Inventra Medclin Biomedical Healthcare and Research Center, Kalyan (2026)

25/02/2026

A Japanese scientist changed our understanding of how the human body survives, heals, and renews itself at the smallest possible level. His name is Yoshinori Ohsumi, and his groundbreaking research revealed a hidden survival system inside our cells that activates when food is scarce.

Ohsumi proved that during periods of fasting or low nutrition, the body begins a process where cells break down and recycle their own damaged, old, or dysfunctional parts. Instead of letting waste build up, the body intelligently cleans house, transforming cellular debris into energy and raw materials to keep vital systems running. This powerful mechanism acts like a biological reset button, allowing the body to repair itself from the inside out.

Before his work, scientists knew this process existed but didn’t understand how it functioned or how essential it was for survival. Ohsumi mapped the genes responsible and demonstrated just how crucial this self recycling system is for health, aging, immunity, and disease prevention. His discoveries opened new doors in medicine, influencing research into cancer, neurodegenerative disorders, inflammation, and longevity.

In simple terms, he showed that the body isn’t helpless during hunger. Instead, it becomes smarter, cleaner, and more efficient. By consuming its own damaged cells, the body protects itself, renews tissues, and maintains balance. It is one of nature’s most elegant survival strategies.

This revelation earned Ohsumi the Nobel Prize and reshaped modern biology. More than just a scientific breakthrough, it changed how we think about fasting, healing, and the body’s incredible ability to restore itself when given the chance.

22/02/2026

🔄 Renin-Angiotensin-Aldosterone System (RAAS)

(Guyton & Hall Physiology, 14th Ed | Harrison’s Principles of Internal Medicine, 21st Ed)

1️⃣ Step-by-Step Pathway

① Liver: Synthesizes angiotensinogen (α₂-globulin)
② Kidney (JGA): Releases renin in response to:
↓ Renal perfusion pressure (e.g., hemorrhage)
↓ NaCl delivery to macula densa
β₁-adrenergic stimulation

③ Lung Endothelium: ACE converts Ang I → Ang II (half-life: 1–2 mins)
• Fun fact: ACE also degrades bradykinin (explains ACEi cough)

2️⃣ Angiotensin II Actions

Vascular:
• Potent vasoconstriction (via AT₁ receptors) → ↑ Systemic vascular resistance

Endocrine:
• Adrenal cortex: Stimulates aldosterone (↑ ENaC channels in CD)
• Posterior pituitary: ↑ ADH (aquaporin-2 insertion)

Renal:
• Constricts efferent > afferent arterioles → ↑ GFR (but ↓ RBF)
• ↑ Na⁺/H₂O reabsorption (PCT & CD)

3️⃣ Clinical Correlates

Hypertension:
• ACE inhibitors: ↓ Ang II + ↑ bradykinin (monitor for hyperkalemia)
• ARBs: Block AT₁ selectively (no cough)

Heart Failure:
• Aldosterone escape phenomenon → need MRAs (eplerenone/spironolactone)

Renal Artery Stenosis:
• Goldblatt kidney → ↑ renin → refractory HTN (check renal duplex)

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📊 Mnemonic: “RAAS Effects”

Retain Na⁺
Aldosterone ↑
ADH released
Sympathetic activated

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📚 Visit our website for more high-yield medical notes: mediconotes.com

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22/02/2026

When the Nobel Prize for in vitro fertilisation (IVF) was announced, thousands of greetings poured in for the scientist behind its development, Robert Edwards:

"Congratulations - my partner & I are about to go into IVF. Without you we would have no hope. You have given hope to millions. Thank you."

IVF is a medical procedure whereby an egg is fertilised by s***m outside the body. More than 10% of all couples worldwide are infertile and today millions of individuals have been born thanks to IVF. Edwards explained how eggs mature and how s***m is activated. In cooperation with Patrick Steptoe he found a method for removing eggs from the ovaries, and with Jean Purdy he found a way to achieve fertilisation outside the body.

On this day in 1969, the results were presented in the journal Nature and in 1978 the first child was born as a result of IVF. 'In vitro' means a process taking place in a test tube, culture dish, or elsewhere outside a living organism.

Learn more about Edwards: https://bit.ly/3rcP9nB

22/02/2026

Pathogenesis of migraine, integrating current neurovascular and neurochemical models.

1. Genetic and neuronal predisposition

Migraine is a genetically primed brain disorder. People with migraine have:

Hyperexcitable cortical neurons
Altered ion channel function (especially calcium and sodium channels)
Lower threshold for sensory overload (light, sound, stress)
This makes the brain unusually reactive to internal or external triggers.

2. Trigger → cortical dysfunction

Common triggers (stress, sleep deprivation, hormonal changes, certain foods) disturb brain homeostasis, leading to:

Excess glutamate release
Reduced inhibitory GABA tone
Increased neuronal firing
This sets the stage for abnormal cortical activity.

3. Cortical spreading depression (CSD) – mainly in migraine with aura

CSD is:
A slow wave of intense neuronal depolarization
Followed by prolonged neuronal suppression
Propagates across the cortex at ~3–5 mm/min

Consequences:

Explains visual/sensory aura
Causes local ionic shifts (↑ K⁺, ↑ H⁺)
Activates trigeminal nociceptors indirectly
Even migraines without aura may involve “silent” CSD.

