{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,8,7]],"date-time":"2026-08-07T20:05:58Z","timestamp":1786133158604,"version":"build-2736575974"},"reference-count":44,"publisher":"Ovid Technologies (Wolters Kluwer Health)","issue":"12","content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["JASN"],"published-print":{"date-parts":[[2017,12]]},"abstract":"\n Infiltration by IgG-positive plasma cells is a common finding in tubulointerstitial nephritis. Indeed, it has been thought that CD138-positive mature plasma cells secrete mainly IgG, and the occurrence of tubulointerstitial nephritis with CD138-positive plasma cells secreting IgM has rarely been reported. Routine immunofluorescence of fresh frozen sections is considered the gold standard for detection of immune deposits. However, the immunoenzyme method with formalin-fixed, paraffin-embedded sections is superior for detecting IgM- or IgG-positive cells within the renal interstitium, thus histologic variants may often go undetected. We recently discovered a case of tubulointerstitial nephritis showing IgM-positive plasma cell accumulation within the interstitium. To further explore the morphologic and clinical features of such cases, we performed a nationwide search for patients with biopsy-proven tubulointerstitial nephritis and high serum IgM levels. We identified 13 patients with tubulointerstitial nephritis and IgM-positive plasma cell infiltration confirmed with the immunoenzyme method. The clinical findings for these patients included a high prevalence of distal renal tubular acidosis (100%), Fanconi syndrome (92%), and anti-mitochondrial antibodies (82%). The pathologic findings were interstitial nephritis with diffusely distributed CD3-positive T lymphocytes and colocalized IgM-positive plasma cells, as well as tubulitis with CD3-positive T lymphocytes in the proximal tubules and collecting ducts. Additionally, levels of H\n +<\/jats:sup>\n -ATPase, H\n +<\/jats:sup>\n , K\n +<\/jats:sup>\n -ATPase, and the HCO\n 3<\/jats:sub>\n \u2212<\/jats:sup>\n -Cl\n \u2212<\/jats:sup>\n anion exchanger were markedly decreased in the collecting ducts. We propose to designate this group of cases, which have a common histologic and clinical form, as IgM-positive plasma cell\u2013tubulointerstitial nephritis.\n <\/jats:p>","DOI":"10.1681\/asn.2016101074","type":"journal-article","created":{"date-parts":[[2017,8,9]],"date-time":"2017-08-09T20:25:39Z","timestamp":1502310339000},"page":"3688-3698","source":"Crossref","is-referenced-by-count":31,"title":["Tubulointerstitial Nephritis with IgM-Positive Plasma Cells"],"prefix":"10.1681","volume":"28","author":[{"given":"Naoki","family":"Takahashi","sequence":"first","affiliation":[{"name":"Nephrology,"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Takako","family":"Saeki","sequence":"additional","affiliation":[{"name":"Department of Internal Medicine, Nagaoka Red Cross Hospital, Niigata, Japan;"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Atsushi","family":"Komatsuda","sequence":"additional","affiliation":[{"name":"Department of Hematology, Nephrology and Rheumatology, Akita University Graduate School of Medicine, Akita, Japan;"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Chishio","family":"Munemura","sequence":"additional","affiliation":[{"name":"Division of Medicine and Clinical Science, Tottori University Faculty of Medicine, Tottori, Japan;"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Takeaki","family":"Fukui","sequence":"additional","affiliation":[{"name":"Division of Medicine and Clinical Science, Tottori University Faculty of Medicine, Tottori, Japan;"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Naofumi","family":"Imai","sequence":"additional","affiliation":[{"name":"Division of Clinical Nephrology and Rheumatology, Niigata University Graduate School of Medical and Dental Sciences, Niigata, Japan;"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Noriyuki","family":"Homma","sequence":"additional","affiliation":[{"name":"Internal Medicine, Niigata 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