penisdoc.md

← all papers · spermatogenesis (58) Science journalism, not medical advice.

Gene Defect Leaves Sperm Trapped in Cytoplasm2026-07-15
A single gene defect leaves mouse and human sperm wrapped in leftover cytoplasm, misshapen, and infertile
SPEM2 deficiency disrupts spermiation leading to oligoasthenoteratozoospermia and male infertility male infertility genetics spermatogenesis animal study semen quality
Meet the Immune Cells Guarding Your Sperm Supply2026-06-23
A review of mouse studies argues rogue immune cells in the testis may drive some male infertility
Testicular macrophages: core immune regulators and emerging therapeutic targets in spermatogenic dysfunction male infertility spermatogenesis immunology testicular disease animal study narrative review
Two Hormones Beat One for Azoospermic Men2026-06-16
74% of azoospermic men produced sperm on hormone therapy; combination outperformed monotherapy 78% vs 33%
Therapeutic Benefits of Gonadotropins in Male Hypogonadotropic Hypogonadism hypogonadism male infertility spermatogenesis retrospective cohort pregnancy
Five Cell Death Routes Killing Sperm2026-06-16
Narrative review maps five regulated cell death pathways — apoptosis, autophagy, pyroptosis, ferroptosis, efferocytosis — as drivers of spermatogenic failure
Targeting Programmed Cell Death in Male Infertility: Pathogenic Mechanisms and Therapeutic Strategies male infertility spermatogenesis autophagy oxidative stress narrative review inflammation
Could a Blood Test Replace Testicular Biopsy?2026-06-15
A 2026 narrative review maps the landscape of non-invasive biomarkers for azoospermia diagnosis, covering small RNAs, proteomics, genetic markers, and imaging
Research Progress on the Pathogenesis and Diagnostic Biomarkers of Azoospermia male infertility biomarkers genetics genomics spermatogenesis narrative review
Two Cheap Drugs Beat One for Diabetic Testis Damage — In Mice2026-06-02
Combination metformin + vitamin C outperformed either drug alone on sperm viability and Johnsen scores in streptozotocin-diabetic mice (n=6/group)
Protective Effects of Metformin and Vitamin C on Diabetes-Induced Testicular Dysfunction animal study diabetes male infertility oxidative stress spermatogenesis
Male Infertility's Default Drug May Be Wrong for Most2026-06-01
Opinion review argues clomiphene and aromatase inhibitors are empirically prescribed without endocrine phenotyping — and proposes gonadotropins instead
From Tablets to Targeted Therapy: The APHRODITE Era in Male Infertility male infertility hypogonadism spermatogenesis narrative review evidence quality
Radiation Snaps the Hinge That Makes Sperm Swim2026-05-27
Synchrotron imaging in irradiated mice reveals the sperm annulus — a structural ring — as the primary fracture point after ionizing radiation exposure
Annulus Fracture Underlies Radiation-Induced Sperm Dysfunction Revealed by Multimodal Nano-Imaging animal study male infertility spermatogenesis environmental exposure semen quality
Can Varicocele Inflammation Reach the Penis?2026-05-25
A narrative review proposes that varicocele-driven systemic inflammation may impair erectile function — but the clinical evidence is thin
Advances in Immune-Inflammatory Interactions Within the Testicular-Penile Microenvironment of Varicocele Patients varicocele erectile dysfunction inflammation narrative review oxidative stress spermatogenesis immunology male infertility
Their Own Herbal Formula Fixed Sperm — in Mice2026-05-22
Mouse study: a team's proprietary herbal decoction improved sperm count and motility after drug-induced damage, via PI3K/Akt and MAPK pathways
Chinese Medicine Sheng Jing Decoction Alleviates Oligoasthenospermia by Modulating PI3K/Akt and MAPK Signaling Pathways animal study male infertility traditional chinese medicine spermatogenesis oxidative stress
Two Supplements Blunt Chemo's Testicular Damage — In Rats2026-05-21
Melatonin and apigenin each partially reversed paclitaxel-induced testicular damage in rats, raising Johnsen scores from 5 back to ~8 out of 9
Comparative Protective Effects of Melatonin and Apigenin Against Paclitaxel-Induced Testicular Injury in Rats: Oxidative Stress, DNA Damage, Apoptosis, and NF-κB Signaling animal study oxidative stress spermatogenesis testicular disease male infertility
New Gene Found Behind Structurally Broken Sperm2026-05-19
Knockout mice lacking DNAI4 are completely infertile with shattered sperm flagella, pointing to a candidate gene for the ~40% of human MMAF cases still unexplained.