4. Activation of the trigeminovascular system (core mechanism)

This is the central pain pathway in migraine.
Components:
Trigeminal nerve (ophthalmic division)
Meningeal blood vessels
Brainstem nuclei (trigeminal nucleus caudalis)

What happens:
Activated trigeminal fibers release neuropeptides:
CGRP (calcitonin gene-related peptide) – key mediator
Substance P
Neurokinin A

Effects:
Vasodilation of meningeal vessels
Plasma protein extravasation
Neurogenic inflammation

5. Neurogenic inflammation (non-infectious)

Not classic inflammation, but:
Mast cell degranulation
Increased vascular permeability
Sensitization of peripheral nociceptors
This amplifies pain signaling.

6. Central sensitization

With ongoing input:
Second-order neurons in the brainstem become hyperresponsive
Pain spreads beyond original site

Explains:
Cutaneous allodynia
Prolonged headache
Reduced response to late treatment
This is why early treatment works better.

7. Brainstem and hypothalamic involvement

Functional imaging shows activation of:
Periaqueductal gray (PAG)
Dorsal pons
Hypothalamus

Roles:
Modulate pain pathways
Explain premonitory symptoms:
Yawning
Food cravings
Mood changes
Sleep disturbance
Migraine is not just a vascular headache — it’s a brain network disorder.

8. Role of CGRP (central and peripheral)

CGRP:
Is elevated during attacks
Correlates with pain severity
Normalizes after treatment

This explains why:
Triptans (↓ CGRP release)
CGRP monoclonal antibodies
CGRP receptor antagonists (gepants)
are effective therapies.

9. Resolution phase

Pain subsides due to:
Downregulation of trigeminal firing
Clearance of neuropeptides
Rebalancing of cortical excitability
Postdrome (“migraine hangover”) reflects lingering central dysfunction.

One-sentence summary

Migraine is a genetically primed disorder of brain excitability leading to cortical dysfunction, trigeminovascular activation, CGRP-mediated neurogenic inflammation, and central sensitization.

13/02/2026

Nature Reviews Neuroscience: Maladaptive central autonomic remodelling that occurs in response to heart failure and hypertension drives sympathetic overactivity and cardiac dysfunction. In this Review, the authors discuss the neural, glial and molecular mechanisms underlying these changes, as well as emerging neuromodulatory strategies aimed at restoring autonomic balance.

Link to the Review in the comments.

13/02/2026

Did you know that our body 'eats' itself in order to stay healthy?

Autophagy, or 'self-eating' refers to the way our cells can destroy their contents, by breaking them down and recycling them in a compartment called the lysosome. In the 1990s, Yoshinori Ohsumi discovered how autophagy worked. His discoveries helped us better understand how our cells manage malnutrition and infections, and protect us against disease.

Ohsumi was awarded the 2016 Nobel Prize in Physiology or Medicine.

Learn more: https://bit.ly/2yw7ztz

13/02/2026

Why We Age: Telomeres Explained

Telomeres are protective DNA–protein structures located at the ends of chromosomes. They act like biological “caps,” preventing chromosome damage and fusion during cell division.

Each time a cell divides, telomeres become slightly shorter. Over time, critically short telomeres trigger cellular senescence or programmed cell death, limiting the cell’s ability to replicate. This gradual shortening is associated with aging and age-related cellular decline.

The enzyme telomerase can extend telomeres in certain cells, such as stem cells, but its activity is limited in most body cells. Telomere dynamics are therefore closely linked to cellular lifespan and biological aging.

13/02/2026

The Extracellular Matrix: A Double-Edged Regulator of Tumor Growth👇

✅The extracellular matrix (ECM) is not a passive scaffold in tumors. It is a dynamic and multifunctional component of the tumor microenvironment that can either suppress or promote cancer progression, depending on its composition, organization, and signaling activity.

✅On the anti-tumour side, the ECM can physically restrict tumour growth. A dense and well-organized matrix limits cancer cell expansion and invasion, acting as a structural barrier against uncontrolled proliferation.

✅The ECM also plays a key role in inhibiting angiogenesis. By regulating growth factor availability and vessel formation, it can limit nutrient and oxygen supply to the tumour, thereby constraining tumour development.

✅Immune modulation is another important anti-tumour function of the ECM. It can influence immune cell behavior, including macrophage polarization and the recruitment and activation of cytotoxic T cells, strengthening immune-mediated tumour suppression.

✅In contrast, ECM remodeling can drive pro-tumour functions. Altered ECM stiffness generates mechanical stress that activates oncogenic signaling pathways, enhancing cancer cell survival, proliferation, and invasiveness.

✅The ECM can also promote tumour growth by providing structural support and facilitating angiogenesis, ensuring a continuous supply of nutrients and oxygen to rapidly dividing cancer cells.

✅Additionally, ECM-derived signals contribute to the establishment of a pro-inflammatory microenvironment. Chronic inflammation within the ECM niche supports tumour progression, immune evasion, and therapy resistance.

