Periodontal treatment of furcation involvement at the mandibular first molar with a follow-up of 27 years / 华西口腔医学杂志

Due to the complicated anatomical structures in the furcation area of multirooted mandibular first molars, dental hygiene is greatly compromised once the furcation is involved in the periodontitis, leading to the unfavorable prognosis of teeth with furcation involvement. A patient came to a dental office with the chief complaint of "mobile mandibular posterior tooth" 27 years ago. The periapical film showed alveolar bone resorption at the root furcation of the right mandibular first molar. Flap surgery and fine supportive therapy were conducted. The patient was diagnosed with "furcation involvement Class Ⅲ" during a revisit three years ago. Satisfactory and healthy periodontal statuses were observed 2, 9, 24, and 33 months after the periodontal flap surgery plus tunneling procedures. A follow-up of 27 years in the present case demonstrated that a favorable prognosis of furcation involvement can be achieved after adequate periodontal treatment.

Effect of Porphyromonas gingivalis lipopolysaccharide on innate immune responses in bone-marrow derived macrophages and osteoclasts / 中华口腔医学杂志

Objective@#To analyze the immune responses of bone-marrow derived macrophages and osteoclasts to lipopolysaccharide from Porphyromonas gingivalis (Pg-LPS) so as to provide reference for host immunomodulatory therapy of periodontitis.@*Methods@#Bone marrow mononuclear cells from C57BL/6 mice were obtained and induced into bone marrow macrophages (BMM) and osteoclasts (OC) by conditioned medium. The BMMs and OCs were divided into blank control group and Pg-LPS treated experimental group. Pg-LPS (10 μg/ml) was used to stimulate BMM and OC. The mRNA and protein expression of TLR-2 and TLR-4 and secretion of inflammatory cytokines were detected, respectively. Furthermore, the effect of Pg-LPS on the differentiation of BMM into OC was evaluated.@*Results@#Mouse bone marrow mononuclear cells were successfully induced into BMM and mature OC. In the presence of Pg-LPS, the gene level of TLR-2 in BMM was significantly up-regulated by (41.41±13.07) folds (P<0.01), while the level of TLR-4 mRNA was not significantly changed. TLR-2 mRNA and TLR-4 mRNA levels in OC increased by (2.24±0.23) times (P<0.05) and (4.83±1.07) times (P<0.01), respectively. Flow cytometry results showed that TLR-2 protein expression in BMM was robustly enhanced (P<0.01), as mean fluorescence intensities (MFI) were (39.85±5.27) in blank group and (221.57±13.13) in experimental group, respectively. The MFI of TLR-2 in OC also increased as (83.31±2.69) in blank group and (108.65±6.32) in experimental group, respectively (P<0.01). However, no significant TLR-4 expressions were observed in both BMM and OC (P>0.05). Moreover, the productions of tumor necrosis factor-α and interleukin-6 in response to LPS in BMM and OC remarkably increased (P<0.01). Lower cytokine expression was observed in OC than that in BMM (P<0.01). In addition, Pg-LPS obviously inhibited the number and size of OC formation, with a reduction in area percentage of approximately 47%.@*Conclusions@#Pg-LPS generated a robust immune inflammatory response to BMM, while OC had a relatively weaker immune response to the Pg-LPS. Pg-LPS might inhibite the differentiation of BMM into OC.

Advances in miRNA regulation of Th17/Treg balance / 医学研究生学报

T helper 17 (Th17) and regulatory T cells (Tregs) are two distinct subsets of T cells that play a key role in the development of autoimmunity and inflammation. Th17 cells are thought to be the key effector T cells that induce inflammatory responses while Tregs inhibit the development of inflammation by regulating effector T cell activity to maintain peripheral immune tolerance. Th17/Treg imbalance can lead to the development of autoimmune diseases. MicroRNAs (miRNAs) are small endogenous non-coding RNA molecules in eukaryotes that play important regulatory roles in the maintenance of homeostasis in the immune system and the development of autoimmune diseases. Abnormal expression of miRNA will result in a broken or dysfunctional balance of differentiation between Th cell subsets, leading to inflammation or autoimmune diseases. This article provides an overview of the research advances in miRNA regulation of Th17/Treg balance to explore the role and clinical significance of miRNAs in Th17/Treg balance and maintenance of immune system balance.

Advances in miRNA regulation of Th17/Treg balance / 医学研究生学报

T helper 17 (Th17) and regulatory T cells (Tregs) are two distinct subsets of T cells that play a key role in the development of autoimmunity and inflammation. Th17 cells are thought to be the key effector T cells that induce inflammatory responses while Tregs inhibit the development of inflammation by regulating effector T cell activity to maintain peripheral immune tolerance. Th17/Treg imbalance can lead to the development of autoimmune diseases. MicroRNAs (miRNAs) are small endogenous non-coding RNA molecules in eukaryotes that play important regulatory roles in the maintenance of homeostasis in the immune system and the development of autoimmune diseases. Abnormal expression of miRNA will result in a broken or dysfunctional balance of differentiation between Th cell subsets, leading to inflammation or autoimmune diseases. This article provides an overview of the research advances in miRNA regulation of Th17/Treg balance to explore the role and clinical significance of miRNAs in Th17/Treg balance and maintenance of immune system balance.