DNAI4 is Required for Flagellum Assembly and Male Fertility in Mice animal study male infertility genetics spermatogenesis
Gut Bacteria May Hurt Sperm. The Evidence Is Thin.2026-05-16
A plausible gut-testis axis linking dysbiosis to poor sperm quality — authors themselves admit few human studies back it up
Gut Microbial Dysbiosis and Male Reproductive Health: Current Insights and Future Directions gut microbiome male infertility spermatogenesis narrative review testosterone inflammation
CML Drug Hits Developing Testes Hardest2026-05-14
Imatinib damages testes via c-KIT/PDGFR inhibition; neonatal exposure carries high irreversibility risk, adult exposure is more forgiving
A Scoping Review of Imatinib-Induced Testicular Toxicity and Male Fertility Impairment male infertility spermatogenesis scoping review pharmacovigilance pediatric urology
Immune War in the Testis — Mostly Mouse Data2026-05-12
A review proposes that a shared immune-inflammatory cascade disrupts sperm production — then admits most evidence comes from animals, not men.
Immunological Mechanisms and Precision Stratification in Male Infertility immunology male infertility inflammation oxidative stress narrative review biomarkers spermatogenesis
Plastic Chemicals May Rewrite Fertility Across Generations2026-05-08
A narrative review argues BPA harms male fertility via gut dysbiosis and epigenetic marks — but admits the transgenerational evidence is provisional at best
Transgenerational Exposure to Plastics-Derived Endocrine-Disrupting Bisphenol A and Its Analogs on Male Infertility: Impact of Gut Dysbiosis and Epigenetic Regulation environmental exposure epigenetics male infertility narrative review spermatogenesis gut microbiome
Diabetes Breaks Both Sperm and Memory — Here's How2026-05-08
A narrative review proposes shared neuroendocrine-immune pathways linking diabetic infertility and cognitive decline — no new data, theory only
The relationships between diabetic male infertility, diabetic cognitive impairment, and the neuroendocrine-immune network: A review diabetes male infertility narrative review spermatogenesis neurodegenerative diseases
One Y Chromosome Deletion Beats Two for Sperm Retrieval2026-05-07
AZFc deletions yield sperm retrieval in 58.85% of azoospermic men; complete AZFa/b deletions are essentially futile for TESE.
Y Chromosome and Male Fertility: The AZF Genes and Their Deletion genetics male infertility spermatogenesis genomics
Lab-Grown Mini-Testes Make Hormones — Sperm Still Elusive2026-05-06
Testicular organoids sustain testosterone and inhibin B production for up to 12 weeks in culture, but complete spermatogenesis remains out of reach
Generation and Utility of Endocrine Functional Testicular Organoids stem cells spermatogenesis male infertility narrative review testicular disease
Viral Orchitis Treatments Still Largely Inadequate2026-05-05
This narrative review covers how viruses like HIV and mumps damage testicular function—and admits current treatments fall short
Viral Orchitis and Male Infertility: A Comprehensive Review of Pathogenic Mechanisms and Outcomes male infertility orchitis spermatogenesis inflammation narrative review immunology
A Third Way Sperm Cells Die: Ferroptosis2026-05
Review maps three oxidative stress-driven cell death pathways in testicular tissue, spotlighting ferroptosis as an understudied mechanism
Oxidative Stress-Related Programmed Cell Death in Male Infertility: Focussing on Ferroptosis male infertility oxidative stress spermatogenesis narrative review iron metabolism autophagy
Can Metformin Treat Male Infertility?2026-04-29
Review argues AMPK—an energy-sensing enzyme disrupted by obesity and diabetes—could be a druggable target for male infertility
Targeting AMPK Networks for Male Reproductive Health: Mechanisms and Emerging Therapies male infertility metabolic syndrome spermatogenesis narrative review oxidative stress testosterone
TCM Sperm Pill: 56 Animal Studies, 8 Human Trials2026-04-16
A PRISMA-screened evidence map finds mechanistic plausibility but only 8 clinical trials — most evidence is animal data
