candida culture and strain identification in patients with pss

pSS 관련 구강 칸디다의 진단 및 균주 식별

Candidiasis is caused by Candida spp., which are opportunistic pathogens. Common strains include Candida albicans, Candida krusei, Candida glabrata, Candida parapsilosis, and Candida dubliniensis1. Opportunistic infections caused by Candida spp. include superficial Candida infections and invasive candidiasis. Invasive candidiasis mainly happens in immunocompromised individuals; for example, in patients with acquired immunodeficiency syndrome (AIDS), invasive candidiasis can significantly threaten the quality of life or even the life span2. Superficial Candida infection, such as mucocutaneous candidiasis, is more common in patients3. 
Oral candidiasis, a superficial Candida infection, is the most common human fungal infection. Candida albicans is a normal commensal of the mouth; the carriage rate of Candida spp. has been reported to range from 20% to 75% in the general population without any symptoms4. Overgrowth of Candida can lead to local discomfort in patients, such as the altered taste of sensation, burning sensation in the mouth, dysphagia due to poor nutrition, delayed recovery, and prolonged hospital stay. Long-term oral candidiasis can lead to severe invasive candidiasis, resulting in significant morbidity and mortality5. Oral candidiasis can also increase the risk of oral cancer5. Impaired salivary gland function is among the risk factors for oral candidiasis6. The initiation of infection is the adhesion of Candida to epithelial cell walls. This is followed by the proliferation and filamentation of Candida and the formation and maturation of biofilm7. Biofilms are extremely difficult to eradicate and are resistant to conventional antifungal treatment, making clinical treatment a challenge for biofilm-associated oral Candida infection7.
Primary Sj&#246;gren's syndrome (pSS) is an autoimmune disease that is characterized by dry mouth, dry eyes, and other systematic symptoms8. Dry mouth is the most frequent symptom of pSS. Saliva has important physiological antifungal functions. On the one hand, it can dilute and scour the mouth and thereafter remove organisms from the mucosa. On the other hand, saliva contains antimicrobial proteins, such as lactoferrin, sialoperoxidase, lysozyme, histidine-rich polypeptides, and specific anti-candidal antibodies, which can interact with the oral mucosa and prevent the overgrowth of Candida6. The reduced saliva flow may predispose pSS patients to oral candidiasis. An observational cross-sectional study conducted in 61 pSS patients found that 13.1% of pSS patients presented oral signs of candidiasis and colony forming unit (CFU)/mL of Candida albicans was found significantly and negatively correlated with levels of unstimulated whole saliva (UWS) and stimulated whole saliva (SWS)9.
The methods introduced in this manuscript can identify oral Candida infection based on characterized morphological attributes (e.g., the hyphae and yeast cells) in direct smear or after culturing10. The strain identification of the Candida using a Candida diagnostic agar is based on the formation of different colored colonies with varied morphology, which result from the cleavage of chromogenic substrates by species-specific enzymes11. In this manuscript, systematic methods for detecting oral Candida infection are introduced, including traditional oral Candida culture and rapid examination by potassium hydroxide (KOH) smear test and calcofluor white (CFW) staining assay10. Additionally, the antifungal susceptibility test, which can guide clinical oral Candida infection treatment, has been introduced. In actual situations, it is not necessary to perform all of the introduced methods in this manuscript; the oral Candida detection method(s) can be selected according to the purpose. The examination of oral Candida infection and the determination of Candida strains in pSS patients not only benefit the disease treatment but also help assess the characterization of oral candidiasis and the species profiles.

저자 스포트라이트: pSS 환자를 위한 임상 치료 요법을 발전시키기 위한 경구용 칸디다 진단

원발성 쇼그렌 증후군 환자의 구강 칸디다 감염 검사

In this research, we present a protocol for the examination of oral candida infection in patients with primary Sjogren syndrome, which can be used for timely treatment to avoid infection-related complications. We provide a series of systematic, simple, and feasible methods for detecting oral candida infections, identifying candida strains, and testing the antifungal susceptibility of commonly-used drugs in patients with primary Sjogren's syndrome. Maybe our focus on the role of oral candida infection in the onset and the progression of primary Sjogren's syndrome pathologists in our future studies.

칸디 다 pSS 환자의 배양 및 균주 식별

시작하려면 PBS에서 환자의 타액 샘플을 얻습니다. SD 한천 분말 7g을 이중 증류수 100ml에 녹입니다. 오토클레이브를 사용하여 섭씨 121도에서 15분 동안 배지를 살균합니다.약 10 밀리리터의 배지를 10 센티미터 미생물 배양 접시에 붓고 식힌 다음 한천 표면에 200 마이크로 리터의 타액 샘플을 줄무늬로 만들고 섭씨 37도에서 48 시간 동안 배양합니다. 칸디다 진단용 한천 배지를 준비하려면 분말 4.77g을 이중 증류수 100ml와 혼합합니다. 혼합물이 약간 끓을 때까지 섭씨 100도로 가열한 다음 각 10cm 미생물 배양 접시에 약 10mL의 배지를 분배하고 응고시킵니다.다음으로, 칸디다 콜로니를 500 마이크로 리터의 SD 배지로 옮기고 피펫을 사용하여 완전히 현탁시킵니다. 현탁액 50 마이크로 리터를 진단 한천에 도금하고 섭씨 37도에서 48 시간 동안 플레이트를 배양합니다. 마지막으로, 특정 콜로니 색상과 패턴을 사용하여 성숙한 콜로니의 균주를 식별합니다.칸디다 진단 한천을 사용한 칸디다 균주 식별 분석은 원발성 쇼그렌 증후군 환자가 칸디다 알비칸스, 칸디다 글라브라타, 칸디다 알비칸스와 칸디다 크루세이의 구강 감염을 가지고 있음을 보여주었습니다.

Research

JoVE Journal

Medicine

Candida Culture and Strain Identification in Patients with pSS

Examination of Oral Candida Infection in Primary Sj&#246;gren&#39;s Syndrome Patients

Primary Sj&#246;gren's syndrome (pSS) is an autoimmune disease characterized by symptoms such as dry mouth, dry eyes, and other systematic symptoms. Due ...

연구

의학

Sample Collection for Diagnosis of Oral Candida in pSS Patients

pSS 환자의 구강 칸디다 진단을 위한 검체 수집

Rapid Detection of Oral Candida Infection in pSS Patients Using KOH Smear Test and CFW Staining Assay

KOH 도말 검사 및 CFW 염색 분석을 사용한 pSS 환자의 구강 칸디다 감염의 신속한 검출