.167-174
• /
• 2008

Lactic acid bacteria have been reported their beneficial roles on host including reduction of infectious diarrhea problems. In this study, preventive effect of Lactobacillus (L.) reuteri HY25101 and L. johnsonii HY25103 on porcine epidemic diarrhea virus (PEDV) was investigated in suckling piglets. Two groups of one day old PEDV naïve piglets were orally administered L. reuteri HY25101 and L. johnsonii HY25103 for three days respectively before challenge with lethal dose of PEDV. In second experiment, passive immunized one day old piglets using colostrums containing PEDV specific IgA were used. The survival rates of the L. reuteri HY25101 administered group were significantly higher than that of L. johnsonii HY25103 administered group and viral shedding was rapidly diminished in L. reuteri HY25101 administered group. Interestingly piglets born from the sow immunized with attenuated PEDV vaccine were not completely protected from PEDV challenge, however coadministeration of L. reuteri HY25101 and colostrums containing PEDV specific IgA were more effectively prevent PEDV infection. These results suggested that dietary treatment using L. reuteri HY25101 could reduce diarrheal problem and mortality rate caused by PEDV in suckling pigs. In addition, L. reuteri HY25101 could be used as one of effective compensation treatment with attenuated live vaccine for PED.