Multi-component, multi-target actions of Wuzi Yanzong Pill in male infertility: An evidence map linking clinical signals to mechanistic networks. male infertility traditional chinese medicine spermatogenesis oxidative stress evidence quality
Testosterone-Tipped Nanoparticles Find the Testes in Mice2026-04-15
Nanoparticles carrying green tea extract (EGCG) and zinc reduced testicular inflammation and preserved sperm structure in a mouse orchitis model
Testosterone-Modified Liposomes Loaded with the Zn-Polyphenol Complex for Treatment of Male Infertility animal study male infertility inflammation oxidative stress spermatogenesis
Beyond Overheating: Varicocele's Multi-Front War on Sperm2026-04-15
Narrative review maps varicocele's damage chain: dilated veins trigger heat, oxidative damage, inflammation, and immune attacks that collectively wreck sperm
Testicular Microenvironment Disruption in Varicocele: Mechanisms and Implications for Spermatogenesis varicocele male infertility oxidative stress spermatogenesis narrative review
The Gene That Breaks Sperm—But Not Eggs2026-04-15
Mice lacking the RNA-binding protein LARP1 produce sperm with defective flagella, malformed heads, and poor motility — females are unaffected
Deficiency of LARP1 Impairs Spermatogenesis and Leads to Male Subfertility in Mice animal study male infertility spermatogenesis genetics
Adding Testosterone Cuts Drug Dose, Not Sperm Rates2026-04-01
Triple therapy (hCG + FSH + testosterone) cut the median hCG dose needed by 17% but didn't significantly improve spermatogenesis rates in 45 CHH men
Comparing the response of triple therapy and conventional treatment in male congenital hypogonadotropic hypogonadism: a randomized controlled trial hypogonadism spermatogenesis testosterone infertility
Three Mouse Studies Don't Make a Therapy2026-03-31
A systematic review of exactly 3 mouse studies concludes fat-cell secretions partially regenerate chemotherapy-damaged testes — in rodents
Adipose-Derived Mesenchymal Stem Cell Secretome Promotes Testicular Regeneration Following Chemically Induced Injury: A Review of Preclinical Studies male infertility stem cells animal study spermatogenesis
A Mouse "Space Sperm" Study Finds a Fertility Protein2026-03-31
Mouse and cell study ties a mitochondrial peptide to sperm cell survival under simulated microgravity stress
Mitochondrial-Derived Peptide MOTS-c Targets SLC7A11 to Preserve Spermatogenesis by Suppressing Ferroptosis male infertility spermatogenesis oxidative stress animal study biomarkers
Too Many Gene Copies Wreck Yak Hybrid Sperm2026-03-21
Yak Y chromosomes carry 2–4× more active sperm-related gene copies than cattle; researchers propose this mismatch explains complete hybrid male sterility
Divergent Amplification of Y-Linked Dosage-Sensitive Genes Triggers Regulatory Mismatch Underlying Cattle-Yak Male Sterility male infertility spermatogenesis genomics animal study
Heat Kills Sperm. Can L-Citrulline Help? Ask a Pig2026-03-20
A narrative review of mostly animal data argues L-citrulline may protect sperm from heat damage via nitric oxide pathways — human evidence is thin
Heat Stress-Mediated Oxidative Damage in Male Germ Cells: Potential Protective Effects of L-Citrulline oxidative stress male infertility spermatogenesis animal study
One Gene Deletion Kills All Sperm Maturation in Mice2026-03-20
Knocking out a single gene in mice triggers complete male infertility by blocking the histone-to-protamine swap that compacts sperm DNA
PRAMEL12 orchestrates spermiogenesis to ensure male fertility in mice animal study male infertility spermatogenesis genetics epigenetics
Ginger Improves Sperm in Obese Rats — Humans TBD2026-03-20
Ginger and fenofibrate each reversed obesity-induced sperm and hormone deficits in rats — no human data exists
Effect of Ginger Extract and/or Fenofibrate on the Associated Infertility of Experimentally Induced Obese Wistar Albino Male Rats animal study obesity male infertility oxidative stress spermatogenesis testosterone