✅Overall, the ECM acts as a double-edged sword in cancer. Understanding how its anti- and pro-tumour functions are balanced offers important opportunities for therapeutic intervention aimed at reprogramming the tumor microenvironment.

12/02/2026

𝐖𝐡𝐚𝐭 𝐝𝐨 𝐲𝐨𝐮 𝐧𝐞𝐞𝐝 𝐭𝐨 𝐤𝐧𝐨𝐰 𝐚𝐛𝐨𝐮𝐭 𝐍𝐢𝐩𝐚𝐡 𝐯𝐢𝐫𝐮𝐬?
Nipah virus causes a rare but serious illness that can spread from animals (such as bats or pigs) to people, contaminated fruits or fruit products - and sometimes between people.

Outbreaks are usually small and containable.

𝐖𝐡𝐚𝐭 𝐚𝐫𝐞 𝐍𝐢𝐩𝐚𝐡 𝐯𝐢𝐫𝐮𝐬 𝐬𝐲𝐦𝐩𝐭𝐨𝐦𝐬?
⏱️ Nipah symptoms usually begin within a week - between 3–14 days after exposure.

🔍 Early detection and diagnosis are essential to reduce the risk of death.

𝐇𝐨𝐰 𝐭𝐨 𝐩𝐫𝐨𝐭𝐞𝐜𝐭 𝐲𝐨𝐮𝐫𝐬𝐞𝐥𝐟?
🦠 There is currently no specific medicine or vaccine for Nipah virus in people or animals.

⏱️ Early diagnosis and timely supportive care can greatly improve chances of recovery.

Remember: simple everyday actions can help prevent infection!

12/02/2026

The Cytoskeleton: Framework of the Cell

The cytoskeleton is a dynamic network of protein filaments that provides structure, support, and movement to the cell. It is composed of three main components: microfilaments (actin filaments), intermediate filaments, and microtubules.

Microfilaments help with cell shape and contraction, intermediate filaments provide tensile strength, and microtubules serve as tracks for intracellular transport and chromosome movement during cell division. Together, the cytoskeleton maintains cellular organization and enables processes such as migration and vesicle transport.

03/02/2026

Monitoring the behaviour of transnational corporations is an important public health priority given the many ways corporate actors negatively affect health.

A new Viewpoint discusses how we can improve current standards of behaviour, hold such companies accountable, and improve equitable access to healthy foods, medicines, and vaccines. Find out more via the link in comments 💬

👇 A panel outlining a framework for holistic corporate monitoring.

03/02/2026

AI to predict the risk of cancer metastases

Metastasis remains the leading cause of death in most cancers, particularly colon, breast and lung cancer. Currently, the first detectable sign of the metastatic process is the presence of circulating tumor cells in the blood or in the lymphatic system. By then, it is already too late to prevent their spread. Furthermore, while the mutations that lead to the formation of the original tumors are well understood, no single genetic alteration can explain why, in general, some cells migrate and others do not.

"The difficulty lies in being able to determine the complete molecular identity of a cell – an analysis that destroys it – while observing its function, which requires it to remain alive," explains the senior author. "To this end, we isolated, cloned and cultured tumor cells," adds a co-first author of the study. "These clones were then evaluated in vitro and in a mouse model to observe their ability to migrate through a real biological filter and generate metastases."

The analysis of the expression of several hundred genes, carried out on about thirty clones from two primary colon tumors, identified gene expression gradients closely linked to their migratory potential. In this context, accurate assessment of metastatic potential does not depend on the profile of a single cell, but on the sum of interactions between related cancer cells that form a group.

The gene expression signatures obtained were integrated into an artificial intelligence model developed by the team. "The great novelty of our tool, called 'Mangrove Gene Signatures (MangroveGS)', is that it exploits dozens, even hundreds, of gene signatures. This makes it particularly resistant to individual variations," explains another co-first author of the study. After training, the model achieved an accuracy of nearly 80% in predicting the occurrence of metastases and recurrence of colon cancer, a result far superior to existing tools. In addition, signatures derived from colon cancer can also predict the metastatic potential of other cancers, such as stomach, lung and breast cancer.

After training, the model achieved an accuracy of nearly 80% in predicting the occurrence of metastases and recurrence of colon cancer, a result far superior to existing tools. In addition, signatures derived from colon cancer can also predict the metastatic potential of other cancers, such as stomach, lung and breast cancer.

Thanks to MangroveGS, tumor samples are sufficient: cells can be analysed and their RNA sequenced at the hospital, then the metastatic risk score quickly transmitted to oncologists and patients via an encrypted Mangrove portal that has analysed the anonymised data.

"This information will prevent the overtreatment of low-risk patients, thereby limiting side effects and unnecessary costs, while intensifying the monitoring and treatment of those at high risk," adds the senior author. "It also offers the possibility of optimising the selection of participants in clinical trials, reducing the number of volunteers required, increasing the statistical power of studies, and providing therapeutic benefits to the patients who need it most."

https://sciencemission.com/AI-to-predict-the-risk-of-cancer-metastases

Inventra Medclin Biomedical Healthcare and Research Center

25/02/2026

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