{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,8,18]],"date-time":"2026-08-18T02:46:32Z","timestamp":1787021192097,"version":"build-2736575974"},"reference-count":54,"publisher":"The Endocrine Society","issue":"12","license":[{"start":{"date-parts":[[2025,4,15]],"date-time":"2025-04-15T00:00:00Z","timestamp":1744675200000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"German Society of Andrology"},{"DOI":"10.13039\/501100001659","name":"Deutsche Forschungsgemeinschaft","doi-asserted-by":"publisher","id":[{"id":"10.13039\/501100001659","id-type":"DOI","asserted-by":"publisher"}]},{"name":"Clinical Research Unit","award":["CRU326"],"award-info":[{"award-number":["CRU326"]}]},{"name":"Clinical Research Unit","award":["329621271"],"award-info":[{"award-number":["329621271"]}]},{"DOI":"10.13039\/501100004869","name":"University of M\u00fcnster","doi-asserted-by":"publisher","award":["SC112316"],"award-info":[{"award-number":["SC112316"]}],"id":[{"id":"10.13039\/501100004869","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":[],"published-print":{"date-parts":[[2025,11,18]]},"abstract":"<jats:title>Abstract<\/jats:title>\n                  <jats:sec>\n                    <jats:title>Context<\/jats:title>\n                    <jats:p>Nonobstructive azoospermia (NOA) constitutes male infertility with complete absence of sperm in the ejaculate. NOA can originate in testicular malfunction or in endocrine dysregulation. Elevated follicle-stimulating hormone (FSH) levels are diagnostically valuable for NOA.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Objective<\/jats:title>\n                    <jats:p>An azoospermic patient cohort comprising 79 men and exhibiting no obstruction but normal FSH levels was identified. Focusing on this normogonadotropic nonobstructive azoospermic (NNOA) group, the study aimed to characterize these patients in depth.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Methods<\/jats:title>\n                    <jats:p>Whether the missing FSH upregulation in patients with NNOA is due to testicular or pituitary\/hypothalamic malfunctions was examined by analyzing somatic, endocrine, and testicular parameters compared with 87 men with hypergonadotropic NOA and 88 normozoospermic men.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Results<\/jats:title>\n                    <jats:p>Testicular phenotypes of patients with NNOA and NOA were compared in histologically stratified subgroups (most advanced germ cell type). Using flow cytometry, the samples were evaluated for testicular cell composition by ploidy analysis. Concerning the distinct histological classification (hypospermatogenesis, spermatogenic arrest, Sertoli cell only, tubular atrophy) NNOA men produced more elongated spermatids and showed higher sperm retrieval. Testicular tissue composition between patients with NNOA and patients with NOA only differed after meiosis.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Conclusion<\/jats:title>\n                    <jats:p>The missing FSH upregulation in NNOA might be due to a testicular malfunction, as both FSH and testosterone were normal and NNOA spermatogenesis differed only after meiosis. Two explanations are possible: NNOA represents a phenotype in which spermatogenesis fails\u2014different from NOA\u2014only at the postmeiotic level, leaving FSH regulation unaffected, or the same mechanism underlies both NNOA and NOA, but the groups are at different stages of progression of the same disorder.<\/jats:p>\n                  <\/jats:sec>","DOI":"10.1210\/clinem\/dgaf200","type":"journal-article","created":{"date-parts":[[2025,4,12]],"date-time":"2025-04-12T16:40:40Z","timestamp":1744476040000},"page":"3400-3411","source":"Crossref","is-referenced-by-count":6,"title":["Unraveling a Subgroup of Men With Unexplained Male Infertility\u2014Men With Normogonadotropic Nonobstructive Azoospermia"],"prefix":"10.1210","volume":"110","author":[{"given":"Vanessa","family":"Schwarzkopf","sequence":"first","affiliation":[{"name":"Centre of Reproductive Medicine and Andrology, Institute of Reproductive and Regenerative Biology, University of M\u00fcnster , M\u00fcnster 48149 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