When the Testes Lose Their Immune Shield2026-03-17
A narrative review estimates up to 15% of male infertility stems from immune dysregulation at the blood-testis barrier
Testicular Immune Privilege Revisited: When Protection Fails male infertility immunology narrative review antisperm antibodies spermatogenesis infertility
The Cilia Gene Running the Sperm Factory2026-03-15
Knocking out a cilia gene in fish collapses the testicular niche — sperm motility fails and Sertoli cells die off before sperm do
NPHP4 Deficiency Disrupts Testicular Homeostasis and Impairs Male Fertility in Medaka (*Oryzias latipes*) animal study male infertility spermatogenesis genetics
In Cryptorchidism, the Support Cells Fail First2026-03-07
In a mouse cryptorchidism model, Sertoli and peritubular myoid cells show stress signals within 3 days — before germ cells begin dying
Somatic Cell Dysfunction Precedes Testicular Degeneration in a Surgical Model of Cryptorchidism cryptorchidism animal study pediatric urology spermatogenesis
The 'We Don't Know' Label Hiding Oxidative Damage2026-03-03
Up to 40% of male infertility is labeled "idiopathic" — this review argues that's a diagnostic failure, not a biological reality
Idiopathic Male Infertility Revisited: Can Redox Endophenotypes Reframe the 'Idiopathic' Label? male infertility oxidative stress biomarkers spermatogenesis
Vitamins Nudge Sperm Motility, Not Much Else2026-03-02
Antioxidant/vitamin combo raised sperm motility from 17% to 24% in infertile men — statistically significant, still well below normal
Therapeutic Supplementation With Antioxidants and Vitamins Improved Sperm Motility Among Infertile Men With Idiopathic Low Spermatogenesis male infertility oxidative stress spermatogenesis semen quality cohort study
Wheat Protein Tanks Rat Testosterone and Sperm2026-02-27
Wheat germ agglutinin at 250 mg/kg/day impaired sperm quality, cut testosterone, and damaged testicular tissue in prepubertal rats across 2–10 weeks
From Food to Infertility: Disruption of the Male Reproductive Axis by Wheat Lectin in Rats animal study male infertility oxidative stress spermatogenesis
Horny Goat Weed Gets a Mechanistic Review2026-02-26
A narrative review maps how icariin, horny goat weed's active compound, may improve sperm function — mostly in rodents
Icariin in Male Reproduction: Multi-Target Pharmacological Mechanisms and Therapeutic Potential traditional chinese medicine male infertility oxidative stress animal study spermatogenesis
Gene Variant Predicted Zero Sperm in Every Case2026-02-18
Biallelic MEI1 mutations found in 1.9% of azoospermic men; surgical sperm retrieval failed 12/12 times
A common cause of non-obstructive azoospermia: biallelic MEI1 variants and implications for infertility diagnostics. genetics genomics male infertility spermatogenesis
Diet Sweeteners Flag a Fertility Gene — In Mouse Cells2026-02-17
Computational screening flagged aspartame, neotame, and sucralose as reproductive toxins targeting FGFR1; validated only in mouse Leydig cells in a dish
Artificial sweeteners and male infertility: Network toxicology and experimental evidence reveal FGFR1 as the critical target. male infertility environmental exposure animal study spermatogenesis
The Cleanup Crew Sperm Can't Live Without2026-02-13
Review surveys mouse knockout evidence linking ubiquitin-editing enzymes to spermatogenic failure; no human clinical data
The Potential Role of Deubiquitinating Enzymes (DUBs) in Male Fertility male infertility genetics animal study spermatogenesis
Why Some Sperm Can't Swim: A Molecular Tag2026-02-09
Kmal levels were significantly elevated in asthenozoospermic men and inversely correlated with progressive motility across 94 participants
Lysine Malonylation Regulates Human Sperm Motility male infertility semen quality spermatogenesis biomarkers
Same DNA Repair Flaw, Infertile Men and Women2026-02-05
Exome sequencing of three consanguineous families found homozygous loss-of-function variants in SPIDR, TOP6BL, or RAD51AP2 — all meiotic DNA repair genes — causing infertility in both sexes.
