and are proteolytic periodontopathogens that co-localize in polymicrobial subgingival plaque biofilms, display growth symbiosis and synergistic virulence in animal models of disease. These symbioses are underpinned by a range of metabolic interactions including cooperative hydrolysis of glycine-containing peptides to produce free glycine, which uses as a major energy and carbon source. To characterize the gene products essential for these interactions. MethodsThe transcriptome exposed to cell-free conditioned medium was determined using RNA-seq. proteases potentially involved in hydrolysis of glycine-containing peptides were identified using a bioinformatics approach. One hundred and thirty-twogenes displayed differential expression, with the pattern of gene expression consistent with succinate cross-feeding from to and metabolic shifts in the folate-mediated one carbon superpathway. Interestingly, no proteases were significantly up-regulated. Three proteases were identified as candidates and inactivated to determine their role in the release of free glycine. PG0753 and PG1788 but not PG1605 are involved in the hydrolysis of glycine-containing peptides, making free glycine available for utilization. Collectively these metabolic interactions help to partition resources and engage synergistic interactions between these two species. Collectively these metabolic interactions help to partition resources and engage synergistic interactions between these two species. Oral mycobiome profiling is important to understand host-pathogen interactions that occur in various diseases. Invasive fungal infections are particularly relevant for patients who have received chemotherapy and for those who have HIV infection. In addition, changes in fungal microbiota are associated with the worsening of chronic conditions like atopic dermatitis (AD). This work aims, through a systematic review, to analyze the methods used in previous studies to identify oral fungi and their most frequent species in patients with the following conditions HIV infection, leukemia, and atopic dermatitis. A literature search was performed on several different databases. Inclusion criteria were written in English or Portuguese; published between September 2009 and September 2019; analyzed oral fungi of HIV-infected, leukemia, or AD patients. 21 studies were included and the most identified species was . The predominant methods of identification were morphological (13/21) and sugar fermentation and assimilation tests (11/21). Polymerase chain reaction (PCR) was the most used molecular method (8/21) followed by sequencing techniques (3/21). Although morphological and biochemical tests are still used, they are associated with high-throughput sequencing techniques, due to their accuracy and time saving for profiling the predominant species in oral mycobiome. Although morphological and biochemical tests are still used, they are associated with high-throughput sequencing techniques, due to their accuracy and time saving for profiling the predominant species in oral mycobiome. The potential of probiotics on the prevention and control of periodontitis and other chronic inflammatory conditions has been suggested. and species influence interaction with gingival epithelial cells (GECs) but may not act in a unique way. In order to select the most appropriate probiotic against , we aimed to evaluate the effect of several strains on biofilm formation and transcription virulence-associated factors (PgVAFs). Cell-free pH neutralized supernatants (CFS) and living spp. and spp. were tested against ATCC 33277 and W83, in mono- and multi-species (with and ) biofilms. Relative transcription of genes ( and ) was determined in biofilms and under GECs co-infection. Probiotics CFS reduced ATCC 33277 levels in mono-species biofilms and living probiotics reduced abundance in multi-species biofilms. LA5 down-regulated transcription of most PgVAFs in biofilms and GECs. Probiotics affect biofilm formation by down-regulating overall PgVAFs with the most pronounced effect observed for LA5. Probiotics affect P. gingivalis biofilm formation by down-regulating overall PgVAFs with the most pronounced effect observed for L. acidophilus LA5.is an obligate, asaccharolytic, gram-negative bacteria commonly associated with increased periodontal and systemic inflammation. P. gingivalis is known to survive and persist within the host tissues as it modulates the entire ecosystem by either engineering its environment or modifying the host's immune response. https://www.selleckchem.com/products/cx-5461.html It interacts with various host receptors and alters signaling pathways of inflammation, complement system, cell cycle, and apoptosis. P. gingivalis is even known to induce suicidal cell death of the host and other microbes in its vicinity with the emergence of pathobiont species. Recently, new molecular and immunological mechanisms and virulence factors of P. gingivalis that increase its chance of survival and immune evasion within the host have been discovered. Thus, the present paper aims to provide a consolidated update on the new intricate and unique molecular mechanisms and virulence factors of P. gingivalis associated with its survival, persistence, and immune evasion within the host. , a late colonizer of the periodontal biofilm, has been strongly associated with the chronic form of periodontitis. The aim of this study was to investigate the effects of a Dual Zinc plus Arginine formulation (aqueous solution and dentifrice) on the pathogenic properties of and the barrier function of an gingival epithelium model. The Dual Zinc plus Arginine aqueous solution and dentifrice inhibited the hemolytic and proteolytic activities of . The Dual Zinc plus Arginine aqueous solution and dentifrice enhanced the barrier function of an gingival epithelium model as determined by a time-dependent increase in transepithelial electrical resistance and decrease in paracellular permeability. This was associated with an increased immunolabeling of two important tight junction proteins zonula occludens-1 and occludin. The deleterious effects of on keratinocyte barrier function as well as the ability of the bacterium to translocate through a gingival epithelium model were attenuated in the presence of either Dual Zinc plus Arginine aqueous solution or dentifrice.