Efficacy of periodontal endoscope-assisted non-surgical treatment for severe and generalized periodontitis / 华西口腔医学杂志

OBJECTIVE@#To evaluate the effectiveness of periodontal endoscope as an adjuvant therapy for the non-surgical periodontal treatment of patients with severe and generalized periodontitis.@*METHODS@#Patients (n=13) were divided into three groups: patients treated with conventional subgingival scaling and root planing (SRP) (n=7, 408 sites) (group A), SRP using periodontal endoscope (n=4, 188 sites) (group B) or SRP with periodontal endoscope 3 months after initial SRP (n=2, 142 sites) (group C). Two subgroups were divided into 2 subgroups according to PD at the baseline: 46 mm as subgroup 2. Probing depth (PD), attachment loss (AL), gingival recession (GR) and bleeding on probing (BOP) were recorded.@*RESULTS@#The results of 3 months after treatment showed all PD, AL, and GR values in group A1 were less than those in group B1 (P6 mm, the application of periodontal endoscopy can increase the effect, reducing PD and GR, which may be an effective supplement to the current non-surgical periodontal treatment.

Expression of triggering receptors expressed on myeloid-1 in innate response to Porphyromonas gingivalis in macrophages / 中华口腔医学杂志

<p><b>OBJECTIVE</b>To investigate the role of triggering receptors expressed on myeloid-1(TREM-1) in innate response to Porphyromonas gingivalis(Pg) in mice macrophages and its potential role in periodontitis development.</p><p><b>METHODS</b>Peritoneal macrophages from mice were harvested, separated and cultured, then challenged with viable Pg. Transcription and protein expression in macrophages were assessed with real time PCR and flow cytometry respectively.LP-17 peptide (10, 100 and 1000 µg/L) was utilized to block TREM-1, and tumor necrosis factor-α (TNF-α) and interleukin-6 (IL-6) were detected by enzyme linked absorbent analysis.</p><p><b>RESULTS</b>At 2 h after Pg challenge, transcription of TREM-1 was significantly up-regulated after Pg challenge[(7.99 ± 1.11) fold vs blank]. At 24 h after bacteria infection, increased TREM-1 expression was demonstrated by flow cytometry, with mean fluorescent intensity increasing from (7.05 ± 1.85) in blank group to (13.17 ± 2.33) in experimental group. Proinflammatory cytokine (TNF-α and IL-6) production was significantly decreased after blocking TREM-1 by LP-17 peptide(100 and 1000 µg/L).</p><p><b>CONCLUSIONS</b>TREM-1 enhanced innate immune response to Pg in macrophages, which may facilitate periodontitis development.</p>

Effects of Porphyromonas gingivalis lipopolysaccharide on apoptotic genes in foam cells / 中华口腔医学杂志

<p><b>OBJECTIVE</b>To investigate the effects of Porphyromonas gingivalis lipopolysaccharide (Pg-LPS) on apoptotic genes in foam cells.</p><p><b>METHODS</b>Macrophages from THP-1 monocytes and foam cells from macrophages by oxLDL inducement were treated with oxidized low density lipoprotein (oxLDL) or oxLDL+ Pg-LPS. Cell apoptosis was detected by acridine orange-ethidium bromide (AO-EB) staining. Eleven atherosclerotic related apoptotic genes were examined with polymerase chain reaction (PCR) array, and apoptotic gene p53, c-Myc and caspase-3 were evaluated with real-time PCR.</p><p><b>RESULTS</b>Pg-LPS enhanced cell apoptosis rate during and after foam cells formation [(5.47+/-0.93)% vs. (7.50+/-0.54)%]. PCR array demonstrated that it increased B-cell CLL-lymphoma 2 (BCL2) related protein A1 (BCL2A1) transcription during foam cells formation (>2 fold), and promoted BCL2 and BCL2A1 transcription after foam cells formation (>2 fold). It promoted p53 and caspase-3 transcription level (4.50x10(-3)+/-4.02x10(-4) vs. 5.30x10(-2)+/-4.58x10(-3)), whereas inhibited c-Myc transcription level (1.53x10(-2)+/-5.77x10(-4)) during foam cells formation. It promoted caspase-3 transcription (6.00x10(-2)+/-6.08x10(-3)), and inhibited p53 transcription (4.23x10(-3)+/-5.85x10(-4)) after foam cells formation.</p><p><b>CONCLUSIONS</b>Pg-LPS affected apoptotic gene transcription during and after foam cells formation and enhanced cell apoptosis.</p>

Effect of cryopreservation of bone marrow stromal cells on periodontal tissue regeneration / 中华口腔医学杂志

<p><b>OBJECTIVE</b>To investigate the influence of cryopreservation on bone marrow stromal cells' (BMSC) capability of enhancing periodontal regeneration.</p><p><b>METHODS</b>Twenty-six artificial periodontal defects were established in 5 Beagle dogs and divided into 3 groups at random. Only collagen membrane, the complex of cryopreserved and un-cryopreserved BMSC and collagen scaffold were transplanted in the blank control group, cryopreserved and un-cryopreserved groups respectively. The periodontal regeneration was observed 8 weeks after transplantation.</p><p><b>RESULTS</b>The percentage of periodontal regeneration in cryopreserved and un-cryopreserved groups was significantly greater than that of the blank control group (P < 0.05), but no statistical difference was found between cryopreserved and un-cryopreserved groups.</p><p><b>CONCLUSIONS</b>Cryopreservation had no significant negative effects on BMSC capability of enhancing periodontal regeneration.</p>