Disruption of Meiotic Double-Strand Break Dynamics Provokes Germline Human Infertility in Both Sexes genetics male infertility infertility spermatogenesis
X-Linked Gene Found in Sperm Failure, Monkeys Confirm It2026-01-27
A primate-exclusive X-linked gene, TFDP3, was defective in 8 infertile men with OAT — and silencing it in monkeys replicated the phenotype
Deficiency of Primate-Specific TFDP3 Causes Male Infertility with Oligoasthenoteratozoospermia in Humans and Cynomolgus Monkeys genetics male infertility spermatogenesis animal study
Gene Variant Floods Sperm With Chromosome Errors2026-01-25
A single inherited frameshift variant left 18.8% of one man's sperm missing sex chromosomes entirely — and drove repeated miscarriages
Homozygous C12orf40 Variant Contributes to Severe Oligoasthenoteratozoospermia and Sperm Sex Chromosome Aneuploidy genetics male infertility spermatogenesis case report pregnancy
The Cell-Recycling Process Tied to Broken Sperm2026-01-20
A review of animal and lab data argues autophagy imbalance may drive low sperm count and motility, no new evidence
A narrative review on the role of autophagy in male infertility-associated sperm abnormalities autophagy male infertility spermatogenesis narrative review
Genetic Testing Solves Only 1 in 13 Infertility Cases2026-01-03
India's largest male infertility genomics cohort found a genetic cause in just 7.7% of 247 men with severe sperm defects
Genetic Diversity of Infertile Males in India genetics male infertility spermatogenesis infertility
Ancient TCM Formula Targets Copper-Mediated Sperm Death2025-12-13
A rat study found Zuogui Wan improved sperm quality partly by reducing testicular copper accumulation and suppressing cuproptosis
Research on the Mechanism of Zuogui Wan in Ameliorating Oligoasthenozoospermia in Rats via Modulating Cuproptosis-Related Pathways animal study male infertility spermatogenesis traditional chinese medicine oxidative stress
The Test Your Fertility Clinic Isn't Running2025-12-03
A narrative review arguing that histone modifications in sperm—disrupted by toxicants and lifestyle—may explain a large share of "unexplained" infertility cases.
Epigenetic Dysregulation in Idiopathic Male Infertility: The Role of Aberrant Histone Post-Translational Modifications epigenetics male infertility environmental exposure oxidative stress spermatogenesis
Mice Missing CFAP77 Are Subfertile, Not Sterile2025-11-29
Mice engineered to lack a sperm tail protein called CFAP77 had sluggish sperm and fewer pups, but weren't infertile
Microtubule Inner Protein CFAP77 Contributes to Sperm Motility and Male Fertility in Mice male infertility animal study spermatogenesis genetics
Sperm's "Power Plant" Role Has Been Overstated2025-11-11
The textbook model of sperm energy production — mitochondria fuel the tail — is more complicated than it looked
Sperm mitochondrial sheath formation - how and why? male infertility spermatogenesis narrative review infertility
Swapping One Protein Rescues Infertile Mouse Sperm Cells2025-10-28
Deleting a common protein-recycling complex stops sperm cell development in mice — swapping in a related complex fixes it
The constitutive 20S proteasome is required for the maintenance and differentiation of spermatogonia in mice male infertility spermatogenesis animal study genetics
Nanoparticles Sneak ATP Past the Testicular Wall2025-10-13
ATP-loaded nanoparticles crossed the testicular barrier in mice and improved sperm motility — no human data yet
Blood-Testis Barrier-Crossing Extracellular Vesicles for Asthenozoospermia Therapy via Synergistic ATP Replenishment and Ferroptosis Suppression male infertility spermatogenesis stem cells oxidative stress animal study
GLP-1 Drugs and Sperm: Mostly Rat Data So Far2025-09-26
Ozempic-class drugs may help sperm in obese men, but most of the evidence so far is from rats
Impact of GLP-1 Receptor Agonists on Male Fertility: Emerging Evidence and Future Directions obesity diabetes hypogonadism spermatogenesis animal study narrative review
FSH Pharmacogenetics: Interesting Science, Unusable Data2025-04-30
Genetic variants in FSH and its receptor affect sperm production, but current evidence is too small and contradictory for clinical use
Pharmacogenetics of Follicle-Stimulating Hormone Action in the Male male infertility genetics infertility narrative review spermatogenesis
hCG for Azoospermia: Settled Science for One Type, Guesswork for the Rest2025-02-04
A narrative review argues hCG may treat more azoospermia subtypes than currently accepted, introducing the unvalidated "APHRODITE criteria" to guide patient selection.
Human Chorionic Gonadotropin-Based Clinical Treatments for Infertile Men with Non-Obstructive Azoospermia male infertility spermatogenesis hypogonadism narrative review